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Adopt the four remaining upstream CHECK_EPOCH hardening items from sneak/prompts #26, closing the gap #85 left open deliberately. Fail closed on a missing value. Each check stage now asserts `[ -n "$CHECK_EPOCH" ] || exit 1` before running anything. An unset ARG is an empty string and an empty string is a stable cache key, so the second and every later bare `docker build .` on an unchanged tree replayed all three check layers, executed nothing, and still exited 0 -- and `docker build .` is the command REPO_POLICIES.md names verbatim as a thing that must be green, so the documented command was precisely the one that lied. Failed steps are never cached, which is what makes the guard fire on every invocation rather than once. Expand the epoch into each check command rather than leaving it a bare declaration, so the cache miss does not depend on BuildKit's unreferenced-ARG handling staying as it is, and so the value appears in the build log where a reader can see the layer was keyed fresh. Make the epoch unique per invocation rather than per second: `epoch="$(date +%s%N)$$"`. `%N` alone is not enough, since busybox drops it silently and exits 0, handing back second granularity with no warning; `$$` differs between concurrent invocations regardless. The bare-assignment form is kept on purpose -- inlined into an argument, a failing substitution does not abort under `set -eu` and would yield an empty constant epoch, restoring the exact false green this prevents. Pass the same fresh value from script/docker. It is not the CI gate, but local builds are almost always warm, so it was the likelier fooling in practice, and two entrypoints disagreeing about whether the tree is green is worse than either being wrong alone. The ARG placement from #85 is unchanged, below apk add, COPY go.mod go.sum and go mod download, so dependency layers still cache and the build is not cold. Verified by negative control rather than inspection; measurements are recorded once, in the PR verification comment. .golangci.yml, the lint-stage FROM line and its digest, script/lint, REPO_POLICIES.md and .gitea/workflows/check.yml are untouched.
3.8 KiB
3.8 KiB