42 changed files with 217 additions and 1698 deletions
--- a/.envrc
+++ b/.envrc
@ -1,2 +0,0 @@
-use nix
-
--- a/.woodpecker/build.yml
+++ b/.woodpecker/build.yml
@ -5,19 +5,28 @@ platform: linux/amd64

 pipeline:
  unitTests:
-    image: "rust:1.65.0"
+    image: "docker.bics.ga/rei_ci/rust-sccache:latest-amd64"
    pull: true
    commands:
      - DEBIAN_FRONTEND=noninteractive apt-get -qq update > /dev/null
      - DEBIAN_FRONTEND=noninteractive apt-get -yqq install pkg-config libssl-dev build-essential libsqlite3-dev > /dev/null
      - cargo build --all
      - cargo test --all
+      - sccache --show-stats
+    environment:
+      RUSTC_WRAPPER: /usr/local/bin/sccache
+      SCCACHE_S3_USE_SSL: "true"
+      SCCACHE_ENDPOINT: "richie.m4.tanukitsu.net:443"
+    secrets:
+      - sccache_bucket
+      - aws_access_key_id
+      - aws_secret_access_key
    when:
      event: [push, pull_request]


  testSuite:
-    image: "rust:1.65.0"
+    image: "docker.bics.ga/rei_ci/rust-sccache:latest-amd64"
    commands:
      - DEBIAN_FRONTEND=noninteractive apt-get -qq update > /dev/null
      - DEBIAN_FRONTEND=noninteractive apt-get -yqq -o=Dpkg::Use-Pty=0 install pkg-config libssl-dev build-essential libsqlite3-dev python3.9 python3.9-venv postgresql postgresql-client mariadb-server mariadb-client zstd lz4 > /dev/null
@ -32,11 +41,20 @@ pipeline:
      - python3.9 -m venv testsuite/.venv
      - ./testsuite/.venv/bin/pip install ./testsuite ./datman-helper-postgres ./datman-helper-mysql
      - cd testsuite && . .venv/bin/activate && TEST_POSTGRES=$(hostname),testsuitedb,root TEST_MYSQL=$(hostname),testsuitemydb,root green
+      - sccache --show-stats
+    environment:
+      RUSTC_WRAPPER: /usr/local/bin/sccache
+      SCCACHE_S3_USE_SSL: "true"
+      SCCACHE_ENDPOINT: "richie.m4.tanukitsu.net:443"
+    secrets:
+      - sccache_bucket
+      - aws_access_key_id
+      - aws_secret_access_key
    when:
      event: [push, pull_request]

  deployManual:
-    image: "docker.emunest.net/rei_ci/mdbook:latest-amd64"
+    image: "docker.bics.ga/rei_ci/mdbook:latest-amd64"
    pull: true
    when:
      branch:
--- a/Cargo.lock
+++ b/Cargo.lock
@ -404,7 +404,7 @@ dependencies = [

 [[package]]
 name = "datman"
-version = "0.6.0-alpha.5"
+version = "0.6.0-alpha.4"
 dependencies = [
 "anyhow",
 "arc-interner",
@ -1733,7 +1733,7 @@ dependencies = [

 [[package]]
 name = "yama"
-version = "0.6.0-alpha.5"
+version = "0.6.0-alpha.4"
 dependencies = [
 "anyhow",
 "blake",
--- a/datman-helper-postgres/datman_helper_postgres/backup.py
+++ b/datman-helper-postgres/datman_helper_postgres/backup.py
@ -39,7 +39,10 @@ def cli():
    # The process (if any) that is our LZ4 decompressor.
    lz4_process = None

-    dump_command = ["pg_dump", database_to_use]
+    dump_command = [
+        "pg_dump",
+        database_to_use
+    ]

    if host_to_use is not None:
        if use_lz4:
@ -60,19 +63,21 @@ def cli():
        # (rather than lz4 covering it).
        command = [
            "ssh",
-            f"{user_to_use}@{host_to_use}"
-            if user_to_use is not None
-            else f"{host_to_use}",
+            f"{user_to_use}@{host_to_use}" if user_to_use is not None else f"{host_to_use}",
            "bash",
            "-o",
            "pipefail",
            "-c",
-            shlex.quote(" ".join(dump_command)),
+            shlex.quote(" ".join(dump_command))
        ]
    elif user_to_use is not None:
        current_username = pwd.getpwuid(os.getuid()).pw_name
        if current_username != user_to_use:
-            command = ["sudo", "-u", user_to_use] + dump_command
+            command = [
+                "sudo",
+                "-u",
+                user_to_use
+            ] + dump_command
        else:
            command = dump_command
    else:
--- a/datman/Cargo.toml
+++ b/datman/Cargo.toml
@ -1,6 +1,6 @@
 [package]
 name = "datman"
-version = "0.6.0-alpha.5"
+version = "0.6.0-alpha.4"
 authors = ["Olivier 'reivilibre' <olivier@librepush.net>"]
 edition = "2021"
 repository = "https://bics.ga/reivilibre/yama"
@ -30,7 +30,7 @@ humansize = "1.1.1"
 chrono = "0.4.19"
 itertools = "0.10.1"
 hostname = "0.3.1"
-yama = { path = "../yama", version = "0.6.0-alpha.5" }
+yama = { path = "../yama", version = "0.6.0-alpha.1" }
 metrics = "0.17.1"
 bare-metrics-recorder = { version = "0.1.0" }
 comfy-table = "6.0.0-rc.1"
--- a/datman/README.md
+++ b/datman/README.md
@ -8,6 +8,5 @@ Features:
 * (optional) Compression using Zstd and a specifiable dictionary
 * (optional) Encryption
 * Ability to back up to remote machines over SSH
-* Labelling of files in a backup source; different destinations can choose to backup either all or a subset of the labels.

 See the documentation for more information.
--- a/datman/src/bin/datman.rs
+++ b/datman/src/bin/datman.rs
@ -28,7 +28,6 @@ use bare_metrics_recorder::recording::BareMetricsRecorderCore;
 use chrono::{DateTime, Local, NaiveDate, NaiveDateTime, TimeZone, Utc};
 use datman::commands::backup::{backup_all_sources_to_destination, backup_source_to_destination};
 use datman::commands::ilabel::interactive_labelling_session;
-use datman::commands::prune::{prune_with_retention_policy, RetentionPolicy};
 use datman::commands::{init_descriptor, pushpull};
 use datman::descriptor::{load_descriptor, SourceDescriptor};
 use datman::get_hostname;
@ -138,13 +137,6 @@ pub enum DatmanCommand {
        pile_name: String,
    },

-    /// Applies a retention policy by removing unnecessary backups.
-    /// Does not reclaim space by itself: use
-    ///   `yama check --apply-gc --shallow`
-    /// & `yama compact`
-    /// to do that.
-    Prune { pile_name: String },
-
    #[clap(name = "_pull_responder_offerer")]
    InternalPullResponderOfferer {
        datman_path: PathBuf,
@ -418,24 +410,6 @@ fn main() -> anyhow::Result<()> {
                Box::new(pbar),
            )?;
        }
-
-        DatmanCommand::Prune { pile_name } => {
-            let descriptor = load_descriptor(Path::new(".")).unwrap();
-            let retention_policy = descriptor
-                .retention
-                .context("No retention policy set in descriptor")?;
-            let dest_desc = &descriptor.piles[&pile_name];
-
-            let pile_desc = load_pile_descriptor(&dest_desc.path)?;
-
-            prune_with_retention_policy(
-                &dest_desc.path,
-                &pile_desc,
-                &RetentionPolicy::from_config(retention_policy),
-                true,
-            )?;
-        }
-
        DatmanCommand::InternalPullResponderOfferer {
            datman_path,
            pile_name,
--- a/datman/src/commands.rs
+++ b/datman/src/commands.rs
@ -20,13 +20,12 @@ use std::fs::File;
 use std::io::Write;
 use std::path::Path;

-use crate::descriptor::{Descriptor, RetentionPolicyConfig, SourceDescriptor};
+use crate::descriptor::{Descriptor, SourceDescriptor};

 pub mod backup;
 pub mod extract;
 pub mod ibrowse;
 pub mod ilabel;
-pub mod prune;
 pub mod pushpull;
 pub mod report;

@ -52,12 +51,6 @@ pub fn init_descriptor(path: &Path) -> anyhow::Result<()> {
        sources: source,
        piles: Default::default(),
        remote_hosts: Default::default(),
-        retention: Some(RetentionPolicyConfig {
-            daily: 14,
-            weekly: 12,
-            monthly: 24,
-            yearly: 9001,
-        }),
    })?;

    datman_toml_file.write_all(&bytes)?;
--- a/datman/src/commands/backup.rs
+++ b/datman/src/commands/backup.rs
@ -17,9 +17,7 @@ along with Yama.  If not, see <https://www.gnu.org/licenses/>.

 use crate::descriptor::{Descriptor, DestPileDescriptor, SourceDescriptor, VirtualSourceKind};
 use crate::get_hostname;
-use crate::labelling::{
-    label_node, load_labelling_rules, str_to_label, Label, LabellingRules, State,
-};
+use crate::labelling::{label_node, load_labelling_rules, str_to_label, Label, State};
 use crate::tree::{scan, FileTree, FileTree1};
 use anyhow::{anyhow, bail};
 use arc_interner::ArcIntern;
@ -78,8 +76,8 @@ pub fn open_stdout_backup_process(
 pub fn label_filter_and_convert(
    tree: FileTree1<()>,
    descriptor: &Descriptor,
+    desc_path: &Path,
    source_name: &str,
-    rules: &LabellingRules,
    dest: &DestPileDescriptor,
 ) -> anyhow::Result<Option<TreeNode>> {
    info!("Labelling.");
@ -89,7 +87,8 @@ pub fn label_filter_and_convert(
        .iter()
        .map(|l| Label(ArcIntern::new(l.clone())))
        .collect();
-    label_node("".to_owned(), None, &mut tree, &labels, rules)?;
+    let rules = load_labelling_rules(desc_path, source_name)?;
+    label_node("".to_owned(), None, &mut tree, &labels, &rules)?;

    let included_labels: HashSet<Label> = dest.included_labels.iter().map(str_to_label).collect();

@ -151,20 +150,16 @@ pub fn backup_source_to_destination<PT: ProgressTracker>(
            cross_filesystems,
        } => {
            info!("Looking to backup {} to {}", source_name, dest_name);
-            let rules = load_labelling_rules(desc_path, source_name)?;
-            let exclusions = rules.get_exclusions_set(directory);
-
            info!("Scanning.");
-            let tree = scan(directory, !*cross_filesystems, &exclusions)?
+            let tree = scan(directory, !*cross_filesystems)?
                .ok_or_else(|| anyhow!("Source does not exist."))?;

            let absolute_source_path = desc_path.join(directory);
            let absolute_dest_path = desc_path.join(&dest.path);
            let pile_descriptor = load_pile_descriptor(&absolute_dest_path)?;
            let pile = open_pile(&absolute_dest_path, &pile_descriptor)?;
-
            let root = if let Some(root) =
-                label_filter_and_convert(tree, descriptor, source_name, &rules, dest)?
+                label_filter_and_convert(tree, descriptor, desc_path, source_name, dest)?
            {
                root
            } else {
--- a/datman/src/commands/ibrowse.rs
+++ b/datman/src/commands/ibrowse.rs
@ -15,7 +15,6 @@ You should have received a copy of the GNU General Public License
 along with Yama.  If not, see <https://www.gnu.org/licenses/>.
 */

-use std::collections::BTreeSet;
 use std::path::Path;

 use anyhow::{anyhow, bail};
@ -81,7 +80,7 @@ pub fn session(path: &Path, source_name: String) -> anyhow::Result<()> {
    };

    println!("Scanning source; this might take a little while...");
-    let mut dir_scan: FileTree1<Option<State>> = scan(directory, one_filesystem, &BTreeSet::new())?
+    let mut dir_scan: FileTree1<Option<State>> = scan(directory, one_filesystem)?
        .ok_or_else(|| anyhow!("Empty source."))?
        .replace_meta(&None);

--- a/datman/src/commands/ilabel.rs
+++ b/datman/src/commands/ilabel.rs
@ -15,7 +15,6 @@ You should have received a copy of the GNU General Public License
 along with Yama.  If not, see <https://www.gnu.org/licenses/>.
 */

