func main() {
flag.Usage = Usage
flag.Parse()
if flag.NArg() != 1 {
Usage()
os.Exit(2)
}
mountpoint := flag.Arg(0)
c, err := fuse.Mount(
mountpoint,
fuse.FSName("helloworld"),
fuse.Subtype("hellofs"),
fuse.LocalVolume(),
fuse.VolumeName("Hello world!"),
)
if err != nil {
log.Fatal(err)
}
defer c.Close()
err = fs.Serve(c, FS{})
if err != nil {
log.Fatal(err)
}
// check if the mount process has an error to report
<-c.Ready
if err := c.MountError; err != nil {
log.Fatal(err)
}
}
//
// Main function.
// - Exposes remote FS structure locally using FUSE (bazil-fuse)
// - Gets files from remote on-demand
// - TODO:
// - Check-in files to remote
// - Version control
//
func Revelo(Name string, accType string, cacheDir string, mntDir string) error {
GlobalData.metaName = Name + ".meta"
acc, err := initAccess(accType, mntDir)
if err != nil {
log.Errorf("Revelo: Invalid Access type: %v", accType)
return err
}
remoteDir, err := acc.Init()
if err != nil {
log.WithFields(log.Fields{"Acc": acc, "Error": err}).Error("Revelo: Cannot init access")
return err
}
GlobalData.cacheDir = cacheDir
GlobalData.mntDir = mntDir
log.WithFields(log.Fields{
"Access": acc,
"CacheDir": cacheDir,
"mntDir": mntDir,
"RemoteDir": remoteDir,
}).Info("Revelo - Init done...")
_, err = os.Stat(cacheDir + "/" + GlobalData.metaName)
// If some error happened here, we might fail in open later.
// Its better not to GetFile in that case.
// Get meta from <name>.meta file
metaPresent := ((err == nil) || !os.IsNotExist(err))
if metaPresent == false {
var metaName string
if remoteDir == "" {
metaName = GlobalData.metaName
} else {
metaName = remoteDir + "/" + GlobalData.metaName
}
err = acc.GetFile(metaName, cacheDir+"/"+GlobalData.metaName)
if err != nil {
log.WithFields(log.Fields{
"Remote": metaName,
"Local": cacheDir + "/" + GlobalData.metaName,
"AccData": acc,
}).Error("Revelo: Cannot get meta file")
return err
}
} else {
log.Info("Revelo: Meta file present, using it...")
}
metaFile, err := os.Open(cacheDir + "/" + GlobalData.metaName)
if err != nil {
log.WithFields(log.Fields{
"Meta File": cacheDir + "/" + GlobalData.metaName,
"Error": err,
}).Error("Cannot open meta file")
return err
}
defer metaFile.Close()
st, _ := metaFile.Stat() //XXX This should not fail
metaData := make([]byte, st.Size()+1)
n, err := metaFile.Read(metaData)
if err != nil || n == 0 {
log.WithFields(log.Fields{
"Meta File": cacheDir + "/" + GlobalData.metaName,
"Read bytes": n,
"Error": err,
}).Error("Revelo: Cannot read meta file, error or empty")
return syscall.EINVAL
}
// Unmarshal the meta data
metaData = metaData[:n]
meta := new(horcrux.Meta)
err = json.Unmarshal(metaData, meta)
if err != nil {
log.WithFields(log.Fields{
"Meta Data": string(metaData),
"Error": err,
}).Error("Revelo: Cannot unmarshal meta data")
return err
}
// Create dirTree
GlobalData.Root, err = dirTree.Create(meta)
GlobalData.Config = meta.Config
GlobalData.CurrVer = meta.CurrVer
GlobalData.NumFiles = meta.NumFiles
// Mount local
fuseConn, err := fuse.Mount(mntDir,
fuse.FSName("Horcrux"),
fuse.Subtype("Horcrux-"+acc.Name()),
fuse.MaxReadahead(128*(1<<10)),
fuse.AllowOther()) //XXX : Revisit AllowOther
if err != nil {
log.WithFields(log.Fields{"Conn": fuseConn, "Error": err}).Error("Mount Failed")
return err
}
defer fuseConn.Close()
GlobalData.fuseConn = fuseConn
log.Debugf("Mount OK: %v", GlobalData.CurrVer)
horcruxFS := &FS{Acc: &acc, RData: &GlobalData, remoteDir: remoteDir, cacheDir: cacheDir}
err = fs.Serve(fuseConn, horcruxFS)
if err != nil {
log.WithFields(log.Fields{"Conn": fuseConn, "Error": err}).Error("Cannot fs.Serve")
return err
}
<-fuseConn.Ready
if err := fuseConn.MountError; err != nil {
log.WithFields(log.Fields{"Conn": fuseConn, "Error": err}).Error("Mount Failed")
return err
}
log.Info("Revelo Done...")
return nil
}