runsc/debug: add an option to list all processes

runsc debug --ps list all processes with all threads. This option is added to
the debug command but not to the ps command, because it is going to be used for
debug purposes and we want to add any useful information without thinking about
backward compatibility.

This will help to investigate syzkaller issues.

PiperOrigin-RevId: 285013668

1 files changed, 13 insertions, 0 deletions

diff --git a/runsc/cmd/debug.go b/runsc/cmd/debug.go
index 38da7ee02..f37415810 100644
--- a/runsc/cmd/debug.go
+++ b/runsc/cmd/debug.go
@@ -42,6 +42,7 @@ type Debug struct {
 	logLevel    string
 	logPackets  string
 	duration    time.Duration
+	ps          bool
 }
 
 // Name implements subcommands.Command.
@@ -71,6 +72,7 @@ func (d *Debug) SetFlags(f *flag.FlagSet) {
 	f.StringVar(&d.strace, "strace", "", `A comma separated list of syscalls to trace. "all" enables all traces, "off" disables all`)
 	f.StringVar(&d.logLevel, "log-level", "", "The log level to set: warning (0), info (1), or debug (2).")
 	f.StringVar(&d.logPackets, "log-packets", "", "A boolean value to enable or disable packet logging: true or false.")
+	f.BoolVar(&d.ps, "ps", false, "lists processes")
 }
 
 // Execute implements subcommands.Command.Execute.
@@ -240,6 +242,17 @@ func (d *Debug) Execute(_ context.Context, f *flag.FlagSet, args ...interface{})
 		}
 		log.Infof("Logging options changed")
 	}
+	if d.ps {
+		pList, err := c.Processes()
+		if err != nil {
+			Fatalf("getting processes for container: %v", err)
+		}
+		o, err := control.ProcessListToJSON(pList)
+		if err != nil {
+			Fatalf("generating JSON: %v", err)
+		}
+		log.Infof(o)
+	}
 
 	if delay {
 		time.Sleep(d.duration)