-use std::collections::BTreeSet;
 use std::io;
 use std::io::{StdinLock, Stdout, Write};
 use std::path::Path;
@ -193,7 +192,7 @@ pub fn interactive_labelling_session(path: &Path, source_name: String) -> anyhow
        let my_hostname = get_hostname();
        let mut dir_scan = if &my_hostname == hostname {
            info!("Scanning source; this might take a little while...");
-            scan(directory, !*cross_filesystems, &BTreeSet::new())?
+            scan(directory, !*cross_filesystems)?
                .ok_or_else(|| anyhow!("Empty source."))?
                .replace_meta(&None)
        } else {
@ -213,7 +212,6 @@ pub fn interactive_labelling_session(path: &Path, source_name: String) -> anyhow
                &mut write,
                directory.as_ref(),
                !*cross_filesystems,
-                &BTreeSet::new(),
            )?
            .ok_or_else(|| anyhow!("Remote scan failed (does the directory exist?)"))?
            .replace_meta(&None);
--- a/datman/src/commands/prune.rs
+++ b/datman/src/commands/prune.rs
@ -1,220 +0,0 @@
-use crate::commands::backup::split_pointer_name;
-use crate::descriptor::RetentionPolicyConfig;
-use anyhow::{bail, Context};
-use log::info;
-use std::collections::{BTreeMap, BTreeSet};
-use std::io;
-use std::path::Path;
-use yama::commands::open_pile;
-use yama::operations::remove_pointer_safely;
-use yama::pile::PileDescriptor;
-
-pub struct RetentionBand {
-    pub interval_s: u64,
-    pub number_to_retain: u32,
-}
-
-pub struct RetentionPolicy {
-    pub retention_bands: Vec<RetentionBand>,
-}
-
-const DAY: u64 = 86400;
-const WEEK: u64 = 7 * DAY;
-const MONTH: u64 = 31 * DAY;
-const YEAR: u64 = 365 * DAY;
-
-impl RetentionPolicy {
-    pub fn from_config(descriptor: RetentionPolicyConfig) -> RetentionPolicy {
-        let mut policy = RetentionPolicy {
-            retention_bands: vec![],
-        };
-
-        if descriptor.daily != 0 {
-            policy.retention_bands.push(RetentionBand {
-                interval_s: DAY,
-                number_to_retain: descriptor.daily,
-            });
-        }
-
-        if descriptor.weekly != 0 {
-            policy.retention_bands.push(RetentionBand {
-                interval_s: WEEK,
-                number_to_retain: descriptor.weekly,
-            });
-        }
-
-        if descriptor.monthly != 0 {
-            policy.retention_bands.push(RetentionBand {
-                interval_s: MONTH,
-                number_to_retain: descriptor.monthly,
-            });
-        }
-
-        if descriptor.yearly != 0 {
-            policy.retention_bands.push(RetentionBand {
-                interval_s: YEAR,
-                number_to_retain: descriptor.yearly,
-            });
-        }
-
-        policy
-    }
-
-    /// Returns the set of snapshots to remove.
-    pub fn apply_returning_prunable(
-        &self,
-        snapshots_by_unix_time: BTreeMap<u64, String>,
-    ) -> BTreeSet<String> {
-        if snapshots_by_unix_time.is_empty() {
-            return BTreeSet::new();
-        }
-        let mut snapshots_included: BTreeSet<u64> = BTreeSet::new();
-
-        // Always mark the most recent snapshot as retained!
-        let last_snapshot = snapshots_by_unix_time.keys().rev().next().unwrap();
-        snapshots_included.insert(*last_snapshot);
-
-        let now_time = *last_snapshot;
-
-        for band in &self.retention_bands {
-            for multiple in 1..=band.number_to_retain {
-                let target_time = now_time - (multiple as u64) * band.interval_s;
-                if let Some((k, _)) = snapshots_by_unix_time.range(0..=target_time).rev().next() {
-                    snapshots_included.insert(*k);
-                }
-            }
-        }
-
-        // Find all prunable (unincluded) snapshots.
-        snapshots_by_unix_time
-            .into_iter()
-            .filter(|(k, _v)| !snapshots_included.contains(k))
-            .map(|(_k, v)| v)
-            .collect()
-    }
-}
-
-pub fn prune_with_retention_policy(
-    pile_path: &Path,
-    pile_desc: &PileDescriptor,
-    policy: &RetentionPolicy,
-    prompt_first: bool,
-) -> anyhow::Result<()> {
-    let pile = open_pile(&pile_path, &pile_desc).context("Failed to open pile")?;
-
-    let pointers = pile
-        .list_pointers()
-        .context("Failed to list pointers in pile")?;
-
-    let mut pointers_to_keep: BTreeSet<String> = pointers.iter().cloned().collect();
-
-    let pointers_to_remove = get_prunable_pointers(&policy, pointers);
-
-    for remove in &pointers_to_remove {
-        pointers_to_keep.remove(remove);
-    }
-
-    info!("Gory details:\n---\nKeep: {pointers_to_keep:?}\n---\nRemove: {pointers_to_remove:?}");
-    info!(
-        "{} pointers to remove ({} to keep) based on retention policy.",
-        pointers_to_remove.len(),
-        pointers_to_keep.len()
-    );
-
-    if prompt_first {
-        println!("Would you like to proceed? [y/N]: ");
-        let mut buffer = String::new();
-        let stdin = io::stdin(); // We get `Stdin` here.
-        stdin.read_line(&mut buffer)?;
-        if buffer.trim().to_ascii_lowercase() != "y" {
-            bail!("Aborted by user.");
-        }
-    }
-
-    for to_remove in pointers_to_remove {
-        let res = remove_pointer_safely(&pile, &to_remove).context("removing prunable pointers");
-
-        pile.flush()
-            .context("flushing pile after removing pointers")?;
-
-        res?;
-    }
-
-    Ok(())
-}
-
-fn get_prunable_pointers(policy: &RetentionPolicy, pointers: Vec<String>) -> BTreeSet<String> {
-    let mut split_pointers_by_name: BTreeMap<String, BTreeMap<u64, String>> = BTreeMap::new();
-
-    for pointer in pointers {
-        let (name, datetime) = if let Some(x) = split_pointer_name(&pointer) {
-            x
-        } else {
-            continue;
-        };
-
-        split_pointers_by_name
-            .entry(name)
-            .or_default()
-            .insert(datetime.timestamp().try_into().unwrap(), pointer);
-    }
-
-    let mut pointers_to_remove = BTreeSet::new();
-
-    for (_pointer_base_name, ts_to_pointer) in split_pointers_by_name {
-        let to_remove = policy.apply_returning_prunable(ts_to_pointer);
-
-        pointers_to_remove.extend(to_remove);
-    }
-
-    pointers_to_remove
-}
-
-#[cfg(test)]
-mod test {
-    use crate::commands::prune::{get_prunable_pointers, RetentionPolicy};
-    use crate::descriptor::RetentionPolicyConfig;
-
-    #[test]
-    fn test_prunable_pointers() {
-        let pointers = vec![
-            "alice+2022-09-28_05:00:00",
-            "alice+2022-09-28_02:00:00",
-            "alice+2022-09-21_05:00:00",
-            "alice+2022-09-14_05:00:00",
-            "alice+2022-09-08_05:00:00",
-            "alice+2022-09-07_05:00:00",
-            "alice+2022-09-01_05:00:00",
-            "bob+2022-09-28_06:00:00",
-            "bob+2022-09-28_03:00:00",
-            "bob+2022-09-21_06:00:00",
-            "bob+2022-09-14_06:00:00",
-            "bob+2022-09-08_06:00:00",
-            "bob+2022-09-07_06:00:00",
-            "bob+2022-09-01_06:00:00",
-        ]
-        .into_iter()
-        .map(|s| s.to_owned())
-        .collect();
-        let policy = RetentionPolicy::from_config(RetentionPolicyConfig {
-            daily: 0,
-            weekly: 3,
-            monthly: 0,
-            yearly: 0,
-        });
-
-        assert_eq!(
-            get_prunable_pointers(&policy, pointers)
-                .into_iter()
-                .collect::<Vec<_>>(),
-            vec![
-                "alice+2022-09-01_05:00:00",
-                "alice+2022-09-08_05:00:00",
-                "alice+2022-09-28_02:00:00",
-                "bob+2022-09-01_06:00:00",
-                "bob+2022-09-08_06:00:00",
-                "bob+2022-09-28_03:00:00",
-            ]
-        );
-    }
-}
--- a/datman/src/commands/pushpull.rs
+++ b/datman/src/commands/pushpull.rs
@ -1,11 +1,9 @@
 // Push and Pull support for Datman

 use anyhow::{bail, ensure, Context};
-use log::info;
 use std::collections::{BTreeMap, BTreeSet};
 use std::io::{Read, Write};
 use std::sync::Arc;
-use std::time::Instant;
 use yama::chunking::RecursiveUnchunker;
 use yama::commands::retrieve_tree_node;
 use yama::definitions::{ChunkId, PointerData, RecursiveChunkRef, TreeNode};
@ -185,25 +183,9 @@ pub fn offering_side<R: Read, W: Write>(
    drop(chunks_to_offer);
    drop(chunks_to_skip);

-    let start_sort_by_hints = Instant::now();
-    let chunks_to_send_with_hints: BTreeSet<(u64, ChunkId)> = chunks_to_send
-        .into_iter()
-        .map(|chunk_id| {
-            pile.raw_pile
-                .chunk_id_transfer_ordering_hint(&chunk_id)
-                .map(|hint| (hint, chunk_id))
-        })
-        .collect::<anyhow::Result<_>>()?;
-    let time_to_sort_by_hints = Instant::now() - start_sort_by_hints;
-    info!(
-        "{} s to sort {} chunks by their hints",
-        time_to_sort_by_hints.as_secs_f32(),
-        chunks_to_send_with_hints.len()
-    );
-
-    progress.set_max_size(chunks_to_send_with_hints.len() as u64);
+    progress.set_max_size(chunks_to_send.len() as u64);
    progress.set_current(0);
-    for (_hint, chunk_id) in chunks_to_send_with_hints {
+    for chunk_id in chunks_to_send {
        let chunk_data = bypass_pile
            .read(Keyspace::Chunk, &chunk_id)?
            .context("Chunk vanished")?;
--- a/datman/src/descriptor.rs
+++ b/datman/src/descriptor.rs
@ -38,10 +38,6 @@ pub struct Descriptor {
    pub piles: HashMap<String, DestPileDescriptor>,

    pub remote_hosts: HashMap<String, RemoteHostDescriptor>,
-
-    #[serde(default)]
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub retention: Option<RetentionPolicyConfig>,
 }

 #[derive(Clone, Serialize, Deserialize, Debug)]
@ -50,14 +46,6 @@ pub struct RemoteHostDescriptor {
    pub path_to_datman: Option<String>,
 }

-#[derive(Clone, Serialize, Deserialize, Debug)]
-pub struct RetentionPolicyConfig {
-    pub daily: u32,
-    pub weekly: u32,
-    pub monthly: u32,
-    pub yearly: u32,
-}
-
 #[derive(Clone, Serialize, Deserialize, Debug)]
 #[serde(untagged)]
 pub enum SourceDescriptor {
--- a/datman/src/labelling.rs
+++ b/datman/src/labelling.rs
@ -15,10 +15,10 @@ You should have received a copy of the GNU General Public License
 along with Yama.  If not, see <https://www.gnu.org/licenses/>.
 */

-use std::collections::{BTreeSet, HashMap};
+use std::collections::HashMap;
 use std::fs::File;
 use std::io::{BufRead, BufReader, Write};
-use std::path::{Path, PathBuf};
+use std::path::Path;

 use anyhow::anyhow;
 use anyhow::Context;
@ -222,23 +222,6 @@ impl LabellingRules {
        }
        None
    }
-
-    pub fn get_exclusions_set(&self, base: &Path) -> BTreeSet<PathBuf> {
-        let mut exclusions = BTreeSet::new();
-
-        for (ext_path, state) in &self.position_based_rules {
-            assert!(ext_path.is_empty() || ext_path.starts_with('/'));
-            let full_path = PathBuf::from(format!(
-                "{}{ext_path}",
-                base.to_str().expect("base path must always be utf-8")
-            ));
-            if state == &Excluded {
-                exclusions.insert(full_path);
-            }
-        }
-
-        exclusions
-    }
 }

 /// Uninteractively label the nodes.
--- a/datman/src/remote/backup_source_requester.rs
+++ b/datman/src/remote/backup_source_requester.rs
@ -1,13 +1,11 @@
 use crate::commands::backup::{get_pointer_name_at, label_filter_and_convert};
 use crate::descriptor::{Descriptor, DestPileDescriptor, SourceDescriptor};
-use crate::labelling::load_labelling_rules;
 use crate::tree::FileTree;
 use anyhow::{anyhow, bail};
 use chrono::Utc;
 use log::info;
-use std::collections::BTreeSet;
 use std::io::{Read, Write};
-use std::path::{Path, PathBuf};
+use std::path::Path;
 use std::process::{Child, Command, Stdio};
 use std::sync::Arc;
 use yama::commands::{load_pile_descriptor, open_pile};
@ -50,13 +48,11 @@ pub fn scanning<R: Read, W: Write>(
    write: &mut W,
    path: &Path,
    one_filesystem: bool,
-    exclusions: &BTreeSet<PathBuf>,
 ) -> anyhow::Result<Option<FileTree<(), (), (), ()>>> {
    info!("Scanning.");
    write_message(write, &"scan")?;
    write_message(write, &path)?;
    write_message(write, &one_filesystem)?;
-    write_message(write, exclusions)?;
    write.flush()?;
    let scan_result: Option<FileTree<(), (), (), ()>> = read_message(read)?;

@ -203,9 +199,6 @@ pub fn backup_remote_source_to_destination<PT: ProgressTracker + Send + 'static>
            info!("Connecting...");
            introduction(&mut read, &mut write)?;

-            let rules = load_labelling_rules(desc_path, source_name)?;
-            let exclusions = rules.get_exclusions_set(directory);
-
            // then request to scan
            info!("Requesting scan... (this may take some time)");
            let scan_result = scanning(
@ -213,12 +206,11 @@ pub fn backup_remote_source_to_destination<PT: ProgressTracker + Send + 'static>
                &mut write,
                directory.as_ref(),
                !*cross_filesystems,
-                &exclusions,
            )?
            .ok_or_else(|| anyhow!("Remote scan failed (does the directory exist?)"))?;

            let mut root =
-                label_filter_and_convert(scan_result, descriptor, source_name, &rules, dest)?
+                label_filter_and_convert(scan_result, descriptor, desc_path, source_name, dest)?
                    .ok_or_else(|| anyhow!("Empty filter..."))?;

            let absolute_dest_path = desc_path.join(&dest.path);
--- a/datman/src/remote/backup_source_responder.rs
+++ b/datman/src/remote/backup_source_responder.rs
@ -1,7 +1,6 @@
 // This file implements the responder side of the backup source protocol -- the protocol used
 // to connect to remote backup sources.

