AIO Backup: configuration.json not present. Cannot perform the backup!

[bennypowers]

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Nextcloud version (eg, 20.0.5): Nextcloud AIO v7.9.0
Operating system and version (eg, Ubuntu 20.04): Fedora Silverblue 39
Apache or nginx version (eg, Apache 2.4.25): Nextcloud AIO v7.9.0
PHP version (eg, 7.4): Nextcloud AIO v7.9.0

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N):

Steps to replicate it:

1. in AIO config UI, set backup dir to /var/home/powersfamily/Public/nextcloud/backups
2. Click “Create backup”
3. Backup fails

The output of your Nextcloud log in Admin > Logging: Nothing borg or backup related

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!): AIO-generated

The output of the backup container log from AIO UI:

configuration.json not present. Cannot perform the backup!
/start.sh: line 42: /nextcloud_aio_volumes/nextcloud_aio_mastercontainer/data/backup_archives.list: Permission denied
chmod: /nextcloud_aio_volumes/nextcloud_aio_mastercontainer/data/backup_archives.list: No such file or directory

I suspect this is an SELinux problem

❯ sudo ls -lZ .local/share/containers/storage/volumes/nextcloud_aio_mastercontainer/_data/data
total 12
-rwxrwx---. 1 524320 524320 unconfined_u:object_r:data_home_t:s0   48 Jan  1 18:40 backupsecret
-rwxrwx---. 1 524320 524320 unconfined_u:object_r:data_home_t:s0 1916 Jan  1 20:34 configuration.json
-rwxrwx---. 1 524320 524320 unconfined_u:object_r:data_home_t:s0   10 Jan  1 18:39 session_date_file

[bennypowers]

Indeed, everyone’s favourite mandatory access control system blocked access

sudo semanage fcontext -a -t container_file_t '/var/home/powersfamily/.local/share/containers/storage/volumes/(.*)/_data(/.*)?'