Use find to delete files recursively (#4732)

* Use find to delete files recursively

Instead of using rm -rf use find to delete files recursively. This
has the added benefit that we do not need to rely on shell expansion.

In particular, shell expansion caused the --one-file-system flag to
not work as intended: The idea was that the content of a (left-over)
bind mounted directory would not get deleted. However, since shell
expansion passed the directory to rm, rm happily deleted also files in
that bind mounted directory.

* Pass arguments correctly

* Fix argument order and stderr output

* Improve error handling

Log with exception level if there is an OS level error. Decode the
stderr output correctly.

* Remove unnecessary newline

Dockerfile

@@ -15,7 +15,7 @@ WORKDIR /usr/src
 RUN \
     set -x \
     && apk add --no-cache \
-        coreutils \
+        findutils \
         eudev \
         eudev-libs \
         git \

supervisor/utils/__init__.py

@@ -105,30 +105,36 @@ async def remove_folder(
             if any(item.match(exclude) for exclude in excludes):
                 moved_files.append(item.rename(temp_path / item.name))
 
-    del_folder = f"{folder}" + "/{,.[!.],..?}*" if content_only else f"{folder}"
+    find_args = []
+    if content_only:
+        find_args.extend(["-mindepth", "1"])
     try:
         proc = await asyncio.create_subprocess_exec(
-            "bash",
-            "-c",
-            f"rm -rf --one-file-system {del_folder}",
+            "/usr/bin/find",
+            folder,
+            "-xdev",
+            *find_args,
+            "-delete",
             stdout=asyncio.subprocess.DEVNULL,
+            stderr=asyncio.subprocess.PIPE,
             env=clean_env(),
         )
 
         _, error_msg = await proc.communicate()
     except OSError as err:
-        error_msg = str(err)
+        _LOGGER.exception("Can't remove folder %s: %s", folder, err)
     else:
         if proc.returncode == 0:
             return
+        _LOGGER.error(
+            "Can't remove folder %s: %s", folder, error_msg.decode("utf-8").strip()
+        )
     finally:
         if excludes:
             for item in moved_files:
                 item.rename(folder / item.name)
             temp.cleanup()
 
-    _LOGGER.error("Can't remove folder %s: %s", folder, error_msg)
-
 
 def clean_env() -> dict[str, str]:
     """Return a clean env from system."""