-use std::collections::BTreeSet;
 use std::io::{stdin, stdout, Read, Write};
 use std::path::PathBuf;
 use std::sync::Arc;
@ -44,8 +43,7 @@ pub fn introduction<R: Read, W: Write>(read: &mut R, write: &mut W) -> anyhow::R
 pub fn scanning<R: Read, W: Write>(read: &mut R, write: &mut W) -> anyhow::Result<()> {
    let path: PathBuf = read_message(read)?;
    let one_filesystem: bool = read_message(read)?;
-    let exclusions: BTreeSet<PathBuf> = read_message(read)?;
-    let scan_result = scan(&path, one_filesystem, &exclusions)?;
+    let scan_result = scan(&path, one_filesystem)?;
    write_message(write, &scan_result)?;
    write.flush()?;
    Ok(())
--- a/datman/src/tree.rs
+++ b/datman/src/tree.rs
@ -15,16 +15,16 @@ You should have received a copy of the GNU General Public License
 along with Yama.  If not, see <https://www.gnu.org/licenses/>.
 */

-use std::collections::{BTreeMap, BTreeSet};
+use std::collections::BTreeMap;
 use std::fmt::Debug;
 use std::fs::{read_link, symlink_metadata, DirEntry, Metadata};
 use std::io::ErrorKind;
 use std::os::unix::fs::MetadataExt;
-use std::path::{Path, PathBuf};
+use std::path::Path;

 use anyhow::anyhow;
 use indicatif::{ProgressBar, ProgressDrawTarget, ProgressStyle};
-use log::{debug, info, warn};
+use log::{info, warn};
 use serde::{Deserialize, Serialize};

 pub use yama::definitions::FilesystemOwnership;
@ -216,18 +216,14 @@ pub fn mtime_msec(metadata: &Metadata) -> u64 {
 }

 /// Scan the filesystem to produce a Tree, using a default progress bar.
-pub fn scan(
-    path: &Path,
-    one_filesystem: bool,
-    exclusions: &BTreeSet<PathBuf>,
-) -> anyhow::Result<Option<FileTree<(), (), (), ()>>> {
+pub fn scan(path: &Path, one_filesystem: bool) -> anyhow::Result<Option<FileTree<(), (), (), ()>>> {
    let pbar = ProgressBar::with_draw_target(0, ProgressDrawTarget::stdout_with_hz(2));
    pbar.set_style(ProgressStyle::default_spinner().template("{spinner} {pos:7} {msg}"));
    pbar.set_message("dir scan");

    let one_filesystem = if one_filesystem { Some(None) } else { None };

-    let result = scan_with_progress_bar(path, &pbar, one_filesystem, exclusions);
+    let result = scan_with_progress_bar(path, &pbar, one_filesystem);
    pbar.finish_at_current_pos();
    result
 }
@ -237,14 +233,7 @@ pub fn scan_with_progress_bar(
    path: &Path,
    progress_bar: &ProgressBar,
    mut one_filesystem: Option<Option<u64>>,
-    exclusions: &BTreeSet<PathBuf>,
 ) -> anyhow::Result<Option<FileTree<(), (), (), ()>>> {
-    if exclusions.contains(path) {
-        // Don't enter excluded paths.
-        debug!("Not descending into excluded path: {:?}", path);
-        return Ok(None);
-    }
-
    let metadata_res = symlink_metadata(path);
    progress_bar.inc(1);
    if let Err(e) = &metadata_res {
@ -316,17 +305,7 @@ pub fn scan_with_progress_bar(

        for entry in dir_read? {
            let entry: DirEntry = entry?;
-
-            if entry.file_name() == ".datmanskip" {
-                // Directories with .datmanskip in them are to be skipped entirely.
-                // TODO(perf): should this be checked upfront before some children may already
-                //     have been scanned?
-                debug!("Skipping {path:?} because it has a .datmanskip file.");
-                return Ok(None);
-            }
-
-            let scanned =
-                scan_with_progress_bar(&entry.path(), progress_bar, one_filesystem, exclusions)?;
+            let scanned = scan_with_progress_bar(&entry.path(), progress_bar, one_filesystem)?;
            if let Some(scanned) = scanned {
                if let Ok(filename) = entry.file_name().into_string() {
                    children.insert(filename, scanned);
--- a/flake.lock
+++ b/flake.lock
@ -1,15 +1,12 @@
 {
  "nodes": {
    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "lastModified": 1653893745,
+        "narHash": "sha256-0jntwV3Z8//YwuOjzhV2sgJJPt+HY6KhU7VZUL0fKZQ=",
        "owner": "numtide",
        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "rev": "1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1",
        "type": "github"
      },
      "original": {
@ -20,16 +17,14 @@
    },
    "naersk": {
      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": "nixpkgs"
      },
      "locked": {
-        "lastModified": 1662220400,
-        "narHash": "sha256-9o2OGQqu4xyLZP9K6kNe1pTHnyPz0Wr3raGYnr9AIgY=",
+        "lastModified": 1653413650,
+        "narHash": "sha256-wojDHjb+eU80MPH+3HQaK0liUy8EgR95rvmCl24i58Y=",
        "owner": "nix-community",
        "repo": "naersk",
-        "rev": "6944160c19cb591eb85bbf9b2f2768a935623ed3",
+        "rev": "69daaceebe12c070cd5ae69ba38f277bbf033695",
        "type": "github"
      },
      "original": {
@ -38,58 +33,60 @@
        "type": "github"
      }
    },
-    "nix-github-actions": {
-      "inputs": {
-        "nixpkgs": [
-          "poetry2nix",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1703863825,
-        "narHash": "sha256-rXwqjtwiGKJheXB43ybM8NwWB8rO2dSRrEqes0S7F5Y=",
-        "owner": "nix-community",
-        "repo": "nix-github-actions",
-        "rev": "5163432afc817cf8bd1f031418d1869e4c9d5547",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nix-github-actions",
-        "type": "github"
-      }
-    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1714971268,
-        "narHash": "sha256-IKwMSwHj9+ec660l+I4tki/1NRoeGpyA2GdtdYpAgEw=",
+        "lastModified": 1653738054,
+        "narHash": "sha256-IaR8iLN4Ms3f5EjU1CJkXSc49ZzyS5qv03DtVAti6/s=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "27c13997bf450a01219899f5a83bd6ffbfc70d3c",
+        "rev": "17b62c338f2a0862a58bb6951556beecd98ccda9",
        "type": "github"
      },
      "original": {
        "id": "nixpkgs",
-        "ref": "nixos-23.11",
        "type": "indirect"
      }
    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1653738054,
+        "narHash": "sha256-IaR8iLN4Ms3f5EjU1CJkXSc49ZzyS5qv03DtVAti6/s=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "17b62c338f2a0862a58bb6951556beecd98ccda9",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1654176133,
+        "narHash": "sha256-XhjUlU+q9LPFM8Z7X3h504vS2FUToCyKhaf5hVF6nsw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "63f15db5291aec276924d907d3e083e74d68e8b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
    "poetry2nix": {
      "inputs": {
        "flake-utils": "flake-utils",
-        "nix-github-actions": "nix-github-actions",
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "systems": "systems_2",
-        "treefmt-nix": "treefmt-nix"
+        "nixpkgs": "nixpkgs_3"
      },
      "locked": {
-        "lastModified": 1715017507,
-        "narHash": "sha256-RN2Vsba56PfX02DunWcZYkMLsipp928h+LVAWMYmbZg=",
+        "lastModified": 1653561148,
+        "narHash": "sha256-JzAttqACdvMOTwkzkJ0jFF8MWIo8Uau4w/XUMyqpnd8=",
        "owner": "nix-community",
        "repo": "poetry2nix",
-        "rev": "e6b36523407ae6a7a4dfe29770c30b3a3563b43a",
+        "rev": "3b01c3e3dc57d511848d8433153ab67db79640e1",
        "type": "github"
      },
      "original": {
@ -101,68 +98,18 @@
    "root": {
      "inputs": {
        "naersk": "naersk",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs_2",
        "poetry2nix": "poetry2nix",
        "utils": "utils"
      }
    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "id": "systems",
-        "type": "indirect"
-      }
-    },
-    "treefmt-nix": {
-      "inputs": {
-        "nixpkgs": [
-          "poetry2nix",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1714058656,
-        "narHash": "sha256-Qv4RBm4LKuO4fNOfx9wl40W2rBbv5u5m+whxRYUMiaA=",
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "rev": "c6aaf729f34a36c445618580a9f95a48f5e4e03f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "type": "github"
-      }
-    },
    "utils": {
      "locked": {
-        "lastModified": 1659877975,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "lastModified": 1652776076,
+        "narHash": "sha256-gzTw/v1vj4dOVbpBSJX4J0DwUR6LIyXo7/SuuTJp1kM=",
        "owner": "numtide",
        "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "rev": "04c1b180862888302ddfb2e3ad9eaa63afc60cf8",
        "type": "github"
      },
      "original": {
--- a/flake.nix
+++ b/flake.nix
@ -3,21 +3,13 @@

  inputs = {
    utils.url = "github:numtide/flake-utils";
-    naersk = {
-      url = "github:nix-community/naersk";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-    nixpkgs.url = "nixpkgs/nixos-23.11";
-    poetry2nix = {
-      url = "github:nix-community/poetry2nix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
+    naersk.url = "github:nix-community/naersk";
+    poetry2nix.url = "github:nix-community/poetry2nix";
  };

  outputs = { self, nixpkgs, utils, naersk, poetry2nix }:
    utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages."${system}";
-      inherit (poetry2nix.lib.mkPoetry2Nix { inherit pkgs; }) mkPoetryApplication;
      naersk-lib = naersk.lib."${system}";

      rustComponents = naersk-lib.buildPackage {
@ -26,16 +18,16 @@

        buildInputs = with pkgs; [
          openssl
-          pkg-config
+          pkgconfig
          sqlite
        ];
      };

-      mysqlHelper = mkPoetryApplication {
+      mysqlHelper = pkgs.poetry2nix.mkPoetryApplication {
        projectDir = ./datman-helper-mysql;
      };

-      postgresHelper = mkPoetryApplication {
+      postgresHelper = pkgs.poetry2nix.mkPoetryApplication {
        projectDir = ./datman-helper-postgres;
      };

