#!/bin/bash -
#
# File: git-archive-all.sh
#
# Description: A utility script that builds an archive file(s) of all
# git repositories and submodules in the current path.
# Useful for creating a single tarfile of a git super-
# project that contains other submodules.
#
# Examples: Use git-archive-all.sh to create archive distributions
# from git repositories. To use, simply do:
#
# cd $GIT_DIR; git-archive-all.sh
#
# where $GIT_DIR is the root of your git superproject.
 
# DEBUGGING
set -e
set -C # noclobber
 
# TRAP SIGNALS
trap 'cleanup' QUIT EXIT
 
# For security reasons, explicitly set the internal field separator
# to newline, space, tab
OLD_IFS=$IFS
IFS='
'
 
function cleanup () {
    rm -f $TMPFILE
    rm -f $TOARCHIVE
    IFS="$OLD_IFS"
}
 
function usage () {
    echo "Usage is as follows:"
    echo
echo "$PROGRAM <--version>"
    echo " Prints the program version number on a line by itself and exits."
    echo
echo "$PROGRAM <--usage|--help|-?>"
    echo " Prints this usage output and exits."
    echo
echo "$PROGRAM [--format <fmt>] [--prefix <path>] [--separate|-s] [output_file]"
    echo " Creates an archive for the entire git superproject, and its submodules"
    echo " using the passed parameters, described below."
    echo
echo " If '--format' is specified, the archive is created with the named"
    echo " git archiver backend. Obviously, this must be a backend that git-archive"
    echo " understands. The format defaults to 'tar' if not specified."
    echo
echo " If '--prefix' is specified, the archive's superproject and all submodules"
    echo " are created with the <path> prefix named. The default is to not use one."
    echo
echo " If '--separate' or '-s' is specified, individual archives will be created"
    echo " for each of the superproject itself and its submodules. The default is to"
    echo " concatenate individual archives into one larger archive."
    echo
echo " If 'output_file' is specified, the resulting archive is created as the"
    echo " file named. This parameter is essentially a path that must be writeable."
    echo " When combined with '--separate' ('-s') this path must refer to a directory."
    echo " Without this parameter or when combined with '--separate' the resulting"
    echo " archive(s) are named with a dot-separated path of the archived directory and"
    echo " a file extension equal to their format (e.g., 'superdir.submodule1dir.tar')."
}
 
function version () {
    echo "$PROGRAM version $VERSION"
}
 
# Internal variables and initializations.
readonly PROGRAM=`basename "$0"`
readonly VERSION=0.2
 
OLD_PWD="`pwd`"
TMPDIR=${TMPDIR:-/tmp}
TMPFILE=`mktemp "$TMPDIR/$PROGRAM.XXXXXX"` # Create a place to store our work's progress
TOARCHIVE=`mktemp "$TMPDIR/$PROGRAM.toarchive.XXXXXX"`
OUT_FILE=$OLD_PWD # assume "this directory" without a name change by default
SEPARATE=0
 
FORMAT=tar
PREFIX=
TREEISH=HEAD
 
# RETURN VALUES/EXIT STATUS CODES
readonly E_BAD_OPTION=254
readonly E_UNKNOWN=255
 
# Process command-line arguments.
while test $# -gt 0; do
case $1 in
        --format )
            shift
FORMAT="$1"
            shift
            ;;
 
        --prefix )
            shift
PREFIX="$1"
            shift
            ;;
 
        --separate | -s )
            shift
SEPARATE=1
            ;;
 
        --version )
            version
            exit
            ;;
 
        -? | --usage | --help )
            usage
            exit
            ;;
 
        -* )
            echo "Unrecognized option: $1" >&2
            usage
            exit $E_BAD_OPTION
            ;;
 
        * )
            break
            ;;
    esac
done
 
if [ ! -z "$1" ]; then
OUT_FILE="$1"
    shift
fi
 
# Validate parameters; error early, error often.
if [ $SEPARATE -eq 1 -a ! -d $OUT_FILE ]; then
echo "When creating multiple archives, your destination must be a directory."
    echo "If it's not, you risk being surprised when your files are overwritten."
    exit
elif [ `git config -l | grep -q '^core\.bare=false'; echo $?` -ne 0 ]; then
echo "$PROGRAM must be run from a git working copy (i.e., not a bare repository)."
    exit
fi
 
# Create the superproject's git-archive
git archive --format=$FORMAT --prefix="$PREFIX" $TREEISH > $TMPDIR/$(basename $(pwd)).$FORMAT
echo $TMPDIR/$(basename $(pwd)).$FORMAT >| $TMPFILE # clobber on purpose
superfile=`head -n 1 $TMPFILE`
 
# find all '.git' dirs, these show us the remaining to-be-archived dirs
find . -name '.git' -type d -print | sed -e 's/^\.\///' -e 's/\.git$//' | grep -v '^$' >> $TOARCHIVE
 
while read path; do
TREEISH=$(git submodule | grep "^ .*${path%/} " | cut -d ' ' -f 2) # git-submodule does not list trailing slashes in $path
    cd "$path"
    git archive --format=$FORMAT --prefix="${PREFIX}$path" ${TREEISH:-HEAD} > "$TMPDIR"/"$(echo "$path" | sed -e 's/\//./g')"$FORMAT
    if [ $FORMAT == 'zip' ]; then
        # delete the empty directory entry; zipped submodules won't unzip if we don't do this
        zip -d "$(tail -n 1 $TMPFILE)" "${PREFIX}${path%/}" >/dev/null # remove trailing '/'
    fi
echo "$TMPDIR"/"$(echo "$path" | sed -e 's/\//./g')"$FORMAT >> $TMPFILE
    cd "$OLD_PWD"
done < $TOARCHIVE
 
# Concatenate archives into a super-archive.
if [ $SEPARATE -eq 0 ]; then
if [ $FORMAT == 'tar' ]; then
sed -e '1d' $TMPFILE | while read file; do
tar --concatenate -f "$superfile" "$file" && rm -f "$file"
        done
elif [ $FORMAT == 'zip' ]; then
sed -e '1d' $TMPFILE | while read file; do
            # zip incorrectly stores the full path, so cd and then grow
            cd `dirname "$file"`
            zip -g "$superfile" `basename "$file"` && rm -f "$file"
        done
cd "$OLD_PWD"
    fi
 
echo "$superfile" >| $TMPFILE # clobber on purpose
fi
 
while read file; do
mv "$file" "$OUT_FILE"
done < $TMPFILE
 
