#!/bin/sh
# Explicit installation only. Never edit core.hooksPath or overwrite a hook.
set -eu
repo=${1:-.}
source_dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
hook_dir=$(git -C "$repo" rev-parse --path-format=absolute --git-path hooks)
hook="$hook_dir/pre-push"
mkdir -p -- "$(dirname -- "$hook")"
# Resolve only the directory: Git canonicalizes a final hook symlink to its target.
# O_EXCL refuses every pre-existing final path, including dangling symlinks.
python3 - "$source_dir/pre-push" "$hook" <<'PY'
import os
import shutil
import sys
try:
    with open(sys.argv[1], 'rb') as source:
        fd = os.open(sys.argv[2], os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_NOFOLLOW, 0o755)
        with os.fdopen(fd, 'wb') as target:
            shutil.copyfileobj(source, target)
            os.fchmod(target.fileno(), 0o755)
except OSError:
    print('Installation refused: hook exists or cannot be created. See ops/README.md.', file=sys.stderr)
    sys.exit(1)
PY
printf 'Installed %s\n' "$hook"