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

 USAGE="[--quiet] [--cached] \
 [add <repo> [-b branch] <path>]|[status|init|update [-i|--init]|summary [-n|--summary-limit <n>] [<commit>]] \
 [--] [<path>...]"
 OPTIONS_SPEC=
 . git-sh-setup
 require_work_tree

 command=
 branch=
 quiet=
 cached=

 #
 # print stuff on stdout unless -q was specified
 #
 say()
 {
 	if test -z "$quiet"
 	then
 		echo "$@"
 	fi
 }

 # Resolve relative url by appending to parent's url
 resolve_relative_url ()
 {
 	branch="$(git symbolic-ref HEAD 2>/dev/null)"
 	remote="$(git config branch.${branch#refs/heads/}.remote)"
 	remote="${remote:-origin}"
 	remoteurl=$(git config "remote.$remote.url") ||
 		die "remote ($remote) does not have a url defined in .git/config"
 	url="$1"
 	while test -n "$url"
 	do
 		case "$url" in
 		../*)
 			url="${url#../}"
 			remoteurl="${remoteurl%/*}"
 			;;
 		./*)
 			url="${url#./}"
 			;;
 		*)
 			break;;
 		esac
 	done
 	echo "$remoteurl/$url"
 }

 #
 # 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

 	# If there already is a directory at the submodule path,
 	# expect it to be empty (since that is the default checkout
 	# action) and try to remove it.
 	# Note: if $path is a symlink to a directory the test will
 	# succeed but the rmdir will fail. We might want to fix this.
 	if test -d "$path"
 	then
 		rmdir "$path" 2>/dev/null ||
 		die "Directory '$path' exist, but is neither empty nor a git repository"
 	fi

 	test -e "$path" &&
 	die "A file already exist at path '$path'"

 	git-clone -n "$url" "$path" ||
 	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
 			;;
 		-q|--quiet)
 			quiet=1
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		shift
 	done

 	repo=$1
 	path=$2

 	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

 	# strip trailing slashes from path
 	path=$(echo "$path" | sed -e 's|/*$||')

 	git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
 	die "'$path' already exists in the index"

 	# 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" || exit
 		(unset GIT_DIR; cd "$path" && git checkout -q ${branch:+-b "$branch" "origin/$branch"}) ||
 		die "Unable to checkout submodule '$path'"
 	fi

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

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

 #
 # 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)
 			quiet=1
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		shift
 	done

 	git ls-files --stage -- "$@" | grep '^160000 ' |
 	while read mode sha1 stage path
 	do
 		# Skip already registered paths
 		name=$(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'"

 		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".
 	while test $# -ne 0
 	do
 		case "$1" in
 		-q|--quiet)
 			shift
 			quiet=1
 			;;
 		-i|--init)
 			shift
 			cmd_init "$@" || return
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 	done

 	git ls-files --stage -- "$@" | grep '^160000 ' |
 	while read mode sha1 stage path
 	do
 		name=$(module_name "$path") || exit
 		url=$(git config submodule."$name".url)
 		if test -z "$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" || exit
 			subsha1=
 		else
 			subsha1=$(unset GIT_DIR; cd "$path" &&
 				git rev-parse --verify HEAD) ||
 			die "Unable to find current revision in submodule path '$path'"
 		fi

 		if test "$subsha1" != "$sha1"
 		then
 			(unset GIT_DIR; cd "$path" && git-fetch &&
 				git-checkout -q "$sha1") ||
 			die "Unable to checkout '$sha1' in submodule path '$path'"

 			say "Submodule path '$path': checked out '$sha1'"
 		fi
 	done
 }

 set_name_rev () {
 	revname=$( (
 		unset GIT_DIR
 		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=

 	# parse $args after "submodule ... summary".
 	while test $# -ne 0
 	do
 		case "$1" in
 		--cached)
 			cached="$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 --verify "$1^0" 2>/dev/null)
 	then
 		head=$rev
 		shift
 	else
 		head=HEAD
 	fi

 	cd_to_toplevel
 	# Get modified modules cared by user
 	modules=$(git diff-index $cached --raw $head -- "$@" |
 		grep -e '^:160000' -e '^:[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-index $cached --raw $head -- $modules |
 	grep -e '^:160000' -e '^:[0-7]* 160000' |
 	cut -c2- |
 	while read mod_src mod_dst sha1_src sha1_dst status name
 	do
 		if test -z "$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 --verify $sha1_src^0 >/dev/null 2>&1 &&
 		missing_src=t

 		test $mod_dst = 160000 &&
 		! GIT_DIR="$name/.git" git-rev-parse --verify $sha1_dst^0 >/dev/null 2>&1 &&
 		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 log --pretty=oneline --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
 		echo "# Modified submodules:"
 		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".
 	while test $# -ne 0
 	do
 		case "$1" in
 		-q|--quiet)
 			quiet=1
 			;;
 		--cached)
 			cached=1
 			;;
 		--)
 			shift
 			break
 			;;
 		-*)
 			usage
 			;;
 		*)
 			break
 			;;
 		esac
 		shift
 	done

 	git ls-files --stage -- "$@" | grep '^160000 ' |
 	while read mode sha1 stage path
 	do
 		name=$(module_name "$path") || exit
 		url=$(git config submodule."$name".url)
 		if test -z "$url" || ! test -d "$path"/.git -o -f "$path"/.git
 		then
 			say "-$sha1 $path"
 			continue;
 		fi
 		set_name_rev "$path" "$sha1"
 		if git diff-files --quiet -- "$path"
 		then
 			say " $sha1 $path$revname"
 		else
 			if test -z "$cached"
 			then
 				sha1=$(unset GIT_DIR; cd "$path" && git rev-parse --verify HEAD)
 				set_name_rev "$path" "$sha1"
 			fi
 			say "+$sha1 $path$revname"
 		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 | init | update | status | summary)
 		command=$1
 		;;
 	-q|--quiet)
 		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

