Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 1115 insertions, 0 deletions

diff --git a/git-submodule.sh b/git-submodule.sh
new file mode 100755
index 000000000000..c7f58c5756f7
--- /dev/null
+++ b/git-submodule.sh
@@ -0,0 +1,1115 @@
+#!/bin/sh
+#
+# git-submodule.sh: add, init, update or list git submodules
+#
+# Copyright (c) 2007 Lars Hjemli
+
+dashless=$(basename "$0" | sed -e 's/-/ /')
+USAGE="[--quiet] [--cached]
+   or: $dashless [--quiet] add [-b <branch>] [-f|--force] [--name <name>] [--reference <repository>] [--] <repository> [<path>]
+   or: $dashless [--quiet] status [--cached] [--recursive] [--] [<path>...]
+   or: $dashless [--quiet] init [--] [<path>...]
+   or: $dashless [--quiet] deinit [-f|--force] (--all| [--] <path>...)
+   or: $dashless [--quiet] update [--init] [--remote] [-N|--no-fetch] [-f|--force] [--checkout|--merge|--rebase] [--[no-]recommend-shallow] [--reference <repository>] [--recursive] [--] [<path>...]
+   or: $dashless [--quiet] set-branch (--default|--branch <branch>) [--] <path>
+   or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
+   or: $dashless [--quiet] foreach [--recursive] <command>
+   or: $dashless [--quiet] sync [--recursive] [--] [<path>...]
+   or: $dashless [--quiet] absorbgitdirs [--] [<path>...]"
+OPTIONS_SPEC=
+SUBDIRECTORY_OK=Yes
+. git-sh-setup
+. git-parse-remote
+require_work_tree
+wt_prefix=$(git rev-parse --show-prefix)
+cd_to_toplevel
+
+# Tell the rest of git that any URLs we get don't come
+# directly from the user, so it can apply policy as appropriate.
+GIT_PROTOCOL_FROM_USER=0
+export GIT_PROTOCOL_FROM_USER
+
+command=
+branch=
+force=
+reference=
+cached=
+recursive=
+init=
+files=
+remote=
+nofetch=
+update=
+prefix=
+custom_name=
+depth=
+progress=
+dissociate=
+
+die_if_unmatched ()
+{
+	if test "$1" = "#unmatched"
+	then
+		exit ${2:-1}
+	fi
+}
+
+#
+# Print a submodule configuration setting
+#
+# $1 = submodule name
+# $2 = option name
+# $3 = default value
+#
+# Checks in the usual git-config places first (for overrides),
+# otherwise it falls back on .gitmodules.  This allows you to
+# distribute project-wide defaults in .gitmodules, while still
+# customizing individual repositories if necessary.  If the option is
+# not in .gitmodules either, print a default value.
+#
+get_submodule_config () {
+	name="$1"
+	option="$2"
+	default="$3"
+	value=$(git config submodule."$name"."$option")
+	if test -z "$value"
+	then
+		value=$(git submodule--helper config submodule."$name"."$option")
+	fi
+	printf '%s' "${value:-$default}"
+}
+
+isnumber()
+{
+	n=$(($1 + 0)) 2>/dev/null && test "$n" = "$1"
+}
+
+# Given a full hex object ID, is this the zero OID?
+is_zero_oid () {
+	echo "$1" | sane_egrep '^0+$' >/dev/null 2>&1
+}
+
+# Sanitize the local git environment for use within a submodule. We
+# can't simply use clear_local_git_env since we want to preserve some
+# of the settings from GIT_CONFIG_PARAMETERS.
+sanitize_submodule_env()
+{
+	save_config=$GIT_CONFIG_PARAMETERS
+	clear_local_git_env
+	GIT_CONFIG_PARAMETERS=$save_config
+	export GIT_CONFIG_PARAMETERS
+}
+
+#
+# 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".
