func main() {
// Scans the arg list and sets up flags
debug := flag.Bool("debug", false, "print debugging messages.")
flag.Parse()
if flag.NArg() < 2 {
// TODO - where to get program name?
fmt.Println("usage: main MOUNTPOINT BACKING-PREFIX")
os.Exit(2)
}
mountPoint := flag.Arg(0)
prefix := flag.Arg(1)
fs := fuse.NewMemNodeFs(prefix)
conn := fuse.NewFileSystemConnector(fs, nil)
state := fuse.NewMountState(conn)
state.Debug = *debug
fmt.Println("Mounting")
err := state.Mount(mountPoint, nil)
if err != nil {
fmt.Printf("Mount fail: %v\n", err)
os.Exit(1)
}
fmt.Println("Mounted!")
state.Loop()
}
func newWorkerFuseFs(tmpDir string, rpcFs fuse.FileSystem, writableRoot string, nobody *User) (*workerFuseFs, error) {
tmpDir, err := ioutil.TempDir(tmpDir, "termite-task")
if err != nil {
return nil, err
}
me := &workerFuseFs{
tmpDir: tmpDir,
writableRoot: strings.TrimLeft(writableRoot, "/"),
tasks: map[*WorkerTask]bool{},
}
type dirInit struct {
dst *string
val string
}
tmpBacking := ""
for _, v := range []dirInit{
{&me.rwDir, "rw"},
{&me.mount, "mnt"},
{&tmpBacking, "tmp-backing"},
} {
*v.dst = filepath.Join(me.tmpDir, v.val)
err = os.Mkdir(*v.dst, 0700)
if err != nil {
return nil, err
}
}
fuseOpts := fuse.MountOptions{}
if os.Geteuid() == 0 {
fuseOpts.AllowOther = true
}
me.rpcNodeFs = fuse.NewPathNodeFs(rpcFs, nil)
ttl := 30 * time.Second
mOpts := fuse.FileSystemOptions{
EntryTimeout: ttl,
AttrTimeout: ttl,
NegativeTimeout: ttl,
// 32-bit programs have trouble with 64-bit inode
// numbers.
PortableInodes: true,
}
me.fsConnector = fuse.NewFileSystemConnector(me.rpcNodeFs, &mOpts)
me.MountState = fuse.NewMountState(me.fsConnector)
err = me.MountState.Mount(me.mount, &fuseOpts)
if err != nil {
return nil, err
}
go me.MountState.Loop()
me.unionFs = fs.NewMemUnionFs(
me.rwDir, &fuse.PrefixFileSystem{rpcFs, me.writableRoot})
me.procFs = fs.NewProcFs()
me.procFs.StripPrefix = me.mount
if nobody != nil {
me.procFs.Uid = nobody.Uid
}
type submount struct {
mountpoint string
fs fuse.NodeFileSystem
}
mounts := []submount{
{"proc", fuse.NewPathNodeFs(me.procFs, nil)},
{"sys", fuse.NewPathNodeFs(&fuse.ReadonlyFileSystem{fuse.NewLoopbackFileSystem("/sys")}, nil)},
{"tmp", fuse.NewMemNodeFs(tmpBacking + "/tmp")},
{"dev", fs.NewDevNullFs()},
{"var/tmp", fuse.NewMemNodeFs(tmpBacking + "/vartmp")},
}
for _, s := range mounts {
subOpts := &mOpts
if s.mountpoint == "proc" {
subOpts = nil
}
code := me.rpcNodeFs.Mount(s.mountpoint, s.fs, subOpts)
if !code.Ok() {
if err := me.MountState.Unmount(); err != nil {
log.Fatal("FUSE unmount error during cleanup:", err)
}
return nil, errors.New(fmt.Sprintf("submount error for %s: %v", s.mountpoint, code))
}
}
if strings.HasPrefix(me.writableRoot, "tmp/") {
parent, _ := filepath.Split(me.writableRoot)
err := os.MkdirAll(filepath.Join(me.mount, parent), 0755)
if err != nil {
if err := me.MountState.Unmount(); err != nil {
log.Fatal("FUSE unmount error during cleanup:", err)
}
return nil, errors.New(fmt.Sprintf("Mkdir of %q in /tmp fail: %v", parent, err))
}
// This is hackish, but we don't want rpcfs/fsserver
// getting confused by asking for tmp/foo/bar
// directly.
rpcFs.GetAttr("tmp", nil)
rpcFs.GetAttr(me.writableRoot, nil)
}
code := me.rpcNodeFs.Mount(me.writableRoot, me.unionFs, &mOpts)
if !code.Ok() {
if err := me.MountState.Unmount(); err != nil {
log.Fatal("FUSE unmount error during cleanup:", err)
}
return nil, errors.New(fmt.Sprintf("submount error for %s: %v", me.writableRoot, code))
}
return me, nil
}