[thirdparty/git.git] / git-filter-branch.sh

#!/bin/sh
#
# Rewrite revision history
# Copyright (c) Petr Baudis, 2006
# Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007
#
# Lets you rewrite the revision history of the current branch, creating
# a new branch. You can specify a number of filters to modify the commits,
# files and trees.

# The following functions will also be available in the commit filter:

functions=$(cat << \EOF
warn () {
        echo "$*" >&2
}

map()
{
	# if it was not rewritten, take the original
	if test -r "$workdir/../map/$1"
	then
		cat "$workdir/../map/$1"
	else
		echo "$1"
	fi
}

# if you run 'skip_commit "$@"' in a commit filter, it will print
# the (mapped) parents, effectively skipping the commit.

skip_commit()
{
	shift;
	while [ -n "$1" ];
	do
		shift;
		map "$1";
		shift;
	done;
}

# override die(): this version puts in an extra line break, so that
# the progress is still visible

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

eval "$functions"

# When piped a commit, output a script to set the ident of either
# "author" or "committer

set_ident () {
	lid="$(echo "$1" | tr "[A-Z]" "[a-z]")"
	uid="$(echo "$1" | tr "[a-z]" "[A-Z]")"
	pick_id_script='
		/^'$lid' /{
			s/'\''/'\''\\'\'\''/g
			h
			s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/
			s/'\''/'\''\'\'\''/g
			s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p

			g
			s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
			s/'\''/'\''\'\'\''/g
			s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p

			g
			s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
			s/'\''/'\''\'\'\''/g
			s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p

			q
		}
	'

	LANG=C LC_ALL=C sed -ne "$pick_id_script"
	# Ensure non-empty id name.
	echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
}

USAGE="[--env-filter <command>] [--tree-filter <command>] \
[--index-filter <command>] [--parent-filter <command>] \
[--msg-filter <command>] [--commit-filter <command>] \
[--tag-name-filter <command>] [--subdirectory-filter <directory>] \
[--original <namespace>] [-d <directory>] [-f | --force] \
[<rev-list options>...]"

OPTIONS_SPEC=
. git-sh-setup

if [ "$(is_bare_repository)" = false ]; then
	git diff-files --quiet &&
	git diff-index --cached --quiet HEAD -- ||
	die "Cannot rewrite branch(es) with a dirty working directory."
fi

tempdir=.git-rewrite
filter_env=
filter_tree=
filter_index=
filter_parent=
filter_msg=cat
filter_commit='git commit-tree "$@"'
filter_tag_name=
filter_subdir=
orig_namespace=refs/original/
force=
while :
do
	case "$1" in
	--)
		shift
		break
		;;
	--force|-f)
		shift
		force=t
		continue
		;;
	-*)
		;;
	*)
		break;
	esac

	# all switches take one argument
	ARG="$1"
	case "$#" in 1) usage ;; esac
	shift
	OPTARG="$1"
	shift

	case "$ARG" in
	-d)
		tempdir="$OPTARG"
		;;
	--env-filter)
		filter_env="$OPTARG"
		;;
	--tree-filter)
		filter_tree="$OPTARG"
		;;
	--index-filter)
		filter_index="$OPTARG"
		;;
	--parent-filter)
		filter_parent="$OPTARG"
		;;
	--msg-filter)
		filter_msg="$OPTARG"
		;;
	--commit-filter)
		filter_commit="$functions; $OPTARG"
		;;
	--tag-name-filter)
		filter_tag_name="$OPTARG"
		;;
	--subdirectory-filter)
		filter_subdir="$OPTARG"
		;;
	--original)
		orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/
		;;
	*)
		usage
		;;
	esac
done

case "$force" in
t)
	rm -rf "$tempdir"
;;
'')
	test -d "$tempdir" &&
		die "$tempdir already exists, please remove it"
esac
mkdir -p "$tempdir/t" &&
tempdir="$(cd "$tempdir"; pwd)" &&
cd "$tempdir/t" &&
workdir="$(pwd)" ||
die ""

