feat(zfs-localpv): initial commit

provisioning and deprovisioning of
the volumes on the node where zfs pool
has already been setup. Pool name and the volume
parameters has to be given in storage class
which will be used to provision the volume.

Signed-off-by: Pawan <pawan@mayadata.io>

cmd/main.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/Sirupsen/logrus"
+	config "github.com/openebs/zfs-localpv/pkg/config"
+	"github.com/openebs/zfs-localpv/pkg/driver"
+	"github.com/openebs/zfs-localpv/pkg/version"
+	zvol "github.com/openebs/zfs-localpv/pkg/zfs"
+	"github.com/spf13/cobra"
+)
+
+/*
+ * main routine to start the zfs-driver. The same
+ * binary is used to controller and agent deployment.
+ * they both are differentiated via plugin command line
+ * argument. To start the controller, we have to pass
+ * --plugin=controller and to start it as agent, we have
+ * to pass --plugin=agent.
+ */
+func main() {
+	_ = flag.CommandLine.Parse([]string{})
+	var config = config.Default()
+
+	cmd := &cobra.Command{
+		Use:   "zfs-driver",
+		Short: "driver for provisioning zfs volume",
+		Long: `provisions and deprovisions the volume
+		    on the node which has zfs pool configured.`,
+		Run: func(cmd *cobra.Command, args []string) {
+			run(config)
+		},
+	}
+
+	cmd.Flags().AddGoFlagSet(flag.CommandLine)
+
+	cmd.PersistentFlags().StringVar(
+		&config.NodeID, "nodeid", zvol.NodeID, "NodeID to identify the node running this driver",
+	)
+
+	cmd.PersistentFlags().StringVar(
+		&config.Version, "version", "", "Displays driver version",
+	)
+
+	cmd.PersistentFlags().StringVar(
+		&config.Endpoint, "endpoint", "unix://csi/csi.sock", "CSI endpoint",
+	)
+
+	cmd.PersistentFlags().StringVar(
+		&config.DriverName, "name", "zfs-localpv", "Name of this driver",
+	)
+
+	cmd.PersistentFlags().StringVar(
+		&config.PluginType, "plugin", "csi-plugin", "Type of this driver i.e. controller or node",
+	)
+
+	err := cmd.Execute()
+	if err != nil {
+		_, _ = fmt.Fprintf(os.Stderr, "%s", err.Error())
+		os.Exit(1)
+	}
+}
+
+func run(config *config.Config) {
+	if config.Version == "" {
+		config.Version = version.Current()
+	}
+
+	logrus.Infof("%s - %s", version.Current(), version.GetGitCommit())
+	logrus.Infof(
+		"DriverName: %s Plugin: %s EndPoint: %s NodeID: %s",
+		config.DriverName,
+		config.PluginType,
+		config.Endpoint,
+		config.NodeID,
+	)
+
+	err := driver.New(config).Run()
+	if err != nil {
+		log.Fatalln(err)
+	}
+	os.Exit(0)
+}