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