# Remove tempdir on exit
trap 'cd ../..; rm -rf "$tempdir"' 0

# Make sure refs/original is empty
git for-each-ref > "$tempdir"/backup-refs
while read sha1 type name
do
	case "$force,$name" in
	,$orig_namespace*)
		die "Namespace $orig_namespace not empty"
	;;
	t,$orig_namespace*)
		git update-ref -d "$name" $sha1
	;;
	esac
done < "$tempdir"/backup-refs

ORIG_GIT_DIR="$GIT_DIR"
ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
GIT_WORK_TREE=.
export GIT_DIR GIT_WORK_TREE

# The refs should be updated if their heads were rewritten
git rev-parse --no-flags --revs-only --symbolic-full-name --default HEAD "$@" |
sed -e '/^^/d' >"$tempdir"/heads

test -s "$tempdir"/heads ||
	die "Which ref do you want to rewrite?"

GIT_INDEX_FILE="$(pwd)/../index"
export GIT_INDEX_FILE
git read-tree || die "Could not seed the index"

ret=0

# map old->new commit ids for rewriting parents
mkdir ../map || die "Could not create map/ directory"

case "$filter_subdir" in
"")
	git rev-list --reverse --topo-order --default HEAD \
		--parents --simplify-merges "$@"
	;;
*)
	git rev-list --reverse --topo-order --default HEAD \
		--parents --simplify-merges "$@" -- "$filter_subdir"
esac > ../revs || die "Could not get the commits"
commits=$(wc -l <../revs | tr -d " ")

test $commits -eq 0 && die "Found nothing to rewrite"

# Rewrite the commits

i=0
while read commit parents; do
	i=$(($i+1))
	printf "\rRewrite $commit ($i/$commits)"

	case "$filter_subdir" in
	"")
		git read-tree -i -m $commit
		;;
	*)
		# The commit may not have the subdirectory at all
		err=$(git read-tree -i -m $commit:"$filter_subdir" 2>&1) || {
			if ! git rev-parse -q --verify $commit:"$filter_subdir"
			then
				rm -f "$GIT_INDEX_FILE"
			else
				echo >&2 "$err"
				false
			fi
		}
	esac || die "Could not initialize the index"

	GIT_COMMIT=$commit
	export GIT_COMMIT
	git cat-file commit "$commit" >../commit ||
		die "Cannot read commit $commit"

	eval "$(set_ident AUTHOR <../commit)" ||
		die "setting author failed for commit $commit"
	eval "$(set_ident COMMITTER <../commit)" ||
		die "setting committer failed for commit $commit"
	eval "$filter_env" < /dev/null ||
		die "env filter failed: $filter_env"

	if [ "$filter_tree" ]; then
		git checkout-index -f -u -a ||
			die "Could not checkout the index"
		# files that $commit removed are now still in the working tree;
		# remove them, else they would be added again
		git clean -d -q -f -x
		eval "$filter_tree" < /dev/null ||
			die "tree filter failed: $filter_tree"

		(
			git diff-index -r --name-only $commit
			git ls-files --others
		) |
		git update-index --add --replace --remove --stdin
	fi

	eval "$filter_index" < /dev/null ||
		die "index filter failed: $filter_index"

	parentstr=
	for parent in $parents; do
		for reparent in $(map "$parent"); do
			parentstr="$parentstr -p $reparent"
		done
	done
	if [ "$filter_parent" ]; then
		parentstr="$(echo "$parentstr" | eval "$filter_parent")" ||
				die "parent filter failed: $filter_parent"
	fi

	sed -e '1,/^$/d' <../commit | \
		eval "$filter_msg" > ../message ||
			die "msg filter failed: $filter_msg"
	@SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
		$(git write-tree) $parentstr < ../message > ../map/$commit
done <../revs

# In case of a subdirectory filter, it is possible that a specified head
# is not in the set of rewritten commits, because it was pruned by the
# revision walker.  Fix it by mapping these heads to the unique nearest
# ancestor that survived the pruning.