+	reference_path=
+	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
+			;;
+		--progress)
+			progress=1
+			;;
+		--reference)
+			case "$2" in '') usage ;; esac
+			reference_path=$2
+			shift
+			;;
+		--reference=*)
+			reference_path="${1#--reference=}"
+			;;
+		--dissociate)
+			dissociate=1
+			;;
+		--name)
+			case "$2" in '') usage ;; esac
+			custom_name=$2
+			shift
+			;;
+		--depth)
+			case "$2" in '') usage ;; esac
+			depth="--depth=$2"
+			shift
+			;;
+		--depth=*)
+			depth=$1
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			usage
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+
+	if ! git submodule--helper config --check-writeable >/dev/null 2>&1
+	then
+		 die "$(eval_gettext "please make sure that the .gitmodules file is in the working tree")"
+	fi
+
+	if test -n "$reference_path"
+	then
+		is_absolute_path "$reference_path" ||
+		reference_path="$wt_prefix$reference_path"
+
+		reference="--reference=$reference_path"
+	fi
+
+	repo=$1
+	sm_path=$2
+
+	if test -z "$sm_path"; then
+		sm_path=$(printf '%s\n' "$repo" |
+			sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
+	fi
+
+	if test -z "$repo" || test -z "$sm_path"; then
+		usage
+	fi
+
+	is_absolute_path "$sm_path" || sm_path="$wt_prefix$sm_path"
+
+	# assure repo is absolute or relative to parent
+	case "$repo" in
+	./*|../*)
+		test -z "$wt_prefix" ||
+		die "$(gettext "Relative path can only be used from the toplevel of the working tree")"
+
+		# dereference source url relative to parent's url
+		realrepo=$(git submodule--helper resolve-relative-url "$repo") || exit
+		;;
+	*:*|/*)
+		# absolute url
+		realrepo=$repo
+		;;
+	*)
+		die "$(eval_gettext "repo URL: '\$repo' must be absolute or begin with ./|../")"
+	;;
+	esac
+
+	# normalize path:
+	# multiple //; leading ./; /./; /../; trailing /
+	sm_path=$(printf '%s/\n' "$sm_path" |
+		sed -e '
+			s|//*|/|g
+			s|^\(\./\)*||
+			s|/\(\./\)*|/|g
+			:start
+			s|\([^/]*\)/\.\./||
+			tstart
+			s|/*$||
+		')
+	if test -z "$force"
+	then
+		git ls-files --error-unmatch "$sm_path" > /dev/null 2>&1 &&
+		die "$(eval_gettext "'\$sm_path' already exists in the index")"
+	else
+		git ls-files -s "$sm_path" | sane_grep -v "^160000" > /dev/null 2>&1 &&
+		die "$(eval_gettext "'\$sm_path' already exists in the index and is not a submodule")"
+	fi
+
+	if test -d "$sm_path" &&
+		test -z $(git -C "$sm_path" rev-parse --show-cdup 2>/dev/null)
+	then
+	    git -C "$sm_path" rev-parse --verify -q HEAD >/dev/null ||
+	    die "$(eval_gettext "'\$sm_path' does not have a commit checked out")"
+	fi
+
+	if test -z "$force" &&
+		! git add --dry-run --ignore-missing --no-warn-embedded-repo "$sm_path" > /dev/null 2>&1
+	then
+		eval_gettextln "The following path is ignored by one of your .gitignore files:
+\$sm_path
+Use -f if you really want to add it." >&2
+		exit 1
+	fi
+
+	if test -n "$custom_name"
+	then
+		sm_name="$custom_name"
+	else
+		sm_name="$sm_path"
+	fi
+
+	if ! git submodule--helper check-name "$sm_name"
+	then
+		die "$(eval_gettext "'$sm_name' is not a valid submodule name")"
+	fi
+
+	# perhaps the path exists and is already a git repo, else clone it
+	if test -e "$sm_path"
+	then
+		if test -d "$sm_path"/.git || test -f "$sm_path"/.git
+		then
+			eval_gettextln "Adding existing repo at '\$sm_path' to the index"
+		else
+			die "$(eval_gettext "'\$sm_path' already exists and is not a valid git repo")"
+		fi
+
+	else
+		if test -d ".git/modules/$sm_name"
+		then
+			if test -z "$force"
+			then
+				eval_gettextln >&2 "A git directory for '\$sm_name' is found locally with remote(s):"
+				GIT_DIR=".git/modules/$sm_name" GIT_WORK_TREE=. git remote -v | grep '(fetch)' | sed -e s,^,"  ", -e s,' (fetch)',, >&2
+				die "$(eval_gettextln "\
+If you want to reuse this local git directory instead of cloning again from
+  \$realrepo
+use the '--force' option. If the local git directory is not the correct repo
+or you are unsure what this means choose another name with the '--name' option.")"
+			else
+				eval_gettextln "Reactivating local git directory for submodule '\$sm_name'."
