Dont exit if 'mount.glusterfs -V' resulted in an error.

pkg/volume/glusterfs/glusterfs.go

@@ -379,6 +379,7 @@ func (b *glusterfsMounter) setUpAtInternal(dir string) error {
 
 	}
 	options = append(options, "backup-volfile-servers="+dstrings.Join(addrlist[:], ":"))
+	mountOptions := volume.JoinMountOptions(b.mountOptions, options)
 
 	//fetch client version.
 	mountBinaryVerStr := ""
@@ -386,8 +387,8 @@ func (b *glusterfsMounter) setUpAtInternal(dir string) error {
 
 	cmdOut, err := b.exe.Command(linuxGlusterMountBinary, "-V").CombinedOutput()
 	if err != nil {
-		return fmt.Errorf("Failed to get binary %s version", linuxGlusterMountBinary)
-	}
+		glog.Warningf("Failed to get binary %q version", linuxGlusterMountBinary)
+	} else {
 		//cmdOut will be filled as shown below.
 		/*
 				[root@]# mount.glusterfs -V
@@ -419,13 +420,12 @@ func (b *glusterfsMounter) setUpAtInternal(dir string) error {
 			}
 		}
 
-	mountOptions := volume.JoinMountOptions(b.mountOptions, options)
-
 		for i := len(mountOptions) - 1; i >= 0; i-- {
 			if mountOptions[i] == "auto_unmount" && mountBinaryVerStr != "" && mountBinaryVerStr < autoUnmountBinaryVer {
 				mountOptions = append(mountOptions[:i], mountOptions[i+1:]...)
 			}
 		}
+	}
 
 	// Avoid mount storm, pick a host randomly.
 	// Iterate all hosts until mount succeeds.