The plugin spec says that plugins can live in one of:
- /var/run/docker/plugins/<name>.sock
- /var/run/docker/plugins/<name>/<name>.sock
- /etc/docker/plugins/<name>.[json,spec]
- /etc/docker/plugins/<name>/<name>.<json,spec>
- /usr/lib/docker/plugins/<name>.<json,spec>
- /usr/lib/docker/plugins/<name>/<name>.<json,spec>
However, the plugin scanner which is used by the volume list API was
doing `filepath.Walk`, which will walk the entire tree for each of the
supported paths.
This means that even v2 plugins in
`/var/run/docker/plugins/<id>/<name>.sock` were being detected as a v1
plugin.
When the v1 plugin loader tried to load such a plugin it would log an
error that it couldn't find it because it doesn't match one of the
supported patterns... e.g. when in a subdir, the subdir name must match
the plugin name for the socket.
There is no behavior change as the error is only on the `Scan()` call,
which is passing names to the plugin registry when someone calls the
volume list API.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Increases the test coverage of pkg/plugins.
Changed signature of function NewClientWithTimeout in pkg/plugin/client, to
take time.Duration instead of integers.
Signed-off-by: Raja Sami <raja.sami@tenpearl.com>
When a plugin has an activation error, it was not being checked in the
`waitActive` loop. This means it will just wait forever for a manifest
to be populated even though it may never come.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
When a plugin is activated, and then `plugins.Handle` is called to
register a new handler for a given plugin type, a deadlock occurs when
for anything which calls `waitActive`, including `Get`, and `GetAll`.
This happens because `Handle()` is setting `activated` to `false` to
ensure that plugin handlers are run on next activation.
Maybe these handlers should be called immediately for any plugins which
are already registered... but to preserve the existing behavior while
fixing the deadlock, track if handlers have been run on plugins and
reset when a new handler is registered.
The simplest way to reproduce the deadlock with Docker is to add a `-v
/foo` to the test container created for the external graphdriver tests.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
