weedfuse: adapt to fstab command line pattern

weed/command/weedfuse/README.md

@@ -0,0 +1,84 @@
+Mount the SeaweedFS via FUSE
+
+# Mount by fstab
+
+
+```
+$ # on linux
+$ sudo apt-get install fuse
+$ sudo echo 'user_allow_other' >> /etc/fuse.conf
+$ sudo mv weedfuse /sbin/mount.weedfuse
+
+$ # on Mac
+$ sudo mv weedfuse /sbin/mount_weedfuse
+
+```
+
+On both OS X and Linux, you can add one of the entries to your /etc/fstab file like the following:
+
+```
+# mount the whole SeaweedFS
+localhost:8888/    /home/some/mount/folder  weedfuse
+
+# mount the SeaweedFS sub folder
+localhost:8888/sub/dir    /home/some/mount/folder  weedfuse
+
+# mount the SeaweedFS sub folder with some options
+localhost:8888/sub/dir    /home/some/mount/folder  weedfuse  user
+
+```
+
+To verify it can work, try this command
+```
+$ sudo mount -av
+
+...
+
+/home/some/mount/folder           : successfully mounted
+
+```
+
+If you see `successfully mounted`, try to access the mounted folder and verify everything works.
+
+
+To debug, run these:
+```
+
+$ weedfuse -foreground localhost:8888/ /home/some/mount/folder
+
+```
+
+
+To unmount the folder:
+```
+
+$ sudo umount /home/some/mount/folder
+
+```
+
+<!-- not working yet!
+
+# Mount by autofs
+
+AutoFS can mount a folder if accessed.
+
+```
+# install autofs
+$ sudo apt-get install autofs
+```
+
+Here is an example on how to mount a folder for all users under `/home` directory.
+Assuming there exists corresponding folders under `/home` on both local and SeaweedFS.
+
+Edit `/etc/auto.master` and `/etc/auto.weedfuse` file with these content
+```
+$ cat /etc/auto.master
+/home    /etc/auto.weedfuse
+
+$ cat /etc/auto.weedfuse
+# map /home/<user> to localhost:8888/home/<user>
+* -fstype=weedfuse,rw,allow_other,foreground :localhost\:8888/home/&
+
+```
+
+-->

weed/command/weedfuse/weedfuse.go

@@ -13,20 +13,45 @@ import (
 )
 
 var (
-	options      = flag.String("o", "", "comma separated options rw,uid=xxx,gid=xxx")
-	isForeground = flag.Bool("foreground", false, "starts as a daemon")
+	fuseCommand  = flag.NewFlagSet("weedfuse", flag.ContinueOnError)
+	options      = fuseCommand.String("o", "", "comma separated options rw,uid=xxx,gid=xxx")
+	isForeground = fuseCommand.Bool("foreground", false, "starts as a daemon")
 )
 
 func main() {
 
-	flag.Parse()
+	err := fuseCommand.Parse(os.Args[1:])
+	if err != nil {
+		glog.Fatal(err)
+	}
+	fmt.Printf("options: %v\n", *options)
+
+	// seems this value is always empty, need to parse it differently
+	optionsString := *options
+	prev := ""
+	for i, arg := range os.Args {
+		fmt.Printf("args[%d]: %v\n", i, arg)
+		if prev == "-o" {
+			optionsString = arg
+		}
+		prev = arg
+	}
 
-	device := flag.Arg(0)
-	mountPoint := flag.Arg(1)
+	device := fuseCommand.Arg(0)
+	mountPoint := fuseCommand.Arg(1)
 
 	fmt.Printf("source: %v\n", device)
 	fmt.Printf("target: %v\n", mountPoint)
 
+	nouser := true
+	for _, option := range strings.Split(optionsString, ",") {
+		fmt.Printf("option: %v\n", option)
+		switch option {
+		case "user":
+			nouser = false
+		}
+	}
+
 	maybeSetupPath()
 
 	if !*isForeground {
@@ -39,7 +64,7 @@ func main() {
 
 	command.RunMount(
 		filer, "/"+filerPath, mountPoint, "", "000", "",
-		4, true, 0, 1000000)
+		4, !nouser, 0, 1000000)
 
 }