git-submodule.sh - jrn/git - Git at Google

 #!/bin/sh
 #
 # git-submodules.sh: add, init, update or list git submodules
 #
 # Copyright (c) 2007 Lars Hjemli

 dashless=$(basename "$0" | sed -e 's/-/ /')
 USAGE="[--quiet] add [-b branch] [-f|--force] [--reference <repository>] [--] <repository> [<path>]
    or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
    or: $dashless [--quiet] init [--] [<path>...]
    or: $dashless [--quiet] update [--init] [-N|--no-fetch] [--rebase] [--reference <repository>] [--merge] [--recursive] [--] [<path>...]
    or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
    or: $dashless [--quiet] foreach [--recursive] <command>
    or: $dashless [--quiet] sync [--] [<path>...]"
 OPTIONS_SPEC=
 . git-sh-setup
 . git-parse-remote
 require_work_tree

 command=
 branch=
 force=
 reference=
 cached=
 recursive=
 init=
 files=
 nofetch=
 update=
 prefix=

 # Resolve relative url by appending to parent's url
 resolve_relative_url ()
 {
 	remote=$(get_default_remote)
 	remoteurl=$(git config "remote.$remote.url") ||
 		die "remote ($remote) does not have a url defined in .git/config"
 	url="$1"
 	remoteurl=${remoteurl%/}
 	sep=/
 	while test -n "$url"
 	do
 		case "$url" in
 		../*)
 			url="${url#../}"
 			case "$remoteurl" in
 			*/*)
 				remoteurl="${remoteurl%/*}"
 				;;
 			*:*)
 				remoteurl="${remoteurl%:*}"
 				sep=:
 				;;
 			*)
 				die "cannot strip one component off url '$remoteurl'"
 				;;
 			esac
 			;;
 		./*)
 			url="${url#./}"
 			;;
 		*)
 			break;;
 		esac
 	done
 	echo "$remoteurl$sep${url%/}"
 }

 #
 # Get submodule info for registered submodules
 # $@ = path to limit submodule list
 #
 module_list()
 {
 	git ls-files --error-unmatch --stage -- "$@" | sane_grep '^160000 '
 }

 #
 # Map submodule path to submodule name
 #
 # $1 = path
 #
 module_name()
 {
 	# Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
 	re=$(printf '%s\n' "$1" | sed -e 's/[].[^$\\*]/\\&/g')
 	name=$( git config -f .gitmodules --get-regexp '^submodule\..*\.path$' |
 		sed -n -e 's|^submodule\.\(.*\)\.path '"$re"'$|\1|p' )
        test -z "$name" &&
        die "No submodule mapping found in .gitmodules for path '$path'"
        echo "$name"
 }

 #
 # Clone a submodule
 #
 # Prior to calling, cmd_update checks that a possibly existing
 # path is not a git repository.
 # Likewise, cmd_add checks that path does not exist at all,
 # since it is the location of a new submodule.
 #
 module_clone()
 {
 	path=$1
 	url=$2
 	reference="$3"

 	if test -n "$reference"
 	then
 		git-clone "$reference" -n "$url" "$path"
 	else
 		git-clone -n "$url" "$path"
 	fi ||
 	die "Clone of '$url' into submodule path '$path' failed"
 }

 #
 # Add a new submodule to the working tree, .gitmodules and the index
 #
 # $@ = repo path
 #
 # optional branch is stored in global branch variable
 #
 cmd_add()
 {
 	# parse $args after "submodule ... add".
 	while test $# -ne 0
 	do
 		case "$1" in
 		-b | --branch)
 			case "$2" in '') usage ;; esac
 			branch=$2
 			shift
 			;;
 		-f | --force)
 			force=$1
 			;;
 		-q|--quiet)
 			GIT_QUIET=1
 			;;
 		--reference)
 			case "$2" in '') usage ;; esac
 			reference="--reference=$2"
 			shift
 			;;
 		--reference=*)
 			reference="$1"
 			shift
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		shift
 	done

 	repo=$1
 	path=$2

 	if test -z "$path"; then
 		path=$(echo "$repo" |
 			sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 	fi

 	if test -z "$repo" -o -z "$path"; then
 		usage
 	fi

 	# assure repo is absolute or relative to parent
 	case "$repo" in
 	./*|../*)
 		# dereference source url relative to parent's url
 		realrepo=$(resolve_relative_url "$repo") || exit
 		;;
 	*:*|/*)
 		# absolute url
 		realrepo=$repo
 		;;
 	*)
 		die "repo URL: '$repo' must be absolute or begin with ./|../"
 	;;
 	esac

 	# normalize path:
 	# multiple //; leading ./; /./; /../; trailing /
 	path=$(printf '%s/\n' "$path" |
 		sed -e '
 			s|//*|/|g
 			s|^\(\./\)*||
 			s|/\./|/|g
 			:start
 			s|\([^/]*\)/\.\./||
 			tstart
 			s|/*$||
 		')
 	git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
 	die "'$path' already exists in the index"

 	if test -z "$force" && ! git add --dry-run --ignore-missing "$path" > /dev/null 2>&1
 	then
 		echo >&2 "The following path is ignored by one of your .gitignore files:" &&
 		echo >&2 $path &&
 		echo >&2 "Use -f if you really want to add it."
 		exit 1
 	fi

