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We have been using your klayout tool in our company for many years.
Long time ago (at version 0.23) I created common place for technology data and common tuned klayoutrc file in order for everyone to have the same settings, and technology definitions. And we run it like "klayout -c $KLAYOUT_BASE_PATH/klayoutrc".
This common place was read only for all files inside for all users.
Recently I have updated klayout up to 0.27.2 version.
After running klayout in same manner (with common and read only klayoutrc file), I'm getting the following warning on exit:
"Warning: Could not create backup file: unable to rename original file '/klayoutrc' to backup file"
But amaizing issue is that klayout changes this read only klayoutrc file!
For example, it writes paths to recently used files and technology in it.
I have no root privileges! How can this happen?!