255 lines
6.4 KiB
Go
255 lines
6.4 KiB
Go
/*
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Copyright The containerd Authors.
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Copyright 2018 Google LLC
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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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https://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package proc
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import (
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"context"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"sync"
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"syscall"
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"time"
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"github.com/containerd/console"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/runtime/proc"
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"github.com/containerd/containerd/runtime/v1/shim"
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"github.com/containerd/fifo"
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runc "github.com/containerd/go-runc"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/pkg/errors"
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"golang.org/x/sys/unix"
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runsc "github.com/google/gvisor-containerd-shim/pkg/go-runsc"
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)
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type execProcess struct {
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wg sync.WaitGroup
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proc.State
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mu sync.Mutex
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id string
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console console.Console
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io runc.IO
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status int
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exited time.Time
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pid int
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internalPid int
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closers []io.Closer
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stdin io.Closer
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stdio proc.Stdio
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path string
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spec specs.Process
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parent *Init
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waitBlock chan struct{}
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}
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func (e *execProcess) Wait() {
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<-e.waitBlock
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}
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func (e *execProcess) ID() string {
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return e.id
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}
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func (e *execProcess) Pid() int {
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e.mu.Lock()
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defer e.mu.Unlock()
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return e.pid
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}
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func (e *execProcess) ExitStatus() int {
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e.mu.Lock()
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defer e.mu.Unlock()
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return e.status
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}
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func (e *execProcess) ExitedAt() time.Time {
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e.mu.Lock()
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defer e.mu.Unlock()
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return e.exited
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}
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func (e *execProcess) setExited(status int) {
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e.status = status
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e.exited = time.Now()
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e.parent.Platform.ShutdownConsole(context.Background(), e.console)
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close(e.waitBlock)
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}
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func (e *execProcess) delete(ctx context.Context) error {
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e.wg.Wait()
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if e.io != nil {
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for _, c := range e.closers {
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c.Close()
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}
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e.io.Close()
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}
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pidfile := filepath.Join(e.path, fmt.Sprintf("%s.pid", e.id))
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// silently ignore error
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os.Remove(pidfile)
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internalPidfile := filepath.Join(e.path, fmt.Sprintf("%s-internal.pid", e.id))
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// silently ignore error
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os.Remove(internalPidfile)
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return nil
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}
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func (e *execProcess) resize(ws console.WinSize) error {
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if e.console == nil {
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return nil
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}
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return e.console.Resize(ws)
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}
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func (e *execProcess) kill(ctx context.Context, sig uint32, _ bool) error {
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internalPid := e.internalPid
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if internalPid != 0 {
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if err := e.parent.runtime.Kill(ctx, e.parent.id, int(sig), &runsc.KillOpts{
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Pid: internalPid,
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}); err != nil {
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// If this returns error, consider the process has already stopped.
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// TODO: Fix after signal handling is fixed.
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return errors.Wrapf(errdefs.ErrNotFound, err.Error())
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}
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}
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return nil
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}
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func (e *execProcess) Stdin() io.Closer {
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return e.stdin
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}
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func (e *execProcess) Stdio() proc.Stdio {
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return e.stdio
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}
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func (e *execProcess) start(ctx context.Context) (err error) {
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var (
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socket *runc.Socket
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pidfile = filepath.Join(e.path, fmt.Sprintf("%s.pid", e.id))
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internalPidfile = filepath.Join(e.path, fmt.Sprintf("%s-internal.pid", e.id))
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)
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if e.stdio.Terminal {
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if socket, err = runc.NewTempConsoleSocket(); err != nil {
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return errors.Wrap(err, "failed to create runc console socket")
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}
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defer socket.Close()
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} else if e.stdio.IsNull() {
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if e.io, err = runc.NewNullIO(); err != nil {
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return errors.Wrap(err, "creating new NULL IO")
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}
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} else {
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if e.io, err = runc.NewPipeIO(e.parent.IoUID, e.parent.IoGID, withConditionalIO(e.stdio)); err != nil {
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return errors.Wrap(err, "failed to create runc io pipes")
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}
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}
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opts := &runsc.ExecOpts{
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PidFile: pidfile,
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InternalPidFile: internalPidfile,
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IO: e.io,
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Detach: true,
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}
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if socket != nil {
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opts.ConsoleSocket = socket
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}
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eventCh := shim.Default.Subscribe()
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defer func() {
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// Unsubscribe if an error is returned.
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if err != nil {
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shim.Default.Unsubscribe(eventCh)
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}
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}()
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if err := e.parent.runtime.Exec(ctx, e.parent.id, e.spec, opts); err != nil {
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close(e.waitBlock)
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return e.parent.runtimeError(err, "OCI runtime exec failed")
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}
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if e.stdio.Stdin != "" {
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sc, err := fifo.OpenFifo(ctx, e.stdio.Stdin, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
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if err != nil {
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return errors.Wrapf(err, "failed to open stdin fifo %s", e.stdio.Stdin)
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}
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e.closers = append(e.closers, sc)
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e.stdin = sc
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}
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var copyWaitGroup sync.WaitGroup
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ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
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defer func() {
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if err != nil {
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cancel()
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}
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}()
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if socket != nil {
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console, err := socket.ReceiveMaster()
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if err != nil {
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return errors.Wrap(err, "failed to retrieve console master")
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}
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if e.console, err = e.parent.Platform.CopyConsole(ctx, console, e.stdio.Stdin, e.stdio.Stdout, e.stdio.Stderr, &e.wg, ©WaitGroup); err != nil {
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return errors.Wrap(err, "failed to start console copy")
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}
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} else if !e.stdio.IsNull() {
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if err := copyPipes(ctx, e.io, e.stdio.Stdin, e.stdio.Stdout, e.stdio.Stderr, &e.wg, ©WaitGroup); err != nil {
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return errors.Wrap(err, "failed to start io pipe copy")
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}
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}
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copyWaitGroup.Wait()
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pid, err := runc.ReadPidFile(opts.PidFile)
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if err != nil {
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return errors.Wrap(err, "failed to retrieve OCI runtime exec pid")
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}
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e.pid = pid
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internalPid, err := runc.ReadPidFile(opts.InternalPidFile)
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if err != nil {
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return errors.Wrap(err, "failed to retrieve OCI runtime exec internal pid")
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}
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e.internalPid = internalPid
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go func() {
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defer shim.Default.Unsubscribe(eventCh)
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for event := range eventCh {
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if event.Pid == e.pid {
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ExitCh <- Exit{
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Timestamp: event.Timestamp,
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ID: e.id,
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Status: event.Status,
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}
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break
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}
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}
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}()
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return nil
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}
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func (e *execProcess) Status(ctx context.Context) (string, error) {
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e.mu.Lock()
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defer e.mu.Unlock()
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// if we don't have a pid then the exec process has just been created
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if e.pid == 0 {
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return "created", nil
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}
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// if we have a pid and it can be signaled, the process is running
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// TODO(random-liu): Use `runsc kill --pid`.
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if err := unix.Kill(e.pid, 0); err == nil {
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return "running", nil
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}
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// else if we have a pid but it can nolonger be signaled, it has stopped
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return "stopped", nil
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}
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