 	# perhaps the path exists and is already a git repo, else clone it
 	if test -e "$path"
 	then
 		if test -d "$path"/.git -o -f "$path"/.git
 		then
 			echo "Adding existing repo at '$path' to the index"
 		else
 			die "'$path' already exists and is not a valid git repo"
 		fi

 		case "$repo" in
 		./*|../*)
 			url=$(resolve_relative_url "$repo") || exit
 		    ;;
 		*)
 			url="$repo"
 			;;
 		esac
 		git config submodule."$path".url "$url"
 	else

 		module_clone "$path" "$realrepo" "$reference" || exit
 		(
 			clear_local_git_env
 			cd "$path" &&
 			# ash fails to wordsplit ${branch:+-b "$branch"...}
 			case "$branch" in
 			'') git checkout -f -q ;;
 			?*) git checkout -f -q -B "$branch" "origin/$branch" ;;
 			esac
 		) || die "Unable to checkout submodule '$path'"
 	fi

 	git add $force "$path" ||
 	die "Failed to add submodule '$path'"

 	git config -f .gitmodules submodule."$path".path "$path" &&
 	git config -f .gitmodules submodule."$path".url "$repo" &&
 	git add --force .gitmodules ||
 	die "Failed to register submodule '$path'"
 }

 #
 # Execute an arbitrary command sequence in each checked out
 # submodule
 #
 # $@ = command to execute
 #
 cmd_foreach()
 {
 	# parse $args after "submodule ... foreach".
 	while test $# -ne 0
 	do
 		case "$1" in
 		-q|--quiet)
 			GIT_QUIET=1
 			;;
 		--recursive)
 			recursive=1
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		shift
 	done

 	toplevel=$(pwd)

 	module_list |
 	while read mode sha1 stage path
 	do
 		if test -e "$path"/.git
 		then
 			say "Entering '$prefix$path'"
 			name=$(module_name "$path")
 			(
 				prefix="$prefix$path/"
 				clear_local_git_env
 				cd "$path" &&
 				eval "$@" &&
 				if test -n "$recursive"
 				then
 					cmd_foreach "--recursive" "$@"
 				fi
 			) ||
 			die "Stopping at '$path'; script returned non-zero status."
 		fi
 	done
 }

 #
 # Register submodules in .git/config
 #
 # $@ = requested paths (default to all)
 #
 cmd_init()
 {
 	# parse $args after "submodule ... init".
 	while test $# -ne 0
 	do
 		case "$1" in
 		-q|--quiet)
 			GIT_QUIET=1
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		shift
 	done

 	module_list "$@" |
 	while read mode sha1 stage path
 	do
 		# Skip already registered paths
 		name=$(module_name "$path") || exit
 		url=$(git config submodule."$name".url)
 		test -z "$url" || continue

 		url=$(git config -f .gitmodules submodule."$name".url)
 		test -z "$url" &&
 		die "No url found for submodule path '$path' in .gitmodules"

 		# Possibly a url relative to parent
 		case "$url" in
 		./*|../*)
 			url=$(resolve_relative_url "$url") || exit
 			;;
 		esac

 		git config submodule."$name".url "$url" ||
 		die "Failed to register url for submodule path '$path'"

 		upd="$(git config -f .gitmodules submodule."$name".update)"
 		test -z "$upd" ||
 		git config submodule."$name".update "$upd" ||
 		die "Failed to register update mode for submodule path '$path'"

 		say "Submodule '$name' ($url) registered for path '$path'"
 	done
 }

 #
 # Update each submodule path to correct revision, using clone and checkout as needed
 #
 # $@ = requested paths (default to all)
 #
 cmd_update()
 {
 	# parse $args after "submodule ... update".
 	orig_flags=
 	while test $# -ne 0
 	do
 		case "$1" in
 		-q|--quiet)
 			GIT_QUIET=1
 			;;
 		-i|--init)
 			init=1
 			;;
 		-N|--no-fetch)
 			nofetch=1
 			;;
 		-r|--rebase)
 			update="rebase"
 			;;
 		--reference)
 			case "$2" in '') usage ;; esac
 			reference="--reference=$2"
 			orig_flags="$orig_flags $(git rev-parse --sq-quote "$1")"
 			shift
 			;;
 		--reference=*)
 			reference="$1"
 			;;
 		-m|--merge)
 			update="merge"
 			;;
 		--recursive)
 			recursive=1
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		orig_flags="$orig_flags $(git rev-parse --sq-quote "$1")"
 		shift
 	done

 	if test -n "$init"
 	then
 		cmd_init "--" "$@" || return
 	fi

 	cloned_modules=
 	module_list "$@" |
 	while read mode sha1 stage path
 	do
 		name=$(module_name "$path") || exit
 		url=$(git config submodule."$name".url)
 		update_module=$(git config submodule."$name".update)
 		if test -z "$url"
 		then
 			# Only mention uninitialized submodules when its
 			# path have been specified
 			test "$#" != "0" &&
 			say "Submodule path '$path' not initialized" &&
 			say "Maybe you want to use 'update --init'?"
 			continue
 		fi

 		if ! test -d "$path"/.git -o -f "$path"/.git
 		then
 			module_clone "$path" "$url" "$reference"|| exit
 			cloned_modules="$cloned_modules;$name"
 			subsha1=
 		else
 			subsha1=$(clear_local_git_env; cd "$path" &&
 				git rev-parse --verify HEAD) ||
 			die "Unable to find current revision in submodule path '$path'"
 		fi

 		if ! test -z "$update"
 		then
 			update_module=$update
 		fi

 		if test "$subsha1" != "$sha1"
 		then
 			force=
 			if test -z "$subsha1"
 			then
 				force="-f"
 			fi

 			if test -z "$nofetch"
 			then
 				(clear_local_git_env; cd "$path" &&
 					git-fetch) ||
 				die "Unable to fetch in submodule path '$path'"
 			fi

