push: fix segfault for odd config

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 27b57b826a26d80551169b355a5e8fc1a35de994..20f6f5175070f62ab74eda4839c637afe1004d49 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -220,13 +220,21 @@ die ""
 # Remove tempdir on exit
 trap 'cd ../..; rm -rf "$tempdir"' 0
 
+ORIG_GIT_DIR="$GIT_DIR"
+ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
+ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
+GIT_WORK_TREE=.
+export GIT_DIR GIT_WORK_TREE
+
 # Make sure refs/original is empty
 git for-each-ref > "$tempdir"/backup-refs || exit
 while read sha1 type name
 do
        case "$force,$name" in
        ,$orig_namespace*)
-               die "Namespace $orig_namespace not empty"
+               die "Cannot create a new backup.
+A previous backup already exists in $orig_namespace
+Force overwriting the backup with -f"
        ;;
        t,$orig_namespace*)
                git update-ref -d "$name" $sha1
@@ -234,12 +242,6 @@ do
        esac
 done < "$tempdir"/backup-refs
 
-ORIG_GIT_DIR="$GIT_DIR"
-ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
-ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
-GIT_WORK_TREE=.
-export GIT_DIR GIT_WORK_TREE
-
 # The refs should be updated if their heads were rewritten
 git rev-parse --no-flags --revs-only --symbolic-full-name \
        --default HEAD "$@" > "$tempdir"/raw-heads || exit