tmu
dc57529f0f
`main` tracks `origin` (ssh); the comment claiming it tracked an https companion remote was stale.
125 lines
4.3 KiB
Bash
Executable File
125 lines
4.3 KiB
Bash
Executable File
#!/bin/sh
|
|
|
|
set -eu
|
|
|
|
# Branch front-door. Run as `npm run create:branch -- <prefix>/<desc>`.
|
|
#
|
|
# Asserts the branch preconditions — clean tree, no in-progress operation,
|
|
# current `main`, green baseline — and only then creates the branch, so the
|
|
# expensive `npm run test` is not paid on a tree that was never eligible.
|
|
#
|
|
# Why the front door exists, the rejected prefix names, and the `create:`
|
|
# decision: development/workflow.md § Branching model and § Script prefix
|
|
# convention.
|
|
|
|
BASE="main"
|
|
PREFIXES="feature fix chore"
|
|
NAME="${1:-}"
|
|
|
|
if [ -z "${NAME}" ]; then
|
|
echo "usage: npm run create:branch -- <prefix>/<desc> (prefix: ${PREFIXES})" >&2
|
|
exit 2
|
|
fi
|
|
|
|
git rev-parse --is-inside-work-tree >/dev/null 2>&1 || {
|
|
echo "error: not inside a git work tree." >&2
|
|
exit 1
|
|
}
|
|
|
|
MATCH=0
|
|
for p in ${PREFIXES}; do
|
|
case "${NAME}" in
|
|
"${p}/"*) MATCH=1 ;;
|
|
esac
|
|
done
|
|
if [ "${MATCH}" -ne 1 ]; then
|
|
echo "error: '${NAME}' must start with one of: ${PREFIXES}." >&2
|
|
echo " the prefix is inferred from the task, not defaulted here." >&2
|
|
exit 1
|
|
fi
|
|
git check-ref-format --branch "${NAME}" >/dev/null 2>&1 || {
|
|
echo "error: '${NAME}' is not a valid branch name." >&2
|
|
exit 1
|
|
}
|
|
git show-ref --verify --quiet "refs/heads/${NAME}" && {
|
|
echo "error: branch '${NAME}' already exists; switch to it instead." >&2
|
|
exit 1
|
|
}
|
|
|
|
START_REF=$(git symbolic-ref --quiet --short HEAD || true)
|
|
if [ -z "${START_REF}" ]; then
|
|
echo "error: detached HEAD; switch to a branch first." >&2
|
|
exit 1
|
|
fi
|
|
|
|
STATE_ROOT=$(git rev-parse --absolute-git-dir)
|
|
for state in MERGE_HEAD rebase-merge rebase-apply CHERRY_PICK_HEAD BISECT_LOG; do
|
|
[ -e "${STATE_ROOT}/${state}" ] && {
|
|
echo "error: a '${state}' operation is in progress; finish or abort it first." >&2
|
|
exit 1
|
|
}
|
|
done
|
|
# `--porcelain` is deliberately stricter than `git diff --quiet`: it also reports
|
|
# untracked files, which would otherwise ride silently onto the new branch.
|
|
DIRTY=$(git status --porcelain)
|
|
if [ -n "${DIRTY}" ]; then
|
|
echo "error: working tree is not clean:" >&2
|
|
echo "${DIRTY}" | sed 's/^/ /' >&2
|
|
exit 1
|
|
fi
|
|
|
|
git show-ref --verify --quiet "refs/heads/${BASE}" || {
|
|
echo "error: no local '${BASE}' to branch from." >&2
|
|
exit 1
|
|
}
|
|
|
|
# Derive the remote rather than hardcoding it: `main` tracks `origin` (ssh)
|
|
# here; a hardcoded name would check currency against a ref that may not
|
|
# exist on a differently configured clone.
|
|
# `--quiet` echoes the unresolved `main@{upstream}` literal to stdout on
|
|
# failure, so it cannot be paired with a `$(...) || fallback`; the non-quiet
|
|
# form prints nothing on failure and the fallback runs.
|
|
UPSTREAM=$(git rev-parse --abbrev-ref --symbolic-full-name "${BASE}@{upstream}" 2>/dev/null) || UPSTREAM=""
|
|
if [ -n "${UPSTREAM}" ]; then
|
|
git fetch --quiet "${UPSTREAM%/*}" "${UPSTREAM#*/}" || {
|
|
echo "error: '${UPSTREAM}' check failed: could not reach '${UPSTREAM%/*}'." >&2
|
|
echo " refusing to branch on a possibly stale '${BASE}'." >&2
|
|
exit 1
|
|
}
|
|
# Only *behind* is a problem. `create:finish` deliberately leaves the local
|
|
# merge on '${BASE}' until `create:release` pushes it, so being ahead is the
|
|
# normal state between a merge and the release that ships it; branching from
|
|
# those commits is intended. Missing remote commits is not.
|
|
BEHIND=$(git rev-list --count "${BASE}..${UPSTREAM}")
|
|
if [ "${BEHIND}" -ne 0 ]; then
|
|
echo "error: '${BASE}' is behind '${UPSTREAM}' (by ${BEHIND})." >&2
|
|
echo " update it: git switch ${BASE} && git pull --ff-only" >&2
|
|
exit 1
|
|
fi
|
|
else
|
|
echo "warning: '${BASE}' has no upstream; freshness against the remote is unchecked." >&2
|
|
fi
|
|
|
|
restore() {
|
|
git switch --quiet "${START_REF}" 2>/dev/null || true
|
|
}
|
|
trap 'restore' EXIT HUP INT TERM
|
|
|
|
if [ "${START_REF}" != "${BASE}" ]; then
|
|
git switch --quiet "${BASE}"
|
|
fi
|
|
|
|
echo "Baseline: npm run test"
|
|
if ! npm run --silent test; then
|
|
echo "error: baseline is red on '${BASE}'; fix that first so later failures stay attributable." >&2
|
|
exit 1
|
|
fi
|
|
|
|
git switch --quiet --no-track -c "${NAME}"
|
|
trap - EXIT HUP INT TERM
|
|
|
|
# push.default=upstream is set here, so an inherited upstream would make a bare
|
|
# `git push` target main. Branching local-from-local does not set one anyway;
|
|
# --no-track says so out loud.
|
|
echo "Created ${NAME} from ${BASE} $(git rev-parse --short "${BASE}")."
|