mergetools / opendiffon commit print errno when reporting a system call error (5118d7f)
   1diff_cmd () {
   2        "$merge_tool_path" "$LOCAL" "$REMOTE" | cat
   3}
   4
   5merge_cmd () {
   6        if $base_present
   7        then
   8                "$merge_tool_path" "$LOCAL" "$REMOTE" \
   9                        -ancestor "$BASE" -merge "$MERGED" | cat
  10        else
  11                "$merge_tool_path" "$LOCAL" "$REMOTE" \
  12                        -merge "$MERGED" | cat
  13        fi
  14}