--- a/scripts-dev/lint.sh
+++ b/scripts-dev/lint.sh
@ -4,7 +4,7 @@ if [ $# -ge 1 ]
 then
  files=$*
 else
-  files="testsuite/setup.py testsuite/datmantests testsuite/helpers testsuite/yamatests datman-helper-postgres/datman_helper_postgres datman-helper-mysql/datman_helper_mysql"
+  files="testsuite/setup.py testsuite/datmantests testsuite/helpers testsuite/yamatests datman-helper-postgres/datman_helper_postgres datman-helper-postgres/setup.py datman-helper-mysql/datman_helper_mysql datman-helper-mysql/setup.py"
 fi

 echo "Linting these locations: $files"
--- a/shell.nix
+++ b/shell.nix
@ -1,50 +0,0 @@
-{ pkgs ? import <nixpkgs> {} }:
-
-let
-  # We may need some packages from nixpkgs-unstable
-  #unstable = import <nixpkgs-unstable> {};
-
-  rust-toolchain = pkgs.symlinkJoin {
-    name = "rust-toolchain";
-    paths = [pkgs.rustc pkgs.cargo pkgs.rustfmt pkgs.rustPlatform.rustcSrc];
-  };
-in
-
-pkgs.mkShell {
-
-  buildInputs = [
-    rust-toolchain
-
-    pkgs.pkg-config
-
-    pkgs.alsa-lib
-    pkgs.sqlite
-    #pkgs.libclang # ??
-  ];
-
-  nativeBuildInputs = [
-    pkgs.openssl
-    pkgs.python3
-  ];
-
-  # Needed for bindgen when binding to avahi
-  LIBCLANG_PATH="${pkgs.llvmPackages_latest.libclang.lib}/lib";
-
-  # Cargo culted:
-  # Add to rustc search path
-  RUSTFLAGS = (builtins.map (a: ''-L ${a}/lib'') [
-  ]);
-  # Add to bindgen search path
-  BINDGEN_EXTRA_CLANG_ARGS =
-    # Includes with normal include path
-    (builtins.map (a: ''-I"${a}/include"'') [
-    ])
-    # Includes with special directory paths
-    ++ [
-      ''-I"${pkgs.llvmPackages_latest.libclang.lib}/lib/clang/${pkgs.llvmPackages_latest.libclang.version}/include"''
-      #''-I"${pkgs.glib.dev}/include/glib-2.0"''
-      #''-I${pkgs.glib.out}/lib/glib-2.0/include/''
-    ];
-
-
-}
--- a/testsuite/datmantests/test_backup_and_extract.py
+++ b/testsuite/datmantests/test_backup_and_extract.py
@ -251,8 +251,7 @@ kind = {{ stdout = "blahblah.txt" }}
        seed = 7555
        print(f"seed: {seed}")
        rng.seed(seed)
-        # min_files is 8 because we need enough files to use each label for this
-        # test to succeed.
+        # min_files is 8 because we need enough files to use each label for this test to succeed.
        initial_descriptor, _ = generate_random_dir(rng, src_path, 32, min_files=8)
        labellings = generate_labels(initial_descriptor, rng)
        save_labelling_rules(labelling_path.joinpath("srca.zst"), labellings)
@ -299,81 +298,3 @@ kind = {{ stdout = "blahblah.txt" }}
            )

        td.cleanup()
-
-    def test_backup_incremental_with_mid_delete(self):
-        td = TemporaryDirectory("test_backup_incremental_with_mid_delete")
-        tdpath = Path(td.name)
-
-        datman_path = tdpath.joinpath("datman")
-        src_path = datman_path.joinpath("srca")
-        yama_path = datman_path.joinpath("main")
-
-        set_up_simple_datman(datman_path)
-        set_up_simple_yama(yama_path)
-
-        rng = Random()
-        seed = rng.randint(0, 9001)
-        print(f"seed: {seed}")
-        rng.seed(seed)
-        initial_descriptor, _ = generate_random_dir(rng, src_path, 32)
-
-        print("storing")
-        subprocess.check_call(("datman", "backup-one", "srca", "main"), cwd=datman_path)
-
-        # now mutate and store incremental
-        randomly_mutate_directory_in_descriptor(initial_descriptor, src_path, rng)
-        time.sleep(2)
-        subprocess.check_call(("datman", "backup-one", "srca", "main"), cwd=datman_path)
-
-        # now mutate and store incremental again!
-        randomly_mutate_directory_in_descriptor(initial_descriptor, src_path, rng)
-        mutated_descriptor = scan_dir(src_path)
-        time.sleep(2)
-        subprocess.check_call(("datman", "backup-one", "srca", "main"), cwd=datman_path)
-
-        pointer_names = [
-            line
-            for line in subprocess.check_output(("yama", "debug", "lsp"), cwd=yama_path)
-            .decode()
-            .split("\n")
-            if line
-        ]
-        self.assertEqual(len(pointer_names), 3)
-        self.assertLess(pointer_names[0], pointer_names[1])
-        self.assertLess(pointer_names[1], pointer_names[2])
-
-        print(f"removing mid pointer {pointer_names[1]}")
-        subprocess.check_call(
-            ("yama", "debug", "rmp", pointer_names[1]),
-            cwd=yama_path,
-        )
-
-        print("extracting last pointer to check still valid")
-        dest_path = tdpath.joinpath("desta")
-        subprocess.check_call(
-            (
-                "datman",
-                "extract",
-                "--skip-metadata",
-                "--accept-partial",
-                "main",
-                "../desta",
-            ),
-            cwd=datman_path,
-        )
-
-        # this will be wrapped in a directory that starts with the name srca+
-        extracted_dir_descriptor_wrapper = scan_dir(dest_path)
-
-        contents = extracted_dir_descriptor_wrapper.contents
-        self.assertEqual(len(contents), 1)
-        key, value = next(iter(contents.items()))
-        self.assertTrue(key.startswith("srca+"))
-
-        self.assertIsInstance(value, DirectoryDescriptor)
-        key, value = next(iter(value.contents.items()))
-        self.assertEqual(key, "srca")
-
-        self.assertEqual(value.ignore_metadata(), mutated_descriptor.ignore_metadata())
-
-        td.cleanup()
--- a/testsuite/helpers/yama_helpers.py
+++ b/testsuite/helpers/yama_helpers.py
@ -1,7 +1,6 @@
 import shutil
 import subprocess
 from pathlib import Path
-from typing import Set


 def set_up_simple_yama(path: Path):
@ -11,13 +10,3 @@ def set_up_simple_yama(path: Path):
        "example_zstd.dict"
    )
    shutil.copyfile(example_zstd_path, path.joinpath("important_zstd.dict"))
-
-
-def list_bloblog_ids(pile: Path) -> Set[int]:
-    result = set()
-    for p in pile.joinpath("bloblog").iterdir():
-        try:
-            result.add(int(p.name))
-        except ValueError:
-            pass
-    return result
--- a/testsuite/setup.py
+++ b/testsuite/setup.py
@ -22,7 +22,7 @@ REQUIRED = ["green", "attrs", "immutabledict"]


 # What packages are optional?
-EXTRAS = {"dev": ["black==22.10.0", "flake8==3.9.2", "isort==5.9.2"]}
+EXTRAS = {"dev": ["black==21.7b0", "flake8==3.9.2", "isort==5.9.2"]}

 # The rest you shouldn't have to touch too much :)
 # ------------------------------------------------
--- a/testsuite/yamatests/test_compact.py
+++ b/testsuite/yamatests/test_compact.py
@ -1,175 +0,0 @@
-import subprocess
-from pathlib import Path
-from random import Random
-from tempfile import TemporaryDirectory
-from unittest import TestCase
-
-from helpers import (
-    DirectoryDescriptor,
-    generate_random_dir,
-    randomly_mutate_directory_in_descriptor,
-    scan_dir,
-)
-from helpers.datman_helpers import set_up_simple_datman
-from helpers.yama_helpers import list_bloblog_ids, set_up_simple_yama
-
-
-class TestYamaCompact(TestCase):
-    def test_compaction_merge_two_small_bloblogs(self):
-        td = TemporaryDirectory("test_check_fails_after_random_corruption")
-        tdpath = Path(td.name)
-
-        datman_path = tdpath.joinpath("datman")
-        src_path = datman_path.joinpath("srca")
-        yama_path = datman_path.joinpath("main")
-
-        set_up_simple_datman(datman_path)
-        set_up_simple_yama(yama_path)
-
-        rng = Random()
-        seed = rng.randint(0, 9001)
-        print(f"seed: {seed}")
-        rng.seed(seed)
-        later_expected_descriptor, _ = generate_random_dir(rng, src_path, 32)
-
-        # Back up twice: that way we should get at least two bloblogs!
-        subprocess.check_call(("datman", "backup-one", "srca", "main"), cwd=datman_path)
-        subprocess.check_call(("datman", "backup-one", "srca", "main"), cwd=datman_path)
-        old_bloblog_ids = list_bloblog_ids(yama_path)
-        self.assertGreater(
-            len(old_bloblog_ids), 1, "Should be many bloblogs at this point"
-        )
-
-        subprocess.check_call(
-            (
-                "yama",
-                "compact",
-                "--mergeable",
-                "2",
-                "--small",
-                str(2 * 1024 * 1024 * 1024),
-            ),
-            cwd=yama_path,
-        )
-
-        new_bloblog_ids = list_bloblog_ids(yama_path)
-        self.assertEqual(
-            len(new_bloblog_ids), 1, "Should only be 1 bloblog at this point."
-        )
-        self.assertEqual(
-            list(new_bloblog_ids)[0],
-            max(old_bloblog_ids) + 1,
-            "New bloblog ID should be 1 greater than the max old one.",
-        )
-
-    def test_gc_then_compact(self):
-        td = TemporaryDirectory("test_gc_then_compact")
-        tdpath = Path(td.name)
-
-        datman_path = tdpath.joinpath("datman")
-        src_path = datman_path.joinpath("srca")
-        yama_path = datman_path.joinpath("main")
-
-        set_up_simple_datman(datman_path)
-        set_up_simple_yama(yama_path)
-
-        rng = Random()
-        seed = rng.randint(0, 9001)
-        print(f"seed: {seed}")
-        rng.seed(seed)
-        initial_descriptor, _ = generate_random_dir(rng, src_path, 32)
-
-        subprocess.check_call(("datman", "backup-one", "srca", "main"), cwd=datman_path)
-        orig_pointer_name = (
-            subprocess.check_output(("yama", "debug", "lsp"), cwd=yama_path)
-            .decode()
-            .split("\n")[0]
-        )
-
-        randomly_mutate_directory_in_descriptor(initial_descriptor, src_path, rng)
-        mutated_descriptor = scan_dir(src_path)
-
-        subprocess.check_call(("datman", "backup-one", "srca", "main"), cwd=datman_path)
-
-        old_bloblog_ids = list_bloblog_ids(yama_path)
-
-        # Try a GC and check that it's a no-op
-        subprocess.check_call(
-            ("yama", "check", "--shallow", "--apply-gc"), cwd=yama_path
-        )
-        subprocess.check_call(
-            (
-                "yama",
-                "compact",
-                "--mergeable",
-                "2000",
-                "--reclaim",
-                "1",
-                "--max-dealloc",
-                "1",
-            ),
-            cwd=yama_path,
-        )
-
-        unchanged_bloblog_ids = list_bloblog_ids(yama_path)
-        self.assertEqual(
-            old_bloblog_ids,
-            unchanged_bloblog_ids,
-            "No GC: no compaction should have happened.",
-        )
-
-        subprocess.check_call(
-            ("yama", "debug", "rmp", orig_pointer_name), cwd=yama_path
-        )
-
-        # Try a GC and check that it did something
-        subprocess.check_call(
-            ("yama", "check", "--shallow", "--apply-gc"), cwd=yama_path
-        )
-        subprocess.check_call(
-            (
-                "yama",
-                "compact",
-                "--mergeable",
-                "2000",
-                "--reclaim",
-                "1",
-                "--max-dealloc",
-                "1",
-            ),
-            cwd=yama_path,
-        )
-
-        new_bloblog_ids = list_bloblog_ids(yama_path)
-        self.assertNotEqual(
-            old_bloblog_ids, new_bloblog_ids, "GC: compaction should have happened."
-        )
-
-        # Check that we can still extract the files!
-        dest_path = tdpath.joinpath("desta")
-        subprocess.check_call(
-            (
-                "datman",
-                "extract",
-                "--skip-metadata",
-                "--accept-partial",
-                "main",
-                "../desta",
-            ),
-            cwd=datman_path,
-        )
-
-        extracted_dir_descriptor_wrapper = scan_dir(dest_path)
-
-        contents = extracted_dir_descriptor_wrapper.contents
-        self.assertEqual(len(contents), 1)
-        key, value = next(iter(contents.items()))
-        self.assertTrue(key.startswith("srca+"))
-
-        self.assertIsInstance(value, DirectoryDescriptor)
-        key, value = next(iter(value.contents.items()))
-        self.assertEqual(key, "srca")
-
-        self.assertEqual(value.ignore_metadata(), mutated_descriptor.ignore_metadata())
-
-        td.cleanup()
--- a/yama/Cargo.toml
+++ b/yama/Cargo.toml
@ -1,6 +1,6 @@
 [package]
 name = "yama"
-version = "0.6.0-alpha.5"
+version = "0.6.0-alpha.4"
 authors = ["Olivier 'reivilibre' <olivier@librepush.net>"]
 edition = "2018"
 description = "Deduplicated, compressed and encrypted content pile manager"
--- a/yama/src/bin/yama.rs
+++ b/yama/src/bin/yama.rs
@ -29,8 +29,7 @@ use yama::operations::checking::VacuumMode;
 use yama::operations::legacy_pushpull::{
    determine_bypass_level, open_pile_with_work_bypass, push_to,
 };
-use yama::operations::{checking, cleanup, extracting};
-use yama::pile::local_sqlitebloblogs::CompactionThresholds;
+use yama::operations::{checking, extracting};
 use yama::pile::{Pile, PileDescriptor, RawPile};
 use yama::{commands, debug};

