mergetools / opendiffon commit rev-list: disable object/refname ambiguity check with --stdin (4c30d50)
   1diff_cmd () {
   2        "$merge_tool_path" "$LOCAL" "$REMOTE" | cat
   3}
   4
   5merge_cmd () {
   6        touch "$BACKUP"
   7        if $base_present
   8        then
   9                "$merge_tool_path" "$LOCAL" "$REMOTE" \
  10                        -ancestor "$BASE" -merge "$MERGED" | cat
  11        else
  12                "$merge_tool_path" "$LOCAL" "$REMOTE" \
  13                        -merge "$MERGED" | cat
  14        fi
  15        check_unchanged
  16}