X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=git-filter-branch.sh;h=a2fcebc1c63082db03445b65e340286d0c129903;hb=792d2370f975f032a708cb35044193b5b5310840;hp=2929925a0e4c29c89ea37793e51611cedc267145;hpb=c12764b8b7e004f84b1e685b76f2d662bee8e196;p=git.git

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
old mode 100755
new mode 100644
index 2929925a0..a2fcebc1c
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -42,15 +42,6 @@
 #	does this in the '.git-rewrite/' directory but you can override
 #	that choice by this parameter.
 #
-# -r STARTREV:: The commit id to start the rewrite at
-#	Normally, the command will rewrite the entire history. If you
-#	pass this argument, though, this will be the first commit it
-#	will rewrite and keep the previous commits intact.
-#
-# -k KEEPREV:: A commit id until which _not_ to rewrite history
-#	If you pass this argument, this commit and all of its
-#	predecessors are kept intact.
-#
 # Filters
 # ~~~~~~~
 # The filters are applied in the order as listed below. The COMMAND
@@ -128,6 +119,10 @@
 #	attached, the rewritten tag won't have it. Sorry. (It is by
 #	definition impossible to preserve signatures at any rate, though.)
 #
+# --subdirectory-filter DIRECTORY:: Only regard the history, as seen by
+#	the given subdirectory. The result will contain that directory as
+#	its project root.
+#
 # EXAMPLE USAGE
 # -------------
 # Suppose you want to remove a file (containing confidential information
@@ -164,32 +159,45 @@
 # and all children of the merge will become merge commits with P1,P2
 # as their parents instead of the merge commit.
 #
-# To restrict rewriting to only part of the history, use -r or -k or both.
+# To restrict rewriting to only part of the history, specify a revision
+# range in addition to the new branch name. The new branch name will
+# point to the top-most revision that a 'git rev-list' of this range
+# will print.
+#
 # Consider this history:
 #
 #	     D--E--F--G--H
 #	    /     /
 #	A--B-----C
 #
-# To rewrite only commits F,G,H, use:
+# To rewrite commits D,E,F,G,H, use:
 #
-#	git-filter-branch -r F ...
+#	git-filter-branch ... new-H C..H
 #
 # To rewrite commits E,F,G,H, use one of these:
 #
-#	git-filter-branch -r E -k C ...
-#	git-filter-branch -k D -k C ...
+#	git-filter-branch ... new-H C..H --not D
+#	git-filter-branch ... new-H D..H --not C
+#
+# To move the whole tree into a subdirectory, or remove it from there:
+#
+# git-filter-branch --index-filter \
+#	'git-ls-files -s | sed "s-\t-&newsubdir/-" |
+#		GIT_INDEX_FILE=$GIT_INDEX_FILE.new \
+#			git-update-index --index-info &&
+#	 mv $GIT_INDEX_FILE.new $GIT_INDEX_FILE' directorymoved
 
 # Testsuite: TODO
 
 set -e
 
-USAGE="git-filter-branch [-d TEMPDIR] [-r STARTREV]... [-k KEEPREV]... [-s SRCBRANCH] [FILTERS] DESTBRANCH"
+USAGE="git-filter-branch [-d TEMPDIR] [FILTERS] DESTBRANCH [REV-RANGE]"
 . git-sh-setup
 
 map()
 {
-	[ -r "$workdir/../map/$1" ] || return 1
+	# if it was not rewritten, take the original
+	test -r "$workdir/../map/$1" || echo "$1"
 	cat "$workdir/../map/$1"
 }
 
@@ -226,13 +234,7 @@ set_ident () {
 	echo "[ -n \"\$GIT_${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\""
 }
 
-# list all parent's object names for a given commit
-get_parents () {
-	git-rev-list -1 --parents "$1" | sed "s/^[0-9a-f]*//"
-}
-
 tempdir=.git-rewrite
-unchanged=" "
 filter_env=
 filter_tree=
 filter_index=
@@ -240,7 +242,7 @@ filter_parent=
 filter_msg=cat
 filter_commit='git-commit-tree "$@"'
 filter_tag_name=
-srcbranch=HEAD
+filter_subdir=
 while case "$#" in 0) usage;; esac
 do
 	case "$1" in
@@ -265,12 +267,6 @@ do
 	-d)
 		tempdir="$OPTARG"
 		;;
-	-r)
-		unchanged="$(get_parents "$OPTARG") $unchanged"
-		;;
-	-k)
-		unchanged="$(git-rev-parse "$OPTARG"^{commit}) $unchanged"
-		;;
 	--env-filter)
 		filter_env="$OPTARG"
 		;;
@@ -292,8 +288,8 @@ do
 	--tag-name-filter)
 		filter_tag_name="$OPTARG"
 		;;
-	-s)
-		srcbranch="$OPTARG"
+	--subdirectory-filter)
+		filter_subdir="$OPTARG"
 		;;
 	*)
 		usage
@@ -302,6 +298,7 @@ do
 done
 
