git-submodule-purge

#!/bin/sh
#
# git-submodule-purge - purges the copies of obsoleted submodule repositories
#
# Copyright (c) 2012 Akinori MUSHA
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

main () {
    if [ ! -d .git ]; then
        echo 'You need to run this command from the toplevel of the working tree.' >&2
        exit 1
    fi

    [ -d .git/modules ] || return 0

    repodir=`pwd -L`/.git/modules
    git submodule foreach --quiet --recursive '
        [ -f .git ] && (while read -r key gitdir; do
            [ "$key" = "gitdir:" ] || continue
            cd -L -- "$gitdir" 2>/dev/null && pwd -L
            break
        done < .git) || :' |
    while read -r gitdir; do
        case "$gitdir" in
            "$repodir/"*)
                touch -- "$gitdir/.do_not_purge_me"
                ;;
        esac
    done

    find .git/modules -type f -name config -print |
    while read -r config; do
        gitdir="${config%/config}"
        if [ -f "$gitdir/.do_not_purge_me" ]; then
            rm -- "$gitdir/.do_not_purge_me"
            continue
        fi
        [ -f "$gitdir/index" -a -d "$gitdir/objects" ] || continue
        printf '%s\n' "$gitdir"
    done | sort -r |
    while read -r dir; do
        echo "Purging $dir"
        rm -rf -- "$dir"/*
        rmdir -p -- "$dir" 2>/dev/null || :
    done
}

main "$@"