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fix(worker): let a tag-only upgrade take a new socket proxy policy in one step - #699
A self-hoster who pins image tags and keeps their own compose file never gets a new socket proxy policy. Renovate (or a manual tag bump) moves the images, but the policy lives in the compose file, so the worker logs that the proxy's policy "is not the one this worker image expects" and stops there. Its advice was to replace the whole compose file, which someone with their own compose file (their own volumes, networks, env) won't do.
Updating such a setup by hand turned up a second bug. After the policy block and CASHPILOT_PROXY_POLICY were updated, docker compose up -d recreated the worker but not the proxy. Compose does not recreate a container when only a config's inline content changes (reproduced on Compose 2.40.3 and 5.5.1). So the proxy kept enforcing the old policy, and the worker's fingerprint check said everything was current.
Fix
The proxy carries the fingerprint too. Each shipped compose file now gives cashpilot-socket-proxy the same CASHPILOT_PROXY_POLICY line as the worker. A policy change now changes the proxy's environment, so docker compose up -d recreates it on the new policy. scripts/socket_proxy_policy.py already rewrites every occurrence.
The image can update just the policy of your own compose file.python -m app.socket_policy reads a compose file on stdin and writes it back with this release's policy block and fingerprints. Nothing else changes:
A file from before the proxy carried the fingerprint gets that line in the proxy's environment, so the next policy change recreates the proxy too. A CasaOS file keeps its two $ interpolation passes (detected from the block; when the block has no $ to tell, the filter asks for --passes 1 or --passes 2). Only real - CASHPILOT_PROXY_POLICY= entries are rewritten, whole values only; comments stay as they were. The filter refuses a file without the policy markers or the proxy's environment, and you read the diff before using the new file.
The warning says exactly what to do. The worker log, the worker status page and the dashboard's update card now name the release the image needs, the command above for that exact version, docker compose up -d --force-recreate cashpilot-socket-proxy cashpilot-worker (which also works for a compose file without the new proxy line), and the link to that release's compose file for anyone who would rather copy the block by hand.
What I rejected and why
Ship the policy in the image and have the proxy load it (a shared volume, an init container from the worker image, or a sidecar). The policy exists to limit what the worker image can do with the Docker socket. If the image supplies its own policy, a compromised or hijacked image tag widens its own limits on the next pull, and a Renovate auto-bump would apply that with nobody reading it. The policy stays in the operator's file. The image can only print a suggested file, with no mounts and no network.
Let the worker rewrite the compose file itself (it can bind the compose folder for the in-app update). Same problem: the restricted party would edit its own restrictions.
Have the worker read the proxy's loaded policy. The proxy's container is outside the worker's owner scope, by design, so the worker cannot inspect it. The fingerprint on the proxy's own environment closes the same gap without widening that scope.
The system stays fail-closed: a stale policy still refuses anything it doesn't allow, and nothing here loosens a rule.
Evidence
tests/test_socket_proxy.py:
every shipped compose file gives the proxy the current fingerprint;
the filter turns an older release's compose file into the shipped one, byte for byte, with and without the proxy's fingerprint line, CasaOS included, and keeps the operator's own lines;
the filter refuses a file without the markers or without the proxy's environment;
the fix names the release, the version-pinned image, the recreate command and the URL, with latest and main for a dev, latest or custom build;
no fix appears when the policy is current or the worker isn't behind the proxy.
scripts/proxy_policy_card_check.mjs (added to CI) runs the real renderUpdateCard. It checks that the note shows only when stale, that the commands arrive escaped, and that a worker can't plant a javascript: link: only a link into this repository becomes clickable.
Mutants, each one caught:
drop the proxy's fingerprint line;
the filter keeps the old fingerprint;
the filter exits 0 without markers;
the fix is offered when the policy is current;
a dev build names the image :dev;
the recreate command drops the proxy;
the card links any URL;
the card never renders the note;
CasaOS loses its second $ pass;
an old file gets no proxy fingerprint;
a file without a proxy environment is accepted;
a latest build is treated as a release;
--passes is ignored.