if test "$filter_subdir"
then
	while read ref
	do
		sha1=$(git rev-parse "$ref"^0)
		test -f "$workdir"/../map/$sha1 && continue
		ancestor=$(git rev-list --simplify-merges -1 \
				$ref -- "$filter_subdir")
		test "$ancestor" && echo $(map $ancestor) >> "$workdir"/../map/$sha1
	done < "$tempdir"/heads
fi

# Finally update the refs

_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
echo
while read ref
do
	# avoid rewriting a ref twice
	test -f "$orig_namespace$ref" && continue

	sha1=$(git rev-parse "$ref"^0)
	rewritten=$(map $sha1)

	test $sha1 = "$rewritten" &&
		warn "WARNING: Ref '$ref' is unchanged" &&
		continue

	case "$rewritten" in
	'')
		echo "Ref '$ref' was deleted"
		git update-ref -m "filter-branch: delete" -d "$ref" $sha1 ||
			die "Could not delete $ref"
	;;
	$_x40)
		echo "Ref '$ref' was rewritten"
		if ! git update-ref -m "filter-branch: rewrite" \
					"$ref" $rewritten $sha1 2>/dev/null; then
			if test $(git cat-file -t "$ref") = tag; then
				if test -z "$filter_tag_name"; then
					warn "WARNING: You said to rewrite tagged commits, but not the corresponding tag."
					warn "WARNING: Perhaps use '--tag-name-filter cat' to rewrite the tag."
				fi
			else
				die "Could not rewrite $ref"
			fi
		fi
	;;
	*)
		# NEEDSWORK: possibly add -Werror, making this an error
		warn "WARNING: '$ref' was rewritten into multiple commits:"
		warn "$rewritten"
		warn "WARNING: Ref '$ref' points to the first one now."
		rewritten=$(echo "$rewritten" | head -n 1)
		git update-ref -m "filter-branch: rewrite to first" \
				"$ref" $rewritten $sha1 ||
			die "Could not rewrite $ref"
	;;
	esac
	git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1
done < "$tempdir"/heads

# TODO: This should possibly go, with the semantics that all positive given
#       refs are updated, and their original heads stored in refs/original/
# Filter tags

if [ "$filter_tag_name" ]; then
	git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags |
	while read sha1 type ref; do
		ref="${ref#refs/tags/}"
		# XXX: Rewrite tagged trees as well?
		if [ "$type" != "commit" -a "$type" != "tag" ]; then
			continue;
		fi

		if [ "$type" = "tag" ]; then
			# Dereference to a commit
			sha1t="$sha1"
			sha1="$(git rev-parse "$sha1"^{commit} 2>/dev/null)" || continue
		fi

		[ -f "../map/$sha1" ] || continue
		new_sha1="$(cat "../map/$sha1")"
		GIT_COMMIT="$sha1"
		export GIT_COMMIT
		new_ref="$(echo "$ref" | eval "$filter_tag_name")" ||
			die "tag name filter failed: $filter_tag_name"

		echo "$ref -> $new_ref ($sha1 -> $new_sha1)"

		if [ "$type" = "tag" ]; then
			new_sha1=$( ( printf 'object %s\ntype commit\ntag %s\n' \
						"$new_sha1" "$new_ref"
				git cat-file tag "$ref" |
				sed -n \
				    -e "1,/^$/{
					  /^object /d
					  /^type /d
					  /^tag /d
					}" \
				    -e '/^-----BEGIN PGP SIGNATURE-----/q' \
				    -e 'p' ) |
				git mktag) ||
				die "Could not create new tag object for $ref"
			if git cat-file tag "$ref" | \
			   grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
			then
				warn "gpg signature stripped from tag object $sha1t"
			fi
		fi

		git update-ref "refs/tags/$new_ref" "$new_sha1" ||
			die "Could not write tag $new_ref"
	done
fi

cd ../..
rm -rf "$tempdir"

