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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"context"
"os"
"syscall"
"time"
"flag"
"github.com/google/subcommands"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/runsc/boot"
"gvisor.dev/gvisor/runsc/container"
)
// Debug implements subcommands.Command for the "debug" command.
type Debug struct {
pid int
stacks bool
signal int
profileHeap string
profileCPU string
profileDelay int
trace string
}
// Name implements subcommands.Command.
func (*Debug) Name() string {
return "debug"
}
// Synopsis implements subcommands.Command.
func (*Debug) Synopsis() string {
return "shows a variety of debug information"
}
// Usage implements subcommands.Command.
func (*Debug) Usage() string {
return `debug [flags] <container id>`
}
// SetFlags implements subcommands.Command.
func (d *Debug) SetFlags(f *flag.FlagSet) {
f.IntVar(&d.pid, "pid", 0, "sandbox process ID. Container ID is not necessary if this is set")
f.BoolVar(&d.stacks, "stacks", false, "if true, dumps all sandbox stacks to the log")
f.StringVar(&d.profileHeap, "profile-heap", "", "writes heap profile to the given file.")
f.StringVar(&d.profileCPU, "profile-cpu", "", "writes CPU profile to the given file.")
f.IntVar(&d.profileDelay, "profile-delay", 5, "amount of time to wait before stoping CPU profile")
f.StringVar(&d.trace, "trace", "", "writes an execution trace to the given file.")
f.IntVar(&d.signal, "signal", -1, "sends signal to the sandbox")
}
// Execute implements subcommands.Command.Execute.
func (d *Debug) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
var c *container.Container
conf := args[0].(*boot.Config)
if d.pid == 0 {
// No pid, container ID must have been provided.
if f.NArg() != 1 {
f.Usage()
return subcommands.ExitUsageError
}
var err error
c, err = container.Load(conf.RootDir, f.Arg(0))
if err != nil {
Fatalf("loading container %q: %v", f.Arg(0), err)
}
} else {
if f.NArg() != 0 {
f.Usage()
return subcommands.ExitUsageError
}
// Go over all sandboxes and find the one that matches PID.
ids, err := container.List(conf.RootDir)
if err != nil {
Fatalf("listing containers: %v", err)
}
for _, id := range ids {
candidate, err := container.Load(conf.RootDir, id)
if err != nil {
Fatalf("loading container %q: %v", id, err)
}
if candidate.SandboxPid() == d.pid {
c = candidate
break
}
}
if c == nil {
Fatalf("container with PID %d not found", d.pid)
}
}
if c.Sandbox == nil || !c.Sandbox.IsRunning() {
Fatalf("container sandbox is not running")
}
log.Infof("Found sandbox %q, PID: %d", c.Sandbox.ID, c.Sandbox.Pid)
if d.signal > 0 {
log.Infof("Sending signal %d to process: %d", d.signal, c.Sandbox.Pid)
if err := syscall.Kill(c.Sandbox.Pid, syscall.Signal(d.signal)); err != nil {
Fatalf("failed to send signal %d to processs %d", d.signal, c.Sandbox.Pid)
}
}
if d.stacks {
log.Infof("Retrieving sandbox stacks")
stacks, err := c.Sandbox.Stacks()
if err != nil {
Fatalf("retrieving stacks: %v", err)
}
log.Infof(" *** Stack dump ***\n%s", stacks)
}
if d.profileHeap != "" {
f, err := os.Create(d.profileHeap)
if err != nil {
Fatalf(err.Error())
}
defer f.Close()
if err := c.Sandbox.HeapProfile(f); err != nil {
Fatalf(err.Error())
}
log.Infof("Heap profile written to %q", d.profileHeap)
}
delay := false
if d.profileCPU != "" {
delay = true
f, err := os.Create(d.profileCPU)
if err != nil {
Fatalf(err.Error())
}
defer func() {
f.Close()
if err := c.Sandbox.StopCPUProfile(); err != nil {
Fatalf(err.Error())
}
log.Infof("CPU profile written to %q", d.profileCPU)
}()
if err := c.Sandbox.StartCPUProfile(f); err != nil {
Fatalf(err.Error())
}
log.Infof("CPU profile started for %d sec, writing to %q", d.profileDelay, d.profileCPU)
}
if d.trace != "" {
delay = true
f, err := os.Create(d.trace)
if err != nil {
Fatalf(err.Error())
}
defer func() {
f.Close()
if err := c.Sandbox.StopTrace(); err != nil {
Fatalf(err.Error())
}
log.Infof("Trace written to %q", d.trace)
}()
if err := c.Sandbox.StartTrace(f); err != nil {
Fatalf(err.Error())
}
log.Infof("Tracing started for %d sec, writing to %q", d.profileDelay, d.trace)
}
if delay {
time.Sleep(time.Duration(d.profileDelay) * time.Second)
}
return subcommands.ExitSuccess
}
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