Merge branch 'js/filter-branch-prime'

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index ed3db7d6e5785cfb2ea0fa504bca0d00541ce058..195b5ef48ed3371b2010f9caf711e12089da9c06 100755 (executable)
--- 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/" : '\(.*[^/]\)/*$')/
@@ -252,7 +259,6 @@ test -s "$tempdir"/heads ||
 
 GIT_INDEX_FILE="$(pwd)/../index"
 export GIT_INDEX_FILE
-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"
@@ -354,12 +360,13 @@ 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
@@ -465,7 +472,7 @@ if [ "$filter_tag_name" ]; then
                                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
+                          sane_grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1
                        then
                                warn "gpg signature stripped from tag object $sha1t"
                        fi