trap - 0

if [ "$(is_bare_repository)" = false ]; then
	unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
	test -z "$ORIG_GIT_DIR" || {
		GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR
	}
	test -z "$ORIG_GIT_WORK_TREE" || {
		GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" &&
		export GIT_WORK_TREE
	}
	test -z "$ORIG_GIT_INDEX_FILE" || {
		GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" &&
		export GIT_INDEX_FILE
	}
	git read-tree -u -m HEAD
fi

exit $ret
Commit	Line	Data
6f6826c5 JS	1	#!/bin/sh
	2	#
	3	# Rewrite revision history
	4	# Copyright (c) Petr Baudis, 2006
	5	# Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007
	6	#
c401b33c JS	7	# Lets you rewrite the revision history of the current branch, creating
	8	# a new branch. You can specify a number of filters to modify the commits,
	9	# files and trees.
6f6826c5	10
16ed34ad JS	11	# The following functions will also be available in the commit filter:
	12
	13	functions=$(cat << \EOF
b5669a05 SP	14	warn () {
	15	echo "$*" >&2
	16	}
	17
6f6826c5 JS	18	map()
6f6826c5 JS	19	{
3520e1e8	20	# if it was not rewritten, take the original
c57a3494 JS	21	if test -r "$workdir/../map/$1"
	22	then
	23	cat "$workdir/../map/$1"
	24	else
	25	echo "$1"
	26	fi
6f6826c5 JS	27	}
6f6826c5 JS	28
f95eef15 JS	29	# if you run 'skip_commit "$@"' in a commit filter, it will print
	30	# the (mapped) parents, effectively skipping the commit.
	31
	32	skip_commit()
	33	{
	34	shift;
	35	while [ -n "$1" ];
	36	do
	37	shift;
	38	map "$1";
	39	shift;
	40	done;
	41	}
	42
8c1ce0f4 JS	43	# override die(): this version puts in an extra line break, so that
	44	# the progress is still visible
	45
	46	die()
	47	{
	48	echo >&2
	49	echo "$*" >&2
	50	exit 1
	51	}
16ed34ad JS	52	EOF
	53	)
	54
	55	eval "$functions"
8c1ce0f4	56
6f6826c5 JS	57	# When piped a commit, output a script to set the ident of either
	58	# "author" or "committer
	59
	60	set_ident () {
40a7ce64 JK	61	lid="$(echo "$1" \| tr "[A-Z]" "[a-z]")"
40a7ce64 JK	62	uid="$(echo "$1" \| tr "[a-z]" "[A-Z]")"
6f6826c5 JS	63	pick_id_script='
	64	/^'$lid' /{
	65	s/'\''/'\''\\'\'\''/g
	66	h
	67	s/^'$lid' \([^<]\) <[^>]> .*$/\1/
	68	s/'\''/'\''\'\'\''/g
3addc94a	69	s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p
6f6826c5 JS	70
	71	g
	72	s/^'$lid' [^<]* <\([^>]\)> .$/\1/
	73	s/'\''/'\''\'\'\''/g
3addc94a	74	s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p
6f6826c5 JS	75
	76	g
	77	s/^'$lid' [^<]* <[^>]> \(.\)$/\1/
	78	s/'\''/'\''\'\'\''/g
3addc94a	79	s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p
6f6826c5 JS	80
	81	q
	82	}
	83	'
	84
	85	LANG=C LC_ALL=C sed -ne "$pick_id_script"
	86	# Ensure non-empty id name.
3addc94a	87	echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
6f6826c5 JS	88	}
6f6826c5 JS	89
7e0f1704 JS	90	USAGE="[--env-filter <command>] [--tree-filter <command>] \
	91	[--index-filter <command>] [--parent-filter <command>] \
	92	[--msg-filter <command>] [--commit-filter <command>] \
