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prompts/script/docker
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Correct the build cache wording after review
REPO_POLICIES.md no longer says a Go test phase's image holds every
compiled package; with Go's build cache mounted, those stay in the
mount. The comments in script/lint, script/test, script/cibuild and
script/docker now say that a new CACHEBUST value reruns the RUN steps
only because every stage of the Dockerfile declares ARG CACHEBUST
first, and that a stage without the line is served from cache with no
warning. NEW_REPO_CHECKLIST.md tells a new repository to add the
scripts and every stage's ARG CACHEBUST line in the same commit, in
place of re-vendoring them.

Model: opus-5-5
2026-10-15 11:56:16 +00:00

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#!/bin/sh
# script/docker: build the Docker image tagged with the project name.
# Identical in all repos; the tag comes from script/projectname.
# A new CACHEBUST value reruns every RUN step, since a cached gate phase
# is a check that did not run; unlike --no-cache, it keeps Go's build cache.
# This relies on every stage of the Dockerfile declaring ARG CACHEBUST
# first; a stage without that line is served from cache on an unchanged
# tree, with no warning.
set -eu
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
ROOT="$(cd "$SCRIPT_DIR/.." && pwd -P)"
main() {
cd "$ROOT"
# The version and the tag each get their own line: a failing
# command substitution inside an argument does not trip `set -e`,
# so the inline form degrades silently to an empty constant. The
# VERSION build argument takes precedence over the version a build
# stage derives from the .git in the context.
version="$(git describe --tags --always --dirty 2>/dev/null || true)"
[ -n "$version" ] || version="unknown"
tag="$("$SCRIPT_DIR/projectname")"
docker build --build-arg CACHEBUST="$(date +%s)-$$" \
--build-arg VERSION="$version" \
-t "$tag" .
}
main "$@"