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exec.go
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exec.go
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// +build !windows
package shim
import (
"context"
"encoding/json"
"fmt"
"io"
"path/filepath"
"sync"
"syscall"
"time"
"golang.org/x/sys/unix"
"github.com/containerd/console"
"github.com/containerd/containerd/identifiers"
shimapi "github.com/containerd/containerd/linux/shim/v1"
"github.com/containerd/fifo"
runc "github.com/containerd/go-runc"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
type execProcess struct {
wg sync.WaitGroup
processState
mu sync.Mutex
id string
console console.Console
io runc.IO
status int
exited time.Time
pid int
closers []io.Closer
stdin io.Closer
stdio stdio
path string
spec specs.Process
parent *initProcess
waitBlock chan struct{}
}
func newExecProcess(context context.Context, path string, r *shimapi.ExecProcessRequest, parent *initProcess, id string) (process, error) {
if err := identifiers.Validate(id); err != nil {
return nil, errors.Wrapf(err, "invalid exec id")
}
// process exec request
var spec specs.Process
if err := json.Unmarshal(r.Spec.Value, &spec); err != nil {
return nil, err
}
spec.Terminal = r.Terminal
e := &execProcess{
id: id,
path: path,
parent: parent,
spec: spec,
stdio: stdio{
stdin: r.Stdin,
stdout: r.Stdout,
stderr: r.Stderr,
terminal: r.Terminal,
},
waitBlock: make(chan struct{}),
}
e.processState = &execCreatedState{p: e}
return e, nil
}
func (e *execProcess) Wait() {
<-e.waitBlock
}
func (e *execProcess) ID() string {
return e.id
}
func (e *execProcess) Pid() int {
e.mu.Lock()
defer e.mu.Unlock()
return e.pid
}
func (e *execProcess) ExitStatus() int {
e.mu.Lock()
defer e.mu.Unlock()
return e.status
}
func (e *execProcess) ExitedAt() time.Time {
e.mu.Lock()
defer e.mu.Unlock()
return e.exited
}
func (e *execProcess) setExited(status int) {
e.status = status
e.exited = time.Now()
e.parent.platform.shutdownConsole(context.Background(), e.console)
close(e.waitBlock)
}
func (e *execProcess) delete(ctx context.Context) error {
e.wg.Wait()
if e.io != nil {
for _, c := range e.closers {
c.Close()
}
e.io.Close()
}
return nil
}
func (e *execProcess) resize(ws console.WinSize) error {
if e.console == nil {
return nil
}
return e.console.Resize(ws)
}
func (e *execProcess) kill(ctx context.Context, sig uint32, _ bool) error {
pid := e.pid
if pid != 0 {
if err := unix.Kill(pid, syscall.Signal(sig)); err != nil {
return errors.Wrapf(checkKillError(err), "exec kill error")
}
}
return nil
}
func (e *execProcess) Stdin() io.Closer {
return e.stdin
}
func (e *execProcess) Stdio() stdio {
return e.stdio
}
func (e *execProcess) start(ctx context.Context) (err error) {
var (
socket *runc.Socket
pidfile = filepath.Join(e.path, fmt.Sprintf("%s.pid", e.id))
)
if e.stdio.terminal {
if socket, err = runc.NewTempConsoleSocket(); err != nil {
return errors.Wrap(err, "failed to create runc console socket")
}
defer socket.Close()
} else if e.stdio.isNull() {
if e.io, err = runc.NewNullIO(); err != nil {
return errors.Wrap(err, "creating new NULL IO")
}
} else {
if e.io, err = runc.NewPipeIO(e.parent.IoUID, e.parent.IoGID); err != nil {
return errors.Wrap(err, "failed to create runc io pipes")
}
}
opts := &runc.ExecOpts{
PidFile: pidfile,
IO: e.io,
Detach: true,
}
if socket != nil {
opts.ConsoleSocket = socket
}
if err := e.parent.runtime.Exec(ctx, e.parent.id, e.spec, opts); err != nil {
return e.parent.runtimeError(err, "OCI runtime exec failed")
}
if e.stdio.stdin != "" {
sc, err := fifo.OpenFifo(ctx, e.stdio.stdin, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
if err != nil {
return errors.Wrapf(err, "failed to open stdin fifo %s", e.stdio.stdin)
}
e.closers = append(e.closers, sc)
e.stdin = sc
}
var copyWaitGroup sync.WaitGroup
if socket != nil {
console, err := socket.ReceiveMaster()
if err != nil {
return errors.Wrap(err, "failed to retrieve console master")
}
if e.console, err = e.parent.platform.copyConsole(ctx, console, e.stdio.stdin, e.stdio.stdout, e.stdio.stderr, &e.wg, ©WaitGroup); err != nil {
return errors.Wrap(err, "failed to start console copy")
}
} else if !e.stdio.isNull() {
if err := copyPipes(ctx, e.io, e.stdio.stdin, e.stdio.stdout, e.stdio.stderr, &e.wg, ©WaitGroup); err != nil {
return errors.Wrap(err, "failed to start io pipe copy")
}
}
copyWaitGroup.Wait()
pid, err := runc.ReadPidFile(opts.PidFile)
if err != nil {
return errors.Wrap(err, "failed to retrieve OCI runtime exec pid")
}
e.pid = pid
return nil
}
func (e *execProcess) Status(ctx context.Context) (string, error) {
s, err := e.parent.Status(ctx)
if err != nil {
return "", err
}
// if the container as a whole is in the pausing/paused state, so are all
// other processes inside the container, use container state here
switch s {
case "paused", "pausing":
return s, nil
}
e.mu.Lock()
defer e.mu.Unlock()
// if we don't have a pid then the exec process has just been created
if e.pid == 0 {
return "created", nil
}
// if we have a pid and it can be signaled, the process is running
if err := unix.Kill(e.pid, 0); err == nil {
return "running", nil
}
// else if we have a pid but it can nolonger be signaled, it has stopped
return "stopped", nil
}