git/git-prune-script

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#!/bin/sh
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_DIR=.git}
: ${GIT_OBJECT_DIRECTORY="${SHA1_FILE_DIRECTORY-"$GIT_DIR/objects"}"}
git-fsck-cache --cache --unreachable "$@" |
sed -ne '/unreachable /{
s/unreachable [^ ][^ ]* //
s|\(..\)|\1/|p
}' | {
cd "$GIT_OBJECT_DIRECTORY" || exit
xargs -r $dryrun rm -f
}