A real image built from this branch, run on the v2.0.6 docker-compose.worker.yml, changed the fingerprint and the two #665 lines, and added the proxy's fingerprint. The resulting block is identical to this release's, docker compose config accepts the file, and running the filter again changes nothing. The CasaOS template with an old policy comes back byte for byte. A file without markers exits 1 with nothing on stdout.
Compose recreate behaviour, on a minimal stack with an inline config: a content-only change leaves the old container and the old file in place (2.40.3 and 5.5.1); changing the fingerprint in the environment recreates it with the new file.
Full suite and ruff pass.
CashPilot-Desktop
Nothing to port. Desktop has no socket proxy, no compose policy and no update card for it.
… one step
The policy lives in the operator's compose file, so an image bump never
changes it and the worker only warned. The worker image now rewrites
just the policy block of a compose file piped through it (no mounts, no
network), and the warning, the status page and the update card give that
command, the release it targets and the recreate that loads it.
The proxy also carries the fingerprint: Compose does not recreate a
container when only a config's content changes, so a new policy stayed
unloaded while the worker's check said it was current.
An older file has the fingerprint only on the worker, so after the
filter a later policy change would again leave the proxy on the old
one: the filter now adds the proxy's line. A CasaOS file keeps its two
interpolation passes, and a build tagged latest links main, not vlatest.
Reviewing files that changed from the base of the PR and between 5c329c0 and aa0233a.
Files selected for processing: 3
app/orchestrator.py
app/socket_policy.py
tests/test_socket_proxy.py
Walkthrough
The worker now provides a command to update the Compose socket-proxy policy while preserving unrelated content. Shipped Compose files include a policy fingerprint. Policy mismatch guidance appears in worker logs, status information, and the dashboard update card.
A stdin-to-stdout filter updates the marked Compose policy and proxy fingerprint. It supports one or two interpolation passes, preserves unrelated content, and reports invalid input or usage errors. Tests cover updates, missing markers, and missing proxy environment entries.
The worker provides release-specific policy repair instructions in logs, status information, and the update card. The card links only to URLs under the CashPilot GitHub repository and escapes other content. Tests and documentation cover the repair flow.
GeiserX/CashPilot#665: Changes the socket-proxy policy and fingerprint that this PR uses when detecting and rewriting policy mismatches.
GeiserX/CashPilot#598: Changes the policy rules and fingerprint, and updates the upgrade guidance and tests that this PR also modifies.
GeiserX/CashPilot#607: Adds the CasaOS and Runtipi Compose files that this PR supports in its policy rewrite flow.
Merge Risk: Low · previous review 5c329
The updater has edge cases that alter unrelated content, duplicate fingerprints, or produce incorrect CasaOS escaping. Custom builds can also receive unusable repair commands and links. Mergeability risk is low, with these limitations requiring fixes or explicit acceptance.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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The title "fix(worker): let a tag-only upgrade take a new socket proxy policy in one step" matches the main change. The PR adds a policy-update flow in which the worker reports a mismatch and provides…
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Explanation
The title "fix(worker): let a tag-only upgrade take a new socket proxy policy in one step" matches the main change. The PR adds a policy-update flow in which the worker reports a mismatch and provides commands to update only the policy block in the operator's Compose file, and the fingerprint is added so Compose recreates the proxy. The title is specific and concise. It names the worker and the socket proxy policy. The phrase "tag-only upgrade" and "in one step" are a little narrower than the objectives, which describe a Compose-file filter and guidance across the log, status page, and dashboard card. That gap is minor.
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…ronment
A fingerprint elsewhere in the file (a comment, a second worker) made
the filter skip the proxy's line, so the proxy could again stay on an
old policy.
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Actionable comments posted: 4
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @app/orchestrator.py:
- Around line 211-233: Update proxy_policy_fix to distinguish published releases
from custom CASHPILOT_VERSION values; do not rely on version.is_release alone if
it accepts custom strings. For custom builds, use the running worker image in
the command and avoid constructing a Git release URL from the custom version;
preserve tagged image and URL references for confirmed published releases.
