packet debugging with --debug

main-mshell.go

@@ -298,6 +298,10 @@ func parseClientOpts() (*shexec.ClientOpts, error) {
 			opts.Cwd = iter.Next()
 			continue
 		}
+		if argStr == "--debug" {
+			opts.Debug = true
+			continue
+		}
 	}
 	if opts.IsSSH {
 		// parse SSH opts

pkg/shexec/shexec.go

@@ -219,6 +219,7 @@ type ClientOpts struct {
 	Command     string
 	Fds         []packet.RemoteFd
 	Cwd         string
+	Debug       bool
 }
 
 func (opts *ClientOpts) MakeRunPacket() *packet.RunPacketType {
@@ -318,6 +319,9 @@ func RunClientSSHCommandAndWait(opts *ClientOpts) (*packet.CmdDonePacketType, er
 	}
 	runPacket := opts.MakeRunPacket()
 	sender.SendPacket(runPacket)
+	if opts.Debug {
+		cmd.Multiplexer.Debug = true
+	}
 	remoteDonePacket := cmd.Multiplexer.RunIOAndWait(packetCh, sender, false, true, true)
 	donePacket := cmd.WaitForCommand()
 	if remoteDonePacket != nil {