 			# Is this something we just cloned?
 			case ";$cloned_modules;" in
 			*";$name;"*)
 				# then there is no local change to integrate
 				update_module= ;;
 			esac

 			case "$update_module" in
 			rebase)
 				command="git rebase"
 				action="rebase"
 				msg="rebased onto"
 				;;
 			merge)
 				command="git merge"
 				action="merge"
 				msg="merged in"
 				;;
 			*)
 				command="git checkout $force -q"
 				action="checkout"
 				msg="checked out"
 				;;
 			esac

 			(clear_local_git_env; cd "$path" && $command "$sha1") ||
 			die "Unable to $action '$sha1' in submodule path '$path'"
 			say "Submodule path '$path': $msg '$sha1'"
 		fi

 		if test -n "$recursive"
 		then
 			(clear_local_git_env; cd "$path" && eval cmd_update "$orig_flags") ||
 			die "Failed to recurse into submodule path '$path'"
 		fi
 	done
 }

 set_name_rev () {
 	revname=$( (
 		clear_local_git_env
 		cd "$1" && {
 			git describe "$2" 2>/dev/null ||
 			git describe --tags "$2" 2>/dev/null ||
 			git describe --contains "$2" 2>/dev/null ||
 			git describe --all --always "$2"
 		}
 	) )
 	test -z "$revname" || revname=" ($revname)"
 }
 #
 # Show commit summary for submodules in index or working tree
 #
 # If '--cached' is given, show summary between index and given commit,
 # or between working tree and given commit
 #
 # $@ = [commit (default 'HEAD'),] requested paths (default all)
 #
 cmd_summary() {
 	summary_limit=-1
 	for_status=
 	diff_cmd=diff-index

 	# parse $args after "submodule ... summary".
 	while test $# -ne 0
 	do
 		case "$1" in
 		--cached)
 			cached="$1"
 			;;
 		--files)
 			files="$1"
 			;;
 		--for-status)
 			for_status="$1"
 			;;
 		-n|--summary-limit)
 			if summary_limit=$(($2 + 0)) 2>/dev/null && test "$summary_limit" = "$2"
 			then
 				:
 			else
 				usage
 			fi
 			shift
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		shift
 	done

 	test $summary_limit = 0 && return

 	if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
 	then
 		head=$rev
 		test $# = 0 || shift
 	elif test -z "$1" -o "$1" = "HEAD"
 	then
 		# before the first commit: compare with an empty tree
 		head=$(git hash-object -w -t tree --stdin </dev/null)
 		test -z "$1" || shift
 	else
 		head="HEAD"
 	fi

 	if [ -n "$files" ]
 	then
 		test -n "$cached" &&
 		die "--cached cannot be used with --files"
 		diff_cmd=diff-files
 		head=
 	fi

 	cd_to_toplevel
 	# Get modified modules cared by user
 	modules=$(git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- "$@" |
 		sane_egrep '^:([0-7]* )?160000' |
 		while read mod_src mod_dst sha1_src sha1_dst status name
 		do
 			# Always show modules deleted or type-changed (blob<->module)
 			test $status = D -o $status = T && echo "$name" && continue
 			# Also show added or modified modules which are checked out
 			GIT_DIR="$name/.git" git-rev-parse --git-dir >/dev/null 2>&1 &&
 			echo "$name"
 		done
 	)

 	test -z "$modules" && return

 	git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- $modules |
 	sane_egrep '^:([0-7]* )?160000' |
 	cut -c2- |
 	while read mod_src mod_dst sha1_src sha1_dst status name
 	do
 		if test -z "$cached" &&
 			test $sha1_dst = 0000000000000000000000000000000000000000
 		then
 			case "$mod_dst" in
 			160000)
 				sha1_dst=$(GIT_DIR="$name/.git" git rev-parse HEAD)
 				;;
 			100644 | 100755 | 120000)
 				sha1_dst=$(git hash-object $name)
 				;;
 			000000)
 				;; # removed
 			*)
 				# unexpected type
 				echo >&2 "unexpected mode $mod_dst"
 				continue ;;
 			esac
 		fi
 		missing_src=
 		missing_dst=

 		test $mod_src = 160000 &&
 		! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_src^0 >/dev/null &&
 		missing_src=t

 		test $mod_dst = 160000 &&
 		! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_dst^0 >/dev/null &&
 		missing_dst=t

 		total_commits=
 		case "$missing_src,$missing_dst" in
 		t,)
 			errmsg="  Warn: $name doesn't contain commit $sha1_src"
 			;;
 		,t)
 			errmsg="  Warn: $name doesn't contain commit $sha1_dst"
 			;;
 		t,t)
 			errmsg="  Warn: $name doesn't contain commits $sha1_src and $sha1_dst"
 			;;
 		*)
 			errmsg=
 			total_commits=$(
 			if test $mod_src = 160000 -a $mod_dst = 160000
 			then
 				range="$sha1_src...$sha1_dst"
 			elif test $mod_src = 160000
 			then
 				range=$sha1_src
 			else
 				range=$sha1_dst
 			fi
 			GIT_DIR="$name/.git" \
 			git rev-list --first-parent $range -- | wc -l
 			)
 			total_commits=" ($(($total_commits + 0)))"
 			;;
 		esac

