#!/bin/sh
-REFS=$(cat .git/refs/*/*)
-[ "$REFS" ] || exit 1
-git-fsck-cache --unreachable $REFS | grep unreachable | cut -d' ' -f3 | sed 's:^\(..\):.git/objects/\1/:' | xargs -r rm
+
+. git-sh-setup-script || die "Not a git archive"
+
+dryrun=
+while case "$#" in 0) break ;; esac
+do
+ case "$1" in
+ -n) dryrun=echo ;;
+ --) break ;;
+ -*) echo >&2 "usage: git-prune-script [ -n ] [ heads... ]"; exit 1 ;;
+ *) break ;;
+ esac
+ shift;
+done
+
+git-fsck-cache --cache --unreachable "$@" |
+sed -ne '/unreachable /{
+ s/unreachable [^ ][^ ]* //
+ s|\(..\)|\1/|p
+}' | {
+ cd "$GIT_OBJECT_DIRECTORY" || exit
+ xargs -r $dryrun rm -f
+}
+