@ -57,9 +56,8 @@ enum PileCommand {
        pointer_name: String,

        /// Limited expression(s) of files to retrieve.
-        /// LIMITATION OF CURRENT VERSION: ONLY ONE EXACT PATH ALLOWED, PLEASE.
        #[clap(short, long)]
-        subset: Option<String>,
+        subset: Vec<PathBuf>,

        destination: PathBuf,

@ -84,29 +82,6 @@ enum PileCommand {
        shallow: bool,
    },

-    Compact {
-        /// Don't actually perform any compaction; just plan it out.
-        #[clap(long)]
-        dry_run: bool,
-
-        /// Allocated size under which a bloblog is considered small.
-        #[clap(long = "small")]
-        small_thresh: Option<u64>,
-
-        /// Minimum amount of space to reclaim in order to run compaction for reclaim.
-        #[clap(long = "reclaim")]
-        min_reclaim: Option<u64>,
-
-        /// Maximum amount of space that can be deallocated in a bloblog before we consider it
-        /// worthwhile to replace.
-        #[clap(long = "max-dealloc")]
-        max_deallocated: Option<u64>,
-
-        /// Minimum number of mergeable small bloblogs in order to run compaction for merge.
-        #[clap(long)]
-        mergeable: Option<u32>,
-    },
-
    /// Enter a debug prompt for manually operating on the yama pile.
    Debug { supplied_command: Vec<String> },

@ -143,7 +118,7 @@ fn wrapped_main() -> anyhow::Result<i32> {
    match &opts.command {
        PileCommand::Retrieve {
            pointer_name,
-            subset,
+            subset: _,
            destination,
            num_workers: workers,
        } => {
@ -161,25 +136,10 @@ fn wrapped_main() -> anyhow::Result<i32> {

            fully_integrate_pointer_node(&pile, &mut root_tree_node.node, &mut pointer)?;

-            let mut node_to_extract = &mut root_tree_node.node;
-
-            if let Some(subset) = subset {
-                for path_to_descend in subset.split('/').filter(|s| !s.is_empty()) {
-                    match node_to_extract.child(path_to_descend) {
-                        Ok(new_node) => {
-                            node_to_extract = new_node;
-                        }
-                        Err(msg) => {
-                            bail!("Can't descend into {path_to_descend:?}: {msg}");
-                        }
-                    }
-                }
-            }
-
            // todo allow disabling apply metadata
            extracting::extract(
                destination,
-                node_to_extract,
+                &mut root_tree_node.node,
                &pile,
                true,
                workers.unwrap_or(2),
@ -215,29 +175,6 @@ fn wrapped_main() -> anyhow::Result<i32> {
                return Ok(1);
            }
        }
-        PileCommand::Compact {
-            dry_run,
-            small_thresh,
-            min_reclaim,
-            max_deallocated,
-            mergeable,
-        } => {
-            let this_dir = Path::new(".");
-            let descriptor =
-                load_pile_descriptor(this_dir).context("Failed to load pile descriptor")?;
-            cleanup::compact(
-                this_dir,
-                &descriptor,
-                !*dry_run,
-                true,
-                CompactionThresholds {
-                    minimum_to_reclaim: min_reclaim.unwrap_or(2 * 1024 * 1024 * 1024),
-                    minimum_small_bloblogs_to_merge: mergeable.unwrap_or(64),
-                    cond_if_more_deallocated_than: max_deallocated.unwrap_or(256 * 1024 * 1024),
-                    cond_if_less_allocated_than: small_thresh.unwrap_or(64 * 1024 * 1024),
-                },
-            )?;
-        }
        PileCommand::Init {} => {
            commands::init(".".as_ref())?;
        }
--- a/yama/src/debug.rs
+++ b/yama/src/debug.rs
@ -15,12 +15,13 @@ You should have received a copy of the GNU General Public License
 along with Yama.  If not, see <https://www.gnu.org/licenses/>.
 */

-use crate::commands::retrieve_tree_node;
+use crate::commands::{fully_integrate_pointer_node, retrieve_tree_node, store_tree_node};
 use crate::definitions::{FilesystemOwnership, FilesystemPermissions, TreeNode};
-use crate::operations::remove_pointer_safely;
 use crate::pile::{Pile, PileDescriptor, RawPile};
+use crate::tree::integrate_node_in_place;
 use anyhow::anyhow;
 use clap::Parser;
+use log::info;
 use rustyline::error::ReadlineError;
 use rustyline::Editor;

@ -122,7 +123,50 @@ pub fn debug_command<RP: RawPile>(
            }
        }
        DebugCommand::DeletePointer { name } => {
-            remove_pointer_safely(pile, name)?;
+            // retrieve this pointer
+            let mut this_pointer = pile.read_pointer(name.as_str())?.ok_or_else(|| {
+                anyhow!("Pointer {:?} does not exist so can not be deleted.", name)
+            })?;
+            let mut this_node = retrieve_tree_node(&pile, this_pointer.chunk_ref.clone())?;
+
+            // fully integrate the pointer
+            fully_integrate_pointer_node(&pile, &mut this_node.node, &mut this_pointer)?;
+            assert!(this_pointer.parent_pointer.is_none());
+
+            // now integrate any pointers that rely on this one
+            // so that they no longer rely on this one.
+            for pointer in pile.list_pointers()?.iter() {
+                if pointer == name {
+                    continue;
+                }
+                if let Some(mut pointer_data) = pile.read_pointer(pointer.as_str())? {
+                    if let Some(parent_pointer) = pointer_data.parent_pointer.as_ref() {
+                        if parent_pointer == name {
+                            info!("Pointer is now an orphan: {:?}", pointer);
+
+                            // need to integrate this node, so retrieve it
+                            let mut node = retrieve_tree_node(&pile, pointer_data.chunk_ref)?;
+
+                            // integrate it in-place
+                            integrate_node_in_place(&mut node.node, &this_node.node)?;
+
+                            // mark it as orphaned (no parent)
+                            pointer_data.parent_pointer = None;
+
+                            // store the orphaned node
+                            let new_chunk_ref = store_tree_node(&pile, &node)?;
+                            // associate the orphaned node with the orphaned pointer
+                            pointer_data.chunk_ref = new_chunk_ref;
+                            // write the pointer back.
+                            pile.write_pointer(pointer.as_str(), &pointer_data)?;
+                        }
+                    }
+                }
+            }
+
+            // then delete the pointer
+            pile.delete_pointer(name)?;
+            info!("Deleted pointer: {:?}", name);
        }
        DebugCommand::PointerInfo { name } => {
            let this_pointer = pile
--- a/yama/src/definitions.rs
+++ b/yama/src/definitions.rs
@ -270,19 +270,6 @@ impl TreeNode {
            }
        }
    }
-
-    /// Recurses into a child by name, or returns Err with a reason.
-    pub fn child(&mut self, name: &str) -> Result<&mut TreeNode, &'static str> {
-        match self {
-            TreeNode::NormalFile { .. } => Err("not a directory: normal file"),
-            TreeNode::Directory { children, .. } => match children.get_mut(name) {
-                None => Err("child not in directory"),
-                Some(node) => Ok(node),
-            },
-            TreeNode::SymbolicLink { .. } => Err("not a directory: symlink"),
-            TreeNode::Deleted => Err("not a directory: deleted"),
-        }
-    }
 }

 #[derive(Debug, Copy, Clone, Serialize, Deserialize, PartialEq, Eq)]
--- a/yama/src/operations.rs
+++ b/yama/src/operations.rs
@ -1,80 +1,4 @@
-use crate::commands::{fully_integrate_pointer_node, retrieve_tree_node, store_tree_node};
-use crate::pile::{Pile, RawPile};
-use crate::tree::{differentiate_node_in_place, integrate_node_in_place};
-use anyhow::{anyhow, Context};
-use log::info;
-
 pub mod checking;
-pub mod cleanup;
 pub mod extracting;
 pub mod legacy_pushpull;
 pub mod storing;
-
-pub fn remove_pointer_safely<P: RawPile>(pile: &Pile<P>, name: &str) -> anyhow::Result<()> {
-    // retrieve this pointer
-    let mut this_pointer = pile
-        .read_pointer(name)?
-        .ok_or_else(|| anyhow!("Pointer {:?} does not exist so can not be deleted.", name))?;
-    let mut this_node = retrieve_tree_node(&pile, this_pointer.chunk_ref.clone())
-        .context("retrieving 'this' node")?;
-
-    let new_parent_name = this_pointer.parent_pointer.clone();
-    fully_integrate_pointer_node(pile, &mut this_node.node, &mut this_pointer)
-        .context("integrating new parent")?;
-
-    let new_parent = if let Some(ref new_parent_name) = new_parent_name {
-        let mut new_parent_pointer = pile
-            .read_pointer(new_parent_name.as_str())?
-            .ok_or_else(|| anyhow!("Parent pointer {:?} does not exist.", name))?;
-        let mut new_parent_node = retrieve_tree_node(&pile, new_parent_pointer.chunk_ref.clone())?;
-        fully_integrate_pointer_node(pile, &mut new_parent_node.node, &mut new_parent_pointer)?;
-        Some((new_parent_pointer, new_parent_node))
-    } else {
-        None
-    };
-
-    // now integrate any pointers that rely on this one
-    // so that they no longer rely on this one.
-    for pointer in pile.list_pointers()?.iter() {
-        if pointer == name {
-            continue;
-        }
-        if let Some(mut pointer_data) = pile.read_pointer(pointer.as_str())? {
-            if let Some(parent_pointer) = pointer_data.parent_pointer.as_ref() {
-                if parent_pointer == name {
-                    info!("Pointer would be orphaned: {:?}; integrating", pointer);
-
-                    // need to integrate this node, so retrieve it
-                    let mut node = retrieve_tree_node(&pile, pointer_data.chunk_ref)?;
-
-                    // integrate it in-place
-                    integrate_node_in_place(&mut node.node, &this_node.node)?;
-
-                    if let Some((_, ref new_parent_node)) = new_parent {
-                        // then differentiate with respect to the NEW parent
-                        differentiate_node_in_place(&mut node.node, &new_parent_node.node)?;
-                    }
-
-                    // pass through the parent
-                    pointer_data.parent_pointer = new_parent_name.clone();
-
-                    // store the updated version of the pointer
-                    let new_chunk_ref = store_tree_node(&pile, &node)?;
-                    // associate the new node with the new version of the pointer
-                    pointer_data.chunk_ref = new_chunk_ref;
-                    // write the pointer back.
-                    pile.write_pointer(pointer.as_str(), &pointer_data)?;
-
-                    // we must flush chunks before deleting the pointer
-                    pile.flush()
-                        .context("flushing after writing pointer back")?;
-                }
-            }
-        }
-    }
-
-    // then delete the pointer
-    pile.delete_pointer(name)?;
-    info!("Deleted pointer: {:?}", name);
-    Ok(())
-}
--- a/yama/src/operations/checking.rs
+++ b/yama/src/operations/checking.rs
@ -24,10 +24,8 @@ use crate::pile::{
 use anyhow::bail;
 use crossbeam_channel::Sender;
 use indicatif::{ProgressBar, ProgressDrawTarget, ProgressStyle};
-use itertools::Itertools;
 use log::{error, info, warn};
 use std::collections::HashSet;
-use std::convert::TryInto;
 use std::io::{Read, Write};
 use std::sync::Mutex;

@ -112,10 +110,6 @@ impl<RP: RawPile> RawPile for VacuumRawPile<RP> {
        self.underlying.delete(kind, key)
    }

-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        self.underlying.delete_many(kind, keys)
-    }
-
    fn list_keys(
        &self,
        kind: Keyspace,
@ -143,10 +137,6 @@ impl<RP: RawPile> RawPile for VacuumRawPile<RP> {
    fn describe_pipeline(&self) -> anyhow::Result<Vec<PipelineDescription>> {
        self.underlying.describe_pipeline()
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        self.underlying.chunk_id_transfer_ordering_hint(chunk_id)
-    }
 }

 /// Runs a full check of a Yama pile. This reads ALL the chunks, which can take a long time.
@ -413,21 +403,9 @@ pub fn check_shallow<RP: RawPile>(

