How to invoke `occ` in docker-calcardbackup or docker in general?

[BernieO]

Hi Waja,

I still have just absolute no idea about docker and instead of investigating several hours to dig into the docker universe, which I don't use and need, I thought I'd take your time (sorry!) and ask you for your expert opinion.

Nextcloud 32.0 introduced an occ command to import ical calendar files (see here) which I want to implement in calcardbackup. Therefore I obviously need to run an occ command and I wonder what I need to do, to issue occ commands with docker-calcardbackup or docker in general.

The default path to occ in a Nextcloud installation would be ${nextcloud_path}/occ - would that work with your container?

I could also add an option to which a command can be given that will be used to invoke occ. e.g.:

./calcardbackup /path/to/nextcloud --occ-command "my special docker command occ"

This would then use the given command instead of the default and invoke my special docker command occ calender:import [...]
Is that the way to go?

I'd be very happy if you could give me your opinion.

BernieO

[waja]

Hi Bernie,

I still have just absolute no idea about docker and instead of investigating several hours to dig into the docker universe, which I don't use and need, I thought I'd take your time (sorry!) and ask you for your expert opinion.

Nextcloud 32.0 introduced an occ command to import ical calendar files (see here) which I want to implement in calcardbackup. Therefore I obviously need to run an occ command and I wonder what I need to do, to issue occ commands with docker-calcardbackup or docker in general.

I did catch that from your release notes. Unfortunately occ is not part of my image, cause it's part of nextcloud. So it's included in every nextcloud container image, but not in the image of calcardbackup.

The default path to occ in a Nextcloud installation would be ${nextcloud_path}/occ - would that work with your container?

No, cause as mentioned before, the script is not part of my image and can't be called by calcardbackup.

I could also add an option to which a command can be given that will be used to invoke occ. e.g.:

./calcardbackup /path/to/nextcloud --occ-command "my special docker command occ"

In theory this could work, but in this case the calcardbackup container needs full access to the whole docker environment on the host, which is a security threat.

Actually I can myself not imagine how it's possible to call the occ command in the nextcloud container and get calcardbackup access to the export. Maybe there is a way, which I don't have in mind. But one of the container concepts is, that you separate access on resources.
If one is building calcardbackup into his nextcloud image itself, this is indeed possible and working and would allow to use the occ export.

If there is anybody coming up with a nifty difty solution to do this with a separate image like this, this would be very welcome.

Cheers, Jan.

[BernieO]

OK, thank you. I now understand that you cannot access occ in docker-nextcloud from docker-calcardbackup.

I could also add an option to which a command can be given that will be used to invoke occ. e.g.:
./calcardbackup /path/to/nextcloud --occ-command "my special docker command occ"

In theory this could work, but in this case the calcardbackup container needs full access to the whole docker environment on the host, which is a security threat.

At the very least, this option would allow calendar files to be imported into a dockerized Nextcloud using a non-dockerized calcardbackup. Since the need to restore is certainly much less frequent than the need to back up, I think it would still be useful.

Thank you, you've helped me see things more clearly.