small fixes and dependency updates

vendor/github.com/pkg/sftp/request.go

@@ -187,6 +187,7 @@ func requestFromPacket(ctx context.Context, pkt hasPath, baseDir string) *Reques
 		// NOTE: given a POSIX compliant signature: symlink(target, linkpath string)
 		// this makes Request.Target the linkpath, and Request.Filepath the target.
 		request.Target = cleanPathWithBase(baseDir, p.Linkpath)
+		request.Filepath = p.Targetpath
 	case *sshFxpExtendedPacketHardlink:
 		request.Target = cleanPathWithBase(baseDir, p.Newpath)
 	}
@@ -294,7 +295,12 @@ func (r *Request) call(handlers Handlers, pkt requestPacket, alloc *allocator, o
 		return filecmd(handlers.FileCmd, r, pkt)
 	case "List":
 		return filelist(handlers.FileList, r, pkt)
-	case "Stat", "Lstat", "Readlink":
+	case "Stat", "Lstat":
+		return filestat(handlers.FileList, r, pkt)
+	case "Readlink":
+		if readlinkFileLister, ok := handlers.FileList.(ReadlinkFileLister); ok {
+			return readlink(readlinkFileLister, r, pkt)
+		}
 		return filestat(handlers.FileList, r, pkt)
 	default:
 		return statusFromError(pkt.id(), fmt.Errorf("unexpected method: %s", r.Method))
@@ -598,6 +604,23 @@ func filestat(h FileLister, r *Request, pkt requestPacket) responsePacket {
 	}
 }
 
+func readlink(readlinkFileLister ReadlinkFileLister, r *Request, pkt requestPacket) responsePacket {
+	resolved, err := readlinkFileLister.Readlink(r.Filepath)
+	if err != nil {
+		return statusFromError(pkt.id(), err)
+	}
+	return &sshFxpNamePacket{
+		ID: pkt.id(),
+		NameAttrs: []*sshFxpNameAttr{
+			{
+				Name:     resolved,
+				LongName: resolved,
+				Attrs:    emptyFileStat,
+			},
+		},
+	}
+}
+
 // init attributes of request object from packet data
 func requestMethod(p requestPacket) (method string) {
 	switch p.(type) {