git-clone.sh - git - Git at Google

 #!/bin/sh
 #
 # Copyright (c) 2005, Linus Torvalds
 # Copyright (c) 2005, Junio C Hamano
 #
 # Clone a repository into a different directory that does not yet exist.

 # See git-sh-setup why.
 unset CDPATH

 die() {
 	echo >&2 "$@"
 	exit 1
 }

 usage() {
 	die "Usage: $0 [--template=<template_directory>] [--reference <reference-repo>] [--bare] [-l [-s]] [-q] [-u <upload-pack>] [--origin <name>] [--depth <n>] [-n] <repo> [<dir>]"
 }

 get_repo_base() {
 	(cd "$1" && (cd .git ; pwd)) 2> /dev/null
 }

 if [ -n "$GIT_SSL_NO_VERIFY" ]; then
     curl_extra_args="-k"
 fi

 http_fetch () {
 	# $1 = Remote, $2 = Local
 	curl -nsfL $curl_extra_args "$1" >"$2"
 }

 clone_dumb_http () {
 	# $1 - remote, $2 - local
 	cd "$2" &&
 	clone_tmp="$GIT_DIR/clone-tmp" &&
 	mkdir -p "$clone_tmp" || exit 1
 	if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
 		"`git-config --bool http.noEPSV`" = true ]; then
 		curl_extra_args="${curl_extra_args} --disable-epsv"
 	fi
 	http_fetch "$1/info/refs" "$clone_tmp/refs" ||
 		die "Cannot get remote repository information.
 Perhaps git-update-server-info needs to be run there?"
 	while read sha1 refname
 	do
 		name=`expr "z$refname" : 'zrefs/\(.*\)'` &&
 		case "$name" in
 		*^*)	continue;;
 		esac
 		case "$bare,$name" in
 		yes,* | ,heads/* | ,tags/*) ;;
 		*)	continue ;;
 		esac
 		if test -n "$use_separate_remote" &&
 		   branch_name=`expr "z$name" : 'zheads/\(.*\)'`
 		then
 			tname="remotes/$origin/$branch_name"
 		else
 			tname=$name
 		fi
 		git-http-fetch -v -a -w "$tname" "$name" "$1/" || exit 1
 	done <"$clone_tmp/refs"
 	rm -fr "$clone_tmp"
 	http_fetch "$1/HEAD" "$GIT_DIR/REMOTE_HEAD" ||
 	rm -f "$GIT_DIR/REMOTE_HEAD"
 }

 quiet=
 local=no
 use_local=no
 local_shared=no
 unset template
 no_checkout=
 upload_pack=
 bare=
 reference=
 origin=
 origin_override=
 use_separate_remote=t
 depth=
 while
 	case "$#,$1" in
 	0,*) break ;;
 	*,-n|*,--no|*,--no-|*,--no-c|*,--no-ch|*,--no-che|*,--no-chec|\
 	*,--no-check|*,--no-checko|*,--no-checkou|*,--no-checkout)
 	  no_checkout=yes ;;
 	*,--na|*,--nak|*,--nake|*,--naked|\
 	*,-b|*,--b|*,--ba|*,--bar|*,--bare) bare=yes ;;
 	*,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
         *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared)
           local_shared=yes; use_local=yes ;;
 	1,--template) usage ;;
 	*,--template)
 		shift; template="--template=$1" ;;
 	*,--template=*)
 	  template="$1" ;;
 	*,-q|*,--quiet) quiet=-q ;;
 	*,--use-separate-remote) ;;
 	*,--no-separate-remote)
 		die "clones are always made with separate-remote layout" ;;
 	1,--reference) usage ;;
 	*,--reference)
 		shift; reference="$1" ;;
 	*,--reference=*)
 		reference=`expr "z$1" : 'z--reference=\(.*\)'` ;;
 	*,-o|*,--or|*,--ori|*,--orig|*,--origi|*,--origin)
 		case "$2" in
 		'')
 		    usage ;;
 		*/*)
 		    die "'$2' is not suitable for an origin name"
 		esac
 		git-check-ref-format "heads/$2" ||
 		    die "'$2' is not suitable for a branch name"
 		test -z "$origin_override" ||
 		    die "Do not give more than one --origin options."
 		origin_override=yes
 		origin="$2"; shift
 		;;
 	1,-u|1,--upload-pack) usage ;;
 	*,-u|*,--upload-pack)
 		shift
 		upload_pack="--upload-pack=$1" ;;
 	*,--upload-pack=*)
 		upload_pack=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 	1,--depth) usage;;
 	*,--depth)
 		shift
 		depth="--depth=$1";;
 	*,-*) usage ;;
 	*) break ;;
 	esac
 do
 	shift
 done