+			fi
+		fi
+		git submodule--helper clone ${GIT_QUIET:+--quiet} ${progress:+"--progress"} --prefix "$wt_prefix" --path "$sm_path" --name "$sm_name" --url "$realrepo" ${reference:+"$reference"} ${dissociate:+"--dissociate"} ${depth:+"$depth"} || exit
+		(
+			sanitize_submodule_env
+			cd "$sm_path" &&
+			# ash fails to wordsplit ${branch:+-b "$branch"...}
+			case "$branch" in
+			'') git checkout -f -q ;;
+			?*) git checkout -f -q -B "$branch" "origin/$branch" ;;
+			esac
+		) || die "$(eval_gettext "Unable to checkout submodule '\$sm_path'")"
+	fi
+	git config submodule."$sm_name".url "$realrepo"
+
+	git add --no-warn-embedded-repo $force "$sm_path" ||
+	die "$(eval_gettext "Failed to add submodule '\$sm_path'")"
+
+	git submodule--helper config submodule."$sm_name".path "$sm_path" &&
+	git submodule--helper config submodule."$sm_name".url "$repo" &&
+	if test -n "$branch"
+	then
+		git submodule--helper config submodule."$sm_name".branch "$branch"
+	fi &&
+	git add --force .gitmodules ||
+	die "$(eval_gettext "Failed to register submodule '\$sm_path'")"
+
+	# NEEDSWORK: In a multi-working-tree world, this needs to be
+	# set in the per-worktree config.
+	if git config --get submodule.active >/dev/null
+	then
+		# If the submodule being adding isn't already covered by the
+		# current configured pathspec, set the submodule's active flag
+		if ! git submodule--helper is-active "$sm_path"
+		then
+			git config submodule."$sm_name".active "true"
+		fi
+	else
+		git config submodule."$sm_name".active "true"
+	fi
+}
+
+#
+# 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
+
+	git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper foreach ${GIT_QUIET:+--quiet} ${recursive:+--recursive} -- "$@"
+}
+
+#
+# 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
+
+	git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper init ${GIT_QUIET:+--quiet} -- "$@"
+}
+
+#
+# Unregister submodules from .git/config and remove their work tree
+#
+cmd_deinit()
+{
+	# parse $args after "submodule ... deinit".
+	deinit_all=
+	while test $# -ne 0
+	do
+		case "$1" in
+		-f|--force)
+			force=$1
+			;;
+		-q|--quiet)
+			GIT_QUIET=1
+			;;
+		--all)
+			deinit_all=t
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			usage
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper deinit ${GIT_QUIET:+--quiet} ${prefix:+--prefix "$prefix"} ${force:+--force} ${deinit_all:+--all} -- "$@"
+}
+
+is_tip_reachable () (
+	sanitize_submodule_env &&
+	cd "$1" &&
+	rev=$(git rev-list -n 1 "$2" --not --all 2>/dev/null) &&
+	test -z "$rev"
+)
+
+fetch_in_submodule () (
+	sanitize_submodule_env &&
+	cd "$1" &&
+	case "$2" in
+	'')
+		git fetch ;;
+	*)
+		shift
+		git fetch $(get_default_remote) "$@" ;;
+	esac
+)
+
+#
+# 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)
+			GIT_QUIET=1
+			;;
+		-v)
+			GIT_QUIET=0
+			;;
+		--progress)
+			progress=1
+			;;
+		-i|--init)
+			init=1
+			;;
+		--remote)
+			remote=1
+			;;
+		-N|--no-fetch)
+			nofetch=1
+			;;
+		-f|--force)
+			force=$1
+			;;
+		-r|--rebase)
+			update="rebase"
+			;;
+		--reference)
+			case "$2" in '') usage ;; esac
+			reference="--reference=$2"
+			shift
+			;;
+		--reference=*)
+			reference="$1"
+			;;
+		--dissociate)
+			dissociate=1
+			;;
+		-m|--merge)
+			update="merge"
+			;;
+		--recursive)
+			recursive=1
+			;;
+		--checkout)
+			update="checkout"
+			;;
+		--recommend-shallow)
+			recommend_shallow="--recommend-shallow"
+			;;
+		--no-recommend-shallow)
+			recommend_shallow="--no-recommend-shallow"
+			;;
+		--depth)
+			case "$2" in '') usage ;; esac
+			depth="--depth=$2"
+			shift
+			;;
+		--depth=*)
+			depth=$1
+			;;
+		-j|--jobs)
+			case "$2" in '') usage ;; esac
+			jobs="--jobs=$2"
+			shift
+			;;
+		--jobs=*)
+			jobs=$1
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			usage
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+
+	if test -n "$init"
+	then
+		cmd_init "--" "$@" || return
+	fi
+
+	{
+	git submodule--helper update-clone ${GIT_QUIET:+--quiet} \
+		${progress:+"--progress"} \
+		${wt_prefix:+--prefix "$wt_prefix"} \
+		${prefix:+--recursive-prefix "$prefix"} \
+		${update:+--update "$update"} \
+		${reference:+"$reference"} \
+		${dissociate:+"--dissociate"} \
+		${depth:+--depth "$depth"} \
+		$recommend_shallow \
+		$jobs \
+		-- \
+		"$@" || echo "#unmatched" $?