	93	[--tag-name-filter <command>] [--subdirectory-filter <directory>] \
	94	[--original <namespace>] [-d <directory>] [-f \| --force] \
bb8eebb9	95	[<rev-list options>...]"
7e0f1704	96
8f321a39	97	OPTIONS_SPEC=
7e0f1704 JS	98	. git-sh-setup
7e0f1704 JS	99
a4661b01 PB	100	if [ "$(is_bare_repository)" = false ]; then
a4661b01 PB	101	git diff-files --quiet &&
38762c47	102	git diff-index --cached --quiet HEAD -- \|\|
46eb449c	103	die "Cannot rewrite branch(es) with a dirty working directory."
a4661b01	104	fi
46eb449c	105
6f6826c5	106	tempdir=.git-rewrite
6f6826c5 JS	107	filter_env=
	108	filter_tree=
	109	filter_index=
	110	filter_parent=
	111	filter_msg=cat
5be60078	112	filter_commit='git commit-tree "$@"'
6f6826c5	113	filter_tag_name=
685ef546	114	filter_subdir=
dfd05e38 JS	115	orig_namespace=refs/original/
dfd05e38 JS	116	force=
822f7c73	117	while :
6f6826c5 JS	118	do
	119	case "$1" in
	120	--)
	121	shift
	122	break
	123	;;
dfd05e38 JS	124	--force\|-f)
	125	shift
	126	force=t
	127	continue
	128	;;
6f6826c5 JS	129	-*)
	130	;;
	131	*)
	132	break;
	133	esac
	134
	135	# all switches take one argument
	136	ARG="$1"
	137	case "$#" in 1) usage ;; esac
	138	shift
	139	OPTARG="$1"
	140	shift
	141
	142	case "$ARG" in
	143	-d)
	144	tempdir="$OPTARG"
	145	;;
6f6826c5 JS	146	--env-filter)
	147	filter_env="$OPTARG"
	148	;;
	149	--tree-filter)
	150	filter_tree="$OPTARG"
	151	;;
	152	--index-filter)
	153	filter_index="$OPTARG"
	154	;;
	155	--parent-filter)
	156	filter_parent="$OPTARG"
	157	;;
	158	--msg-filter)
	159	filter_msg="$OPTARG"
	160	;;
	161	--commit-filter)
16ed34ad	162	filter_commit="$functions; $OPTARG"
6f6826c5 JS	163	;;
	164	--tag-name-filter)
	165	filter_tag_name="$OPTARG"
	166	;;
685ef546 JS	167	--subdirectory-filter)
	168	filter_subdir="$OPTARG"
	169	;;
dfd05e38	170	--original)
55ced83d	171	orig_namespace=$(expr "$OPTARG/" : '\(.[^/]\)/$')/
dfd05e38	172	;;
6f6826c5 JS	173	*)
	174	usage
	175	;;
	176	esac
	177	done
	178
dfd05e38 JS	179	case "$force" in
	180	t)
	181	rm -rf "$tempdir"
	182	;;
	183	'')
	184	test -d "$tempdir" &&
	185	die "$tempdir already exists, please remove it"
	186	esac
af580e9c	187	mkdir -p "$tempdir/t" &&
dfd05e38	188	tempdir="$(cd "$tempdir"; pwd)" &&
af580e9c JS	189	cd "$tempdir/t" &&
	190	workdir="$(pwd)" \|\|
	191	die ""
6f6826c5	192
def16e71 BC	193	# Remove tempdir on exit
	194	trap 'cd ../..; rm -rf "$tempdir"' 0
	195
dfd05e38 JS	196	# Make sure refs/original is empty
	197	git for-each-ref > "$tempdir"/backup-refs
	198	while read sha1 type name
	199	do
	200	case "$force,$name" in
	201	,$orig_namespace*)
	202	die "Namespace $orig_namespace not empty"
	203	;;
	204	t,$orig_namespace*)
	205	git update-ref -d "$name" $sha1
	206	;;
	207	esac
	208	done < "$tempdir"/backup-refs
	209
46eb449c JS	210	ORIG_GIT_DIR="$GIT_DIR"
	211	ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
	212	ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
3addc94a JS	213	GIT_WORK_TREE=.
3addc94a JS	214	export GIT_DIR GIT_WORK_TREE
6f6826c5	215
