Make mtime setting happen as part of build script

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "toltecmk"
-version = "0.5.0"
+version = "0.5.1"
 authors = [
   { name="Mattéo Delabre", email="git.matteo@delab.re" },
   { name="Eeems", email="eeems@eeems.email" },

toltec/builder.py

@@ -7,6 +7,7 @@
 from types import TracebackType
 import re
 import os
+import shlex
 import logging
 import textwrap
 from importlib.util import find_spec, module_from_spec
@@ -400,19 +401,27 @@ def _build(self, recipe: Recipe, src_dir: str) -> None:
 
         logger.info("Building artifacts")
 
-        # Set fixed atime and mtime for all the source files
-        epoch = int(recipe.timestamp.timestamp())
-
-        for filename in util.list_tree(src_dir):
-            os.utime(filename, (epoch, epoch))
-
         mount_src = "/src"
         repo_src = "/repo"
         uid = os.getuid()
         gid = os.getgid()
+        restore_script: list[str] = []
+
+        # Set fixed atime and mtime for all the source files
+        epoch = int(recipe.timestamp.timestamp())
+        for file_path in util.list_tree(src_dir):
+            docker_path = shlex.quote(
+                os.path.join(mount_src, os.path.relpath(file_path, src_dir))
+            )
+            restore_script.append(
+                'echo "import os; os.utime('
+                + f'\\"{docker_path}\\", ns=({epoch}, {epoch})'
+                + ')" | python3 -u'
+            )
 
         logs = self._run_script(
             [
+                *restore_script,
                 f'cd "{mount_src}"',
                 recipe.build,
                 f"chown -R {uid}:{gid} {mount_src} {repo_src}",