+	} | {
+	err=
+	while read -r quickabort sha1 just_cloned sm_path
+	do
+		die_if_unmatched "$quickabort" "$sha1"
+
+		git submodule--helper ensure-core-worktree "$sm_path" || exit 1
+
+		update_module=$(git submodule--helper update-module-mode $just_cloned "$sm_path" $update)
+
+		displaypath=$(git submodule--helper relative-path "$prefix$sm_path" "$wt_prefix")
+
+		if test $just_cloned -eq 1
+		then
+			subsha1=
+		else
+			subsha1=$(sanitize_submodule_env; cd "$sm_path" &&
+				git rev-parse --verify HEAD) ||
+			die "$(eval_gettext "Unable to find current revision in submodule path '\$displaypath'")"
+		fi
+
+		if test -n "$remote"
+		then
+			branch=$(git submodule--helper remote-branch "$sm_path")
+			if test -z "$nofetch"
+			then
+				# Fetch remote before determining tracking $sha1
+				fetch_in_submodule "$sm_path" $depth ||
+				die "$(eval_gettext "Unable to fetch in submodule path '\$sm_path'")"
+			fi
+			remote_name=$(sanitize_submodule_env; cd "$sm_path" && get_default_remote)
+			sha1=$(sanitize_submodule_env; cd "$sm_path" &&
+				git rev-parse --verify "${remote_name}/${branch}") ||
+			die "$(eval_gettext "Unable to find current \${remote_name}/\${branch} revision in submodule path '\$sm_path'")"
+		fi
+
+		if test "$subsha1" != "$sha1" || test -n "$force"
+		then
+			subforce=$force
+			# If we don't already have a -f flag and the submodule has never been checked out
+			if test -z "$subsha1" && test -z "$force"
+			then
+				subforce="-f"
+			fi
+
+			if test -z "$nofetch"
+			then
+				# Run fetch only if $sha1 isn't present or it
+				# is not reachable from a ref.
+				is_tip_reachable "$sm_path" "$sha1" ||
+				fetch_in_submodule "$sm_path" $depth ||
+				say "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'; trying to directly fetch \$sha1:")"
+
+				# Now we tried the usual fetch, but $sha1 may
+				# not be reachable from any of the refs
+				is_tip_reachable "$sm_path" "$sha1" ||
+				fetch_in_submodule "$sm_path" $depth "$sha1" ||
+				die "$(eval_gettext "Fetched in submodule path '\$displaypath', but it did not contain \$sha1. Direct fetching of that commit failed.")"
