Add lz4 to path to ensure the backup helpers can work

flake.nix

@@ -33,7 +33,8 @@
 
       # We want to produce a package with all of these together, with wrappers that let them
       # refer to each other by name (i.e. have each other on the path).
-      # ATM it's just Datman that needs them on the PATH.
+      # Datman needs the helpers on the path.
+      # The helpers need lz4 on the path.
       allInOne = pkgs.stdenv.mkDerivation {
         name = "datman-aio";
 
@@ -45,6 +46,7 @@
           ln -s ${rustComponents}/bin/{yama,datman} $out/bin
           ln -s ${mysqlHelper}/bin/datman-helper-mysql-{backup,restore} $out/bin
           ln -s ${postgresHelper}/bin/datman-helper-postgres-{backup,restore} $out/bin
+          ln -s ${pkgs.lz4}/bin/lz4 $out/bin/
           runHook postInstall
         '';
 
@@ -52,10 +54,9 @@
 
         postInstall = ''
           # set -eu
-          #for fn in $out/bin/{datman,yama,datman-helper-{mysql,postgres}-{backup,restore}}; do
-          #  wrapProgram $fn --suffix PATH : $out/bin
-          #done
-          wrapProgram $out/bin/datman --suffix PATH : $out/bin
+          for fn in $out/bin/{datman,yama,datman-helper-{mysql,postgres}-{backup,restore}}; do
+            wrapProgram $fn --suffix PATH : $out/bin
+          done
         '';
       };
     in rec {