update commands when running in supervised mode

ocis-pkg/config/config.go

@@ -57,8 +57,20 @@ type TokenManager struct {
 	JWTSecret string
 }
 
+const (
+	// SUPERVISED sets the runtime mode as supervised threads.
+	SUPERVISED = iota
+
+	// UNSUPERVISED sets the runtime mode as a single thread.
+	UNSUPERVISED
+)
+
+type Mode int
+
 // Config combines all available configuration parts.
 type Config struct {
+	Mode Mode
+
 	Registry     string
 	Log          Log
 	Debug        Debug

ocis-pkg/go.sum

@@ -811,6 +811,7 @@ github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/J
 github.com/haya14busa/goverage v0.0.0-20180129164344-eec3514a20b5/go.mod h1:0YZ2wQSuwviXXXGUiK6zXzskyBLAbLXhamxzcFHSLoM=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/huandu/xstrings v1.2.0/go.mod h1:DvyZB1rfVYsBIigL8HwpZgxHwXozlTgGqn63UyNX5k4=
+github.com/huandu/xstrings v1.3.0 h1:gvV6jG9dTgFEncxo+AF7PH6MZXi/vZl25owA/8Dg8Wo=
 github.com/huandu/xstrings v1.3.0/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
 github.com/huandu/xstrings v1.3.2 h1:L18LIDzqlW6xN2rEkpdV8+oL/IXWJ1APd+vsdYy4Wdw=
 github.com/huandu/xstrings v1.3.2/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
@@ -1434,6 +1435,7 @@ github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpP
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA=
 github.com/tecbot/gorocksdb v0.0.0-20191217155057-f0fad39f321c/go.mod h1:ahpPrc7HpcfEWDQRZEmnXMzHY03mLDYMCxeDzy46i+8=
 github.com/technoweenie/multipartstreamer v1.0.1/go.mod h1:jNVxdtShOxzAsukZwTSw6MDx5eUJoiEBsSvzDU9uzog=
+github.com/thejerf/suture v4.0.0+incompatible h1:luAwgEo87y1X30wEYa64N4SKMrsAm9qXRwNxnLVuuwg=
 github.com/thejerf/suture v4.0.0+incompatible/go.mod h1:ibKwrVj+Uzf3XZdAiNWUouPaAbSoemxOHLmJmwheEMc=
 github.com/tidwall/gjson v1.3.2/go.mod h1:P256ACg0Mn+j1RXIDXoss50DeIABTYK1PULOJHhxOls=
 github.com/tidwall/match v1.0.1/go.mod h1:LujAq0jyVjBy028G1WhWfIzbpQfMO8bBZ6Tyb0+pL9E=

ocis-pkg/sync/trap.go

@@ -0,0 +1,22 @@
+package sync
+
+import (
+	"context"
+	"os"
+	"os/signal"
+
+	"github.com/oklog/run"
+)
+
+// Trap listens to interrupt signals and handles context cancellation and channel closing on a group run.
+func Trap(gr *run.Group, cancel context.CancelFunc) {
+	stop := make(chan os.Signal, 1)
+	gr.Add(func() error {
+		signal.Notify(stop, os.Interrupt)
+		<-stop
+		return nil
+	}, func(err error) {
+		close(stop)
+		cancel()
+	})
+}