Refactor decomposedfs to be more extensible, e.g. for the posix driver

[aduffeck]

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[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[butonic]

I see where you are deleting the metadata lock ... is that conflicting with the old xattr backend? I fear that would delete the actual metadata file. 🤔 👀

no ... the xattr backend also has a dedicated file for metadata locks

[butonic]

when deleting my storage users I don't seem to be able to get a personal space:

2024-04-22T15:18:49+02:00 ERR error when calling Createhome error="gateway: grpc failed with code CODE_INTERNAL" line=/home/jfd/Repositories/ocis/services/proxy/pkg/middleware/create_home.go:78 service=proxy
2024-04-22T15:18:49+02:00 ERR failed to list storage spaces error="error reading user index: stat /home/jfd/.ocis/storage/users/indexes/by-user-id/534bb038-6f9d-4093-946f-133be61fa4e7.mpk: no such file or directory" filters=[{"Term":{"SpaceType":"project"},"type":4},{"Term":{"User":{"idp":"https://cloud.ocis.test","opaque_id":"534bb038-6f9d-4093-946f-133be61fa4e7"}},"type":6}] line=/home/jfd/Repositories/reva/internal/grpc/services/storageprovider/storageprovider.go:575 pkg=rgrpc service=storage-users status={"code":15,"message":"error listing spaces","trace":"b32ff7051e1b71f97dd10c798b02d094"} traceid=b32ff7051e1b71f97dd10c798b02d094

[aduffeck]

@butonic Ah, ocis is still configuring the UserLayout variable for decomposedfs based fses, so reusing that variable for the posixfs use case was a bad idea.
I now introduced PersonalSpacePathTemplate and GeneralSpacePathTemplate instead, the ocis part (which isn't required for now since for ocis/s3ng it just default to "" as required anyway)) is part of owncloud/ocis#8598

[butonic]

ok, this works for me as well. But lets make sure the ocis CI does not choke: owncloud/ocis#8935

[butonic]

I hope this is just flaky, rerunning ci

[aduffeck]

@butonic the merge is green at owncloud/ocis#9038 now. Good to go?

[butonic]

@aduffeck do you bump reva in ocis?

[aduffeck]

Sure thing: owncloud/ocis#9050