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-rwxr-xr-xgit-filter-branch.sh42
1 files changed, 29 insertions, 13 deletions
diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 8ef1bde..3dfb2c3 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -125,6 +125,7 @@ filter_subdir=
orig_namespace=refs/original/
force=
prune_empty=
+remap_to_ancestor=
while :
do
case "$1" in
@@ -137,6 +138,11 @@ do
force=t
continue
;;
+ --remap-to-ancestor)
+ shift
+ remap_to_ancestor=t
+ continue
+ ;;
--prune-empty)
shift
prune_empty=t
@@ -182,6 +188,7 @@ do
;;
--subdirectory-filter)
filter_subdir="$OPTARG"
+ remap_to_ancestor=t
;;
--original)
orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/
@@ -200,7 +207,7 @@ t,)
,*)
;;
*)
- die "Cannot set --prune-empty and --filter-commit at the same time"
+ die "Cannot set --prune-empty and --commit-filter at the same time"
esac
case "$force" in
@@ -257,15 +264,24 @@ git read-tree || die "Could not seed the index"
# map old->new commit ids for rewriting parents
mkdir ../map || die "Could not create map/ directory"
+# we need "--" only if there are no path arguments in $@
+nonrevs=$(git rev-parse --no-revs "$@") || exit
+test -z "$nonrevs" && dashdash=-- || dashdash=
+rev_args=$(git rev-parse --revs-only "$@")
+
case "$filter_subdir" in
"")
- git rev-list --reverse --topo-order --default HEAD \
- --parents --simplify-merges "$@"
+ eval set -- "$(git rev-parse --sq --no-revs "$@")"
;;
*)
- git rev-list --reverse --topo-order --default HEAD \
- --parents --simplify-merges "$@" -- "$filter_subdir"
-esac > ../revs || die "Could not get the commits"
+ eval set -- "$(git rev-parse --sq --no-revs "$@" $dashdash \
+ "$filter_subdir")"
+ ;;
+esac
+
+git rev-list --reverse --topo-order --default HEAD \
+ --parents --simplify-merges $rev_args "$@" > ../revs ||
+ die "Could not get the commits"
commits=$(wc -l <../revs | tr -d " ")
test $commits -eq 0 && die "Found nothing to rewrite"
@@ -345,19 +361,19 @@ while read commit parents; do
die "could not write rewritten commit"
done <../revs
-# In case of a subdirectory filter, it is possible that a specified head
-# is not in the set of rewritten commits, because it was pruned by the
-# revision walker. Fix it by mapping these heads to the unique nearest
-# ancestor that survived the pruning.
+# If we are filtering for paths, as in the case of a subdirectory
+# filter, it is possible that a specified head is not in the set of
+# rewritten commits, because it was pruned by the revision walker.
+# Ancestor remapping fixes this by mapping these heads to the unique
+# nearest ancestor that survived the pruning.
-if test "$filter_subdir"
+if test "$remap_to_ancestor" = t
then
while read ref
do
sha1=$(git rev-parse "$ref"^0)
test -f "$workdir"/../map/$sha1 && continue
- ancestor=$(git rev-list --simplify-merges -1 \
- $ref -- "$filter_subdir")
+ ancestor=$(git rev-list --simplify-merges -1 "$ref" "$@")
test "$ancestor" && echo $(map $ancestor) >> "$workdir"/../map/$sha1
done < "$tempdir"/heads
fi