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authorMatthew Heon <matthew.heon@pm.me>2020-12-04 16:24:56 -0500
committerMatthew Heon <mheon@redhat.com>2021-01-14 15:35:33 -0500
commitb53cb57680a6fd7b383636ac2d6cd71003532915 (patch)
tree3979d1f9763326cd4db3a80742cec3a031ca99b2 /libpod/boltdb_state_internal.go
parent2b7793b6121d336a285fb7b9a7612c221cbf63d2 (diff)
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Initial implementation of volume plugins
This implements support for mounting and unmounting volumes backed by volume plugins. Support for actually retrieving plugins requires a pull request to land in containers.conf and then that to be vendored, and as such is not yet ready. Given this, this code is only compile tested. However, the code for everything past retrieving the plugin has been written - there is support for creating, removing, mounting, and unmounting volumes, which should allow full functionality once the c/common PR is merged. A major change is the signature of the MountPoint function for volumes, which now, by necessity, returns an error. Named volumes managed by a plugin do not have a mountpoint we control; instead, it is managed entirely by the plugin. As such, we need to cache the path in the DB, and calls to retrieve it now need to access the DB (and may fail as such). Notably absent is support for SELinux relabelling and chowning these volumes. Given that we don't manage the mountpoint for these volumes, I am extremely reluctant to try and modify it - we could easily break the plugin trying to chown or relabel it. Also, we had no less than *5* separate implementations of inspecting a volume floating around in pkg/infra/abi and pkg/api/handlers/libpod. And none of them used volume.Inspect(), the only correct way of inspecting volumes. Remove them all and consolidate to using the correct way. Compat API is likely still doing things the wrong way, but that is an issue for another day. Fixes #4304 Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Diffstat (limited to 'libpod/boltdb_state_internal.go')
-rw-r--r--libpod/boltdb_state_internal.go15
1 files changed, 15 insertions, 0 deletions
diff --git a/libpod/boltdb_state_internal.go b/libpod/boltdb_state_internal.go
index c06fedd3e..6014fbef3 100644
--- a/libpod/boltdb_state_internal.go
+++ b/libpod/boltdb_state_internal.go
@@ -497,6 +497,21 @@ func (s *BoltState) getVolumeFromDB(name []byte, volume *Volume, volBkt *bolt.Bu
}
}
+ // Retrieve volume driver
+ if volume.UsesVolumeDriver() {
+ plugin, err := s.runtime.getVolumePlugin(volume.config.Driver)
+ if err != nil {
+ // We want to fail gracefully here, to ensure that we
+ // can still remove volumes even if their plugin is
+ // missing. Otherwise, we end up with volumes that
+ // cannot even be retrieved from the database and will
+ // cause things like `volume ls` to fail.
+ logrus.Errorf("Volume %s uses volume plugin %s, but it cannot be accessed - some functionality may not be available: %v", volume.Name(), volume.config.Driver, err)
+ } else {
+ volume.plugin = plugin
+ }
+ }
+
// Get the lock
lock, err := s.runtime.lockManager.RetrieveLock(volume.config.LockID)
if err != nil {