418fa3a5	216	# The refs should be updated if their heads were rewritten
0f047f3b	217	git rev-parse --no-flags --revs-only --symbolic-full-name --default HEAD "$@" \|
418fa3a5	218	sed -e '/^^/d' >"$tempdir"/heads
dfd05e38 JS	219
	220	test -s "$tempdir"/heads \|\|
	221	die "Which ref do you want to rewrite?"
	222
3addc94a JS	223	GIT_INDEX_FILE="$(pwd)/../index"
3addc94a JS	224	export GIT_INDEX_FILE
af580e9c	225	git read-tree \|\| die "Could not seed the index"
6f6826c5 JS	226
	227	ret=0
	228
af580e9c JS	229	# map old->new commit ids for rewriting parents
af580e9c JS	230	mkdir ../map \|\| die "Could not create map/ directory"
6f6826c5	231
685ef546 JS	232	case "$filter_subdir" in
685ef546 JS	233	"")
5be60078	234	git rev-list --reverse --topo-order --default HEAD \
f34a9416	235	--parents --simplify-merges "$@"
685ef546 JS	236	;;
685ef546 JS	237	*)
5be60078	238	git rev-list --reverse --topo-order --default HEAD \
f34a9416	239	--parents --simplify-merges "$@" -- "$filter_subdir"
af580e9c	240	esac > ../revs \|\| die "Could not get the commits"
9d6f220c	241	commits=$(wc -l <../revs \| tr -d " ")
6f6826c5 JS	242
	243	test $commits -eq 0 && die "Found nothing to rewrite"
	244
dfd05e38 JS	245	# Rewrite the commits
dfd05e38 JS	246
6f6826c5	247	i=0
813b4734	248	while read commit parents; do
c12764b8	249	i=$(($i+1))
5efb48b5	250	printf "\rRewrite $commit ($i/$commits)"
6f6826c5	251
685ef546 JS	252	case "$filter_subdir" in
685ef546 JS	253	"")
5be60078	254	git read-tree -i -m $commit
685ef546 JS	255	;;
685ef546 JS	256	*)
5b044ac3 JH	257	# The commit may not have the subdirectory at all
5b044ac3 JH	258	err=$(git read-tree -i -m $commit:"$filter_subdir" 2>&1) \|\| {
d69da76d	259	if ! git rev-parse -q --verify $commit:"$filter_subdir"
5b044ac3 JH	260	then
	261	rm -f "$GIT_INDEX_FILE"
	262	else
	263	echo >&2 "$err"
	264	false
	265	fi
	266	}
af580e9c	267	esac \|\| die "Could not initialize the index"
6f6826c5	268
3addc94a JS	269	GIT_COMMIT=$commit
3addc94a JS	270	export GIT_COMMIT
af580e9c JS	271	git cat-file commit "$commit" >../commit \|\|
af580e9c JS	272	die "Cannot read commit $commit"
6f6826c5	273
8c1ce0f4 JS	274	eval "$(set_ident AUTHOR <../commit)" \|\|
	275	die "setting author failed for commit $commit"
	276	eval "$(set_ident COMMITTER <../commit)" \|\|
	277	die "setting committer failed for commit $commit"
	278	eval "$filter_env" < /dev/null \|\|
	279	die "env filter failed: $filter_env"
6f6826c5 JS	280
6f6826c5 JS	281	if [ "$filter_tree" ]; then
af580e9c JS	282	git checkout-index -f -u -a \|\|
af580e9c JS	283	die "Could not checkout the index"
6f6826c5 JS	284	# files that $commit removed are now still in the working tree;
6f6826c5 JS	285	# remove them, else they would be added again
6a589fda	286	git clean -d -q -f -x
8c1ce0f4 JS	287	eval "$filter_tree" < /dev/null \|\|
	288	die "tree filter failed: $filter_tree"
	289
1fe32cb9 JH	290	(
	291	git diff-index -r --name-only $commit
	292	git ls-files --others
	293	) \|
