Migrating from ownCloud to a NextCloud docker container: "Updates between multiple major versions and downgrades are unsupported"

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Looking at the code I figured out that it actually uses the core.vendor config + the version config to determine whether the data is from an ownCloud instance (if core.vendor is empty, it is assumed to be owncloud). Hence what I was missing from the migration guide is that you are actually supposed to also use the config.php from your ownCloud instance in the NextCloud instance - i.e. the version in the config.php needs to reflect the version of the ownCloud instance.

Even though I was on ownCloud 10.12, I forced the update anyway by updating the version.php as shown above (conversely you could also just set the version in your config.php to 10.11). I executed

  • occ upgrade
  • occ db:convert-filecache-bigint
  • occ db:add-missing-columns
  • occ db:add-missing-indices
  • occ db:add-missing-primary-keys

and the only error that I encountered was

Updating <oauth2> ...
Repair error: token is not a valid attribute
Updated <oauth2> to 1.14.0

during occ upgrade (which I think I can ignore …).

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