	USAGE="[--quiet] [--cached] \
	[add <repo> [-b branch] <path>]\|[status\|init\|update [-i\|--init]\|summary [-n\|--summary-limit <n>] [<commit>]] \
	[--] [<path>...]"
	OPTIONS_SPEC=
	. git-sh-setup
	require_work_tree

	command=
	branch=
	quiet=
	cached=

	#
	# print stuff on stdout unless -q was specified
	#
	say()
	{
	if test -z "$quiet"
	then
	echo "$@"
	fi
	}

	# Resolve relative url by appending to parent's url
	resolve_relative_url ()
	{
	branch="$(git symbolic-ref HEAD 2>/dev/null)"
	remote="$(git config branch.${branch#refs/heads/}.remote)"
	remote="${remote:-origin}"
	remoteurl=$(git config "remote.$remote.url") \|\|
	die "remote ($remote) does not have a url defined in .git/config"
	url="$1"
	while test -n "$url"
	do
	case "$url" in
	../*)
	url="${url#../}"
	remoteurl="${remoteurl%/*}"
	;;
	./*)
	url="${url#./}"
	;;
	*)
	break;;
	esac
	done
	echo "$remoteurl/$url"
	}

	#
	# 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

	# If there already is a directory at the submodule path,
	# expect it to be empty (since that is the default checkout
	# action) and try to remove it.
	# Note: if $path is a symlink to a directory the test will
	# succeed but the rmdir will fail. We might want to fix this.
	if test -d "$path"
	then
	rmdir "$path" 2>/dev/null \|\|
	die "Directory '$path' exist, but is neither empty nor a git repository"
	fi

	test -e "$path" &&
	die "A file already exist at path '$path'"

	git-clone -n "$url" "$path" \|\|
	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
	;;
	-q\|--quiet)
	quiet=1
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	repo=$1
	path=$2

	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

	# strip trailing slashes from path
	path=$(echo "$path" \| sed -e 's\|/*$\|\|')

	git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
	die "'$path' already exists in the index"

	# 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" \|\| exit
	(unset GIT_DIR; cd "$path" && git checkout -q ${branch:+-b "$branch" "origin/$branch"}) \|\|
	die "Unable to checkout submodule '$path'"
	fi

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

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

	#
	# 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)
	quiet=1
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	git ls-files --stage -- "$@" \| grep '^160000 ' \|
	while read mode sha1 stage path
	do
	# Skip already registered paths
	name=$(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'"

	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".
	while test $# -ne 0
	do
	case "$1" in
	-q\|--quiet)
	shift
	quiet=1
	;;
	-i\|--init)
	shift
	cmd_init "$@" \|\| return
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	done

	git ls-files --stage -- "$@" \| grep '^160000 ' \|
	while read mode sha1 stage path
	do
	name=$(module_name "$path") \|\| exit
	url=$(git config submodule."$name".url)
	if test -z "$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" \|\| exit
	subsha1=
	else
	subsha1=$(unset GIT_DIR; cd "$path" &&
	git rev-parse --verify HEAD) \|\|
	die "Unable to find current revision in submodule path '$path'"
	fi

	if test "$subsha1" != "$sha1"
	then
	(unset GIT_DIR; cd "$path" && git-fetch &&
	git-checkout -q "$sha1") \|\|
	die "Unable to checkout '$sha1' in submodule path '$path'"

	say "Submodule path '$path': checked out '$sha1'"
	fi
	done
	}

	set_name_rev () {
	revname=$( (
	unset GIT_DIR
	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=

	# parse $args after "submodule ... summary".
	while test $# -ne 0
	do
	case "$1" in
	--cached)
	cached="$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 --verify "$1^0" 2>/dev/null)
	then
	head=$rev
	shift
	else
	head=HEAD
	fi

	cd_to_toplevel
	# Get modified modules cared by user
	modules=$(git diff-index $cached --raw $head -- "$@" \|
	grep -e '^:160000' -e '^:[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-index $cached --raw $head -- $modules \|
	grep -e '^:160000' -e '^:[0-7]* 160000' \|
	cut -c2- \|
	while read mod_src mod_dst sha1_src sha1_dst status name
	do
	if test -z "$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 --verify $sha1_src^0 >/dev/null 2>&1 &&
	missing_src=t

	test $mod_dst = 160000 &&
	! GIT_DIR="$name/.git" git-rev-parse --verify $sha1_dst^0 >/dev/null 2>&1 &&
	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 log --pretty=oneline --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
	echo "# Modified submodules:"
	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".
	while test $# -ne 0
	do
	case "$1" in
	-q\|--quiet)
	quiet=1
	;;
	--cached)
	cached=1
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	git ls-files --stage -- "$@" \| grep '^160000 ' \|
	while read mode sha1 stage path
	do
	name=$(module_name "$path") \|\| exit
	url=$(git config submodule."$name".url)
	if test -z "$url" \|\| ! test -d "$path"/.git -o -f "$path"/.git
	then
	say "-$sha1 $path"
	continue;
	fi
	set_name_rev "$path" "$sha1"
	if git diff-files --quiet -- "$path"
	then
	say " $sha1 $path$revname"
	else
	if test -z "$cached"
	then
	sha1=$(unset GIT_DIR; cd "$path" && git rev-parse --verify HEAD)
	set_name_rev "$path" "$sha1"
	fi
	say "+$sha1 $path$revname"
	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 \| init \| update \| status \| summary)
	command=$1
	;;
	-q\|--quiet)
	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_$command" "$@"