Add shim support for calling runsc create with --panic-log.

Making the panic log directory be inside of the normal user-log directory makes
it possible to simply reuse the same spec annotation.

PiperOrigin-RevId: 466785655

pkg/shim/proc/init.go

@@ -73,6 +73,7 @@ type Init struct {
 	IoGID    int
 	Sandbox  bool
 	UserLog  string
+	PanicLog string
 	Monitor  ProcessMonitor
 }
 

pkg/shim/runsc/runsc.go

@@ -108,6 +108,10 @@ type CreateOpts struct {
 
 	// UserLog is a path to where runsc user log should be generated.
 	UserLog string
+
+	// PanicLog is a path to where runsc will output its panic message
+	// (in case it does panic).
+	PanicLog string
 }
 
 func (o *CreateOpts) args() (out []string, err error) {
@@ -124,6 +128,9 @@ func (o *CreateOpts) args() (out []string, err error) {
 	if o.UserLog != "" {
 		out = append(out, "--user-log", o.UserLog)
 	}
+	if o.PanicLog != "" {
+		out = append(out, "--panic-log", o.PanicLog)
+	}
 	return out, nil
 }
 

pkg/shim/service.go

@@ -1097,6 +1097,7 @@ func newInit(path, workDir, namespace string, platform stdio.Platform, r *proc.C
 	p.IoGID = int(options.IoGID)
 	p.Sandbox = specutils.SpecContainerType(spec) == specutils.ContainerTypeSandbox
 	p.UserLog = utils.UserLogPath(spec)
+	p.PanicLog = utils.PanicLogPath(spec)
 	p.Monitor = reaper.Default
 	return p, nil
 }

pkg/shim/utils/utils.go

@@ -61,3 +61,12 @@ func UserLogPath(spec *specs.Spec) string {
 	}
 	return filepath.Join(sandboxLogDir, "gvisor.log")
 }
+
+// PanicLogPath gets the panic log path from OCI annotation.
+func PanicLogPath(spec *specs.Spec) string {
+	sandboxLogDir := spec.Annotations[sandboxLogDirAnnotation]
+	if sandboxLogDir == "" {
+		return ""
+	}
+	return filepath.Join(sandboxLogDir, "gvisor_panic.log")
+}