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Integrate process changes in container.go

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Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Michael Crosby 2014-01-09 16:03:22 -08:00
parent 203b69c8c9
commit f2680e5a5b
4 changed files with 78 additions and 135 deletions
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156
container.go
View file

@ -1,11 +1,11 @@
package docker
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/dotcloud/docker/archive"
"github.com/dotcloud/docker/execdriver"
"github.com/dotcloud/docker/graphdriver"
"github.com/dotcloud/docker/mount"
"github.com/dotcloud/docker/pkg/term"
@ -16,7 +16,6 @@ import (
"log"
"net"
"os"
"os/exec"
"path"
"strconv"
"strings"
@ -55,7 +54,7 @@ type Container struct {
Name string
Driver string
cmd *exec.Cmd
process *execdriver.Process
stdout *utils.WriteBroadcaster
stderr *utils.WriteBroadcaster
stdin io.ReadCloser
@ -235,10 +234,6 @@ func (container *Container) Inject(file io.Reader, pth string) error {
return nil
}
func (container *Container) Cmd() *exec.Cmd {
return container.cmd
}
func (container *Container) When() time.Time {
return container.Created
}
@ -320,8 +315,8 @@ func (container *Container) startPty() error {
return err
}
container.ptyMaster = ptyMaster
container.cmd.Stdout = ptySlave
container.cmd.Stderr = ptySlave
container.process.Stdout = ptySlave
container.process.Stderr = ptySlave
// Copy the PTYs to our broadcasters
go func() {
@ -333,8 +328,7 @@ func (container *Container) startPty() error {
// stdin
if container.Config.OpenStdin {
container.cmd.Stdin = ptySlave
container.cmd.SysProcAttr.Setctty = true
container.process.Stdin = ptySlave
go func() {
defer container.stdin.Close()
utils.Debugf("startPty: begin of stdin pipe")
@ -342,7 +336,7 @@ func (container *Container) startPty() error {
utils.Debugf("startPty: end of stdin pipe")
}()
}
if err := container.cmd.Start(); err != nil {
if err := container.runtime.execDriver.Start(container.process); err != nil {
return err
}
ptySlave.Close()
@ -350,10 +344,10 @@ func (container *Container) startPty() error {
}
func (container *Container) start() error {
container.cmd.Stdout = container.stdout
container.cmd.Stderr = container.stderr
container.process.Stdout = container.stdout
container.process.Stderr = container.stderr
if container.Config.OpenStdin {
stdin, err := container.cmd.StdinPipe()
stdin, err := container.process.StdinPipe()
if err != nil {
return err
}
@ -364,7 +358,7 @@ func (container *Container) start() error {
utils.Debugf("start: end of stdin pipe")
}()
}
return container.cmd.Start()
return container.runtime.execDriver.Start(container.process)
}
func (container *Container) Attach(stdin io.ReadCloser, stdinCloser io.Closer, stdout io.Writer, stderr io.Writer) chan error {
@ -653,8 +647,9 @@ func (container *Container) Start() (err error) {
return err
}
var workingDir string
if container.Config.WorkingDir != "" {
workingDir := path.Clean(container.Config.WorkingDir)
workingDir = path.Clean(container.Config.WorkingDir)
utils.Debugf("[working dir] working dir is %s", workingDir)
if err := os.MkdirAll(path.Join(container.RootfsPath(), workingDir), 0755); err != nil {
@ -713,7 +708,6 @@ func (container *Container) Start() (err error) {
}
// Mount user specified volumes
for r, v := range container.Volumes {
mountAs := "ro"
if container.VolumesRW[r] {
@ -725,7 +719,30 @@ func (container *Container) Start() (err error) {
}
}
container.cmd = exec.Command(params[0], params[1:]...)
var en *execdriver.Network
if !container.runtime.networkManager.disabled {
network := container.NetworkSettings
en = &execdriver.Network{
Gateway: network.Gateway,
IPAddress: network.IPAddress,
IPPrefixLen: network.IPPrefixLen,
Mtu: container.runtime.config.Mtu,
}
}
container.process = &execdriver.Process{
Name: container.ID,
Privileged: container.hostConfig.Privileged,
Dir: root,
InitPath: "/.dockerinit",
Entrypoint: container.Path,
Args: container.Args,
WorkingDir: workingDir,
ConfigPath: container.lxcConfigPath(),
Network: en,
Tty: container.Config.Tty,
User: container.Config.User,
}
// Setup logging of stdout and stderr to disk
if err := container.runtime.LogToDisk(container.stdout, container.logPath("json"), "stdout"); err != nil {
@ -735,8 +752,6 @@ func (container *Container) Start() (err error) {
return err
}
container.cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
if container.Config.Tty {
err = container.startPty()
} else {
@ -745,48 +760,13 @@ func (container *Container) Start() (err error) {
if err != nil {
return err
}
// FIXME: save state on disk *first*, then converge
// this way disk state is used as a journal, eg. we can restore after crash etc.
container.State.SetRunning(container.cmd.Process.Pid)
// Init the lock
container.waitLock = make(chan struct{})
container.ToDisk()
go container.monitor()
defer utils.Debugf("Container running: %v", container.State.IsRunning())
// We wait for the container to be fully running.
// Timeout after 5 seconds. In case of broken pipe, just retry.
// Note: The container can run and finish correctly before
// the end of this loop
for now := time.Now(); time.Since(now) < 5*time.Second; {
// If the container dies while waiting for it, just return
if !container.State.IsRunning() {
return nil
}
output, err := exec.Command("lxc-info", "-s", "-n", container.ID).CombinedOutput()
if err != nil {
utils.Debugf("Error with lxc-info: %s (%s)", err, output)
output, err = exec.Command("lxc-info", "-s", "-n", container.ID).CombinedOutput()
if err != nil {
utils.Debugf("Second Error with lxc-info: %s (%s)", err, output)
return err
}
}
if strings.Contains(string(output), "RUNNING") {
return nil
}
utils.Debugf("Waiting for the container to start (running: %v): %s", container.State.IsRunning(), bytes.TrimSpace(output))
time.Sleep(50 * time.Millisecond)
}
if container.State.IsRunning() {
return ErrContainerStartTimeout
}
return ErrContainerStart
return nil
}
func (container *Container) getBindMap() (map[string]BindMap, error) {
@ -1159,47 +1139,18 @@ func (container *Container) releaseNetwork() {
container.NetworkSettings = &NetworkSettings{}
}
// FIXME: replace this with a control socket within dockerinit
func (container *Container) waitLxc() error {
for {
output, err := exec.Command("lxc-info", "-n", container.ID).CombinedOutput()
if err != nil {
return err
}
if !strings.Contains(string(output), "RUNNING") {
return nil
}
time.Sleep(500 * time.Millisecond)
}
}
func (container *Container) monitor() {
// Wait for the program to exit
// If the command does not exist, try to wait via lxc
// (This probably happens only for ghost containers, i.e. containers that were running when Docker started)
if container.cmd == nil {
utils.Debugf("monitor: waiting for container %s using waitLxc", container.ID)
if err := container.waitLxc(); err != nil {
utils.Errorf("monitor: while waiting for container %s, waitLxc had a problem: %s", container.ID, err)
}
} else {
utils.Debugf("monitor: waiting for container %s using cmd.Wait", container.ID)
if err := container.cmd.Wait(); err != nil {
// Since non-zero exit status and signal terminations will cause err to be non-nil,
// we have to actually discard it. Still, log it anyway, just in case.
utils.Debugf("monitor: cmd.Wait reported exit status %s for container %s", err, container.ID)
}
if container.process == nil {
panic("Container process is nil")
}
utils.Debugf("monitor: container %s finished", container.ID)
exitCode := -1
if container.cmd != nil {
exitCode = container.cmd.ProcessState.Sys().(syscall.WaitStatus).ExitStatus()
}
if container.runtime != nil && container.runtime.srv != nil {
container.runtime.srv.LogEvent("die", container.ID, container.runtime.repositories.ImageName(container.Image))
if err := container.runtime.execDriver.Wait(container.process, time.Duration(0)); err != nil {
// Since non-zero exit status and signal terminations will cause err to be non-nil,
// we have to actually discard it. Still, log it anyway, just in case.
utils.Debugf("monitor: cmd.Wait reported exit status %s for container %s", err, container.ID)
if container.runtime != nil && container.runtime.srv != nil {
container.runtime.srv.LogEvent("die", container.ID, container.runtime.repositories.ImageName(container.Image))
}
}
// Cleanup
@ -1210,9 +1161,6 @@ func (container *Container) monitor() {
container.stdin, container.stdinPipe = io.Pipe()
}
// Report status back
container.State.SetStopped(exitCode)
// Release the lock
close(container.waitLock)
@ -1267,13 +1215,7 @@ func (container *Container) kill(sig int) error {
if !container.State.IsRunning() {
return nil
}
if output, err := exec.Command("lxc-kill", "-n", container.ID, strconv.Itoa(sig)).CombinedOutput(); err != nil {
log.Printf("error killing container %s (%s, %s)", utils.TruncateID(container.ID), output, err)
return err
}
return nil
return container.runtime.execDriver.Kill(container.process, sig)
}
func (container *Container) Kill() error {
@ -1288,11 +1230,11 @@ func (container *Container) Kill() error {
// 2. Wait for the process to die, in last resort, try to kill the process directly
if err := container.WaitTimeout(10 * time.Second); err != nil {
if container.cmd == nil {
if container.process == nil {
return fmt.Errorf("lxc-kill failed, impossible to kill the container %s", utils.TruncateID(container.ID))
}
log.Printf("Container %s failed to exit within 10 seconds of lxc-kill %s - trying direct SIGKILL", "SIGKILL", utils.TruncateID(container.ID))
if err := container.cmd.Process.Kill(); err != nil {
if err := container.runtime.execDriver.Kill(container.process, 9); err != nil {
return err
}
}

