serve sftp: add serve rc interface

cmd/serve/sftp/server.go

@@ -16,6 +16,7 @@ import (
 	"encoding/pem"
 	"errors"
 	"fmt"
+	"io"
 	"net"
 	"os"
 	"path/filepath"
@@ -40,23 +41,27 @@ type server struct {
 	ctx      context.Context // for global config
 	config   *ssh.ServerConfig
 	listener net.Listener
-	waitChan chan struct{} // for waiting on the listener to close
+	stopped  chan struct{} // for waiting on the listener to stop
 	proxy    *proxy.Proxy
 }
 
-func newServer(ctx context.Context, f fs.Fs, opt *Options) *server {
+func newServer(ctx context.Context, f fs.Fs, opt *Options, vfsOpt *vfscommon.Options, proxyOpt *proxy.Options) (*server, error) {
 	s := &server{
-		f:        f,
-		ctx:      ctx,
-		opt:      *opt,
-		waitChan: make(chan struct{}),
+		f:       f,
+		ctx:     ctx,
+		opt:     *opt,
+		stopped: make(chan struct{}),
 	}
 	if proxy.Opt.AuthProxy != "" {
-		s.proxy = proxy.New(ctx, &proxy.Opt, &vfscommon.Opt)
+		s.proxy = proxy.New(ctx, proxyOpt, vfsOpt)
 	} else {
-		s.vfs = vfs.New(f, &vfscommon.Opt)
+		s.vfs = vfs.New(f, vfsOpt)
 	}
-	return s
+	err := s.configure()
+	if err != nil {
+		return nil, fmt.Errorf("sftp configuration failed: %w", err)
+	}
+	return s, nil
 }
 
 // getVFS gets the vfs from s or the proxy
@@ -128,8 +133,10 @@ func (s *server) acceptConnections() {
 	}
 }
 
+// configure the server
+//
 // Based on example server code from golang.org/x/crypto/ssh and server_standalone
-func (s *server) serve() (err error) {
+func (s *server) configure() (err error) {
 	var authorizedKeysMap map[string]struct{}
 
 	// ensure the user isn't trying to use conflicting flags
@@ -292,42 +299,35 @@ func (s *server) serve() (err error) {
 		}
 	}
 	s.listener = listener
+	return nil
+}
+
+// Serve SFTP until the server is Shutdown
+func (s *server) Serve() (err error) {
 	fs.Logf(nil, "SFTP server listening on %v\n", s.listener.Addr())
-
-	go s.acceptConnections()
-
+	s.acceptConnections()
+	close(s.stopped)
 	return nil
 }
 
 // Addr returns the address the server is listening on
-func (s *server) Addr() string {
-	return s.listener.Addr().String()
-}
-
-// Serve runs the sftp server in the background.
-//
-// Use s.Close() and s.Wait() to shutdown server
-func (s *server) Serve() error {
-	err := s.serve()
-	if err != nil {
-		return err
-	}
-	return nil
+func (s *server) Addr() net.Addr {
+	return s.listener.Addr()
 }
 
 // Wait blocks while the listener is open.
 func (s *server) Wait() {
-	<-s.waitChan
+	<-s.stopped
 }
 
-// Close shuts the running server down
-func (s *server) Close() {
+// Shutdown shuts the running server down
+func (s *server) Shutdown() error {
 	err := s.listener.Close()
-	if err != nil {
-		fs.Errorf(nil, "Error on closing SFTP server: %v", err)
-		return
+	if errors.Is(err, io.ErrUnexpectedEOF) {
+		err = nil
 	}
-	close(s.waitChan)
+	s.Wait()
+	return err
 }
 