 dstbranch="$1"
+shift
 test -n "$dstbranch" || die "missing branch name"
 git-show-ref "refs/heads/$dstbranch" 2> /dev/null &&
 	die "branch $dstbranch already exists"
@@ -315,9 +312,10 @@ case "$GIT_DIR" in
 /*)
 	;;
 *)
-	export GIT_DIR="$(pwd)/../../$GIT_DIR"
+	GIT_DIR="$(pwd)/../../$GIT_DIR"
 	;;
 esac
+export GIT_DIR GIT_WORK_TREE=.
 
 export GIT_INDEX_FILE="$(pwd)/../index"
 git-read-tree # seed the index file
@@ -327,22 +325,31 @@ ret=0
 
 mkdir ../map # map old->new commit ids for rewriting parents
 
-# seed with identity mappings for the parents where we start off
-for commit in $unchanged; do
-	echo $commit > ../map/$commit
-done
-
-git-rev-list --reverse --topo-order $srcbranch --not $unchanged >../revs
+case "$filter_subdir" in
+"")
+	git-rev-list --reverse --topo-order --default HEAD \
+		--parents "$@"
+	;;
+*)
+	git-rev-list --reverse --topo-order --default HEAD \
+		--parents --full-history "$@" -- "$filter_subdir"
+esac > ../revs
 commits=$(cat ../revs | wc -l | tr -d " ")
 
 test $commits -eq 0 && die "Found nothing to rewrite"
 
 i=0
-while read commit; do
+while read commit parents; do
 	i=$(($i+1))
 	printf "$commit ($i/$commits) "
 
-	git-read-tree -i -m $commit
+	case "$filter_subdir" in
+	"")
+		git-read-tree -i -m $commit
+		;;
+	*)
+		git-read-tree -i -m $commit:"$filter_subdir"
+	esac
 
 	export GIT_COMMIT=$commit
 	git-cat-file commit "$commit" >../commit
@@ -366,14 +373,10 @@ while read commit; do
 	eval "$filter_index" < /dev/null
 
 	parentstr=
-	for parent in $(get_parents $commit); do
-		if [ -r "../map/$parent" ]; then
-			for reparent in $(cat "../map/$parent"); do
-				parentstr="$parentstr -p $reparent"
-			done
-		else
-			die "assertion failed: parent $parent for commit $commit not found in rewritten ones"
-		fi
+	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 "$filter_parent")"
@@ -385,12 +388,21 @@ while read commit; do
 		tee ../map/$commit
 done <../revs
 
-git-update-ref refs/heads/"$dstbranch" $(head -n 1 ../map/$(tail -n 1 ../revs))
-if [ "$(cat ../map/$(tail -n 1 ../revs) | wc -l)" -gt 1 ]; then
-	echo "WARNING: Your commit filter caused the head commit to expand to several rewritten commits. Only the first such commit was recorded as the current $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2
-	sed 's/^/	/' ../map/$(tail -n 1 ../revs) >&2
-	ret=1
-fi
+src_head=$(tail -n 1 ../revs | sed -e 's/ .*//')
+target_head=$(head -n 1 ../map/$src_head)
+case "$target_head" in
+'')
+	echo Nothing rewritten
+	;;
+*)
+	git-update-ref refs/heads/"$dstbranch" $target_head
+	if [ $(cat ../map/$src_head | wc -l) -gt 1 ]; then
+		echo "WARNING: Your commit filter caused the head commit to expand to several rewritten commits. Only the first such commit was recorded as the current $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2
+		sed 's/^/	/' ../map/$src_head >&2
+		ret=1
+	fi
+	;;
+esac
 
 if [ "$filter_tag_name" ]; then
 	git-for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags |