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sftp: support listening on passed FDs

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This commit is contained in:
Florian Klink 2024-04-25 00:14:42 +03:00 committed by Nick Craig-Wood
parent b29a22095f
commit 156feff9f2
2 changed files with 31 additions and 2 deletions
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22
cmd/serve/sftp/server.go
View File

@ -21,6 +21,7 @@ import (
"path/filepath"
"strings"
sdActivation "github.com/coreos/go-systemd/v22/activation"
"github.com/rclone/rclone/cmd/serve/proxy"
"github.com/rclone/rclone/cmd/serve/proxy/proxyflags"
"github.com/rclone/rclone/fs"
@ -266,10 +267,27 @@ func (s *server) serve() (err error) {
// Once a ServerConfig has been configured, connections can be
// accepted.
s.listener, err = net.Listen("tcp", s.opt.ListenAddr)
var listener net.Listener
// In case we run in a socket-activated environment, listen on (the first)
// passed FD.
sdListeners, err := sdActivation.Listeners()
if err != nil {
return fmt.Errorf("failed to listen for connection: %w", err)
return fmt.Errorf("unable to acquire listeners: %w", err)
}
if len(sdListeners) > 0 {
if len(sdListeners) > 1 {
fs.LogPrintf(fs.LogLevelWarning, nil, "more than one listener passed, ignoring all but the first.\n")
}
listener = sdListeners[0]
} else {
listener, err = net.Listen("tcp", s.opt.ListenAddr)
if err != nil {
return fmt.Errorf("failed to listen for connection: %w", err)
}
}
s.listener = listener
fs.Logf(nil, "SFTP server listening on %v\n", s.listener.Addr())
go s.acceptConnections()

11
cmd/serve/sftp/sftp.go
View File

@ -115,6 +115,17 @@ directory.
By default the server binds to localhost:2022 - if you want it to be
reachable externally then supply ` + "`--addr :2022`" + ` for example.
This also supports being run with socket activation, in which case it will
listen on the first passed FD.
It can be configured with .socket and .service unit files as described in
https://www.freedesktop.org/software/systemd/man/latest/systemd.socket.html
Socket activation can be tested ad-hoc with the ` + "`systemd-socket-activate`" + `command:
systemd-socket-activate -l 2222 -- rclone serve sftp :local:vfs/
This will socket-activate rclone on the first connection to port 2222 over TCP.
Note that the default of ` + "`--vfs-cache-mode off`" + ` is fine for the rclone
sftp backend, but it may not be with other SFTP clients.