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#!/usr/bin/env bash
# git-worktree-gate — one definition of safe Git state for startup and wrap.
#
# Modes:
# strict [DIR] Require an entirely empty worktree.
# sync-safe [DIR] Permit untracked inbox/ deliveries, but nothing else.
# certify [DIR] Strict-check, then record the verified HEAD in the git dir.
# verify [DIR] Strict-check and require the recorded HEAD to still match.
#
# Ignored files are deliberately outside Git's clean-worktree contract.
set -u
mode="${1:-}"
repo="${2:-.}"
usage() {
echo "usage: git-worktree-gate {strict|sync-safe|certify|verify} [DIR]" >&2
exit 2
}
case "$mode" in
strict|sync-safe|certify|verify) ;;
*) usage ;;
esac
root="$(git -C "$repo" rev-parse --show-toplevel 2>/dev/null)" || {
echo "git-worktree-gate: $repo is not inside a Git worktree" >&2
exit 2
}
gitdir="$(git -C "$root" rev-parse --absolute-git-dir 2>/dev/null)" || {
echo "git-worktree-gate: cannot resolve the Git directory for $root" >&2
exit 2
}
certificate="$gitdir/ai-wrap-clean"
quote_path() {
printf '%q' "$1"
}
operation_in_progress() {
local marker
for marker in MERGE_HEAD CHERRY_PICK_HEAD REVERT_HEAD BISECT_LOG; do
[ -e "$gitdir/$marker" ] && {
printf '%s' "$marker"
return 0
}
done
for marker in rebase-merge rebase-apply sequencer; do
[ -d "$gitdir/$marker" ] && {
printf '%s' "$marker"
return 0
}
done
return 1
}
describe_entry() {
local xy="$1" path="$2" original="${3:-}"
local index="${xy:0:1}" worktree="${xy:1:1}" label=""
if [ "$xy" = "??" ]; then
label="untracked; add and commit it, move it outside the repository, or remove it if unwanted"
elif [ "$xy" = "!!" ]; then
label="ignored"
elif [[ "$xy" = *U* || "$xy" = "AA" || "$xy" = "DD" ]]; then
label="unmerged; resolve the conflict and commit the result"
elif [ "$index" != " " ] && [ "$worktree" != " " ]; then
label="staged and unstaged changes; review both layers, then commit or restore them"
elif [ "$index" != " " ]; then
label="staged change; commit it or unstage and restore it"
else
label="unstaged tracked change; commit it or restore it"
fi
printf ' %s ' "$xy"
quote_path "$path"
if [ -n "$original" ]; then
printf ' (from '
quote_path "$original"
printf ')'
fi
printf ' — %s\n' "$label"
}
check_state() {
local policy="$1" xy path original="" blocked=0 op=""
local status_tmp="" status_err="" status_detail=""
local -a report=()
if op="$(operation_in_progress)"; then
report+=(" Git operation in progress: $op — finish or abort it")
blocked=1
fi
status_tmp="$(mktemp "$gitdir/ai-worktree-status.tmp.XXXXXX")" || {
echo "wrap blocked: cannot allocate a Git-state check file" >&2
return 1
}
status_err="$(mktemp "$gitdir/ai-worktree-status.err.XXXXXX")" || {
rm -f "$status_tmp"
echo "wrap blocked: cannot allocate a Git-state error file" >&2
return 1
}
if ! git -C "$root" status --porcelain=v1 -z \
--untracked-files=all --ignore-submodules=none \
>"$status_tmp" 2>"$status_err"; then
status_detail="$(head -1 "$status_err")"
[ -n "$status_detail" ] || status_detail="unknown Git error"
report+=(" git status failed — $status_detail")
blocked=1
else
while IFS= read -r -d '' entry; do
xy="${entry:0:2}"
path="${entry:3}"
original=""
if [[ "${xy:0:1}" = "R" || "${xy:0:1}" = "C" ]]; then
IFS= read -r -d '' original || true
fi
if [ "$policy" = "sync-safe" ] \
&& [ "$xy" = "??" ] \
&& [[ "$path" = inbox/* ]]; then
continue
fi
report+=("$(describe_entry "$xy" "$path" "$original")")
blocked=1
done <"$status_tmp"
fi
rm -f "$status_tmp" "$status_err"
if [ "$blocked" -ne 0 ]; then
if [ "$policy" = "sync-safe" ]; then
echo "sync blocked: rulesets has changes other than untracked inbox deliveries" >&2
else
echo "wrap blocked: Git worktree is not completely clean" >&2
fi
printf '%s\n' "${report[@]}" >&2
return 1
fi
return 0
}
case "$mode" in
strict)
check_state strict
;;
sync-safe)
check_state sync-safe
;;
certify)
check_state strict || exit 1
head="$(git -C "$root" rev-parse HEAD 2>/dev/null)" || {
echo "wrap blocked: cannot resolve HEAD" >&2
exit 1
}
tmp="$(mktemp "$gitdir/ai-wrap-clean.tmp.XXXXXX")" || exit 1
chmod 600 "$tmp"
{
printf 'head=%s\n' "$head"
printf 'root=%s\n' "$root"
} >"$tmp"
mv "$tmp" "$certificate"
;;
verify)
check_state strict || exit 1
[ -f "$certificate" ] || {
echo "wrap blocked: no clean-tree certificate exists; rerun the final wrap verification" >&2
exit 1
}
certified_head="$(sed -n 's/^head=//p' "$certificate" | head -1)"
certified_root="$(sed -n 's/^root=//p' "$certificate" | head -1)"
current_head="$(git -C "$root" rev-parse HEAD 2>/dev/null)" || exit 1
[ "$certified_root" = "$root" ] || {
echo "wrap blocked: clean-tree certificate belongs to a different worktree" >&2
exit 1
}
[ -n "$certified_head" ] && [ "$certified_head" = "$current_head" ] || {
echo "wrap blocked: HEAD changed after clean-tree certification; rerun the final wrap verification" >&2
exit 1
}
;;
esac
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