 		sha1_abbr_src=$(echo $sha1_src | cut -c1-7)
 		sha1_abbr_dst=$(echo $sha1_dst | cut -c1-7)
 		if test $status = T
 		then
 			if test $mod_dst = 160000
 			then
 				echo "* $name $sha1_abbr_src(blob)->$sha1_abbr_dst(submodule)$total_commits:"
 			else
 				echo "* $name $sha1_abbr_src(submodule)->$sha1_abbr_dst(blob)$total_commits:"
 			fi
 		else
 			echo "* $name $sha1_abbr_src...$sha1_abbr_dst$total_commits:"
 		fi
 		if test -n "$errmsg"
 		then
 			# Don't give error msg for modification whose dst is not submodule
 			# i.e. deleted or changed to blob
 			test $mod_dst = 160000 && echo "$errmsg"
 		else
 			if test $mod_src = 160000 -a $mod_dst = 160000
 			then
 				limit=
 				test $summary_limit -gt 0 && limit="-$summary_limit"
 				GIT_DIR="$name/.git" \
 				git log $limit --pretty='format:  %m %s' \
 				--first-parent $sha1_src...$sha1_dst
 			elif test $mod_dst = 160000
 			then
 				GIT_DIR="$name/.git" \
 				git log --pretty='format:  > %s' -1 $sha1_dst
 			else
 				GIT_DIR="$name/.git" \
 				git log --pretty='format:  < %s' -1 $sha1_src
 			fi
 			echo
 		fi
 		echo
 	done |
 	if test -n "$for_status"; then
 		if [ -n "$files" ]; then
 			echo "# Submodules changed but not updated:"
 		else
 			echo "# Submodule changes to be committed:"
 		fi
 		echo "#"
 		sed -e 's|^|# |' -e 's|^# $|#|'
 	else
 		cat
 	fi
 }
 #
 # List all submodules, prefixed with:
 #  - submodule not initialized
 #  + different revision checked out
 #
 # If --cached was specified the revision in the index will be printed
 # instead of the currently checked out revision.
 #
 # $@ = requested paths (default to all)
 #
 cmd_status()
 {
 	# parse $args after "submodule ... status".
 	orig_flags=
 	while test $# -ne 0
 	do
 		case "$1" in
 		-q|--quiet)
 			GIT_QUIET=1
 			;;
 		--cached)
 			cached=1
 			;;
 		--recursive)
 			recursive=1
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		orig_flags="$orig_flags $(git rev-parse --sq-quote "$1")"
 		shift
 	done

 	module_list "$@" |
 	while read mode sha1 stage path
 	do
 		name=$(module_name "$path") || exit
 		url=$(git config submodule."$name".url)
 		displaypath="$prefix$path"
 		if test -z "$url" || ! test -d "$path"/.git -o -f "$path"/.git
 		then
 			say "-$sha1 $displaypath"
 			continue;
 		fi
 		set_name_rev "$path" "$sha1"
 		if git diff-files --ignore-submodules=dirty --quiet -- "$path"
 		then
 			say " $sha1 $displaypath$revname"
 		else
 			if test -z "$cached"
 			then
 				sha1=$(clear_local_git_env; cd "$path" && git rev-parse --verify HEAD)
 				set_name_rev "$path" "$sha1"
 			fi
 			say "+$sha1 $displaypath$revname"
 		fi

 		if test -n "$recursive"
 		then
 			(
 				prefix="$displaypath/"
 				clear_local_git_env
 				cd "$path" &&
 				eval cmd_status "$orig_args"
 			) ||
 			die "Failed to recurse into submodule path '$path'"
 		fi
 	done
 }
 #
 # Sync remote urls for submodules
 # This makes the value for remote.$remote.url match the value
 # specified in .gitmodules.
 #
 cmd_sync()
 {
 	while test $# -ne 0
 	do
 		case "$1" in
 		-q|--quiet)
 			GIT_QUIET=1
 			shift
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 	done
 	cd_to_toplevel
 	module_list "$@" |
 	while read mode sha1 stage path
 	do
 		name=$(module_name "$path")
 		url=$(git config -f .gitmodules --get submodule."$name".url)

 		# Possibly a url relative to parent
 		case "$url" in
 		./*|../*)
 			url=$(resolve_relative_url "$url") || exit
 			;;
 		esac

 		say "Synchronizing submodule url for '$name'"
 		git config submodule."$name".url "$url"

 		if test -e "$path"/.git
 		then
 		(
 			clear_local_git_env
 			cd "$path"
 			remote=$(get_default_remote)
 			git config remote."$remote".url "$url"
 		)
 		fi
 	done
 }

 # This loop parses the command line arguments to find the
 # subcommand name to dispatch.  Parsing of the subcommand specific
 # options are primarily done by the subcommand implementations.
 # Subcommand specific options such as --branch and --cached are
 # parsed here as well, for backward compatibility.

 while test $# != 0 && test -z "$command"
 do
 	case "$1" in
 	add | foreach | init | update | status | summary | sync)
 		command=$1
 		;;
 	-q|--quiet)
 		GIT_QUIET=1
 		;;
 	-b|--branch)
 		case "$2" in
 		'')
 			usage
 			;;
 		esac
 		branch="$2"; shift
 		;;
 	--cached)
 		cached="$1"
 		;;
 	--)
 		break
 		;;
 	-*)
 		usage
 		;;
 	*)
 		break
 		;;
 	esac
 	shift
 done

