weed mount add symlink support

6 files changed, 195 insertions, 115 deletions

diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index bb33eb48e..6cd4df6b4 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -97,6 +97,7 @@ message FuseAttributes {
     int32 ttl_sec = 10;
     string user_name = 11; // for hdfs
     repeated string group_name = 12; // for hdfs
+    string symlink_target = 13;
 }
 
 message CreateEntryRequest {
diff --git a/weed/filer2/entry.go b/weed/filer2/entry.go
index f5c883d44..f17a11727 100644
--- a/weed/filer2/entry.go
+++ b/weed/filer2/entry.go
@@ -8,17 +8,18 @@ import (
 )
 
 type Attr struct {
-	Mtime       time.Time   // time of last modification
-	Crtime      time.Time   // time of creation (OS X only)
-	Mode        os.FileMode // file mode
-	Uid         uint32      // owner uid
-	Gid         uint32      // group gid
-	Mime        string      // mime type
-	Replication string      // replication
-	Collection  string      // collection name
-	TtlSec      int32       // ttl in seconds
-	UserName    string
-	GroupNames  []string
+	Mtime         time.Time   // time of last modification
+	Crtime        time.Time   // time of creation (OS X only)
+	Mode          os.FileMode // file mode
+	Uid           uint32      // owner uid
+	Gid           uint32      // group gid
+	Mime          string      // mime type
+	Replication   string      // replication
+	Collection    string      // collection name
+	TtlSec        int32       // ttl in seconds
+	UserName      string
+	GroupNames    []string
+	SymlinkTarget string
 }
 
 func (attr Attr) IsDirectory() bool {
diff --git a/weed/filer2/entry_codec.go b/weed/filer2/entry_codec.go
index 71b0dea40..e50b3fa9a 100644
--- a/weed/filer2/entry_codec.go
+++ b/weed/filer2/entry_codec.go
@@ -35,17 +35,18 @@ func (entry *Entry) DecodeAttributesAndChunks(blob []byte) error {
 func EntryAttributeToPb(entry *Entry) *filer_pb.FuseAttributes {
 
 	return &filer_pb.FuseAttributes{
-		Crtime:      entry.Attr.Crtime.Unix(),
-		Mtime:       entry.Attr.Mtime.Unix(),
-		FileMode:    uint32(entry.Attr.Mode),
-		Uid:         entry.Uid,
-		Gid:         entry.Gid,
-		Mime:        entry.Mime,
-		Collection:  entry.Attr.Collection,
-		Replication: entry.Attr.Replication,
-		TtlSec:      entry.Attr.TtlSec,
-		UserName:    entry.Attr.UserName,
-		GroupName:   entry.Attr.GroupNames,
+		Crtime:        entry.Attr.Crtime.Unix(),
+		Mtime:         entry.Attr.Mtime.Unix(),
+		FileMode:      uint32(entry.Attr.Mode),
+		Uid:           entry.Uid,
+		Gid:           entry.Gid,
+		Mime:          entry.Mime,
+		Collection:    entry.Attr.Collection,
+		Replication:   entry.Attr.Replication,
+		TtlSec:        entry.Attr.TtlSec,
+		UserName:      entry.Attr.UserName,
+		GroupName:     entry.Attr.GroupNames,
+		SymlinkTarget: entry.Attr.SymlinkTarget,
 	}
 }
 
@@ -64,6 +65,7 @@ func PbToEntryAttribute(attr *filer_pb.FuseAttributes) Attr {
 	t.TtlSec = attr.TtlSec
 	t.UserName = attr.UserName
 	t.GroupNames = attr.GroupName
+	t.SymlinkTarget = attr.SymlinkTarget
 
 	return t
 }
diff --git a/weed/filesys/dir_link.go b/weed/filesys/dir_link.go
new file mode 100644
index 000000000..5870cf3a4
--- /dev/null
+++ b/weed/filesys/dir_link.go
@@ -0,0 +1,66 @@
+package filesys
+
+import (
+	"context"
+	"os"
+	"syscall"
+	"time"
+
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+var _ = fs.NodeSymlinker(&Dir{})
+var _ = fs.NodeReadlinker(&File{})
+
+func (dir *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (fs.Node, error) {
+
+	glog.V(3).Infof("Symlink: %v/%v to %v", dir.Path, req.NewName, req.Target)
+
+	request := &filer_pb.CreateEntryRequest{
+		Directory: dir.Path,
+		Entry: &filer_pb.Entry{
+			Name:        req.NewName,
+			IsDirectory: false,
+			Attributes: &filer_pb.FuseAttributes{
+				Mtime:         time.Now().Unix(),
+				Crtime:        time.Now().Unix(),
+				FileMode:      uint32(os.FileMode(0755) | os.ModeSymlink),
+				Uid:           req.Uid,
+				Gid:           req.Gid,
+				SymlinkTarget: req.Target,
+			},
+		},
+	}
+
+	err := dir.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		if _, err := client.CreateEntry(ctx, request); err != nil {
+			glog.V(0).Infof("symlink %s/%s: %v", dir.Path, req.NewName, err)
+			return fuse.EIO
+		}
+		return nil
+	})
+
+	symlink := dir.newFile(req.NewName, request.Entry)
+
+	return symlink, err
+
+}
+
+func (file *File) Readlink(ctx context.Context, req *fuse.ReadlinkRequest) (string, error) {
+
+	if err := file.maybeLoadAttributes(ctx); err != nil {
+		return "", err
+	}
+
+	if os.FileMode(file.entry.Attributes.FileMode)&os.ModeSymlink == 0 {
+		return "", fuse.Errno(syscall.EINVAL)
+	}
+
+	glog.V(3).Infof("Readlink: %v/%v => %v", file.dir.Path, file.Name, file.entry.Attributes.SymlinkTarget)
+
+	return file.entry.Attributes.SymlinkTarget, nil
+
+}
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index bb33eb48e..6cd4df6b4 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -97,6 +97,7 @@ message FuseAttributes {
     int32 ttl_sec = 10;
     string user_name = 11; // for hdfs
     repeated string group_name = 12; // for hdfs
+    string symlink_target = 13;
 }
 