+			fi
+
+			must_die_on_failure=
+			case "$update_module" in
+			checkout)
+				command="git checkout $subforce -q"
+				die_msg="$(eval_gettext "Unable to checkout '\$sha1' in submodule path '\$displaypath'")"
+				say_msg="$(eval_gettext "Submodule path '\$displaypath': checked out '\$sha1'")"
+				;;
+			rebase)
+				command="git rebase"
+				die_msg="$(eval_gettext "Unable to rebase '\$sha1' in submodule path '\$displaypath'")"
+				say_msg="$(eval_gettext "Submodule path '\$displaypath': rebased into '\$sha1'")"
+				must_die_on_failure=yes
+				;;
+			merge)
+				command="git merge"
+				die_msg="$(eval_gettext "Unable to merge '\$sha1' in submodule path '\$displaypath'")"
+				say_msg="$(eval_gettext "Submodule path '\$displaypath': merged in '\$sha1'")"
+				must_die_on_failure=yes
+				;;
+			!*)
+				command="${update_module#!}"
+				die_msg="$(eval_gettext "Execution of '\$command \$sha1' failed in submodule path '\$displaypath'")"
+				say_msg="$(eval_gettext "Submodule path '\$displaypath': '\$command \$sha1'")"
+				must_die_on_failure=yes
+				;;
+			*)
+				die "$(eval_gettext "Invalid update mode '$update_module' for submodule path '$path'")"
+			esac
+
+			if (sanitize_submodule_env; cd "$sm_path" && $command "$sha1")
+			then
+				say "$say_msg"
+			elif test -n "$must_die_on_failure"
+			then
+				die_with_status 2 "$die_msg"
+			else
+				err="${err};$die_msg"
+				continue
+			fi
+		fi
+
+		if test -n "$recursive"
+		then
+			(
+				prefix=$(git submodule--helper relative-path "$prefix$sm_path/" "$wt_prefix")
+				wt_prefix=
+				sanitize_submodule_env
+				cd "$sm_path" &&
+				eval cmd_update
+			)
+			res=$?
+			if test $res -gt 0
+			then
+				die_msg="$(eval_gettext "Failed to recurse into submodule path '\$displaypath'")"
+				if test $res -ne 2
+				then
+					err="${err};$die_msg"
+					continue
+				else
+					die_with_status $res "$die_msg"
+				fi
+			fi
+		fi
+	done
+
+	if test -n "$err"
+	then
+		OIFS=$IFS
+		IFS=';'
+		for e in $err
+		do
+			if test -n "$e"
+			then
+				echo >&2 "$e"
+			fi
+		done
+		IFS=$OIFS
+		exit 1
+	fi
+	}
+}
+
+#
+# Configures a submodule's default branch
+#
+# $@ = requested path
+#
+cmd_set_branch() {
+	unset_branch=false
+	branch=
+
+	while test $# -ne 0
+	do
+		case "$1" in
+		-q|--quiet)
+			# we don't do anything with this but we need to accept it
+			;;
+		-d|--default)
+			unset_branch=true
+			;;
+		-b|--branch)
+			case "$2" in '') usage ;; esac
+			branch=$2
+			shift
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			usage
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+
+	if test $# -ne 1
+	then
+		usage
+	fi
+
+	# we can't use `git submodule--helper name` here because internally, it
+	# hashes the path so a trailing slash could lead to an unintentional no match
+	name="$(git submodule--helper list "$1" | cut -f2)"
+	if test -z "$name"
+	then
+		exit 1
+	fi
+
+	test -n "$branch"; has_branch=$?
+	test "$unset_branch" = true; has_unset_branch=$?
+
+	if test $((!$has_branch != !$has_unset_branch)) -eq 0
+	then
+		usage
+	fi
+
+	if test $has_branch -eq 0
+	then
+		git submodule--helper config submodule."$name".branch "$branch"
+	else
+		git submodule--helper config --unset submodule."$name".branch
+	fi
+}
+
+#
+# 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)
+			summary_limit="$2"
+			isnumber "$summary_limit" || usage
+			shift
+			;;
+		--summary-limit=*)
+			summary_limit="${1#--summary-limit=}"
+			isnumber "$summary_limit" || usage
+			;;
+		--)
+			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" || test "$1" = "HEAD"
+	then
+		# before the first commit: compare with an empty tree
+		head=$(git hash-object -w -t tree --stdin </dev/null)
+		test -z "$1" || shift
+	else
+		head="HEAD"
+	fi
+
+	if [ -n "$files" ]
+	then
+		test -n "$cached" &&
+		die "$(gettext "The --cached option cannot be used with the --files option")"
+		diff_cmd=diff-files
+		head=
+	fi
+
+	cd_to_toplevel
+	eval "set $(git rev-parse --sq --prefix "$wt_prefix" -- "$@")"
+	# Get modified modules cared by user
+	modules=$(git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- "$@" |
+		sane_egrep '^:([0-7]* )?160000' |
+		while read -r mod_src mod_dst sha1_src sha1_dst status sm_path
+		do
+			# Always show modules deleted or type-changed (blob<->module)
+			if test "$status" = D || test "$status" = T
+			then
+				printf '%s\n' "$sm_path"
+				continue
+			fi
+			# Respect the ignore setting for --for-status.
