Nextcloud

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Upgrade

As you can see on the package search, there is no default nextcloud package. Instead you have to set the current version in services.nextcloud.package, and it is your job as the maintainer of your nextcloud to check whether you're running an upstream supported version.

Upgrading then consists of these steps:

nextcloud-occ maintenance:mode --on
Increment the version of services.nextcloud.package in your config by 1 (leaving out a major version is not supported)
nixos-rebuild switch
nextcloud-occ maintenance:mode --off

In theory, your nextcloud has now been upgraded by one version. NixOS attempts nextcloud-occ upgrade, if this succeeds without problems you don't need to do anything. Check journalctl to make sure nothing horrible happened. Go to the /settings/admin/overview page in your nextcloud to see whether it recommends further processing, such as database reindexing or conversion.

Troubleshooting

You get the message

   U Wed Jul  3 06:15:06 2019 p3 nextcloud-cron.service Nextcloud[9374]: {cron} {"Exception":"Exception","Message":"Not installed","Code":0,"Trace":[{"file":"\/nix\/store\/9c58nxa9mzzg93ppwq2jlynpf4vsbd30-nextcloud-15.0.8\/lib\/base.php","line":660,"function":"checkInstalled","class":"OC","type":"::","args":[]},{"file":"\/nix\/store\/9c58nxa9mzzg93ppwq2jlynpf4vsbd30-nextcloud-15.0.8\/lib\/base.php","line":1068,"function":"init","class":"OC","type":"::","args":[]},{"file":"\/nix\/store\/9c58nxa9mzzg93ppwq2jlynpf4vsbd30-nextcloud-15.0.8\/cron.php","line":41,"args":["\/nix\/store\/9c58nxa9mzzg93ppwq2jlynpf4vsbd30-nextcloud-15.0.8\/lib\/base.php"],"function":"require_once"}],"File":"\/nix\/store\/9c58nxa9mzzg93ppwq2jlynpf4vsbd30-nextcloud-15.0.8\/lib\/base.php","Line":277,"CustomMessage":"--"}

Then you run into [1]