Review comments at @app/socket_policy.py:
- Around line 253-271: Update DIGEST_RE and its use in render to match only the
CASHPILOT_PROXY_POLICY environment assignments for the intended worker and proxy
services, excluding comments and other services. Replace each assignment’s
complete value with the fingerprint so any trailing characters cannot remain,
while preserving unrelated text.
- Around line 285-304: Update _env_list to search across blank lines when
determining the proxy environment list, so fingerprint detection finds existing
entries separated from the anchor by blank lines and avoids inserting
duplicates. Preserve the existing list-entry and comment matching behavior.
- Around line 316-318: Update the `passes` inference so that when no explicit
`--passes` value is provided and the existing policy block does not reveal the
pass count, the command requires an explicit count instead of defaulting to
single-pass escaping. Preserve the existing inference when the block contains
`$$$$`.
---
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…es are unclear
The filter replaced CASHPILOT_PROXY_POLICY= anywhere, comments and partial
values included; it now rewrites whole list entries only. The proxy's
environment list runs past blank lines, a block with no $ asks for
--passes, and only a plain X.Y.Z version names a release.
❌ Patch coverage is 95.34884% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.99%. Comparing base (5eb2315) to head (aa0233a). ⚠️ Report is 1 commits behind head on main.
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Problem
A self-hoster who pins image tags and keeps their own compose file never gets a new socket proxy policy. Renovate (or a manual tag bump) moves the images, but the policy lives in the compose file, so the worker logs that the proxy's policy "is not the one this worker image expects" and stops there. Its advice was to replace the whole compose file, which someone with their own compose file (their own volumes, networks, env) won't do.
Updating such a setup by hand turned up a second bug. After the policy block and
CASHPILOT_PROXY_POLICYwere updated,docker compose up -drecreated the worker but not the proxy. Compose does not recreate a container when only a config's inlinecontentchanges (reproduced on Compose 2.40.3 and 5.5.1). So the proxy kept enforcing the old policy, and the worker's fingerprint check said everything was current.Fix
The proxy carries the fingerprint too. Each shipped compose file now gives
cashpilot-socket-proxythe sameCASHPILOT_PROXY_POLICYline as the worker. A policy change now changes the proxy's environment, sodocker compose up -drecreates it on the new policy.scripts/socket_proxy_policy.pyalready rewrites every occurrence.The image can update just the policy of your own compose file.
python -m app.socket_policyreads a compose file on stdin and writes it back with this release's policy block and fingerprints. Nothing else changes:A file from before the proxy carried the fingerprint gets that line in the proxy's environment, so the next policy change recreates the proxy too. A CasaOS file keeps its two
$interpolation passes (detected from the block; when the block has no$to tell, the filter asks for--passes 1or--passes 2). Only real- CASHPILOT_PROXY_POLICY=entries are rewritten, whole values only; comments stay as they were. The filter refuses a file without the policy markers or the proxy's environment, and you read the diff before using the new file.The warning says exactly what to do. The worker log, the worker status page and the dashboard's update card now name the release the image needs, the command above for that exact version,
docker compose up -d --force-recreate cashpilot-socket-proxy cashpilot-worker(which also works for a compose file without the new proxy line), and the link to that release's compose file for anyone who would rather copy the block by hand.What I rejected and why
The system stays fail-closed: a stale policy still refuses anything it doesn't allow, and nothing here loosens a rule.
Evidence
tests/test_socket_proxy.py:latestandmainfor adev,latestor custom build;scripts/proxy_policy_card_check.mjs(added to CI) runs the realrenderUpdateCard. It checks that the note shows only when stale, that the commands arrive escaped, and that a worker can't plant ajavascript:link: only a link into this repository becomes clickable.:dev;$pass;latestbuild is treated as a release;--passesis ignored.docker-compose.worker.yml, changed the fingerprint and the two#665lines, and added the proxy's fingerprint. The resulting block is identical to this release's,docker compose configaccepts the file, and running the filter again changes nothing. The CasaOS template with an old policy comes back byte for byte. A file without markers exits 1 with nothing on stdout.ruffpass.CashPilot-Desktop
Nothing to port. Desktop has no socket proxy, no compose policy and no update card for it.