Use DEBIAN_FRONTEND=noninteractive for apt install commands

Fixes #42.

scone/default/recipes/apt.py

@@ -140,7 +140,10 @@ class AptPackage(Recipe):
         retries = 3
 
         while retries > 0:
-            result = await kitchen.ut1areq(SimpleExec(args, "/"), SimpleExec.Result)
+            result = await kitchen.ut1areq(
+                SimpleExec(args, "/", {"DEBIAN_FRONTEND": "noninteractive"}),
+                SimpleExec.Result,
+            )
 
             logger.debug("E %r: %r", args, result.stderr)
 

scone/default/utensils/basic_utensils.py

@@ -22,7 +22,7 @@ import os
 import pwd
 import shutil
 import stat
-from typing import List, Optional
+from typing import Dict, List, Optional
 
 import attr
 
@@ -178,6 +178,7 @@ class Chmod(Utensil):
 class SimpleExec(Utensil):
     args: List[str]
     working_dir: str
+    environment: Optional[Dict[str, str]] = None
 
     @attr.s(auto_attribs=True)
     class Result:
@@ -191,6 +192,7 @@ class SimpleExec(Utensil):
             stdin=None,
             stdout=asyncio.subprocess.PIPE,
             stderr=asyncio.subprocess.PIPE,
+            env=self.environment,
             cwd=self.working_dir
         )