 message CreateEntryRequest {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 527555f36..6b4a27c0a 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -297,18 +297,19 @@ func (m *FileChunk) GetSourceFileId() string {
 }
 
 type FuseAttributes struct {
-	FileSize    uint64   `protobuf:"varint,1,opt,name=file_size,json=fileSize" json:"file_size,omitempty"`
-	Mtime       int64    `protobuf:"varint,2,opt,name=mtime" json:"mtime,omitempty"`
-	FileMode    uint32   `protobuf:"varint,3,opt,name=file_mode,json=fileMode" json:"file_mode,omitempty"`
-	Uid         uint32   `protobuf:"varint,4,opt,name=uid" json:"uid,omitempty"`
-	Gid         uint32   `protobuf:"varint,5,opt,name=gid" json:"gid,omitempty"`
-	Crtime      int64    `protobuf:"varint,6,opt,name=crtime" json:"crtime,omitempty"`
-	Mime        string   `protobuf:"bytes,7,opt,name=mime" json:"mime,omitempty"`
-	Replication string   `protobuf:"bytes,8,opt,name=replication" json:"replication,omitempty"`
-	Collection  string   `protobuf:"bytes,9,opt,name=collection" json:"collection,omitempty"`
-	TtlSec      int32    `protobuf:"varint,10,opt,name=ttl_sec,json=ttlSec" json:"ttl_sec,omitempty"`
-	UserName    string   `protobuf:"bytes,11,opt,name=user_name,json=userName" json:"user_name,omitempty"`
-	GroupName   []string `protobuf:"bytes,12,rep,name=group_name,json=groupName" json:"group_name,omitempty"`
+	FileSize      uint64   `protobuf:"varint,1,opt,name=file_size,json=fileSize" json:"file_size,omitempty"`
+	Mtime         int64    `protobuf:"varint,2,opt,name=mtime" json:"mtime,omitempty"`
+	FileMode      uint32   `protobuf:"varint,3,opt,name=file_mode,json=fileMode" json:"file_mode,omitempty"`
+	Uid           uint32   `protobuf:"varint,4,opt,name=uid" json:"uid,omitempty"`
+	Gid           uint32   `protobuf:"varint,5,opt,name=gid" json:"gid,omitempty"`
+	Crtime        int64    `protobuf:"varint,6,opt,name=crtime" json:"crtime,omitempty"`
+	Mime          string   `protobuf:"bytes,7,opt,name=mime" json:"mime,omitempty"`
+	Replication   string   `protobuf:"bytes,8,opt,name=replication" json:"replication,omitempty"`
+	Collection    string   `protobuf:"bytes,9,opt,name=collection" json:"collection,omitempty"`
+	TtlSec        int32    `protobuf:"varint,10,opt,name=ttl_sec,json=ttlSec" json:"ttl_sec,omitempty"`
+	UserName      string   `protobuf:"bytes,11,opt,name=user_name,json=userName" json:"user_name,omitempty"`
+	GroupName     []string `protobuf:"bytes,12,rep,name=group_name,json=groupName" json:"group_name,omitempty"`
+	SymlinkTarget string   `protobuf:"bytes,13,opt,name=symlink_target,json=symlinkTarget" json:"symlink_target,omitempty"`
 }
 
 func (m *FuseAttributes) Reset()                    { *m = FuseAttributes{} }
@@ -400,6 +401,13 @@ func (m *FuseAttributes) GetGroupName() []string {
 	return nil
 }
 
+func (m *FuseAttributes) GetSymlinkTarget() string {
+	if m != nil {
+		return m.SymlinkTarget
+	}
+	return ""
+}
+
 type CreateEntryRequest struct {
 	Directory string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
 	Entry     *Entry `protobuf:"bytes,2,opt,name=entry" json:"entry,omitempty"`
@@ -1151,85 +1159,86 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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