 # No command word defaults to "status"
 test -n "$command" || command=status

 # "-b branch" is accepted only by "add"
 if test -n "$branch" && test "$command" != add
 then
 	usage
 fi

 # "--cached" is accepted only by "status" and "summary"
 if test -n "$cached" && test "$command" != status -a "$command" != summary
 then
 	usage
 fi

 "cmd_$command" "$@"
	#!/bin/sh
	#
	# git-submodules.sh: add, init, update or list git submodules
	#
	# Copyright (c) 2007 Lars Hjemli

	dashless=$(basename "$0" \| sed -e 's/-/ /')
	USAGE="[--quiet] add [-b branch] [-f\|--force] [--reference <repository>] [--] <repository> [<path>]
	or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
	or: $dashless [--quiet] init [--] [<path>...]
	or: $dashless [--quiet] update [--init] [-N\|--no-fetch] [--rebase] [--reference <repository>] [--merge] [--recursive] [--] [<path>...]
	or: $dashless [--quiet] summary [--cached\|--files] [--summary-limit <n>] [commit] [--] [<path>...]
	or: $dashless [--quiet] foreach [--recursive] <command>
	or: $dashless [--quiet] sync [--] [<path>...]"
	OPTIONS_SPEC=
	. git-sh-setup
	. git-parse-remote
	require_work_tree

	command=
	branch=
	force=
	reference=
	cached=
	recursive=
	init=
	files=
	nofetch=
	update=
	prefix=

	# Resolve relative url by appending to parent's url
	resolve_relative_url ()
	{
	remote=$(get_default_remote)
	remoteurl=$(git config "remote.$remote.url") \|\|
	die "remote ($remote) does not have a url defined in .git/config"
	url="$1"
	remoteurl=${remoteurl%/}
	sep=/
	while test -n "$url"
	do
	case "$url" in
	../*)
	url="${url#../}"
	case "$remoteurl" in
	/)
	remoteurl="${remoteurl%/*}"
	;;
	:)
	remoteurl="${remoteurl%:*}"
	sep=:
	;;
	*)
	die "cannot strip one component off url '$remoteurl'"
	;;
	esac
	;;
	./*)
	url="${url#./}"
	;;
	*)
	break;;
	esac
	done
	echo "$remoteurl$sep${url%/}"
	}

	#
	# Get submodule info for registered submodules
	# $@ = path to limit submodule list
	#
	module_list()
	{
	git ls-files --error-unmatch --stage -- "$@" \| sane_grep '^160000 '
	}

	#
	# Map submodule path to submodule name
	#
	# $1 = path
	#
	module_name()
	{
	# Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
	re=$(printf '%s\n' "$1" \| sed -e 's/[].[^$\\*]/\\&/g')
	name=$( git config -f .gitmodules --get-regexp '^submodule\..*\.path$' \|
	sed -n -e 's\|^submodule\.\(.*\)\.path '"$re"'$\|\1\|p' )
	test -z "$name" &&
	die "No submodule mapping found in .gitmodules for path '$path'"
	echo "$name"
	}

	#
	# Clone a submodule
	#
	# Prior to calling, cmd_update checks that a possibly existing
	# path is not a git repository.
	# Likewise, cmd_add checks that path does not exist at all,
	# since it is the location of a new submodule.
	#
	module_clone()
	{
	path=$1
	url=$2
	reference="$3"

	if test -n "$reference"
	then
	git-clone "$reference" -n "$url" "$path"
	else
	git-clone -n "$url" "$path"
	fi \|\|
	die "Clone of '$url' into submodule path '$path' failed"
	}

	#
	# Add a new submodule to the working tree, .gitmodules and the index
	#
	# $@ = repo path
	#
	# optional branch is stored in global branch variable
	#
	cmd_add()
	{
	# parse $args after "submodule ... add".
	while test $# -ne 0
	do
	case "$1" in
	-b \| --branch)
	case "$2" in '') usage ;; esac
	branch=$2
	shift
	;;
	-f \| --force)
	force=$1
	;;
	-q\|--quiet)
	GIT_QUIET=1
	;;
	--reference)
	case "$2" in '') usage ;; esac
	reference="--reference=$2"
	shift
	;;
	--reference=*)
	reference="$1"
	shift
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	repo=$1
	path=$2

	if test -z "$path"; then
	path=$(echo "$repo" \|
	sed -e 's\|/$\|\|' -e 's\|:/\.git$\|\|' -e 's\|.*[/:]\|\|g')
	fi

	if test -z "$repo" -o -z "$path"; then
	usage
	fi

	# assure repo is absolute or relative to parent
	case "$repo" in
	./\|../)
	# dereference source url relative to parent's url
	realrepo=$(resolve_relative_url "$repo") \|\| exit
	;;
	:\|/*)
	# absolute url
	realrepo=$repo
	;;
	*)
	die "repo URL: '$repo' must be absolute or begin with ./\|../"
	;;
	esac

