fix(docker): keep /app read-only and chown /config conditionally - #253
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Three things kept /app from being read-only, all of which meant the container wrote into its own application directory: HOME was set to /app on both exec paths, so any library writing a dotfile or cache landed there — and in rootless mode /app is not writable by the supplied uid at all. HOME is now /config, which is the volume. Nothing in the app reads HOME, so this only moves where libraries put their own state. Python wrote .pyc next to the source. Bytecode is now compiled at build and PYTHONDONTWRITEBYTECODE stops runtime writes. `chmod -R a+rX /app` re-materialised the whole tree in its own layer to assert a property the COPYs already satisfy. Replaced with a build-time assertion that fails loudly if anything under /app is not world-readable and traversable. The /config chown also becomes conditional — `find ... ( ! -user X -o ! -group X )` touches only what is actually wrong instead of rewriting every inode on every start.
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. 📝 WalkthroughWalkthroughThe Docker build now stops when setup or validation commands fail. The entrypoint uses ChangesContainer runtime behavior
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The container changes keep /app read-only at runtime and limit /config ownership updates to entries that need them; no actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@Dockerfile`:
- Line 84: Remove the unconditional “success” fallback from the Dockerfile
command chaining the entrypoint chmod and Python compileall validation, so
failures from either operation propagate and fail the image build.
In `@scripts/entrypoint.sh`:
- Line 74: Update the ownership-correction command in the entrypoint flow to
stop execution when find or chown fails: remove the unconditional success
fallback, preserve the existing ownership operation, and ensure main.py is not
launched through su-exec after a correction failure.
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A chown through find follows a symlink and rewrites its target, so a link inside /config pointing at the host mount would have that file's ownership changed. Verified with a control: a plain chown moved a file outside the tree to 1000:1000 while chown -h left it untouched. compileall was chained with || true, which would ship an image with no bytecode on a syntax error — silently restoring the runtime .pyc writes the read-only /app change exists to prevent.
…ertion The directory branch only tested the execute bit, so a 711 directory passed — traversable by an arbitrary uid but not listable, which still breaks glob, scandir and module discovery. -perm -0005 requires both bits.
The chown correction ran with || true and then started the app regardless, so an inaccessible /config surfaced later as a confusing failure to create the log dir or persist state. A per-file chown error can be benign — foreign uids on a network mount — so rather than hard-failing on chown, the outcome that matters is asserted: if /config is not writable as PUID:PGID after correction, exit with a message naming the host-side fix.
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Inline comments:
In `@scripts/entrypoint.sh`:
- Line 78: Update the /config permission check in the entrypoint flow to require
both write and search access for the ${PUID}:${PGID} user, using test -w and
test -x together or an equivalent temporary-file create/remove check before
launching the application.
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test -w passes on a directory the process cannot actually write into — mode 600 satisfies it for the owner, and it does not exercise the search bit or a read-only mount. main.py then fails later creating files under /config. Creating and removing a probe file as PUID:PGID exercises write, search and the mount flags in one operation.
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@Dockerfile`:
- Line 85: Update the Dockerfile validation command chain around the unreadable
variable assignment to preserve failure propagation: replace the terminating
semicolon with && so chmod or compileall failures stop subsequent symlink
commands and fail the image build.
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The chain ended the `&&` sequence with `;` before the permission assertion, so a failed chmod or compileall skipped the assertion, left `unreadable` unset, and then ran the symlink commands — whose exit status became the layer's. The image built and shipped with unusable bytecode. Confirmed by breaking compileall with a syntax error: before, the build succeeded; now it exits 1 on that step. `set -e` matches the fetch stage above, which already uses `set -eux`.
… the image The base.name label said alpine:3.23 while both FROM lines are 3.24, so anything reading the label for provenance — SBOM tooling, scanners — got the wrong base. PYTHONDONTWRITEBYTECODE was set only on the entrypoint's two exec paths, so it was unset for anything else: `docker exec ... delete` runs python through the symlink in /usr/local/bin without it. Measured, nothing is actually written there today, because compileall bakes valid bytecode at build and the interpreter has no reason to rewrite it — this closes the gap rather than fixing a live fault, and makes the property hold at the image level as the comment above the build step already claims.
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Ports the container-ownership patterns already applied elsewhere, so
/appis never written to at runtime.Three things were writing into the application directory
HOME=/appon both exec paths. Any library writing a dotfile or cache landed in the app dir — and in rootless mode/appis not writable by the supplied uid at all, so it would fail rather than just be untidy.HOMEis now/config, which is the volume. Nothing in the app readsHOME(checked forexpanduser,Path.home,environ['HOME']), so this only moves where libraries put their own state.Python bytecode.
.pycwas written next to the source. Now compiled at build, withPYTHONDONTWRITEBYTECODE=1on both exec paths to stop runtime writes.chmod -R a+rX /appre-materialised the whole tree in its own layer to assert a property theCOPYs already satisfy. Replaced by a build-time assertion that fails loudly if anything under/appis not world-readable and traversable — free, and it catches a regression at build time instead of at run time.And the /config chown is now conditional
Touches only what is actually wrong. An already-correct tree costs a stat pass instead of rewriting every inode on every start.
Verified by building and running
Built and run with
PUID=1000/PGID=1000— deliberately not the image's defaults:/appis0:0in the image and stays that way; nothing chowns it.pyccount 2 → 2 across a full startup: no runtime bytecode/app/configcorrectly1000:1000restarts=0, clean startup log through to "Setup mode — container is idle"The assertion uses octal perm masks (
-perm -0004/-perm -0001) rather than the symbolic form, which is the portable spelling across GNU and busyboxfind.One thing worth a follow-up
The rootless and root exec paths now repeat the same three env assignments, so they are two sites that have to stay in step. A shared variable would keep them from drifting. Left out of this diff deliberately to keep it to the ownership change.
Summary by CodeRabbit
Bug Fixes
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