close metafile to prevent box_inside writing false data to it - see https://github.com/ronalchn/isolate-cheater
drop root privileges, use real user id to open metafile - security issue - can be used for privilege escalation attacks for users permitted to execute isolate
Merge branch 'isolate.close.metafile' into isolate.open.metafile.permissions
Merge remote branch 'origin/isolate.open.metafile.permissions' into nztrain