Logging plugins use the same HTTP interface as other plugins for basic
command operations meanwhile actual logging operations are handled (on
Unix) via a fifo.
The plugin interface looks like so:
```go
type loggingPlugin interface {
StartLogging(fifoPath string, loggingContext Context) error
StopLogging(fifoPath)
```
This means a plugin must implement `LoggingDriver.StartLogging` and
`LoggingDriver.StopLogging` endpoints and be able to consume the passed
in fifo.
Logs are sent via stream encoder to the fifo encoded with protobuf.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
* run latest vndr so as to collect more LICENSE files
* remove unused packages
* vendor github.com/philhofer/fwd with LICENSE.md (MIT)
* vendor github.com/bsphere/le_go with LICENSE (MIT)
Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
Update swarmkit to 037b491.
As swarmkit switched to a newer gRPC version, this also involves
updating Docker's vendored gRPC, which in turn requires updating
containerd to a new version that has protobufs generated against this
gRPC version.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
