Directories under cpool are create with world-writable permissions

[juergen-harms]

BackupPC-4 creates directories under cpool with world-writable permission (no problem in BackupPC-3).

• even if these directories are below a top-level directory that is protected against traversal without proper permissions, this is bad security;
• on platforms which check against world-writable files / directories, this results in security summaries with long lists of warnings;
• such directories permanently pollute the backup storage of a site.

The creation of these directories has been traced to the backuppc/bpc_dirOps .c procedure of rsync-bpc (the configuration variable $Conf{UmaskMode} does not have any influence on the permission of the created directories).

This issue has relative urgency since the Mageia distro is finalising its new Mageia-7 release and would like to include BackupPC 4.3.0 in this release - see https://bugs.mageia.org/show_bug.cgi?id=24441

Sorry for the typo in the titile: create -> created

[juergen-harms]

Triggered by drafting this post, we realized that Mageia had not packaged the most recent version of rsync-bpc in support of BackupPC. This has now been corrected: with rsync-bpc-3.1.2.0 the problem has gone away, directories created by BackupPC now have the permission they are expected to have.

Apologies for the noise!