This patch introduces a new experimental engine-level plugin management
with a new API and command line. Plugins can be distributed via a Docker
registry, and their lifecycle is managed by the engine.
This makes plugins a first-class construct.
For more background, have a look at issue #20363.
Documentation is in a separate commit. If you want to understand how the
new plugin system works, you can start by reading the documentation.
Note: backwards compatibility with existing plugins is maintained,
albeit they won't benefit from the advantages of the new system.
Signed-off-by: Tibor Vass <tibor@docker.com>
Signed-off-by: Anusha Ragunathan <anusha@docker.com>
Makes `docker volume ls` and `docker volume inspect` ask the volume
drivers rather than only using what is cached locally.
Previously in order to use a volume from an external driver, one would
either have to use `docker volume create` or have a container that is
already using that volume for it to be visible to the other volume
API's.
For keeping uniqueness of volume names in the daemon, names are bound to
a driver on a first come first serve basis. If two drivers have a volume
with the same name, the first one is chosen, and a warning is logged
about the second one.
Adds 2 new methods to the plugin API, `List` and `Get`.
If a plugin does not implement these endpoints, a user will not be able
to find the specified volumes as well requests go through the drivers.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This patches avoids registering (and calling) the same plugin more than
once. Using an helper map which indexes by name guarantees this and keeps
the order.
The behavior of overriding the same name in a flag is consistent with,
for instance, the `docker run -v /test -v /test` flag which register
the volume just once.
Adds integration tests.
Without this patch:
```
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.080901676+01:00" level=debug msg="Calling
GET
/v1.22/info"
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.081213202+01:00" level=debug msg="AuthZ
request using plugin docker-novolume-plugin"
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.081268132+01:00" level=debug
msg="docker-novolume-plugin implements: authz"
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.081699788+01:00" level=debug msg="AuthZ
request using plugin docker-novolume-plugin"
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.081762507+01:00" level=debug
msg="docker-novolume-plugin implements: authz"
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.082092480+01:00" level=debug msg="GET
/v1.22/info"
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.628691038+01:00" level=debug msg="AuthZ
response using plugin docker-novolume-plugin"
Dec 20 19:34:52 localhost.localdomain docker[9988]:
time="2015-12-20T19:34:52.629880930+01:00" level=debug msg="AuthZ
response using plugin docker-novolume-plugin"
```
With this patch:
```
Dec 20 19:37:32 localhost.localdomain docker[16620]:
time="2015-12-20T19:37:32.376523958+01:00" level=debug msg="Calling
GET
/v1.22/info"
Dec 20 19:37:32 localhost.localdomain docker[16620]:
time="2015-12-20T19:37:32.376715483+01:00" level=debug msg="AuthZ
request using plugin docker-novolume-plugin"
Dec 20 19:37:32 localhost.localdomain docker[16620]:
time="2015-12-20T19:37:32.376771230+01:00" level=debug
msg="docker-novolume-plugin implements: authz"
Dec 20 19:37:32 localhost.localdomain docker[16620]:
time="2015-12-20T19:37:32.377698897+01:00" level=debug msg="GET
/v1.22/info"
Dec 20 19:37:32 localhost.localdomain docker[16620]:
time="2015-12-20T19:37:32.951016441+01:00" level=debug msg="AuthZ
response using plugin docker-novolume-plugin"
```
Also removes a somehow duplicate debug statement (leaving only the
second one as it's a loop of plugin's manifest):
```
Dec 20 19:52:30 localhost.localdomain docker[25767]:
time="2015-12-20T19:52:30.544090518+01:00" level=debug
msg="docker-novolume-plugin's manifest: &{[authz]}"
Dec 20 19:52:30 localhost.localdomain docker[25767]:
time="2015-12-20T19:52:30.544170677+01:00" level=debug
msg="docker-novolume-plugin implements: authz"
```
Signed-off-by: Antonio Murdaca <runcom@redhat.com>
Check if there is a plugin socket first under `/run/docker/plugins/NAME.sock`.
If there is no socket for a plugin, check `/etc/docker/plugins/NAME.spec` and
`/usr/lib/docker/plugins/NAME.spec` for spec files.
Signed-off-by: David Calavera <david.calavera@gmail.com>
