fix(ci): prefix PR container tags to prevent overwriting release tags - #93
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WalkthroughThe PR workflow now prefixes the sanitized head ref with the pull request number when it generates a container tag. The sanitized ref is truncated to 120 characters. ChangesPR Container Tag
Priority: ➖ Normal Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Bug fix Merge Risk: 🔵 Low · up to The build is mergeable, but a long branch name on a PR numbered 10000 or higher can produce an invalid tag and fail that PR’s image build. Shorten the ref based on the prefix length before this case occurs. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Copilot review overview
🟡 Changes recommended
Five-digit PR numbers can make the generated tag exceed Docker’s 128-character limit.
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Review effort: Balanced
Findings: 1
Open (1)
What changed in this PR
Prefixes PR container tags with PR numbers to avoid collisions with release tags.
Changes:
- Adds PR numbers to image tags.
- Sanitizes and truncates branch names.
| File | Description |
|---|---|
.github/workflows/ko-build-branch.yaml |
Generates PR-specific container tags. |
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @.github/workflows/ko-build-branch.yaml:
- Line 43: Update the `sanitized_ref` truncation before assigning
`container_tag` so its limit is calculated as 128 minus the length of the
`pr-${PR_NUMBER}-` prefix; preserve the complete prefix and ensure the assembled
tag never exceeds 128 characters.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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.github/workflows/ko-build-branch.yaml
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The pull_request-triggered branch build tagged images using only the
sanitised branch name (e.g. "latest", "development"), so a PR opened
from a branch named after a production tag could silently overwrite it
in GHCR. Prefix every PR image tag with pr-<number>- so it can never
collide with a release/main tag, and trim the sanitised branch segment
to 128 - len("pr-<number>-") chars so the total tag always fits within
the 128-character Docker/OCI tag length limit.
See linuxfoundation/lfx-self-serve-ops#75.
Signed-off-by: Andres Tobon <andrest2455@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
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@andrest50 I'm starting review 1 of this pull request now (started 2026-09-25 20:12 UTC). This usually takes a few minutes — I'll update this comment with the summary when I'm done. |
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@andrest50 I'm starting review 2 of this pull request now (started 2026-09-25 20:27 UTC). This usually takes a few minutes — I'll update this comment with the summary when I'm done. Hi @andrest50 👋 thanks for re-opening this with a DCO-signed commit. Overall impression: This is a tight, well-scoped fix for lfx-self-serve-ops#75. Every PR image tag is now namespaced as Issues:
AI bot reconciliation: Copilot (comment) and CodeRabbit (comment) both flagged that a fixed 120-char trim would overflow 128 characters once the PR number reaches 5 digits. I agree, and the current head resolves it; both bots have since confirmed it resolved. Final decision: ✅ Approved with minor comments |
dealako
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dealako
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✅ Approved with minor comments. The pr-<number>- prefix removes the release-tag overwrite path, and the dynamic trim keeps every tag at 128 characters or fewer. One optional nit is inline. See the review summary for details.
| PR_NUMBER: "${{ github.event.pull_request.number }}" | ||
| run: | | ||
| container_tag=$(echo "$HEAD_REF" | sed 's/[^_0-9a-zA-Z]/-/g' | cut -c -127) | ||
| sanitized_ref=$(echo "$HEAD_REF" | sed 's/[^_0-9a-zA-Z]/-/g' | cut -c -$((124 - ${#PR_NUMBER}))) |
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[nit] Document the 124 - ${#PR_NUMBER} trim
Issue: The trim length is a magic number with no comment tying it to Docker's 128-character tag limit.
Proof: cut -c -$((124 - ${#PR_NUMBER})) works because the prefix pr-${PR_NUMBER}- is 4 + len(PR_NUMBER) characters, so the tag tops out at exactly 128. But that arithmetic isn't visible here, and the PR description still says the segment is "trimmed to 120 chars".
Why it matters: A future maintainer reading the PR history could "simplify" this back to a fixed 120, which reintroduces tags longer than 128 characters (and failed ko build runs) once PR numbers reach 5 digits.
Fix: Add a one-line comment above the step's script, e.g.
# Docker tags max out at 128 chars; "pr-" + PR_NUMBER + "-" uses 4 + len(PR_NUMBER).
sanitized_ref=$(echo "$HEAD_REF" | sed 's/[^_0-9a-zA-Z]/-/g' | cut -c -$((124 - ${#PR_NUMBER})))Optionally update the PR description to match.
fix(ci): prefix PR container tags to prevent overwriting release tags
Problem
PR-triggered branch builds were tagging container images using only the sanitised branch name (e.g.
latest,development). A PR opened from a branch named after a production tag could silently overwrite that tag in GHCR.Tracked in: linuxfoundation/lfx-self-serve-ops#75
Fix
Every PR image tag is now prefixed with
pr-<number>-so it can never collide with a release or main-branch tag. The sanitised branch segment is trimmed to 120 chars to stay within the Docker tag length limit.Why this replaces the Backstage PR
The original Fleetshift bot PR was force-pushed to add a missing DCO
Signed-off-bytrailer, which inadvertently caused Fleetshift to detect the branch tampering and auto-close the PR. This replacement PR contains the same workflow change with a proper DCO-signed commit.Made with Cursor