            // actually do the vacuum!
            info!("Going to vacuum them up.");
-            for vacuum_ids_chunk in to_vacuum
-                .into_iter()
-                .chunks(512)
-                .into_iter()
-                .map(|c| c.collect::<Vec<ChunkId>>())
-            {
-                pile.raw_pile.delete_many(
-                    Keyspace::Chunk,
-                    vacuum_ids_chunk
-                        .iter()
-                        .map(|ci| ci.as_slice())
-                        .collect::<Vec<&[u8]>>()
-                        .as_slice(),
-                )?;
-                pbar.inc(vacuum_ids_chunk.len().try_into().unwrap());
+            for vacuum_id in to_vacuum {
+                pile.raw_pile.delete(Keyspace::Chunk, &vacuum_id)?;
+                pbar.inc(1);
            }
            pile.flush()?;
            pbar.finish_and_clear();
--- a/yama/src/operations/cleanup.rs
+++ b/yama/src/operations/cleanup.rs
@ -1,64 +0,0 @@
-use crate::pile::local_sqlitebloblogs::{CompactionThresholds, SqliteBloblogPile};
-use crate::pile::{PileDescriptor, PileStorage};
-use anyhow::{bail, Context};
-use indicatif::{ProgressBar, ProgressDrawTarget, ProgressStyle};
-use log::info;
-use std::path::Path;
-
-pub fn compact(
-    pile_path: &Path,
-    pile_desc: &PileDescriptor,
-    actually_run: bool,
-    make_progress_bar: bool,
-    thresholds: CompactionThresholds,
-) -> anyhow::Result<()> {
-    let pbar = if make_progress_bar {
-        ProgressBar::with_draw_target(1000 as u64, ProgressDrawTarget::stdout_with_hz(10))
-    } else {
-        ProgressBar::hidden()
-    };
-    pbar.set_style(
-        ProgressStyle::default_bar()
-            .template("[{elapsed_precise}]/[{eta}] {bar:40.cyan/blue} {pos:>7}/{len:7} {msg}"),
-    );
-    pbar.set_message("compacting");
-
-    match pile_desc.storage {
-        PileStorage::SqliteIndexedBloblog => {
-            let bloblog_pile = SqliteBloblogPile::open(&pile_path)
-                .context("Failed to open SQLite-indexed Bloblog Pile")?;
-            compact_bloblogs(bloblog_pile, pbar, actually_run, thresholds)?;
-            Ok(())
-        }
-        other @ PileStorage::RemoteOnly => {
-            bail!("Cannot use compaction on this kind of pile: {other:?}!");
-        }
-    }
-}
-
-fn compact_bloblogs(
-    bloblog_pile: SqliteBloblogPile,
-    pbar: ProgressBar,
-    actually_run: bool,
-    thresholds: CompactionThresholds,
-) -> anyhow::Result<()> {
-    info!("=== Analysing for compaction ===");
-    let analysis = bloblog_pile.analyse_for_compaction()?;
-    let chunks_total: u64 = analysis.values().map(|bs| bs.chunks_total).sum();
-    let chunks_deleted: u64 = analysis.values().map(|bs| bs.chunks_deleted).sum();
-    let bytes_total: u64 = analysis.values().map(|bs| bs.bytes_total).sum();
-    let bytes_deleted: u64 = analysis.values().map(|bs| bs.bytes_deleted).sum();
-
-    info!("{} bloblogs in this pile, with {chunks_total} chunks ({bytes_total} B) of which {chunks_deleted} ({bytes_deleted} B) are deleted.", analysis.len());
-
-    info!("=== Planning compaction ===");
-    let plan = bloblog_pile.plan_compaction(&thresholds, analysis)?;
-    info!("Planned compaction: replace {} bloblogs (of which {} are small), freeing up {} B and rewriting {} B", plan.bloblogs_to_replace.len(), plan.small_bloblogs, plan.reclaimable_space, plan.bytes_to_write);
-
-    if actually_run {
-        info!("=== Compacting ===");
-        bloblog_pile.perform_compaction(Box::new(pbar), plan)?;
-    }
-
-    Ok(())
-}
--- a/yama/src/pile.rs
+++ b/yama/src/pile.rs
@ -141,7 +141,6 @@ pub trait RawPile: Send + Sync + Debug + 'static {
    fn read(&self, kind: Keyspace, key: &[u8]) -> anyhow::Result<Option<Vec<u8>>>;
    fn write(&self, kind: Keyspace, key: &[u8], value: &[u8]) -> anyhow::Result<()>;
    fn delete(&self, kind: Keyspace, key: &[u8]) -> anyhow::Result<()>;
-    fn delete_many(&self, kind: Keyspace, key: &[&[u8]]) -> anyhow::Result<()>;
    fn list_keys(
        &self,
        kind: Keyspace,
@ -168,10 +167,6 @@ pub trait RawPile: Send + Sync + Debug + 'static {
    ) -> anyhow::Result<Sender<(ChunkId, Vec<u8>)>>;

    fn describe_pipeline(&self) -> anyhow::Result<Vec<PipelineDescription>>;
-
-    /// Return a u64 order token that indicates the optimum order to read this chunk in
-    /// compared to other chunks.
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64>;
 }

 impl RawPile for Box<dyn RawPile> {
@ -187,9 +182,6 @@ impl RawPile for Box<dyn RawPile> {
    fn delete(&self, kind: Keyspace, key: &[u8]) -> anyhow::Result<()> {
        self.as_ref().delete(kind, key)
    }
-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        self.as_ref().delete_many(kind, keys)
-    }
    fn list_keys(
        &self,
        kind: Keyspace,
@ -218,10 +210,6 @@ impl RawPile for Box<dyn RawPile> {
    fn describe_pipeline(&self) -> anyhow::Result<Vec<PipelineDescription>> {
        self.as_ref().describe_pipeline()
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        self.as_ref().chunk_id_transfer_ordering_hint(chunk_id)
-    }
 }

 impl<RP: RawPile> RawPile for Arc<RP> {
@ -237,9 +225,6 @@ impl<RP: RawPile> RawPile for Arc<RP> {
    fn delete(&self, kind: Keyspace, key: &[u8]) -> anyhow::Result<()> {
        self.as_ref().delete(kind, key)
    }
-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        self.as_ref().delete_many(kind, keys)
-    }
    fn list_keys(
        &self,
        kind: Keyspace,
@ -268,10 +253,6 @@ impl<RP: RawPile> RawPile for Arc<RP> {
    fn describe_pipeline(&self) -> anyhow::Result<Vec<PipelineDescription>> {
        self.as_ref().describe_pipeline()
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        self.as_ref().chunk_id_transfer_ordering_hint(chunk_id)
-    }
 }

 #[derive(Debug)]
--- a/yama/src/pile/access_guard.rs
+++ b/yama/src/pile/access_guard.rs
@ -83,10 +83,6 @@ impl<R: Clone + RawPile> RawPile for PileGuard<R> {
        bail!("Access denied");
    }

-    fn delete_many(&self, _kind: Keyspace, _keys: &[&[u8]]) -> anyhow::Result<()> {
-        bail!("Access denied");
-    }
-
    fn list_keys(
        &self,
        _kind: Keyspace,
@ -134,8 +130,4 @@ impl<R: Clone + RawPile> RawPile for PileGuard<R> {
        // TODO(question) Should we be described in the pipeline?
        self.underlying.describe_pipeline()
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        self.underlying.chunk_id_transfer_ordering_hint(chunk_id)
-    }
 }
--- a/yama/src/pile/compression.rs
+++ b/yama/src/pile/compression.rs
@ -278,10 +278,6 @@ impl<R: RawPile> RawPile for RawPileCompressor<R> {
        self.underlying.delete(kind, key)
    }

-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        self.underlying.delete_many(kind, keys)
-    }
-
    fn list_keys(
        &self,
        kind: Keyspace,
@ -352,8 +348,4 @@ impl<R: RawPile> RawPile for RawPileCompressor<R> {
        });
        Ok(underlying)
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        self.underlying.chunk_id_transfer_ordering_hint(chunk_id)
-    }
 }
--- a/yama/src/pile/encryption.rs
+++ b/yama/src/pile/encryption.rs
@ -101,10 +101,6 @@ impl<R: RawPile> RawPile for RawPileEncryptor<R> {
        self.underlying.delete(kind, key)
    }

-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        self.underlying.delete_many(kind, keys)
-    }
-
    fn list_keys(
        &self,
        kind: Keyspace,
@ -131,8 +127,4 @@ impl<R: RawPile> RawPile for RawPileEncryptor<R> {
        underlying.push(PipelineDescription::Encryption);
        Ok(underlying)
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        self.underlying.chunk_id_transfer_ordering_hint(chunk_id)
-    }
 }
--- a/yama/src/pile/integrity.rs
+++ b/yama/src/pile/integrity.rs
@ -98,10 +98,6 @@ impl<RP: RawPile> RawPile for RawPileIntegrityChecker<RP> {
        self.underlying.delete(kind, key)
    }

-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        self.underlying.delete_many(kind, keys)
-    }
-
    fn list_keys(
        &self,
        kind: Keyspace,
@ -153,8 +149,4 @@ impl<RP: RawPile> RawPile for RawPileIntegrityChecker<RP> {
        underlying.push(PipelineDescription::Integrity);
        Ok(underlying)
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        self.underlying.chunk_id_transfer_ordering_hint(chunk_id)
-    }
 }
--- a/yama/src/pile/local_sqlitebloblogs.rs
+++ b/yama/src/pile/local_sqlitebloblogs.rs
@ -15,23 +15,20 @@ You should have received a copy of the GNU General Public License
 along with Yama.  If not, see <https://www.gnu.org/licenses/>.
 */

-use std::collections::{BTreeMap, BTreeSet, HashMap, VecDeque};
+use std::collections::hash_map::Entry;
+use std::collections::{HashMap, VecDeque};
 use std::convert::{TryFrom, TryInto};
-use std::fs::{read_dir, remove_file, File, OpenOptions};
+use std::fs::{read_dir, File, OpenOptions};
 use std::io::{Read, Seek, SeekFrom, Write};
-use std::os::unix::fs::MetadataExt;
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, Condvar, Mutex};
-use std::time::Duration;
 use std::{fs, thread};

-use anyhow::{bail, ensure, Context};
+use anyhow::{bail, Context};
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
-use crossbeam_channel::{Receiver, Sender};
 use log::{info, warn};
 use nix::unistd::sync;
-use rusqlite::ffi::ErrorCode::ConstraintViolation;
-use rusqlite::{params, Error, ErrorCode, Transaction, TransactionBehavior, NO_PARAMS};
+use rusqlite::{params, Error, ErrorCode, Transaction};
 use rusqlite::{Connection, OptionalExtension};

 use crate::definitions::ChunkId;
@ -39,8 +36,10 @@ use crate::pile::{
    ControllerMessage, DebugStatistics, Keyspace, PipelineDescription, RawPile,
    StoragePipelineSettings,
 };
-use crate::progress::ProgressTracker;
-use crate::utils::{bytes_to_hexstring, LruMap};
+use crate::utils::bytes_to_hexstring;
+use crossbeam_channel::{Receiver, Sender};
+use rusqlite::ffi::ErrorCode::ConstraintViolation;
+use std::time::Duration;

 /// Bloblogs will not be reused if they are already 2 GiB large.
 pub const MAX_BLOBLOG_REUSE_SIZE: u64 = 2 * 1024 * 1024 * 1024;
@ -48,14 +47,6 @@ pub const MAX_BLOBLOG_REUSE_SIZE: u64 = 2 * 1024 * 1024 * 1024;
 /// This many pointers will be batched up for writing.
 pub const POINTER_WRITE_BATCHES: usize = 2048;

-/// This many bloblogs will be kept open for reading, at maximum.
-pub const BLOBLOG_MAX_READING_FILE_COUNT: usize = 128;
-
-/// Size of a blob header within a bloblog.
-/// 32 byte Chunk Id
-/// 4 byte (u32) Blob size
-pub const BLOB_HEADER_SIZE: u64 = 32 + 4;
-
 /// A file storing a log of blobs.
 /// Format:
 ///     Repeated:
@ -145,8 +136,8 @@ pub type BloblogId = u32;
 #[derive(Debug)]
 pub struct Inner {
    next_bloblog_id: BloblogId,
-    writer_bloblogs: Vec<(BloblogId, Arc<Mutex<Bloblog>>)>,
-    reader_bloblogs: LruMap<BloblogId, Arc<Mutex<Bloblog>>>,
+    writer_bloblogs: Vec<BloblogId>,
+    open_bloblogs: HashMap<BloblogId, Arc<Mutex<Bloblog>>>, // TODO want an LRU cache with a weak hashmap...?
    connection: Connection,
    writers_in_progress: u16,
    // We batch up pointer writes because sync() performance really hurts us if we do them one by
@ -280,7 +271,7 @@ impl SqliteBloblogPile {
            inner: Arc::new(Mutex::new(Inner {
                next_bloblog_id: 0,
                writer_bloblogs: Vec::new(),
-                reader_bloblogs: LruMap::new(BLOBLOG_MAX_READING_FILE_COUNT),
+                open_bloblogs: HashMap::new(),
                connection,
                writers_in_progress: 0,
                queued_pointer_writes: Default::default(),
@ -293,53 +284,51 @@ impl SqliteBloblogPile {

    fn open_bloblog(&self, bloblog_id: BloblogId) -> anyhow::Result<Arc<Mutex<Bloblog>>> {
        let mut inner = self.inner.lock().unwrap();
-
-        match inner.reader_bloblogs.get(&bloblog_id) {
-            Some(bloblog) => Ok(bloblog.clone()),
-            None => {
+        Ok(match inner.open_bloblogs.entry(bloblog_id) {
+            Entry::Occupied(entry) => entry.get().clone(),
+            Entry::Vacant(entry) => {
                let bloblog = Arc::new(Mutex::new(Bloblog::open(
                    &self.path.join(&bloblog_id.to_string()),
                )?));
-                inner.reader_bloblogs.insert(bloblog_id, bloblog.clone());
-                Ok(bloblog)
+                entry.insert(bloblog.clone());
+                bloblog
            }
-        }
+        })
    }

    fn get_writing_bloblog(&self) -> anyhow::Result<(BloblogId, Arc<Mutex<Bloblog>>)> {
        let mut inner = self.inner.lock().unwrap();
+        let writing_bloblog_id: BloblogId = match inner.writer_bloblogs.pop() {
+            None => {
+                loop {
+                    let pre_inc = inner.next_bloblog_id;
+                    inner.next_bloblog_id += 1;

