Docker may re-send Create requests for volumes that already exist,
especially after a plugin restart. Previously this returned
ErrVolumeExists which Docker surfaced as "volume name must be unique".
Now if a volume with the same name already exists, Create returns
success (no-op), matching the Docker volume plugin protocol's
expectation of idempotent operations.
When restoring multiple volumes from saved state, each volume's
filesystem setup (including connecting to the remote) was done
sequentially. Now volumes are restored concurrently, so a single
slow or unreachable remote doesn't delay the restoration of other
volumes.
When restoring volumes from saved state during plugin startup, a slow
or unreachable remote could block indefinitely in fs.NewFs. Add a
30-second per-volume timeout context so that individual volume failures
are logged and skipped rather than blocking the entire plugin.
Previously, restoreState in NewDriver would restore volumes AND perform
FUSE mounts synchronously before the Docker plugin socket was created.
This caused two problems:
1. The monChan was created after restoreState, but mount() sends on
monChan, causing a deadlock (send on nil channel blocks forever).
2. Even with the channel fix, slow or hanging mounts during state
restore would block the server socket from being created, causing
Docker to time out after ~13 seconds with "no such file or
directory" for the plugin socket.
Fix by:
- Moving monChan creation and monitor goroutine start before
restoreState
- Splitting state restore into two phases: restoreState (metadata +
filesystem setup only) and RestoreMounts (actual FUSE mounts)
- Calling RestoreMounts asynchronously after the server starts
listening
- Performing mount restoration concurrently across volumes
Fixes#9231
Before, rclone serve would crash when sent a SIGHUP which contradicts
the documentation - saying it should flush the directory caches.
Moved signal handling from the mount into the vfs layer, which now
handles SIGHUP on all uses of the VFS including mount and serve.
Fixes#8607
This also
- move in use options (Opt) from vfsflags to vfscommon
- change os.FileMode to vfscommon.FileMode in parameters
- rework vfscommon.FileMode and add tests
This is possible now that we no longer support go1.12 and brings
rclone into line with standard practices in the Go world.
This also removes errors.New and errors.Errorf from lib/errors and
prefers the stdlib errors package over lib/errors.
This replaces built-in os.MkdirAll with a patched version that stops the recursion
when reaching the volume part of the path. The original version would continue recursion,
and for extended length paths end up with \\? as the top-level directory, and the error
message would then be something like:
mkdir \\?: The filename, directory name, or volume label syntax is incorrect.
Nick Craig-Wood
Oleksandr RedkoandGitHub
dougalandNick Craig-Wood
Anagh Kumar BaranwalandNick Craig-Wood
albertonyandNick Craig-Wood
Ivan Andreev
Antoine GIRARDandIvan Andreev