+			if test -n "$for_status"
+			then
+				name=$(git submodule--helper name "$sm_path")
+				ignore_config=$(get_submodule_config "$name" ignore none)
+				test $status != A && test $ignore_config = all && continue
+			fi
+			# Also show added or modified modules which are checked out
+			GIT_DIR="$sm_path/.git" git rev-parse --git-dir >/dev/null 2>&1 &&
+			printf '%s\n' "$sm_path"
+		done
+	)
+
+	test -z "$modules" && return
+
+	git $diff_cmd $cached --ignore-submodules=dirty --raw $head -- $modules |
+	sane_egrep '^:([0-7]* )?160000' |
+	cut -c2- |
+	while read -r mod_src mod_dst sha1_src sha1_dst status name
+	do
+		if test -z "$cached" &&
+			is_zero_oid $sha1_dst
+		then
+			case "$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
+				eval_gettextln "unexpected mode \$mod_dst" >&2
+				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 $sha1_dst^0 >/dev/null &&
+		missing_dst=t
+
+		display_name=$(git submodule--helper relative-path "$name" "$wt_prefix")
+
+		total_commits=
+		case "$missing_src,$missing_dst" in
+		t,)
+			errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_src")"
+			;;
+		,t)
+			errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commit \$sha1_dst")"
+			;;
+		t,t)
+			errmsg="$(eval_gettext "  Warn: \$display_name doesn't contain commits \$sha1_src and \$sha1_dst")"
+			;;
+		*)
+			errmsg=
+			total_commits=$(
+			if test $mod_src = 160000 && test $mod_dst = 160000
+			then
+				range="$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 $range -- | wc -l
+			)
+			total_commits=" ($(($total_commits + 0)))"
+			;;
+		esac
+
+		sha1_abbr_src=$(GIT_DIR="$name/.git" git rev-parse --short $sha1_src 2>/dev/null ||
+			echo $sha1_src | cut -c1-7)
+		sha1_abbr_dst=$(GIT_DIR="$name/.git" git rev-parse --short $sha1_dst 2>/dev/null ||
+			echo $sha1_dst | cut -c1-7)
+
+		if test $status = T
+		then
+			blob="$(gettext "blob")"
+			submodule="$(gettext "submodule")"
+			if test $mod_dst = 160000
+			then
+				echo "* $display_name $sha1_abbr_src($blob)->$sha1_abbr_dst($submodule)$total_commits:"
+			else
+				echo "* $display_name $sha1_abbr_src($submodule)->$sha1_abbr_dst($blob)$total_commits:"
+			fi
+		else
+			echo "* $display_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 && test $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
+}
+#
+# 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)
+			GIT_QUIET=1
+			;;
+		--cached)
+			cached=1
+			;;
+		--recursive)
+			recursive=1
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			usage
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+
+	git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper status ${GIT_QUIET:+--quiet} ${cached:+--cached} ${recursive:+--recursive} -- "$@"
+}
+#
+# 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
+			;;
+		--recursive)
+			recursive=1
+			shift
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			usage
+			;;
+		*)
+			break
+			;;
+		esac
+	done
+
+	git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper sync ${GIT_QUIET:+--quiet} ${recursive:+--recursive} -- "$@"
+}
+
+cmd_absorbgitdirs()
+{
+	git submodule--helper absorb-git-dirs --prefix "$wt_prefix" "$@"
+}
+
+# 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 | deinit | update | set-branch | status | summary | sync | absorbgitdirs)
+		command=$1
+		;;
+	-q|--quiet)
+		GIT_QUIET=1
+		;;
+	-b|--branch)
+		case "$2" in
+		'')
+			usage
+			;;
+		esac
+		branch="$2"; shift
+		;;
+	--cached)
+		cached="$1"
+		;;
+	--)
+		break
+		;;
+	-*)
+		usage
+		;;
+	*)
+		break
+		;;
+	esac
+	shift
+done
+
+# No command word defaults to "status"
+if test -z "$command"
+then
+    if test $# = 0
+    then
+	command=status
+    else
+	usage
+    fi
+fi
+
+# "-b branch" is accepted only by "add" and "set-branch"
+if test -n "$branch" && (test "$command" != add || test "$command" != set-branch)
+then
+	usage
+fi
+
+# "--cached" is accepted only by "status" and "summary"
+if test -n "$cached" && test "$command" != status && test "$command" != summary
+then
+	usage
+fi
+
+"cmd_$(echo $command | sed -e s/-/_/g)" "$@"