Merge pull request #158 from kklin/sftp-openfile

sftpfs: Implement OpenFile method

sftpfs/sftp.go

@@ -94,8 +94,14 @@ func (s Fs) Open(name string) (afero.File, error) {
 	return FileOpen(s.client, name)
 }
 
+// OpenFile calls the OpenFile method on the SSHFS connection. The mode argument
+// is ignored because it's ignored by the github.com/pkg/sftp implementation.
 func (s Fs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
-	return nil, nil
+	sshfsFile, err := s.client.OpenFile(name, flag)
+	if err != nil {
+		return nil, err
+	}
+	return &File{fd: sshfsFile}, nil
 }
 
 func (s Fs) Remove(name string) error {