 repo="$1"
 test -n "$repo" ||
     die 'you must specify a repository to clone.'

 # --bare implies --no-checkout and --no-separate-remote
 if test yes = "$bare"
 then
 	if test yes = "$origin_override"
 	then
 		die '--bare and --origin $origin options are incompatible.'
 	fi
 	no_checkout=yes
 	use_separate_remote=
 fi

 if test -z "$origin"
 then
 	origin=origin
 fi

 # Turn the source into an absolute path if
 # it is local
 if base=$(get_repo_base "$repo"); then
 	repo="$base"
 	local=yes
 fi

 dir="$2"
 # Try using "humanish" part of source repo if user didn't specify one
 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 [ -e "$dir" ] && die "destination directory '$dir' already exists."
 mkdir -p "$dir" &&
 D=$(cd "$dir" && pwd) &&
 trap 'err=$?; cd ..; rm -rf "$D"; exit $err' 0
 case "$bare" in
 yes)
 	GIT_DIR="$D" ;;
 *)
 	GIT_DIR="$D/.git" ;;
 esac && export GIT_DIR && git-init ${template+"$template"} || usage

 if test -n "$reference"
 then
 	if test -d "$reference"
 	then
 		if test -d "$reference/.git/objects"
 		then
 			reference="$reference/.git"
 		fi
 		reference=$(cd "$reference" && pwd)
 		echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
 		(cd "$reference" && tar cf - refs) |
 		(cd "$GIT_DIR/refs" &&
 		 mkdir reference-tmp &&
 		 cd reference-tmp &&
 		 tar xf -)
 	else
 		die "reference repository '$reference' is not a local directory."
 	fi
 fi

 rm -f "$GIT_DIR/CLONE_HEAD"

 # We do local magic only when the user tells us to.
 case "$local,$use_local" in
 yes,yes)
 	( cd "$repo/objects" ) ||
 		die "-l flag seen but repository '$repo' is not local."

 	case "$local_shared" in
 	no)
 	    # See if we can hardlink and drop "l" if not.
 	    sample_file=$(cd "$repo" && \
 			  find objects -type f -print | sed -e 1q)

 	    # objects directory should not be empty since we are cloning!
 	    test -f "$repo/$sample_file" || exit

 	    l=
 	    if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
 	    then
 		    l=l
 	    fi &&
 	    rm -f "$GIT_DIR/objects/sample" &&
 	    cd "$repo" &&
 	    find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
 	    ;;
 	yes)
 	    mkdir -p "$GIT_DIR/objects/info"
 	    echo "$repo/objects" >> "$GIT_DIR/objects/info/alternates"
 	    ;;
 	esac
 	git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
 	;;
 *)
 	case "$repo" in
 	rsync://*)
 		case "$depth" in
 		"") ;;
 		*) die "shallow over rsync not supported" ;;
 		esac
 		rsync $quiet -av --ignore-existing  \
 			--exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
 		exit
 		# Look at objects/info/alternates for rsync -- http will
 		# support it natively and git native ones will do it on the
 		# remote end.  Not having that file is not a crime.
 		rsync -q "$repo/objects/info/alternates" \
 			"$GIT_DIR/TMP_ALT" 2>/dev/null ||
 			rm -f "$GIT_DIR/TMP_ALT"
 		if test -f "$GIT_DIR/TMP_ALT"
 		then
 		    ( cd "$D" &&
 		      . git-parse-remote &&
 		      resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
 		    while read alt
 		    do
 			case "$alt" in 'bad alternate: '*) die "$alt";; esac
 			case "$quiet" in
 			'')	echo >&2 "Getting alternate: $alt" ;;
 			esac
 			rsync $quiet -av --ignore-existing  \
 			    --exclude info "$alt" "$GIT_DIR/objects" || exit
 		    done
 		    rm -f "$GIT_DIR/TMP_ALT"
 		fi
 		git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
 		;;
 	https://*|http://*|ftp://*)
 		case "$depth" in
 		"") ;;
 		*) die "shallow over http or ftp not supported" ;;
 		esac
 		if test -z "@@NO_CURL@@"
 		then
 			clone_dumb_http "$repo" "$D"
 		else
 			die "http transport not supported, rebuild Git with curl support"
 		fi
 		;;
 	*)
 		case "$upload_pack" in
 		'') git-fetch-pack --all -k $quiet $depth "$repo" ;;
 		*) git-fetch-pack --all -k $quiet "$upload_pack" $depth "$repo" ;;
 		esac >"$GIT_DIR/CLONE_HEAD" ||
 			die "fetch-pack from '$repo' failed."
 		;;
 	esac
 	;;
 esac
 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"

