t7501: add test of "commit --dry-run --short"

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 64f21547c1ab99ef3ad98d57fe0fbadff9621838..5c5afa2b985e2e524601518bbb8fb8d3c8efda61 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -11,6 +11,8 @@
 # The following functions will also be available in the commit filter:
 
 functions=$(cat << \EOF
+EMPTY_TREE=$(git hash-object -t tree /dev/null)
+
 warn () {
        echo "$*" >&2
 }
@@ -46,7 +48,7 @@ git_commit_non_empty_tree()
 {
        if test $# = 3 && test "$1" = $(git rev-parse "$3^{tree}"); then
                map "$3"
-       elif test $# = 1 && test "$1" = 4b825dc642cb6eb9a060e54bf8d69288fbee4904; then
+       elif test $# = 1 && test "$1" = $EMPTY_TREE; then
                :
        else
                git commit-tree "$@"
@@ -370,6 +372,7 @@ while read commit parents; do
        git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1))
 
        report_progress
+       test -f "$workdir"/../map/$commit && continue
 
        case "$filter_subdir" in
        "")