	# normalize path:
	# multiple //; leading ./; /./; /../; trailing /
	path=$(printf '%s/\n' "$path" \|
	sed -e '
	s\|//*\|/\|g
	s\|^\(\./\)*\|\|
	s\|/\./\|/\|g
	:start
	s\|\([^/]*\)/\.\./\|\|
	tstart
	s\|/*$\|\|
	')
	git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
	die "'$path' already exists in the index"

	if test -z "$force" && ! git add --dry-run --ignore-missing "$path" > /dev/null 2>&1
	then
	echo >&2 "The following path is ignored by one of your .gitignore files:" &&
	echo >&2 $path &&
	echo >&2 "Use -f if you really want to add it."
	exit 1
	fi

	# perhaps the path exists and is already a git repo, else clone it
	if test -e "$path"
	then
	if test -d "$path"/.git -o -f "$path"/.git
	then
	echo "Adding existing repo at '$path' to the index"
	else
	die "'$path' already exists and is not a valid git repo"
	fi

	case "$repo" in
	./\|../)
	url=$(resolve_relative_url "$repo") \|\| exit
	;;
	*)
	url="$repo"
	;;
	esac
	git config submodule."$path".url "$url"
	else

	module_clone "$path" "$realrepo" "$reference" \|\| exit
	(
	clear_local_git_env
	cd "$path" &&
	# ash fails to wordsplit ${branch:+-b "$branch"...}
	case "$branch" in
	'') git checkout -f -q ;;
	?*) git checkout -f -q -B "$branch" "origin/$branch" ;;
	esac
	) \|\| die "Unable to checkout submodule '$path'"
	fi

	git add $force "$path" \|\|
	die "Failed to add submodule '$path'"

	git config -f .gitmodules submodule."$path".path "$path" &&
	git config -f .gitmodules submodule."$path".url "$repo" &&
	git add --force .gitmodules \|\|
	die "Failed to register submodule '$path'"
	}

	#
	# Execute an arbitrary command sequence in each checked out
	# submodule
	#
	# $@ = command to execute
	#
	cmd_foreach()
	{
	# parse $args after "submodule ... foreach".
	while test $# -ne 0
	do
	case "$1" in
	-q\|--quiet)
	GIT_QUIET=1
	;;
	--recursive)
	recursive=1
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	toplevel=$(pwd)

	module_list \|
	while read mode sha1 stage path
	do
	if test -e "$path"/.git
	then
	say "Entering '$prefix$path'"
	name=$(module_name "$path")
	(
	prefix="$prefix$path/"
	clear_local_git_env
	cd "$path" &&
	eval "$@" &&
	if test -n "$recursive"
	then
	cmd_foreach "--recursive" "$@"
	fi
	) \|\|
	die "Stopping at '$path'; script returned non-zero status."
	fi
	done
	}

	#
	# Register submodules in .git/config
	#
	# $@ = requested paths (default to all)
	#
	cmd_init()
	{
	# parse $args after "submodule ... init".
	while test $# -ne 0
	do
	case "$1" in
	-q\|--quiet)
	GIT_QUIET=1
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	module_list "$@" \|
	while read mode sha1 stage path
	do
	# Skip already registered paths
	name=$(module_name "$path") \|\| exit
	url=$(git config submodule."$name".url)
	test -z "$url" \|\| continue

	url=$(git config -f .gitmodules submodule."$name".url)
	test -z "$url" &&
	die "No url found for submodule path '$path' in .gitmodules"

	# Possibly a url relative to parent
	case "$url" in
	./\|../)
	url=$(resolve_relative_url "$url") \|\| exit
	;;
	esac

	git config submodule."$name".url "$url" \|\|
	die "Failed to register url for submodule path '$path'"

	upd="$(git config -f .gitmodules submodule."$name".update)"
	test -z "$upd" \|\|
	git config submodule."$name".update "$upd" \|\|
	die "Failed to register update mode for submodule path '$path'"

	say "Submodule '$name' ($url) registered for path '$path'"
	done
	}

	#
	# Update each submodule path to correct revision, using clone and checkout as needed
	#
	# $@ = requested paths (default to all)
	#
	cmd_update()
	{
	# parse $args after "submodule ... update".
	orig_flags=
	while test $# -ne 0
	do
	case "$1" in
	-q\|--quiet)
	GIT_QUIET=1
	;;
	-i\|--init)
	init=1
	;;
	-N\|--no-fetch)
	nofetch=1
	;;
	-r\|--rebase)
	update="rebase"
	;;
	--reference)
	case "$2" in '') usage ;; esac
	reference="--reference=$2"
	orig_flags="$orig_flags $(git rev-parse --sq-quote "$1")"
	shift
	;;
	--reference=*)
	reference="$1"
	;;
	-m\|--merge)
	update="merge"
	;;
	--recursive)
	recursive=1
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	orig_flags="$orig_flags $(git rev-parse --sq-quote "$1")"
	shift
	done

	if test -n "$init"
	then
	cmd_init "--" "$@" \|\| return
	fi

	cloned_modules=
	module_list "$@" \|
	while read mode sha1 stage path
	do
	name=$(module_name "$path") \|\| exit
	url=$(git config submodule."$name".url)
	update_module=$(git config submodule."$name".update)
	if test -z "$url"
	then
	# Only mention uninitialized submodules when its
	# path have been specified
	test "$#" != "0" &&
	say "Submodule path '$path' not initialized" &&
	say "Maybe you want to use 'update --init'?"
	continue
	fi

	if ! test -d "$path"/.git -o -f "$path"/.git
	then
	module_clone "$path" "$url" "$reference"\|\| exit
	cloned_modules="$cloned_modules;$name"
	subsha1=
	else
	subsha1=$(clear_local_git_env; cd "$path" &&
	git rev-parse --verify HEAD) \|\|
	die "Unable to find current revision in submodule path '$path'"
	fi

	if ! test -z "$update"
	then
	update_module=$update
	fi

	if test "$subsha1" != "$sha1"
	then
	force=
	if test -z "$subsha1"
	then
	force="-f"
	fi

	if test -z "$nofetch"
	then
	(clear_local_git_env; cd "$path" &&
	git-fetch) \|\|
	die "Unable to fetch in submodule path '$path'"
	fi