	294	git update-index --add --replace --remove --stdin
6f6826c5 JS	295	fi
6f6826c5 JS	296
8c1ce0f4 JS	297	eval "$filter_index" < /dev/null \|\|
8c1ce0f4 JS	298	die "index filter failed: $filter_index"
6f6826c5 JS	299
6f6826c5 JS	300	parentstr=
813b4734	301	for parent in $parents; do
3520e1e8 JS	302	for reparent in $(map "$parent"); do
	303	parentstr="$parentstr -p $reparent"
	304	done
6f6826c5 JS	305	done
6f6826c5 JS	306	if [ "$filter_parent" ]; then
8c1ce0f4 JS	307	parentstr="$(echo "$parentstr" \| eval "$filter_parent")" \|\|
8c1ce0f4 JS	308	die "parent filter failed: $filter_parent"
6f6826c5 JS	309	fi
	310
	311	sed -e '1,/^$/d' <../commit \| \
8c1ce0f4 JS	312	eval "$filter_msg" > ../message \|\|
8c1ce0f4 JS	313	die "msg filter failed: $filter_msg"
4bf9f27d	314	@SHELL_PATH@ -c "$filter_commit" "git commit-tree" \
8c1ce0f4	315	$(git write-tree) $parentstr < ../message > ../map/$commit
6f6826c5 JS	316	done <../revs
6f6826c5 JS	317
dfd05e38 JS	318	# In case of a subdirectory filter, it is possible that a specified head
dfd05e38 JS	319	# is not in the set of rewritten commits, because it was pruned by the
a0e46390 TR	320	# revision walker. Fix it by mapping these heads to the unique nearest
a0e46390 TR	321	# ancestor that survived the pruning.
dfd05e38	322
a0e46390 TR	323	if test "$filter_subdir"
	324	then
	325	while read ref
dfd05e38	326	do
a0e46390 TR	327	sha1=$(git rev-parse "$ref"^0)
a0e46390 TR	328	test -f "$workdir"/../map/$sha1 && continue
f34a9416 TR	329	ancestor=$(git rev-list --simplify-merges -1 \
f34a9416 TR	330	$ref -- "$filter_subdir")
a0e46390 TR	331	test "$ancestor" && echo $(map $ancestor) >> "$workdir"/../map/$sha1
	332	done < "$tempdir"/heads
	333	fi
dfd05e38 JS	334
	335	# Finally update the refs
	336
	337	_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
	338	_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
dfd05e38 JS	339	echo
	340	while read ref
	341	do
	342	# avoid rewriting a ref twice
	343	test -f "$orig_namespace$ref" && continue
	344
	345	sha1=$(git rev-parse "$ref"^0)
	346	rewritten=$(map $sha1)
	347
	348	test $sha1 = "$rewritten" &&
	349	warn "WARNING: Ref '$ref' is unchanged" &&
	350	continue
	351
	352	case "$rewritten" in
	353	'')
	354	echo "Ref '$ref' was deleted"
	355	git update-ref -m "filter-branch: delete" -d "$ref" $sha1 \|\|
	356	die "Could not delete $ref"
98409060	357	;;
dfd05e38 JS	358	$_x40)
dfd05e38 JS	359	echo "Ref '$ref' was rewritten"
261044e8 TR	360	if ! git update-ref -m "filter-branch: rewrite" \
	361	"$ref" $rewritten $sha1 2>/dev/null; then
	362	if test $(git cat-file -t "$ref") = tag; then
	363	if test -z "$filter_tag_name"; then
	364	warn "WARNING: You said to rewrite tagged commits, but not the corresponding tag."
	365	warn "WARNING: Perhaps use '--tag-name-filter cat' to rewrite the tag."
	366	fi
	367	else
	368	die "Could not rewrite $ref"
	369	fi
	370	fi
98409060	371	;;
dfd05e38 JS	372	*)
	373	# NEEDSWORK: possibly add -Werror, making this an error
