cmd: create a unified cephcsi binary

Create a single binary that can start ceph-csi in either rbd
or cephfs mode.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

cmd/cephcsi.go

@@ -0,0 +1,133 @@
+/*
+Copyright 2019 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"flag"
+	"os"
+	"path"
+	"strings"
+
+	"github.com/ceph/ceph-csi/pkg/cephfs"
+	"github.com/ceph/ceph-csi/pkg/rbd"
+	"github.com/ceph/ceph-csi/pkg/util"
+	"k8s.io/klog"
+)
+
+const (
+	rbdType    = "rbd"
+	cephfsType = "cephfs"
+
+	rbdDefaultName    = "rbd.csi.ceph.com"
+	cephfsDefaultName = "cephfs.csi.ceph.com"
+)
+
+var (
+	// common flags
+	vtype           = flag.String("type", "", "driver type [rbd|cephfs]")
+	endpoint        = flag.String("endpoint", "unix://tmp/csi.sock", "CSI endpoint")
+	driverName      = flag.String("drivername", "", "name of the driver")
+	nodeID          = flag.String("nodeid", "", "node id")
+	metadataStorage = flag.String("metadatastorage", "", "metadata persistence method [node|k8s_configmap]")
+
+	// rbd related flags
+	containerized = flag.Bool("containerized", true, "whether run as containerized")
+	configRoot    = flag.String("configroot", "/etc/csi-config", "directory in which CSI specific Ceph"+
+		" cluster configurations are present, OR the value \"k8s_objects\" if present as kubernetes secrets")
+
+	// cephfs related flags
+	volumeMounter = flag.String("volumemounter", "", "default volume mounter (possible options are 'kernel', 'fuse')")
+	mountCacheDir = flag.String("mountcachedir", "", "mount info cache save dir")
+)
+
+func init() {
+	klog.InitFlags(nil)
+	if err := flag.Set("logtostderr", "true"); err != nil {
+		klog.Exitf("failed to set logtostderr flag: %v", err)
+	}
+	flag.Parse()
+}
+
+func getType() string {
+	if vtype == nil || len(*vtype) == 0 {
+		a0 := path.Base(os.Args[0])
+		if strings.Contains(a0, rbdType) {
+			return rbdType
+		}
+		if strings.Contains(a0, cephfsType) {
+			return cephfsType
+		}
+		return ""
+	}
+	return *vtype
+}
+
+func getDriverName() string {
+	// was explicitly passed a driver name
+	if driverName != nil && len(*driverName) != 0 {
+		return *driverName
+	}
+	// select driver name based on volume type
+	switch getType() {
+	case rbdType:
+		return rbdDefaultName
+	case cephfsType:
+		return cephfsDefaultName
+	default:
+		return ""
+	}
+}
+
+func main() {
+	driverType := getType()
+	if len(driverType) == 0 {
+		klog.Fatalln("driver type not specified")
+	}
+
+	dname := getDriverName()
+	err := util.ValidateDriverName(dname)
+	if err != nil {
+		klog.Fatalln(err) // calls exit
+	}
+
+	switch driverType {
+	case rbdType:
+		rbd.PluginFolder = rbd.PluginFolder + dname
+		cp, err := util.CreatePersistanceStorage(
+			rbd.PluginFolder, *metadataStorage, dname)
+		if err != nil {
+			os.Exit(1)
+		}
+		driver := rbd.NewDriver()
+		driver.Run(dname, *nodeID, *endpoint, *configRoot, *containerized, cp)
+
+	case cephfsType:
+		cephfs.PluginFolder = cephfs.PluginFolder + dname
+		cp, err := util.CreatePersistanceStorage(
+			cephfs.PluginFolder, *metadataStorage, dname)
+		if err != nil {
+			os.Exit(1)
+		}
+		driver := cephfs.NewDriver()
+		driver.Run(dname, *nodeID, *endpoint, *volumeMounter, *mountCacheDir, cp)
+
+	default:
+		klog.Fatalln("invalid volume type", vtype) // calls exit
+	}
+
+	os.Exit(0)
+}