tarball-incremental method doesn't apply BM_ARCHIVE_CHMOD to *.incremental.bin

[Niluge-KiWi]

With "tarball-incremental" method, it generates *.tar.gz and *.incremental.bin files. The tar.gz files are chmod'ed with BM_ARCHIVE_CHMOD if BM_REPOSITORY_SECURE is true; but not the incremental.bin ones.

By default it has -rw------- permissions, which will fail remote backup when pulling the archives to another location with a dedicated user.

Temporary fix:
Create a /home/backup/fix-perms.sh script:

#!/bin/bash
chown root:backup /home/backup/*.incremental.bin && chmod g+r /home/backup/*.incremental.bin

Then, in /etc/backup-manager.conf:

export BM_POST_BACKUP_COMMAND="/home/backup/fix-perms.sh"