moved cephfs mounting logic to volumemounter

pkg/cephfs/volumemounter.go

@@ -0,0 +1,137 @@
+/*
+Copyright 2018 The Kubernetes 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 cephfs
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+)
+
+const (
+	volumeMounter_fuse   = "fuse"
+	volumeMounter_kernel = "kernel"
+)
+
+type volumeMounter interface {
+	mount(mountPoint string, cr *credentials, volOptions *volumeOptions, volUuid string, readOnly bool) error
+}
+
+type fuseMounter struct{}
+
+func mountFuse(mountPoint string, cr *credentials, volOptions *volumeOptions) error {
+	args := [...]string{
+		mountPoint,
+		"-n", cephEntityClientPrefix + cr.id,
+		"-r", volOptions.RootPath,
+	}
+
+	out, err := execCommand("ceph-fuse", args[:]...)
+	if err != nil {
+		return fmt.Errorf("cephfs: ceph-fuse failed with following error: %s\ncephfs: ceph-fuse output: %s", err, out)
+	}
+
+	if !bytes.Contains(out, []byte("starting fuse"[:])) {
+		return fmt.Errorf("cephfs: ceph-fuse failed:\ncephfs: ceph-fuse output: %s", out)
+	}
+
+	return nil
+}
+
+func (m *fuseMounter) mount(mountPoint string, cr *credentials, volOptions *volumeOptions, volUuid string, readOnly bool) error {
+	if err := createMountPoint(mountPoint); err != nil {
+		return err
+	}
+
+	localVolRoot := getVolumeRootPath_local(volUuid)
+
+	if err := createMountPoint(localVolRoot); err != nil {
+		return err
+	}
+
+	if err := mountFuse(localVolRoot, cr, volOptions); err != nil {
+		return err
+	}
+
+	return bindVolume(volUuid, mountPoint, readOnly)
+}
+
+type kernelMounter struct{}
+
+func mountKernel(mountPoint string, cr *credentials, volOptions *volumeOptions) error {
+	if err := execCommandAndValidate("modprobe", "ceph"); err != nil {
+		return err
+	}
+
+	return execCommandAndValidate("mount",
+		"-t", "ceph",
+		fmt.Sprintf("%s:%s", volOptions.Monitors, volOptions.RootPath),
+		mountPoint,
+		"-o",
+		fmt.Sprintf("name=%s,secretfile=%s", cr.id, getCephSecretPath(cr.id)),
+	)
+}
+
+func (m *kernelMounter) mount(mountPoint string, cr *credentials, volOptions *volumeOptions, volUuid string, readOnly bool) error {
+	if err := createMountPoint(mountPoint); err != nil {
+		return err
+	}
+
+	localVolRoot := getVolumeRootPath_local(volUuid)
+
+	if err := createMountPoint(localVolRoot); err != nil {
+		return err
+	}
+
+	if err := mountKernel(localVolRoot, cr, volOptions); err != nil {
+		return err
+	}
+
+	return bindVolume(volUuid, mountPoint, readOnly)
+}
+
+func bindMount(from, to string, readOnly bool) error {
+	if err := execCommandAndValidate("mount", "--bind", from, to); err != nil {
+		return fmt.Errorf("failed bind-mount of %s to %s: %v", from, to, err)
+	}
+
+	if readOnly {
+		if err := execCommandAndValidate("mount", "-o", "remount,ro,bind", to); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func bindVolume(volUuid, target string, readOnly bool) error {
+	volDataRoot := getVolumeDataPath_local(volUuid)
+
+	if err := createMountPoint(volDataRoot); err != nil {
+		return err
+	}
+
+	return bindMount(volDataRoot, target, readOnly)
+}
+
+func unmountVolume(mountPoint string) error {
+	return execCommandAndValidate("umount", mountPoint)
+}
+
+func createMountPoint(root string) error {
+	return os.MkdirAll(root, 0750)
+}