 if test -f "$GIT_DIR/CLONE_HEAD"
 then
 	# Read git-fetch-pack -k output and store the remote branches.
 	if [ -n "$use_separate_remote" ]
 	then
 		branch_top="remotes/$origin"
 	else
 		branch_top="heads"
 	fi
 	tag_top="tags"
 	while read sha1 name
 	do
 		case "$name" in
 		*'^{}')
 			continue ;;
 		HEAD)
 			destname="REMOTE_HEAD" ;;
 		refs/heads/*)
 			destname="refs/$branch_top/${name#refs/heads/}" ;;
 		refs/tags/*)
 			destname="refs/$tag_top/${name#refs/tags/}" ;;
 		*)
 			continue ;;
 		esac
 		git-update-ref -m "clone: from $repo" "$destname" "$sha1" ""
 	done < "$GIT_DIR/CLONE_HEAD"
 fi

 cd "$D" || exit

 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
 then
 	# a non-bare repository is always in separate-remote layout
 	remote_top="refs/remotes/$origin"
 	head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 	case "$head_sha1" in
 	'ref: refs/'*)
 		# Uh-oh, the remote told us (http transport done against
 		# new style repository with a symref HEAD).
 		# Ideally we should skip the guesswork but for now
 		# opt for minimum change.
 		head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
 		head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
 		;;
 	esac

 	# The name under $remote_top the remote HEAD seems to point at.
 	head_points_at=$(
 		(
 			test -f "$GIT_DIR/$remote_top/master" && echo "master"
 			cd "$GIT_DIR/$remote_top" &&
 			find . -type f -print | sed -e 's/^\.\///'
 		) | (
 		done=f
 		while read name
 		do
 			test t = $done && continue
 			branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
 			if test "$head_sha1" = "$branch_tip"
 			then
 				echo "$name"
 				done=t
 			fi
 		done
 		)
 	)

 	# Write out remote.$origin config, and update our "$head_points_at".
 	case "$head_points_at" in
 	?*)
 		# Local default branch
 		git-symbolic-ref HEAD "refs/heads/$head_points_at" &&

 		# Tracking branch for the primary branch at the remote.
 		origin_track="$remote_top/$head_points_at" &&
 		git-update-ref HEAD "$head_sha1" &&

 		# Upstream URL
 		git-config remote."$origin".url "$repo" &&

 		# Set up the mappings to track the remote branches.
 		git-config remote."$origin".fetch \
 			"+refs/heads/*:$remote_top/*" '^$' &&
 		rm -f "refs/remotes/$origin/HEAD"
 		git-symbolic-ref "refs/remotes/$origin/HEAD" \
 			"refs/remotes/$origin/$head_points_at" &&

 		git-config branch."$head_points_at".remote "$origin" &&
 		git-config branch."$head_points_at".merge "refs/heads/$head_points_at"
 	esac

 	case "$no_checkout" in
 	'')
 		test "z$quiet" = z && v=-v || v=
 		git-read-tree -m -u $v HEAD HEAD
 	esac
 fi
 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"

 trap - 0
	#!/bin/sh
	#
	# Copyright (c) 2005, Linus Torvalds
	# Copyright (c) 2005, Junio C Hamano
	#
	# Clone a repository into a different directory that does not yet exist.