-        inner.writers_in_progress += 1;
-
-        if let Some(writing_bloblog) = inner.writer_bloblogs.pop() {
-            // We already have an open bloblog to give back.
-            return Ok(writing_bloblog);
-        }
-
-        // No open bloblogs to reuse; create a new one.
-        // It's very important to create a fresh one here; we definitely don't want to use a file
-        // that someone else is using!
-        let writing_bloblog_id = loop {
-            let pre_inc = inner.next_bloblog_id;
-            inner.next_bloblog_id += 1;
-
-            // only start writing here if it doesn't already exist!
-            let bloblog_path = &self.path.join(&pre_inc.to_string());
-            if !bloblog_path.exists() {
-                break pre_inc;
+                    // only start writing here if it doesn't already exist!
+                    let bloblog_path = &self.path.join(&pre_inc.to_string());
+                    if !bloblog_path.exists() {
+                        break pre_inc;
+                    }
+                }
            }
+            Some(id) => id,
        };

-        let bloblog = Arc::new(Mutex::new(Bloblog::open(
-            &self.path.join(&writing_bloblog_id.to_string()),
-        )?));
-
-        // MAYBE FUTURE // Insert a weak reference so we can easily get a reader for this if desired.
-        // inner.open_bloblogs.insert(writing_bloblog_id, Arc::downgrade(&bloblog));
-        // For now, I don't think we actually care about reading a bloblog that we've written
-        // (at least not usually?)
-
-        Ok((writing_bloblog_id, bloblog))
+        let result = Ok((
+            writing_bloblog_id,
+            match inner.open_bloblogs.entry(writing_bloblog_id) {
+                Entry::Occupied(entry) => entry.get().clone(),
+                Entry::Vacant(entry) => {
+                    let bloblog = Arc::new(Mutex::new(Bloblog::open(
+                        &self.path.join(&writing_bloblog_id.to_string()),
+                    )?));
+                    entry.insert(bloblog.clone());
+                    bloblog
+                }
+            },
+        ));
+        inner.writers_in_progress += 1;
+        result
    }

    /// Should be called once the bloblog has been finished writing to for the moment.
@ -352,7 +341,7 @@ impl SqliteBloblogPile {
        let size = bloblog.lock().unwrap().filesize()?;
        let mut inner = self.inner.lock().unwrap();
        if size < MAX_BLOBLOG_REUSE_SIZE {
-            inner.writer_bloblogs.push((id, bloblog));
+            inner.writer_bloblogs.push(id);
        }
        inner.writers_in_progress -= 1;
        if inner.writers_in_progress == 0 {
@ -378,31 +367,6 @@ impl SqliteBloblogPile {
            .optional()?)
    }

-    fn get_chunk_pointers(
-        &self,
-        chunk_ids: &[&[u8]],
-    ) -> anyhow::Result<Vec<Option<BloblogPointer>>> {
-        let mut inner = self.inner.lock().unwrap();
-        let txn = inner.connection.transaction()?;
-        let mut result = Vec::with_capacity(chunk_ids.len());
-        {
-            let mut stmt = txn.prepare("SELECT bloblog, offset FROM chunks WHERE chunk_id = ?1")?;
-            for &chunk_id in chunk_ids {
-                let bloglog_pointer: Option<BloblogPointer> = stmt
-                    .query_row(params![chunk_id], |row| {
-                        Ok(BloblogPointer {
-                            bloblog: row.get(0)?,
-                            offset: row.get::<_, i64>(1)? as u64,
-                        })
-                    })
-                    .optional()?;
-                result.push(bloglog_pointer);
-            }
-        }
-        txn.commit()?;
-        Ok(result)
-    }
-
    fn put_chunk_pointer(&self, chunk_id: &ChunkId, pointer: BloblogPointer) -> anyhow::Result<()> {
        let mut inner = self.inner.lock().unwrap();
        let offset_i64 = i64::try_from(pointer.offset).expect("ouch! can't turn u64 into i64...");
@ -528,341 +492,6 @@ impl SqliteBloblogPile {
        assert!(pointers_buffered.is_empty());
        Ok(())
    }
-
-    /// Look at the bloblogs in this pile and see where space may be reclaimable if we were to
-    /// compact.
-    ///
-    /// Next step: plan_compaction
-    pub fn analyse_for_compaction(&self) -> anyhow::Result<BTreeMap<BloblogId, BloblogStats>> {
-        let mut inner = self.inner.lock().unwrap();
-        // Lock the database right away.
-        let txn = inner
-            .connection
-            .transaction_with_behavior(TransactionBehavior::Exclusive)?;
-        let mut stmt = txn.prepare(
-            "
-            SELECT bloblog, COUNT(c.offset), COUNT(d.offset), SUM(COALESCE(d.size, 0))
-            FROM chunks c LEFT JOIN deleted d USING (bloblog, offset)
-            GROUP BY bloblog
-        ",
-        )?;
-
-        struct UnpopulatedBloblogStats {
-            pub bloblog_id: BloblogId,
-            pub chunks_total: u64,
-            pub chunks_deleted: u64,
-            pub bytes_deleted: u64,
-        }
-
-        let unpopul_bloblog_stats = stmt.query_map(NO_PARAMS, |row| {
-            Ok(UnpopulatedBloblogStats {
-                bloblog_id: row.get(0)?,
-                chunks_total: row.get::<_, i64>(1)?.try_into().expect("i64 -> u64"),
-                chunks_deleted: row.get::<_, i64>(2)?.try_into().expect("i64 -> u64"),
-                bytes_deleted: row.get::<_, i64>(3)?.try_into().expect("i64 -> u64"),
-            })
-        })?;
-
-        let mut final_stats = BTreeMap::new();
-
-        for unpopul_stat in unpopul_bloblog_stats {
-            let UnpopulatedBloblogStats {
-                bloblog_id,
-                chunks_total,
-                chunks_deleted,
-                bytes_deleted,
-            } = unpopul_stat?;
-            let bloblog_path = self.path.join(&bloblog_id.to_string());
-            let bytes_total = std::fs::metadata(&bloblog_path)
-                .with_context(|| format!("Failed to get metadata for bloblog: {:?}", bloblog_path))?
-                .size();
-
-            final_stats.insert(
-                bloblog_id,
-                BloblogStats {
-                    chunks_total,
-                    chunks_deleted,
-                    bytes_total,
-                    // Add a slight correction since we can count the blob headers of deleted blobs
-                    // as deleted.
-                    bytes_deleted: bytes_deleted + chunks_deleted * BLOB_HEADER_SIZE,
-                },
-            );
-        }
-
-        Ok(final_stats)
-    }
-
-    /// Look at the analysis of compaction and, using the specified thresholds, come up with a plan
-    /// to perform compaction.
-    ///
-    /// May return an empty plan if compaction isn't worthwhile.
-    ///
-    /// Previous step: analyse_for_compaction
-    /// Next step: perform_compaction
-    pub fn plan_compaction(
-        &self,
-        thresholds: &CompactionThresholds,
-        analysis: BTreeMap<BloblogId, BloblogStats>,
-    ) -> anyhow::Result<CompactionPlan> {
-        let bloblogs_to_replace: BTreeMap<BloblogId, BloblogStats> = analysis
-            .into_iter()
-            .filter(|(_id, stats)| thresholds.should_replace_bloblog(stats))
-            .collect();
-        let reclaimable_space: u64 = bloblogs_to_replace
-            .values()
-            .map(|bs| bs.bytes_deleted)
-            .sum();
-        let bytes_to_write: u64 = bloblogs_to_replace
-            .values()
-            .map(|bs| bs.bytes_total - bs.bytes_deleted)
-            .sum();
-        let small_bloblogs: u32 = bloblogs_to_replace
-            .values()
-            .filter(|bs| bs.bytes_total - bs.bytes_deleted < thresholds.cond_if_less_allocated_than)
-            .count() as u32;
-
-        if reclaimable_space < thresholds.minimum_to_reclaim
-            && small_bloblogs < thresholds.minimum_small_bloblogs_to_merge
-        {
-            // Nothing worth doing: return an empty plan.
-            return Ok(CompactionPlan {
-                bloblogs_to_replace: Default::default(),
-                bytes_to_write: 0,
-                reclaimable_space: 0,
-                small_bloblogs: 0,
-            });
-        }
-
-        Ok(CompactionPlan {
-            bloblogs_to_replace: bloblogs_to_replace.keys().copied().collect(),
-            bytes_to_write,
-            reclaimable_space,
-            small_bloblogs,
-        })
-    }
-
-    /// Given a compaction plan, perform the compaction.
-    /// There shouldn't be any decisions left to be made at this point: just action.
-    ///
-    /// TODO flock the bloblogs to be removed and make readers and writers also flock them too.
-    ///
-    /// TODO find a way to deal with bloblogs that are entirely unreferenced from the index
-    ///      (e.g. bloblogs that weren't written properly, e.g. if compaction fails.)
-    pub fn perform_compaction(
-        &self,
-        mut progress: Box<dyn ProgressTracker>,
-        plan: CompactionPlan,
-    ) -> anyhow::Result<()> {
-        #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
-        struct ReplacedBlobRow {
-            pub old_bloblog: BloblogId,
-            pub old_offset: u64,
-            pub chunk_id: ChunkId,
-        }
-
-        if plan.bloblogs_to_replace.is_empty() {
-            info!("No compaction to be done.");
-            return Ok(());
-        }
-
-        let mut to_preserve = BTreeSet::new();
-        let mut replacements = BTreeMap::new();
-
-        progress.set_max_size(plan.bytes_to_write);
-
-        // First find all the blobs we need to replace.
-        {
-            let mut inner = self.inner.lock().unwrap();
-            // Lock the database right away.
-            let txn = inner
-                .connection
-                .transaction_with_behavior(TransactionBehavior::Exclusive)?;
-            let mut stmt = txn.prepare(
-                "
-                SELECT chunk_id, c.offset
-                FROM chunks c LEFT JOIN deleted d USING (bloblog, offset)
-                WHERE bloblog = ?1 AND d.offset IS NULL
-            ",
-            )?;
-            for bloblog in plan.bloblogs_to_replace.iter().copied() {
-                to_preserve.extend(
-                    stmt.query_map([bloblog], |row| {
-                        let mut chunk_id = ChunkId::default();
-                        chunk_id.copy_from_slice(row.get::<_, Vec<u8>>(0).unwrap().as_slice());
-                        Ok(ReplacedBlobRow {
-                            old_bloblog: bloblog,
-                            chunk_id,
-                            old_offset: row.get::<_, i64>(1).unwrap().try_into().unwrap(),
-                        })
-                    })?
-                    .collect::<Result<Vec<ReplacedBlobRow>, _>>()?,
-                );
-            }
-        }
-
-        // Then make the replacements
-        info!("Rewriting bloblogs...");
-        let mut buf = Vec::new();
-        let mut iterator = to_preserve.into_iter();
-        loop {
-            let (new_bloblog_id, bloglog_mutex) = self.get_writing_bloblog()?;
-            let mut new_bloblog = bloglog_mutex.lock().expect("Failed to lock bloblog?");
-            let mut is_more = false;
-
-            while let Some(preserve) = iterator.next() {
-                is_more = true;
-
-                // Get hold of the old bloblog
-                let old_bloblog = self.open_bloblog(preserve.old_bloblog)?;
-                let mut old_bloblog = old_bloblog.lock().unwrap();
-
-                // Transfer the blob
-                buf.clear();
-                old_bloblog.read_blob(preserve.old_offset, &preserve.chunk_id, &mut buf)?;
-                let new_offset = new_bloblog.write_blob(&preserve.chunk_id, &buf)?;
-
-                // Make a note of the replacement
-                replacements.insert(
-                    preserve,
-                    BloblogPointer {
-                        bloblog: new_bloblog_id,
-                        offset: new_offset,
-                    },
-                );
-
-                progress.inc_progress(buf.len() as u64);
-
-                if new_bloblog.filesize()? > MAX_BLOBLOG_REUSE_SIZE {
-                    // get a new bloblog to write with.
-                    break;
-                }
-            }
-
-            drop(new_bloblog);
-            self.return_writing_bloblog(new_bloblog_id, bloglog_mutex)?;
-
-            if !is_more {
-                break;
-            }
-        }
-
-        info!("Applying replacements...");
-        {
-            let mut inner = self.inner.lock().unwrap();
-            // Lock the database right away.
-            let txn = inner
-                .connection
-                .transaction_with_behavior(TransactionBehavior::Exclusive)?;
-            let mut stmt = txn.prepare(
-                "
-                UPDATE chunks
-                SET bloblog = ?1, offset = ?2
-                WHERE chunk_id = ?3
-            ",
-            )?;
-
-            for (replacement_row, new_pos) in replacements {
-                ensure!(
-                    stmt.execute(params![
-                        new_pos.bloblog,
-                        new_pos.offset as i64,
-                        &replacement_row.chunk_id as &[u8]
-                    ])? == 1,
-                    "Wrong number of rows updated for replacement!"
-                );
-            }
-
-            drop(stmt);
-            txn.commit().context("committing replacements")?;
-        }
-
-        // TODO fsync new bloblogs
-
-        info!("Deleting old bloblogs...");
-        {
-            let mut inner = self.inner.lock().unwrap();
-            // Lock the database right away.
-            let txn = inner
-                .connection
-                .transaction_with_behavior(TransactionBehavior::Exclusive)?;
-
-            for bloblog_id in plan.bloblogs_to_replace.iter().copied() {
-                let deleted_chunks = txn.execute(
-                    "
-                    DELETE FROM chunks WHERE bloblog = ?1
-                ",
-                    params![bloblog_id],
-                )?;
-
-                let deleted_deleted = txn.execute(
-                    "
-                    DELETE FROM deleted WHERE bloblog = ?1
-                ",
-                    params![bloblog_id],
-                )?;
-
-                ensure!(deleted_chunks == deleted_deleted, "Undeleted chunks left in bloblog {bloblog_id}: CHUNKS={deleted_chunks} DELETED={deleted_deleted}");
-
-                let bloblog_path = self.path.join(bloblog_id.to_string());
-                remove_file(&bloblog_path).with_context(|| {
-                    format!("Failed to remove obsolete bloblog: {:?}", bloblog_path)
-                })?;
-            }
-
-            txn.commit()?;
-        }
-
-        Ok(())
-    }
-}
-
-pub struct BloblogStats {
-    pub chunks_total: u64,
-    pub chunks_deleted: u64,
-    pub bytes_total: u64,
-    pub bytes_deleted: u64,
-}
-
-pub struct CompactionPlan {
-    pub bloblogs_to_replace: BTreeSet<BloblogId>,
-    pub bytes_to_write: u64,
-    pub reclaimable_space: u64,
-    pub small_bloblogs: u32,
-}
-
-pub struct CompactionThresholds {
-    /// Minimum bytes to be reclaimable overall for compaction to be worthwhile.
-    pub minimum_to_reclaim: u64,
-
-    /// (alternative reason) Minimum number of files to be undersized in order for compaction
-    /// to be worthwhile.
-    /// This gives us a way to make compaction run if we have lots of tiny bloblogs.
-    pub minimum_small_bloblogs_to_merge: u32,
-
-    /// A bloblog will be replaced if the deallocated size is greater than this.
-    pub cond_if_more_deallocated_than: u64,
-
-    /// A bloblog will be replaced if the allocated size is less than this.
-    pub cond_if_less_allocated_than: u64,
-}
-
-impl CompactionThresholds {
-    pub fn should_replace_bloblog(&self, bloblog_stats: &BloblogStats) -> bool {
-        let allocated = bloblog_stats.bytes_total - bloblog_stats.bytes_deleted;
-        // Note that this will also trigger for fully-deallocated files if
-        let is_small = allocated < self.cond_if_less_allocated_than;
-        let has_large_deallocations =
-            bloblog_stats.bytes_deleted > self.cond_if_more_deallocated_than;
-        is_small || has_large_deallocations
-    }
-}
-
-pub struct CompactionOutcome {
-    pub bloblogs_deleted: u32,
-    pub bloblogs_created: u32,
-    pub bytes_deleted: u32,
-    pub bytes_created: u32,
 }