	# Is this something we just cloned?
	case ";$cloned_modules;" in
	";$name;")
	# then there is no local change to integrate
	update_module= ;;
	esac

	case "$update_module" in
	rebase)
	command="git rebase"
	action="rebase"
	msg="rebased onto"
	;;
	merge)
	command="git merge"
	action="merge"
	msg="merged in"
	;;
	*)
	command="git checkout $force -q"
	action="checkout"
	msg="checked out"
	;;
	esac

	(clear_local_git_env; cd "$path" && $command "$sha1") \|\|
	die "Unable to $action '$sha1' in submodule path '$path'"
	say "Submodule path '$path': $msg '$sha1'"
	fi

	if test -n "$recursive"
	then
	(clear_local_git_env; cd "$path" && eval cmd_update "$orig_flags") \|\|
	die "Failed to recurse into submodule path '$path'"
	fi
	done
	}

	set_name_rev () {
	revname=$( (
	clear_local_git_env
	cd "$1" && {
	git describe "$2" 2>/dev/null \|\|
	git describe --tags "$2" 2>/dev/null \|\|
	git describe --contains "$2" 2>/dev/null \|\|
	git describe --all --always "$2"
	}
	) )
	test -z "$revname" \|\| revname=" ($revname)"
	}
	#
	# Show commit summary for submodules in index or working tree
	#
	# If '--cached' is given, show summary between index and given commit,
	# or between working tree and given commit
	#
	# $@ = [commit (default 'HEAD'),] requested paths (default all)
	#
	cmd_summary() {
	summary_limit=-1
	for_status=
	diff_cmd=diff-index

	# parse $args after "submodule ... summary".
	while test $# -ne 0
	do
	case "$1" in
	--cached)
	cached="$1"
	;;
	--files)
	files="$1"
	;;
	--for-status)
	for_status="$1"
	;;
	-n\|--summary-limit)
	if summary_limit=$(($2 + 0)) 2>/dev/null && test "$summary_limit" = "$2"
	then
	:
	else
	usage
	fi
	shift
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	test $summary_limit = 0 && return

	if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
	then
	head=$rev
	test $# = 0 \|\| shift
	elif test -z "$1" -o "$1" = "HEAD"
	then
	# before the first commit: compare with an empty tree
	head=$(git hash-object -w -t tree --stdin </dev/null)
	test -z "$1" \|\| shift
	else
	head="HEAD"
	fi

	if [ -n "$files" ]
	then
	test -n "$cached" &&
	die "--cached cannot be used with --files"
	diff_cmd=diff-files
	head=
	fi

	cd_to_toplevel
	# Get modified modules cared by user
	modules=$(git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- "$@" \|
	sane_egrep '^:([0-7]* )?160000' \|
	while read mod_src mod_dst sha1_src sha1_dst status name
	do
	# Always show modules deleted or type-changed (blob<->module)
	test $status = D -o $status = T && echo "$name" && continue
	# Also show added or modified modules which are checked out
	GIT_DIR="$name/.git" git-rev-parse --git-dir >/dev/null 2>&1 &&
	echo "$name"
	done
	)

	test -z "$modules" && return

	git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- $modules \|
	sane_egrep '^:([0-7]* )?160000' \|
	cut -c2- \|
	while read mod_src mod_dst sha1_src sha1_dst status name
	do
	if test -z "$cached" &&
	test $sha1_dst = 0000000000000000000000000000000000000000
	then
	case "$mod_dst" in
	160000)
	sha1_dst=$(GIT_DIR="$name/.git" git rev-parse HEAD)
	;;
	100644 \| 100755 \| 120000)
	sha1_dst=$(git hash-object $name)
	;;
	000000)
	;; # removed
	*)
	# unexpected type
	echo >&2 "unexpected mode $mod_dst"
	continue ;;
	esac
	fi
	missing_src=
	missing_dst=

	test $mod_src = 160000 &&
	! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_src^0 >/dev/null &&
	missing_src=t

	test $mod_dst = 160000 &&
	! GIT_DIR="$name/.git" git-rev-parse -q --verify $sha1_dst^0 >/dev/null &&
	missing_dst=t

	total_commits=
	case "$missing_src,$missing_dst" in
	t,)
	errmsg=" Warn: $name doesn't contain commit $sha1_src"
	;;
	,t)
	errmsg=" Warn: $name doesn't contain commit $sha1_dst"
	;;
	t,t)
	errmsg=" Warn: $name doesn't contain commits $sha1_src and $sha1_dst"
	;;
	*)
	errmsg=
	total_commits=$(
	if test $mod_src = 160000 -a $mod_dst = 160000
	then
	range="$sha1_src...$sha1_dst"
	elif test $mod_src = 160000
	then
	range=$sha1_src
	else
	range=$sha1_dst
	fi
	GIT_DIR="$name/.git" \
	git rev-list --first-parent $range -- \| wc -l
	)
	total_commits=" ($(($total_commits + 0)))"
	;;
	esac

