lib/sd-activation: wrap coreos/go-systemd

It fails to build on plan9, which is part of the rclone CI matrix, and
the PR fixing it upstream doesn't seem to be getting traction.

Stub it on our side, we can still remove this once it gets merged.

cmd/serve/sftp/server.go

@@ -21,13 +21,13 @@ 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"
 	"github.com/rclone/rclone/fs/config"
 	"github.com/rclone/rclone/lib/env"
 	"github.com/rclone/rclone/lib/file"
+	sdActivation "github.com/rclone/rclone/lib/sd-activation"
 	"github.com/rclone/rclone/vfs"
 	"github.com/rclone/rclone/vfs/vfsflags"
 	"golang.org/x/crypto/ssh"

lib/http/server.go

@@ -18,10 +18,10 @@ import (
 	"sync"
 	"time"
 
-	sdActivation "github.com/coreos/go-systemd/v22/activation"
 	"github.com/go-chi/chi/v5"
 	"github.com/rclone/rclone/fs/config/flags"
 	"github.com/rclone/rclone/lib/atexit"
+	sdActivation "github.com/rclone/rclone/lib/sd-activation"
 	"github.com/spf13/pflag"
 )
 

lib/sd-activation/sd_activation_stub.go

@@ -0,0 +1,25 @@
+// Package sd_activate provides support for systemd socket activation,
+// wrapping the coreos/go-systemd package.
+// This wraps the underlying go-systemd binary, as it fails to build on plan9
+// https://github.com/coreos/go-systemd/pull/440
+
+//go:build windows || plan9
+// +build windows plan9
+
+package sd_activate
+
+import (
+	"net"
+)
+
+// ListenersWithNames maps a listener name to a set of net.Listener instances.
+// This wraps the underlying go-systemd binary, as it fails to build on plan9
+// https://github.com/coreos/go-systemd/pull/440
+func ListenersWithNames() (map[string][]net.Listener, error) {
+	return make(map[string][]net.Listener), nil
+}
+
+// Listeners returns a slice containing a net.Listener for each matching socket type passed to this process.
+func Listeners() ([]net.Listener, error) {
+	return nil, nil
+}

lib/sd-activation/sd_activation_unix.go

@@ -0,0 +1,24 @@
+// Package sd_activate provides support for systemd socket activation,
+// wrapping the coreos/go-systemd package.
+// This wraps the underlying go-systemd binary, as it fails to build on plan9
+// https://github.com/coreos/go-systemd/pull/440
+
+//go:build !windows && !plan9
+// +build !windows,!plan9
+
+package sd_activate
+
+import (
+	sdActivation "github.com/coreos/go-systemd/v22/activation"
+	"net"
+)
+
+// ListenersWithNames maps a listener name to a set of net.Listener instances.
+func ListenersWithNames() (map[string][]net.Listener, error) {
+	return sdActivation.ListenersWithNames()
+}
+
+// ….
+func Listeners() ([]net.Listener, error) {
+	return sdActivation.Listeners()
+}