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🐋🔧：fix the container's hang and its moving pins - #1894
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Ported from OpenINF/.github, where this landed as bccd6d2 and 966b995. Depends on `verify.runtimes` being present, so it wants landing after the branch that adds it. post-create.sh calls that task rather than repeating the comparison: stated twice it would be two rules, and the one nobody runs is the one that rots. Three things here are defects rather than wording. post-create.sh left stdin open when it installed fisher. postCreateCommand hands the script a pipe that never delivers, fisher fetches in background jobs and then `wait`s, and with no job control a child that reads that pipe stops and the wait never returns. It hung container creation for ten minutes at 0% CPU. Closed, the same install takes 0.7s. The curl is bounded as well, so a stalled connection cannot imitate the same symptom. fisher and nvm.fish were pinned by tag. This is remote code piped into a shell, and a tag is a name its owner can move, so they are pinned by commit now -- written the way the workflows pin actions, immutable ref with the version as a trailing comment. Both SHAs were checked against the tags they claim. .renovaterc.json5 has to learn the new shape or it silently stops tracking them, so its matcher captures both halves; verified it still matches, and both pins still resolve. post-start.sh counted the forwarded agent's identities with `^ssh-`, which does not match ECDSA or security keys, and only looked at all when the key file was absent -- so a session that forwarded a different identity kept the old one. It now matches by key type, re-reads on every attach, and keeps rather than deletes a file it could not re-verify, since that file cannot mis-sign: the signature goes through the agent by fingerprint. `mkdir -p -m 700` is split into mkdir and chmod because -m applies only to the deepest directory (SC2174). The Dockerfile keeps its own prose and its own digest, which renovate manages; it gains only the hadolint pragma beside the skipcq one, since the two tools each read only their own. devcontainer.json is already a superset of the upstream file once comments are set aside, so it is left alone. Signed-off-by: Derek Lewis <DerekNonGeneric@inf.is> Assisted-by: Claude-Code:claude-opus-5
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Included review availability: Your plan provides up to 8 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe devcontainer now validates pinned runtime declarations, hardens fish tooling installation, filters forwarded SSH identities, updates Renovate parsing, and recognizes ChangesDevcontainer runtime and SSH identity updates
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The devcontainer now selects only one supported SSH signing identity, including when certificates are offered, preventing invalid signing-key output. No current merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In @.devcontainer/post-start.sh:
- Line 43: Update the identity-writing logic in the count-equals-one branch to
write only the matched identity line to container_signingkey, rather than the
full identities output, and reuse that same matched line for allowed_signers.
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.devcontainer/Dockerfile.devcontainer/post-create.sh.devcontainer/post-start.sh.renovaterc.json5project-terms.txt
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Review catch on the ported post-start.sh: the count and the thing
written were not the same list.
`count` is how many of `ssh-add -L`'s lines look like a key type this
accepts. The file was then written from `identities`, which is every
line the agent offered. An agent forwarding a certificate alongside the
key it belongs to prints two lines and matches one -- the certificate
is `ssh-ed25519-cert-v01@openssh.com`, deliberately not an accepted
type -- so the guard would pass and write both.
Two keys in the file breaks both readers of it. `ssh-keygen -Y sign -f`
wants one public key, and allowed_signers gets its second field from
`awk '{print $1, $2}'` over the whole file, which becomes a second line
in a grammar that has room for none.
The matching lines are kept now and the count taken from those, so what
is counted is what is written.
Checked against a single key, a key plus its certificate, two real
keys, an ECDSA key, and "The agent has no identities.": one line
written in the first, second and fourth, and a refusal in the others.
Signed-off-by: Derek Lewis <DerekNonGeneric@inf.is>
Assisted-by: Claude-Code:claude-opus-5
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Good catch — this one was real, and fixed in d994009. The count and the thing written were not the same list. Two keys in that file breaks both readers of it: The matching lines are kept now and the count taken from those, so what is counted is what is written. Checked across five cases:
Worth noting this defect is also in |
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Ported from
OpenINF/.github, where this landed asbccd6d2and966b995.Three things here are defects rather than wording.
The container creation hang
post-create.shleft stdin open when it installed fisher.postCreateCommandhands the script a pipe that never delivers, fisher fetches in background jobs and thenwaits, and with no job control a child that reads that pipe stops and the wait never returns. It hung container creation for ten minutes at 0% CPU. Closed with</dev/null, the same install takes 0.7s. The curl is bounded as well (--connect-timeout 10 --max-time 120), so a stalled connection cannot imitate the same symptom.The nvm.fish preinstall also stops being silenced by
|| true. It is genuinely non-fatal — it only duplicates, for fish, a version the container already has — but it has to say so, or a barenvm useis broken there with nothing to explain why.Pins that could move
fisher and nvm.fish were pinned by tag. This is remote code piped into a shell, and a tag is a name its owner can move, so they are pinned by commit now — written the way the workflows pin actions, immutable ref with the version as a trailing comment.
.renovaterc.json5has to learn the new shape or it silently stops tracking them, so its matcher captures both halves. Both are verified below.Commit signing across sessions
post-start.shcounted the forwarded agent's identities with^ssh-, which does not match ECDSA or security keys, and only looked at all when the key file was absent — so a session that forwarded a different identity kept the old one. It now matches by key type, re-reads on every attach, and keeps rather than deletes a file it could not re-verify, since that file cannot mis-sign: the signature goes through the agent by fingerprint, so a stale file yields "no matching identity" rather than someone else's signature.mkdir -p -m 700is split intomkdirandchmodbecause-mapplies only to the deepest directory (SC2174).What is deliberately left alone
devcontainer.jsonis already a strict superset of the upstream file once comments are set aside — the java and git-lfs features,forwardPorts, and the Shopify extension are all yours. Untouched.fish-apt-getalternative, which upstream's does not) and its own digest, which renovate manages. It gains only thehadolint ignore=DL3008pragma beside theskipcqone, since the two tools each read only their own.How it was checked
a04308breally is fisher4.4.8,abd3002really is nvm.fish2.2.17.post-create.sh: two matches, withdatasource,depName,currentDigestandcurrentValueall captured correctly.bash -nandsh -nclean on both scripts; both keep mode 755.verify.spellingneedednistpinproject-terms.txt(from the ECDSA key-type pattern); added, and clean after.verify.all.Ordering
Land after "check the runtime pins still agree" (#1888).
post-create.shhere callsverify.runtimesrather than repeating the comparison, so that task needs to exist first.Summary by CodeRabbit
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