	374	warn "WARNING: '$ref' was rewritten into multiple commits:"
	375	warn "$rewritten"
	376	warn "WARNING: Ref '$ref' points to the first one now."
	377	rewritten=$(echo "$rewritten" \| head -n 1)
	378	git update-ref -m "filter-branch: rewrite to first" \
	379	"$ref" $rewritten $sha1 \|\|
	380	die "Could not rewrite $ref"
	381	;;
	382	esac
	383	git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1
dfd05e38 JS	384	done < "$tempdir"/heads
	385
	386	# TODO: This should possibly go, with the semantics that all positive given
	387	# refs are updated, and their original heads stored in refs/original/
	388	# Filter tags
6f6826c5 JS	389
6f6826c5 JS	390	if [ "$filter_tag_name" ]; then
5be60078	391	git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags \|
6f6826c5 JS	392	while read sha1 type ref; do
	393	ref="${ref#refs/tags/}"
	394	# XXX: Rewrite tagged trees as well?
	395	if [ "$type" != "commit" -a "$type" != "tag" ]; then
	396	continue;
	397	fi
	398
	399	if [ "$type" = "tag" ]; then
	400	# Dereference to a commit
	401	sha1t="$sha1"
5be60078	402	sha1="$(git rev-parse "$sha1"^{commit} 2>/dev/null)" \|\| continue
6f6826c5 JS	403	fi
	404
	405	[ -f "../map/$sha1" ] \|\| continue
	406	new_sha1="$(cat "../map/$sha1")"
3addc94a JS	407	GIT_COMMIT="$sha1"
3addc94a JS	408	export GIT_COMMIT
8c1ce0f4 JS	409	new_ref="$(echo "$ref" \| eval "$filter_tag_name")" \|\|
8c1ce0f4 JS	410	die "tag name filter failed: $filter_tag_name"
6f6826c5 JS	411
	412	echo "$ref -> $new_ref ($sha1 -> $new_sha1)"
	413
	414	if [ "$type" = "tag" ]; then
a9da1663 JS	415	new_sha1=$( ( printf 'object %s\ntype commit\ntag %s\n' \
	416	"$new_sha1" "$new_ref"
	417	git cat-file tag "$ref" \|
1bf6551e BC	418	sed -n \
1bf6551e BC	419	-e "1,/^$/{
a9da1663 JS	420	/^object /d
	421	/^type /d
	422	/^tag /d
1bf6551e BC	423	}" \
1bf6551e BC	424	-e '/^-----BEGIN PGP SIGNATURE-----/q' \
a9da1663	425	-e 'p' ) \|
1bf6551e BC	426	git mktag) \|\|
	427	die "Could not create new tag object for $ref"
	428	if git cat-file tag "$ref" \| \
	429	grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
	430	then
	431	warn "gpg signature stripped from tag object $sha1t"
	432	fi
6f6826c5 JS	433	fi
6f6826c5 JS	434
af580e9c JS	435	git update-ref "refs/tags/$new_ref" "$new_sha1" \|\|
af580e9c JS	436	die "Could not write tag $new_ref"
6f6826c5 JS	437	done
	438	fi
	439
	440	cd ../..
	441	rm -rf "$tempdir"
6f6826c5	442
def16e71 BC	443	trap - 0
def16e71 BC	444
a4661b01 PB	445	if [ "$(is_bare_repository)" = false ]; then
	446	unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE
	447	test -z "$ORIG_GIT_DIR" \|\| {
	448	GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR
	449	}
	450	test -z "$ORIG_GIT_WORK_TREE" \|\| {
	451	GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" &&
	452	export GIT_WORK_TREE
	453	}
	454	test -z "$ORIG_GIT_INDEX_FILE" \|\| {
	455	GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" &&
	456	export GIT_INDEX_FILE
	457	}
	458	git read-tree -u -m HEAD
	459	fi
46eb449c	460
6f6826c5	461	exit $ret