 impl Drop for SqliteBloblogPile {
@ -1007,59 +636,6 @@ impl RawPile for SqliteBloblogPile {
            }
        }
    }
-
-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        match kind {
-            Keyspace::Chunk => {
-                let mut chunk_pointers_by_bloblog: BTreeMap<BloblogId, Vec<(u64, &[u8])>> =
-                    BTreeMap::new();
-
-                for (chunk_pointer, chunk_id) in self
-                    .get_chunk_pointers(keys)
-                    .context("failed to get chunk pointers")?
-                    .into_iter()
-                    .zip(keys)
-                    .filter_map(|(pointer, &chunk_id)| match pointer {
-                        Some(pointer) => Some((pointer, chunk_id)),
-                        None => None,
-                    })
-                {
-                    chunk_pointers_by_bloblog
-                        .entry(chunk_pointer.bloblog)
-                        .or_default()
-                        .push((chunk_pointer.offset, chunk_id));
-                }
-                let mut inner = self.inner.lock().unwrap();
-                let txn = inner.connection.transaction()?;
-                {
-                    let mut stmt = txn.prepare(
-                        "INSERT OR IGNORE INTO deleted (bloblog, offset, size)
-                            VALUES (?1, ?2, ?3)",
-                    )?;
-                    for (bloblog_id, entries) in chunk_pointers_by_bloblog {
-                        let bloblog_mutex = self.open_bloblog(bloblog_id)?;
-                        let mut bloblog = bloblog_mutex.lock().unwrap();
-                        for (chunk_offset, raw_chunk_id) in entries {
-                            let mut chunk_id: ChunkId = Default::default();
-                            chunk_id.copy_from_slice(raw_chunk_id);
-                            let size = bloblog.blob_len(chunk_offset, &chunk_id)?;
-                            let offset_i64 = i64::try_from(chunk_offset)
-                                .expect("ouch! can't turn u64 into i64...");
-                            stmt.execute(params![bloblog_id, offset_i64, size])?;
-                        }
-                    }
-                }
-                txn.commit().context("Failed to commit chunk deletions")?;
-            }
-            _ => {
-                for &key in keys {
-                    self.delete(kind, key)?;
-                }
-            }
-        }
-        Ok(())
-    }
-
    fn list_keys(
        &self,
        kind: Keyspace,
@ -1174,16 +750,6 @@ impl RawPile for SqliteBloblogPile {
    fn describe_pipeline(&self) -> anyhow::Result<Vec<PipelineDescription>> {
        Ok(vec![PipelineDescription::Store])
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        let chunk_pointer = self
-            .get_chunk_pointer(chunk_id)?
-            .context("Can't get chunk ID transfer ordering hint for chunk without pointer.")?;
-
-        // Scheme: 24-bit bloblog ID
-        // followed by 40-bit offset
-        Ok(((chunk_pointer.bloblog as u64) << 40) | (chunk_pointer.offset & 0xFF_FF_FF_FF_FF))
-    }
 }

 struct KeyIterator {
@ -1229,9 +795,8 @@ impl Iterator for KeyIterator {

 #[cfg(test)]
 mod tests {
-    use temp_dir::TempDir;
-
    use crate::pile::local_sqlitebloblogs::Bloblog;
+    use temp_dir::TempDir;

    #[test]
    pub fn bloblog_read_write_test() {
--- a/yama/src/remote/requester.rs
+++ b/yama/src/remote/requester.rs
@ -4,7 +4,7 @@ use std::sync::{Arc, Mutex};
 use std::thread;
 use std::thread::JoinHandle;

-use anyhow::{anyhow, bail};
+use anyhow::anyhow;
 use crossbeam_channel::{Receiver, Sender};
 use log::{error, info};

@ -307,12 +307,6 @@ impl RawPile for Requester {
            other => Err(anyhow!("Received {:?} for Delete", other)),
        }
    }
-    fn delete_many(&self, kind: Keyspace, keys: &[&[u8]]) -> anyhow::Result<()> {
-        for &key in keys {
-            self.delete(kind, key)?;
-        }
-        Ok(())
-    }
    fn list_keys(
        &self,
        kind: Keyspace,
@ -444,10 +438,6 @@ impl RawPile for Requester {
            other => Err(anyhow!("Received {:?} for Describe", other)),
        }
    }
-
-    fn chunk_id_transfer_ordering_hint(&self, _chunk_id: &ChunkId) -> anyhow::Result<u64> {
-        bail!("You probably shouldn't be using chunk ID transfer ordering hints with a remote.");
-    }
 }

 pub struct ListKeyIterator {
--- a/yama/src/tree.rs
+++ b/yama/src/tree.rs
@ -185,7 +185,7 @@ pub fn differentiate_node_in_place(new: &mut TreeNode, old: &TreeNode) -> anyhow
 /// result is in-place.
 ///
 /// Preconditions:
-/// - `old` must be an integrated pointer. (Otherwise this algorithm is not correct.)
+/// - `old` must be an integrated pointer.
 /// - `old` is the parent of `new`
 pub fn integrate_node_in_place(new: &mut TreeNode, old: &TreeNode) -> anyhow::Result<()> {
    if let TreeNode::Directory { children, .. } = new {
--- a/yama/src/utils.rs
+++ b/yama/src/utils.rs
@ -15,7 +15,6 @@ You should have received a copy of the GNU General Public License
 along with Yama.  If not, see <https://www.gnu.org/licenses/>.
 */

-use std::collections::{BTreeMap, BTreeSet};
 use std::fmt::Write;

 pub fn bytes_to_hexstring(chunkid: &[u8]) -> String {
@ -43,98 +42,3 @@ pub fn get_number_of_workers(first_try_env_name: &str) -> u8 {
        }
    }
 }
-
-#[derive(Clone, Debug)]
-pub struct LruMap<K, V> {
-    capacity: usize,
-    last_access: BTreeSet<(u64, K)>,
-    items: BTreeMap<K, (V, u64)>,
-    counter: u64,
-}
-
-impl<K: Ord + Clone, V> LruMap<K, V> {
-    pub fn new(capacity: usize) -> LruMap<K, V> {
-        LruMap {
-            capacity,
-            last_access: BTreeSet::new(),
-            items: BTreeMap::new(),
-            counter: 0,
-        }
-    }
-
-    /// Gets an item from the LRU map.
-    pub fn get(&mut self, key: &K) -> Option<&V> {
-        match self.items.get_mut(key) {
-            Some((value, last_used_instant)) => {
-                assert!(
-                    self.last_access.remove(&(*last_used_instant, key.clone())),
-                    "Corrupt LRU map: freshen not correct."
-                );
-                let new_instant = self.counter;
-                self.counter += 1;
-                self.last_access.insert((new_instant, key.clone()));
-                *last_used_instant = new_instant;
-                Some(value)
-            }
-            None => None,
-        }
-    }
-
-    pub fn insert(&mut self, key: K, value: V) -> Option<V> {
-        let new_instant = self.counter;
-        self.counter += 1;
-
-        let retval = match self.items.insert(key.clone(), (value, new_instant)) {
-            Some((old_entry, old_instant)) => {
-                assert!(
-                    self.last_access.remove(&(old_instant, key.clone())),
-                    "Corrupt LRU map: insert not correct."
-                );
-                Some(old_entry)
-            }
-            None => None,
-        };
-        self.last_access.insert((new_instant, key));
-
-        if retval.is_none() {
-            // We didn't replace any item, so we have grown by 1.
-            // Check if we need to evict.
-            if self.items.len() > self.capacity {
-                self.evict();
-            }
-        }
-
-        retval
-    }
-
-    pub fn evict(&mut self) -> Option<(K, V)> {
-        if let Some(first_entry) = self.last_access.iter().next().cloned() {
-            self.last_access.remove(&first_entry);
-            let (_, key) = first_entry;
-            let (value, _) = self
-                .items
-                .remove(&key)
-                .expect("Corrupt LRU map: last access and items out of sync");
-
-            Some((key, value))
-        } else {
-            None
-        }
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use crate::utils::LruMap;
-
-    #[test]
-    fn test_lru_map() {
-        let mut lmap = LruMap::new(3);
-        lmap.insert(1, 1);
-        lmap.insert(2, 1);
-        lmap.insert(3, 1);
-        assert_eq!(lmap.get(&1), Some(&1));
-        lmap.insert(4, 1);
-        assert_eq!(lmap.get(&2), None);
-    }
-}