	sha1_abbr_src=$(echo $sha1_src \| cut -c1-7)
	sha1_abbr_dst=$(echo $sha1_dst \| cut -c1-7)
	if test $status = T
	then
	if test $mod_dst = 160000
	then
	echo "* $name $sha1_abbr_src(blob)->$sha1_abbr_dst(submodule)$total_commits:"
	else
	echo "* $name $sha1_abbr_src(submodule)->$sha1_abbr_dst(blob)$total_commits:"
	fi
	else
	echo "* $name $sha1_abbr_src...$sha1_abbr_dst$total_commits:"
	fi
	if test -n "$errmsg"
	then
	# Don't give error msg for modification whose dst is not submodule
	# i.e. deleted or changed to blob
	test $mod_dst = 160000 && echo "$errmsg"
	else
	if test $mod_src = 160000 -a $mod_dst = 160000
	then
	limit=
	test $summary_limit -gt 0 && limit="-$summary_limit"
	GIT_DIR="$name/.git" \
	git log $limit --pretty='format: %m %s' \
	--first-parent $sha1_src...$sha1_dst
	elif test $mod_dst = 160000
	then
	GIT_DIR="$name/.git" \
	git log --pretty='format: > %s' -1 $sha1_dst
	else
	GIT_DIR="$name/.git" \
	git log --pretty='format: < %s' -1 $sha1_src
	fi
	echo
	fi
	echo
	done \|
	if test -n "$for_status"; then
	if [ -n "$files" ]; then
	echo "# Submodules changed but not updated:"
	else
	echo "# Submodule changes to be committed:"
	fi
	echo "#"
	sed -e 's\|^\|# \|' -e 's\|^# $\|#\|'
	else
	cat
	fi
	}
	#
	# List all submodules, prefixed with:
	# - submodule not initialized
	# + different revision checked out
	#
	# If --cached was specified the revision in the index will be printed
	# instead of the currently checked out revision.
	#
	# $@ = requested paths (default to all)
	#
	cmd_status()
	{
	# parse $args after "submodule ... status".
	orig_flags=
	while test $# -ne 0
	do
	case "$1" in
	-q\|--quiet)
	GIT_QUIET=1
	;;
	--cached)
	cached=1
	;;
	--recursive)
	recursive=1
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	orig_flags="$orig_flags $(git rev-parse --sq-quote "$1")"
	shift
	done

	module_list "$@" \|
	while read mode sha1 stage path
	do
	name=$(module_name "$path") \|\| exit
	url=$(git config submodule."$name".url)
	displaypath="$prefix$path"
	if test -z "$url" \|\| ! test -d "$path"/.git -o -f "$path"/.git
	then
	say "-$sha1 $displaypath"
	continue;
	fi
	set_name_rev "$path" "$sha1"
	if git diff-files --ignore-submodules=dirty --quiet -- "$path"
	then
	say " $sha1 $displaypath$revname"
	else
	if test -z "$cached"
	then
	sha1=$(clear_local_git_env; cd "$path" && git rev-parse --verify HEAD)
	set_name_rev "$path" "$sha1"
	fi
	say "+$sha1 $displaypath$revname"
	fi

	if test -n "$recursive"
	then
	(
	prefix="$displaypath/"
	clear_local_git_env
	cd "$path" &&
	eval cmd_status "$orig_args"
	) \|\|
	die "Failed to recurse into submodule path '$path'"
	fi
	done
	}
	#
	# Sync remote urls for submodules
	# This makes the value for remote.$remote.url match the value
	# specified in .gitmodules.
	#
	cmd_sync()
	{
	while test $# -ne 0
	do
	case "$1" in
	-q\|--quiet)
	GIT_QUIET=1
	shift
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	done
	cd_to_toplevel
	module_list "$@" \|
	while read mode sha1 stage path
	do
	name=$(module_name "$path")
	url=$(git config -f .gitmodules --get submodule."$name".url)

	# Possibly a url relative to parent
	case "$url" in
	./\|../)
	url=$(resolve_relative_url "$url") \|\| exit
	;;
	esac

	say "Synchronizing submodule url for '$name'"
	git config submodule."$name".url "$url"

	if test -e "$path"/.git
	then
	(
	clear_local_git_env
	cd "$path"
	remote=$(get_default_remote)
	git config remote."$remote".url "$url"
	)
	fi
	done
	}

	# This loop parses the command line arguments to find the
	# subcommand name to dispatch. Parsing of the subcommand specific
	# options are primarily done by the subcommand implementations.
	# Subcommand specific options such as --branch and --cached are
	# parsed here as well, for backward compatibility.

	while test $# != 0 && test -z "$command"
	do
	case "$1" in
	add \| foreach \| init \| update \| status \| summary \| sync)
	command=$1
	;;
	-q\|--quiet)
	GIT_QUIET=1
	;;
	-b\|--branch)
	case "$2" in
	'')
	usage
	;;
	esac
	branch="$2"; shift
	;;
	--cached)
	cached="$1"
	;;
	--)
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	# No command word defaults to "status"
	test -n "$command" \|\| command=status

	# "-b branch" is accepted only by "add"
	if test -n "$branch" && test "$command" != add
	then
	usage
	fi

	# "--cached" is accepted only by "status" and "summary"
	if test -n "$cached" && test "$command" != status -a "$command" != summary
	then
	usage
	fi

	"cmd_$command" "$@"