Rewrite docker-quobyte-plugin in golang

.gitignore

@@ -0,0 +1 @@
+docker-quobyte-plugin

README.md

@@ -1,43 +1,87 @@
-Quobyte volume plug-in for Docker
-=================================
+# Quobyte volume plug-in for Docker
 
-Setup:
-* create a user in Quobyte for the plug-in:
+Tested with `CentOS 7.2` and `Docker 1.10.3`. This plugin allows you to use [Quobyte](www.quobyte.com) with Docker without installing the Quobyte client on the host system (e.q. Rancher/CoreOS).
+
+## Build
+
+Get the code
+
+```
+$ go get -u github.com/quobyte/api
+$ go get -u github.com/quobyte/go-quobyte-docker
 ```
- qmgmt -u <api-url> user config add docker <email>
+
+### Linux
+
 ```
+$ go build -o docker-quobyte-plugin .
+$ cp quobyte-docker-plugin /usr/libexec/docker/docker-quobyte-plugin
+```
+
+### OSX/MacOS
 
-* set mandatory configuration in environment
 ```
-export QUOBYTE_API_USER=docker
-export QUOBYTE_API_PASSWORD=...
-export QUOBYTE_API_URL=http://<host>:7860/
+$ GOOS=linux GOARCH=amd64 go build -o docker-quobyte-plugin
+$ cp quobyte-docker-plugin /usr/libexec/docker/docker-quobyte-plugin
+```
+
+## Setup
+
+### Create a user in Quobyte for the plug-in:
+
+This step is optional.
+
+```
+$ qmgmt -u <api-url> user config add docker <email>
+```
+
+### Set mandatory configuration in environment
+
+```
+$ export QUOBYTE_API_USER=docker
+$ export QUOBYTE_API_PASSWORD=...
+$ export QUOBYTE_API_URL=http://<host>:7860/
 # host[:port][,host:port] or SRV record name
-export QUOBYTE_REGISTRY=quobyte.corp
+$ export QUOBYTE_REGISTRY=quobyte.corp
+```
+
+### Install systemd files Set the variables in systemd/docker-quobyte.env.sample
+
+```
+$ cp systemd/docker-quobyte.env.sample /etc/quobyte/docker-quobyte.env
+$ cp docker-quobyte-plugin /usr/libexec/docker/
+$ cp systemd/* /lib/systemd/system
+
+$ systemctl daemon-reload
+$ systemctl start docker-quobyte-plugin
+$ systemctl enable docker-quobyte-plugin
+$ systemctl status docker-quobyte-plugin
 ```
 
-* Start the plug-in as root (with above environment)
-``` 
-quobyte-docker-volume.py 
+## Examples
+
+### Create a volume
+
+```
+$ docker volume create --driver quobyte --name <volumename>
+# Set user and group of the volume
+$ docker volume create --driver quobyte --name <volumename> --opt user=docker --opt group=docker
 ```
 
-Examples:
+### Delete a volume
 
 ```
-# docker volume create --driver quobyte --name <volumename> --opt volume_config=MyConfig
-# docker volume create --driver quobyte --name <volumename>
-# docker volume rm <volumename>
-# docker run --volume-driver=quobyte -v <quobyte volumename>:path
+$ docker volume rm <volumename>
 ```
 
-* Install systemd files
-Set the variables in systemd/docker-quobyte.env.sample
+### List all volumes
 
 ```
-cp systemd/docker-quobyte.env.sample /etc/quobyte/docker-quobyte.env
-cp quobyte-docker-volume.py /usr/libexec/docker/
-cp systemd/* /lib/systemd/system
+$ docker volume ls
+```
+
+### Attach volume to container
 
-systemctl enable docker-quobyte-plugin
-systemctl status docker-quobyte-plugin
+```
+$ docker run --volume-driver=quobyte -v <volumename>:/vol busybox sh -c 'echo "Hello World" > /vol/hello.txt'
 ```

main.go

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+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/docker/go-plugins-helpers/volume"
+)
+
+const quobyteID string = "quobyte"
+
+// Mandatory configuration
+var qmgmtUser string
+var qmgmtPassword string
+var quobyteAPIURL string
+var quobyteRegistry string
+
+// Optional configuration
+var mountQuobytePath string
+var mountQuobyteOptions string
+
+func main() {
+	readMandatoryConfig()
+	readOptionalConfig()
+
+	if err := os.MkdirAll(mountQuobytePath, 0555); err != nil {
+		log.Println(err.Error())
+	}
+
+	if !isMounted(mountQuobytePath) {
+		log.Printf("Mounting Quobyte namespace in %s", mountQuobytePath)
+		mountAll()
+	}
+
+	qDriver := newQuobyteDriver(quobyteAPIURL, qmgmtUser, qmgmtPassword)
+	handler := volume.NewHandler(qDriver)
+	log.Println(handler.ServeUnix("root", quobyteID))
+}