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`hermes dump` and the startup banner both call `git rev-parse HEAD` to
report the running commit, but `.dockerignore` line 2 excludes `.git` —
so inside the published image `hermes dump` shows
`version: ... [(unknown)]` and the banner drops its `· upstream <sha>`
suffix entirely. That makes support triage from container bug reports
impossible: we can't tell which commit the user is actually running.
Fix: thread the build-time SHA through as a Docker build-arg, write it
to `/opt/hermes/.hermes_build_sha` in the image, and have a new
`hermes_cli/build_info.get_build_sha()` read it as a fallback after the
existing live-git lookup fails. Output format is unchanged in both
callsites — same 8-char short SHA whether resolved live or baked.
Wiring:
- Dockerfile: `ARG HERMES_GIT_SHA=` + write-file step after the source
copy. Empty/missing arg → no file written → callers fall through to
live git (so local `docker build` without --build-arg is unchanged).
- docker-publish.yml: passes `HERMES_GIT_SHA=${{ github.sha }}` on all
four build-push-action steps (amd64/arm64, smoke-test + final push).
- dump.py:_get_git_commit() / banner.py:get_git_banner_state(): try
live git first, fall back to baked SHA, then to legacy `(unknown)`
/ None. Banner returns `upstream == local, ahead=0` because a built
image is by definition pinned to one commit.
Coverage:
- Unit tests cover build_info (file present/absent/empty/error,
truncation, whitespace), dump (live-git wins, both fallbacks,
identical output-format regression guard), and banner (no-repo +
baked, no-repo + no-sha, shallow-clone fallback).
- tests/docker/test_dump_build_sha.py is an integration regression
guard that runs against the real image, reads
`/opt/hermes/.hermes_build_sha`, and asserts `hermes dump` surfaces
its content (or stays at `(unknown)` if no file).
- Verified end-to-end: `docker build --build-arg HERMES_GIT_SHA=abc...`
→ `docker run ... dump` reports `[abc12345]`; without the build-arg
it reports `[(unknown)]` as before.
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| .. | ||
| actions | ||
| ISSUE_TEMPLATE | ||
| workflows | ||
| dependabot.yml | ||
| PULL_REQUEST_TEMPLATE.md | ||