Merge branch 'maint'

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

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 3b041d81efd7e96a49c40eba0e23fc0b18508c82..ffcc408ee5217d7a8f6179a0404ffe387e0dab0f 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -23,6 +23,20 @@ map()
        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
 
@@ -80,6 +94,10 @@ USAGE="[--env-filter <command>] [--tree-filter <command>] \
 
 . git-sh-setup
 
+git diff-files --quiet &&
+       git diff-index --cached --quiet HEAD ||
+       die "Cannot rewrite branch(es) with a dirty working directory."
+
 tempdir=.git-rewrite
 filter_env=
 filter_tree=
@@ -91,8 +109,9 @@ filter_tag_name=
 filter_subdir=
 orig_namespace=refs/original/
 force=
-while case "$#" in 0) usage;; esac
+while :
 do
+       test $# = 0 && usage
        case "$1" in
        --)
                shift
@@ -181,6 +200,9 @@ do
        esac
 done < "$tempdir"/backup-refs
 
+ORIG_GIT_DIR="$GIT_DIR"
+ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
+ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
 export GIT_DIR GIT_WORK_TREE=.
 
 # These refs should be updated if their heads were rewritten
@@ -398,4 +420,12 @@ echo
 test $count -gt 0 && echo "These refs were rewritten:"
 git show-ref | grep ^"$orig_namespace"
 
+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
+
 exit $ret