	# See git-sh-setup why.
	unset CDPATH

	die() {
	echo >&2 "$@"
	exit 1
	}

	usage() {
	die "Usage: $0 [--template=<template_directory>] [--reference <reference-repo>] [--bare] [-l [-s]] [-q] [-u <upload-pack>] [--origin <name>] [--depth <n>] [-n] <repo> [<dir>]"
	}

	get_repo_base() {
	(cd "$1" && (cd .git ; pwd)) 2> /dev/null
	}

	if [ -n "$GIT_SSL_NO_VERIFY" ]; then
	curl_extra_args="-k"
	fi

	http_fetch () {
	# $1 = Remote, $2 = Local
	curl -nsfL $curl_extra_args "$1" >"$2"
	}

	clone_dumb_http () {
	# $1 - remote, $2 - local
	cd "$2" &&
	clone_tmp="$GIT_DIR/clone-tmp" &&
	mkdir -p "$clone_tmp" \|\| exit 1
	if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
	"`git-config --bool http.noEPSV`" = true ]; then
	curl_extra_args="${curl_extra_args} --disable-epsv"
	fi
	http_fetch "$1/info/refs" "$clone_tmp/refs" \|\|
	die "Cannot get remote repository information.
	Perhaps git-update-server-info needs to be run there?"
	while read sha1 refname
	do
	name=`expr "z$refname" : 'zrefs/\(.*\)'` &&
	case "$name" in
	^) continue;;
	esac
	case "$bare,$name" in
	yes,* \| ,heads/* \| ,tags/*) ;;
	*) continue ;;
	esac
	if test -n "$use_separate_remote" &&
	branch_name=`expr "z$name" : 'zheads/\(.*\)'`
	then
	tname="remotes/$origin/$branch_name"
	else
	tname=$name
	fi
	git-http-fetch -v -a -w "$tname" "$name" "$1/" \|\| exit 1
	done <"$clone_tmp/refs"
	rm -fr "$clone_tmp"
	http_fetch "$1/HEAD" "$GIT_DIR/REMOTE_HEAD" \|\|
	rm -f "$GIT_DIR/REMOTE_HEAD"
	}

	quiet=
	local=no
	use_local=no
	local_shared=no
	unset template
	no_checkout=
	upload_pack=
	bare=
	reference=
	origin=
	origin_override=
	use_separate_remote=t
	depth=
	while
	case "$#,$1" in
	0,*) break ;;
	,-n\|,--no\|,--no-\|,--no-c\|,--no-ch\|,--no-che\|*,--no-chec\|\
	,--no-check\|,--no-checko\|,--no-checkou\|,--no-checkout)
	no_checkout=yes ;;
	,--na\|,--nak\|,--nake\|,--naked\|\
	,-b\|,--b\|,--ba\|,--bar\|*,--bare) bare=yes ;;
	,-l\|,--l\|,--lo\|,--loc\|,--loca\|,--local) use_local=yes ;;
	,-s\|,--s\|,--sh\|,--sha\|,--shar\|,--share\|*,--shared)
	local_shared=yes; use_local=yes ;;
	1,--template) usage ;;
	*,--template)
	shift; template="--template=$1" ;;
	,--template=)
	template="$1" ;;
	,-q\|,--quiet) quiet=-q ;;
	*,--use-separate-remote) ;;
	*,--no-separate-remote)
	die "clones are always made with separate-remote layout" ;;
	1,--reference) usage ;;
	*,--reference)
	shift; reference="$1" ;;
	,--reference=)
	reference=`expr "z$1" : 'z--reference=\(.*\)'` ;;
	,-o\|,--or\|,--ori\|,--orig\|,--origi\|,--origin)
	case "$2" in
	'')
	usage ;;
	/)
	die "'$2' is not suitable for an origin name"
	esac
	git-check-ref-format "heads/$2" \|\|
	die "'$2' is not suitable for a branch name"
	test -z "$origin_override" \|\|
	die "Do not give more than one --origin options."
	origin_override=yes
	origin="$2"; shift
	;;
	1,-u\|1,--upload-pack) usage ;;
	,-u\|,--upload-pack)
	shift
	upload_pack="--upload-pack=$1" ;;
	,--upload-pack=)
	upload_pack=--upload-pack=$(expr "z$1" : 'z-[^=]=\(.\)') ;;
	1,--depth) usage;;
	*,--depth)
	shift
	depth="--depth=$1";;
	,-) usage ;;
	*) break ;;
	esac
	do
	shift
	done

	repo="$1"
	test -n "$repo" \|\|
	die 'you must specify a repository to clone.'

	# --bare implies --no-checkout and --no-separate-remote
	if test yes = "$bare"
	then
	if test yes = "$origin_override"
	then
	die '--bare and --origin $origin options are incompatible.'
	fi
	no_checkout=yes
	use_separate_remote=
	fi

	if test -z "$origin"
	then
	origin=origin
	fi

	# Turn the source into an absolute path if
	# it is local
	if base=$(get_repo_base "$repo"); then
	repo="$base"
	local=yes
	fi

	dir="$2"
	# Try using "humanish" part of source repo if user didn't specify one
	[ -z "$dir" ] && dir=$(echo "$repo" \| sed -e 's\|/$\|\|' -e 's\|:/\.git$\|\|' -e 's\|.*[/:]\|\|g')
	[ -e "$dir" ] && die "destination directory '$dir' already exists."
	mkdir -p "$dir" &&
	D=$(cd "$dir" && pwd) &&
	trap 'err=$?; cd ..; rm -rf "$D"; exit $err' 0
	case "$bare" in
	yes)
	GIT_DIR="$D" ;;
	*)
	GIT_DIR="$D/.git" ;;
	esac && export GIT_DIR && git-init ${template+"$template"} \|\| usage

	if test -n "$reference"
	then
	if test -d "$reference"
	then
	if test -d "$reference/.git/objects"
	then
	reference="$reference/.git"
	fi
	reference=$(cd "$reference" && pwd)
	echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
	(cd "$reference" && tar cf - refs) \|
	(cd "$GIT_DIR/refs" &&
	mkdir reference-tmp &&
	cd reference-tmp &&
	tar xf -)
	else
	die "reference repository '$reference' is not a local directory."
	fi
	fi

	rm -f "$GIT_DIR/CLONE_HEAD"

	# We do local magic only when the user tells us to.
	case "$local,$use_local" in
	yes,yes)
	( cd "$repo/objects" ) \|\|
	die "-l flag seen but repository '$repo' is not local."

	case "$local_shared" in
	no)
	# See if we can hardlink and drop "l" if not.
	sample_file=$(cd "$repo" && \
	find objects -type f -print \| sed -e 1q)

	# objects directory should not be empty since we are cloning!
	test -f "$repo/$sample_file" \|\| exit

	l=
	if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
	then
	l=l
	fi &&
	rm -f "$GIT_DIR/objects/sample" &&
	cd "$repo" &&
	find objects -depth -print \| cpio -pumd$l "$GIT_DIR/" \|\| exit 1
	;;
	yes)
	mkdir -p "$GIT_DIR/objects/info"
	echo "$repo/objects" >> "$GIT_DIR/objects/info/alternates"
	;;
	esac
	git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" \|\| exit 1
	;;
	*)
	case "$repo" in
	rsync://*)
	case "$depth" in
	"") ;;
	*) die "shallow over rsync not supported" ;;
	esac
	rsync $quiet -av --ignore-existing \
	--exclude info "$repo/objects/" "$GIT_DIR/objects/" \|\|
	exit
	# Look at objects/info/alternates for rsync -- http will
	# support it natively and git native ones will do it on the
	# remote end. Not having that file is not a crime.
	rsync -q "$repo/objects/info/alternates" \
	"$GIT_DIR/TMP_ALT" 2>/dev/null \|\|
	rm -f "$GIT_DIR/TMP_ALT"
	if test -f "$GIT_DIR/TMP_ALT"
	then
	( cd "$D" &&
	. git-parse-remote &&
	resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) \|
	while read alt
	do
	case "$alt" in 'bad alternate: '*) die "$alt";; esac
	case "$quiet" in
	'') echo >&2 "Getting alternate: $alt" ;;
	esac
	rsync $quiet -av --ignore-existing \
	--exclude info "$alt" "$GIT_DIR/objects" \|\| exit
	done
	rm -f "$GIT_DIR/TMP_ALT"
	fi
	git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" \|\| exit 1
	;;
	https://\|http://\|ftp://*)
	case "$depth" in
	"") ;;
	*) die "shallow over http or ftp not supported" ;;
	esac
	if test -z "@@NO_CURL@@"
	then
	clone_dumb_http "$repo" "$D"
	else
	die "http transport not supported, rebuild Git with curl support"
	fi
	;;
	*)
	case "$upload_pack" in
	'') git-fetch-pack --all -k $quiet $depth "$repo" ;;
	*) git-fetch-pack --all -k $quiet "$upload_pack" $depth "$repo" ;;
	esac >"$GIT_DIR/CLONE_HEAD" \|\|
	die "fetch-pack from '$repo' failed."
	;;
	esac
	;;
	esac
	test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"

	if test -f "$GIT_DIR/CLONE_HEAD"
	then
	# Read git-fetch-pack -k output and store the remote branches.
	if [ -n "$use_separate_remote" ]
	then
	branch_top="remotes/$origin"
	else
	branch_top="heads"
	fi
	tag_top="tags"
	while read sha1 name
	do
	case "$name" in
	*'^{}')
	continue ;;
	HEAD)
	destname="REMOTE_HEAD" ;;
	refs/heads/*)
	destname="refs/$branch_top/${name#refs/heads/}" ;;
	refs/tags/*)
	destname="refs/$tag_top/${name#refs/tags/}" ;;
	*)
	continue ;;
	esac
	git-update-ref -m "clone: from $repo" "$destname" "$sha1" ""
	done < "$GIT_DIR/CLONE_HEAD"
	fi

	cd "$D" \|\| exit

	if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
	then
	# a non-bare repository is always in separate-remote layout
	remote_top="refs/remotes/$origin"
	head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
	case "$head_sha1" in
	'ref: refs/'*)
	# Uh-oh, the remote told us (http transport done against
	# new style repository with a symref HEAD).
	# Ideally we should skip the guesswork but for now
	# opt for minimum change.
	head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
	head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
	;;
	esac

	# The name under $remote_top the remote HEAD seems to point at.
	head_points_at=$(
	(
	test -f "$GIT_DIR/$remote_top/master" && echo "master"
	cd "$GIT_DIR/$remote_top" &&
	find . -type f -print \| sed -e 's/^\.\///'
	) \| (
	done=f
	while read name
	do
	test t = $done && continue
	branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
	if test "$head_sha1" = "$branch_tip"
	then
	echo "$name"
	done=t
	fi
	done
	)
	)

	# Write out remote.$origin config, and update our "$head_points_at".
	case "$head_points_at" in
	?*)
	# Local default branch
	git-symbolic-ref HEAD "refs/heads/$head_points_at" &&

	# Tracking branch for the primary branch at the remote.
	origin_track="$remote_top/$head_points_at" &&
	git-update-ref HEAD "$head_sha1" &&

	# Upstream URL
	git-config remote."$origin".url "$repo" &&

	# Set up the mappings to track the remote branches.
	git-config remote."$origin".fetch \
	"+refs/heads/:$remote_top/" '^$' &&
	rm -f "refs/remotes/$origin/HEAD"
	git-symbolic-ref "refs/remotes/$origin/HEAD" \
	"refs/remotes/$origin/$head_points_at" &&

	git-config branch."$head_points_at".remote "$origin" &&
	git-config branch."$head_points_at".merge "refs/heads/$head_points_at"
	esac

	case "$no_checkout" in
	'')
	test "z$quiet" = z && v=-v \|\| v=
	git-read-tree -m -u $v HEAD HEAD
	esac
	fi
	rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"

	trap - 0