 func loadPrivateKey(keyPath string) (ssh.Signer, error) {

cmd/serve/sftp/sftp.go

@@ -5,15 +5,19 @@ package sftp
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/rclone/rclone/cmd"
 	"github.com/rclone/rclone/cmd/serve"
 	"github.com/rclone/rclone/cmd/serve/proxy"
 	"github.com/rclone/rclone/cmd/serve/proxy/proxyflags"
 	"github.com/rclone/rclone/fs"
+	"github.com/rclone/rclone/fs/config/configstruct"
 	"github.com/rclone/rclone/fs/config/flags"
+	"github.com/rclone/rclone/fs/rc"
 	"github.com/rclone/rclone/lib/systemd"
 	"github.com/rclone/rclone/vfs"
+	"github.com/rclone/rclone/vfs/vfscommon"
 	"github.com/rclone/rclone/vfs/vfsflags"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -78,6 +82,28 @@ func init() {
 	proxyflags.AddFlags(Command.Flags())
 	AddFlags(Command.Flags(), &Opt)
 	serve.Command.AddCommand(Command)
+	serve.AddRc("sftp", func(ctx context.Context, f fs.Fs, in rc.Params) (serve.Handle, error) {
+		// Read VFS Opts
+		var vfsOpt = vfscommon.Opt // set default opts
+		err := configstruct.SetAny(in, &vfsOpt)
+		if err != nil {
+			return nil, err
+		}
+		// Read Proxy Opts
+		var proxyOpt = proxy.Opt // set default opts
+		err = configstruct.SetAny(in, &proxyOpt)
+		if err != nil {
+			return nil, err
+		}
+		// Read opts
+		var opt = Opt // set default opts
+		err = configstruct.SetAny(in, &opt)
+		if err != nil {
+			return nil, err
+		}
+		// Create server
+		return newServer(ctx, f, &opt, &vfsOpt, &proxyOpt)
+	})
 }
 
 // Command definition for cobra
@@ -164,14 +190,12 @@ provided by OpenSSH in this case.
 			if Opt.Stdio {
 				return serveStdio(f)
 			}
-			s := newServer(context.Background(), f, &Opt)
-			err := s.Serve()
+			s, err := newServer(context.Background(), f, &Opt, &vfscommon.Opt, &proxy.Opt)
 			if err != nil {
-				return err
+				fs.Fatal(nil, fmt.Sprint(err))
 			}
 			defer systemd.Notify()()
-			s.Wait()
-			return nil
+			return s.Serve()
 		})
 	},
 }

cmd/serve/sftp/sftp_test.go

@@ -14,10 +14,14 @@ import (
 
 	"github.com/pkg/sftp"
 	_ "github.com/rclone/rclone/backend/local"
+	"github.com/rclone/rclone/cmd/serve/proxy"
 	"github.com/rclone/rclone/cmd/serve/servetest"
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/config/configmap"
 	"github.com/rclone/rclone/fs/config/obscure"
+	"github.com/rclone/rclone/fs/rc"
+	"github.com/rclone/rclone/vfs/vfscommon"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -45,11 +49,14 @@ func TestSftp(t *testing.T) {
 		opt.User = testUser
 		opt.Pass = testPass
 
-		w := newServer(context.Background(), f, &opt)
-		require.NoError(t, w.serve())
+		w, err := newServer(context.Background(), f, &opt, &vfscommon.Opt, &proxy.Opt)
+		require.NoError(t, err)
+		go func() {
+			require.NoError(t, w.Serve())
+		}()
 
 		// Read the host and port we started on
-		addr := w.Addr()
+		addr := w.Addr().String()
 		colon := strings.LastIndex(addr, ":")
 
 		// Config for the backend we'll use to connect to the server
@@ -63,10 +70,18 @@ func TestSftp(t *testing.T) {
 
 		// return a stop function
 		return config, func() {
-			w.Close()
-			w.Wait()
+			assert.NoError(t, w.Shutdown())
 		}
 	}
 
 	servetest.Run(t, "sftp", start)
 }
+
+func TestRc(t *testing.T) {
+	servetest.TestRc(t, rc.Params{
+		"type":           "sftp",
+		"user":           "test",
+		"pass":           obscure.MustObscure("test"),
+		"vfs_cache_mode": "off",
+	})
+}