32
execdriver/driver.go
View file

@ -3,7 +3,6 @@ package execdriver
import (
"errors"
"io"
"net"
"os/exec"
"sync"
"syscall"
@ -24,7 +23,7 @@ type Driver interface {
// Network settings of the container
type Network struct {
Gateway string
IPAddress net.IPAddr
IPAddress string
IPPrefixLen int
Mtu int
}
@ -67,20 +66,21 @@ func (s *State) SetStopped(exitCode int) error {
type Process struct {
State State
Name string // unique name for the conatienr
Privileged bool
User string
Dir string // root fs of the container
InitPath string // dockerinit
Entrypoint string
Args []string
Environment map[string]string
WorkingDir string
ConfigPath string
Network *Network // if network is nil then networking is disabled
Stdin io.Reader
Stdout io.Writer
Stderr io.Writer
Name string // unique name for the conatienr
Privileged bool
User string
Dir string // root fs of the container
InitPath string // dockerinit
Entrypoint string
Args []string
// Environment map[string]string // we don't use this right now because we use an env file
WorkingDir string
ConfigPath string
Tty bool
Network *Network // if network is nil then networking is disabled
Stdin io.Reader
Stdout io.Writer
Stderr io.Writer
cmd *exec.Cmd
}

16
execdriver/lxc/driver.go
View file

@ -42,13 +42,6 @@ func (d *driver) Start(c *execdriver.Process) error {
return nil
}
/*
configPath, err := d.generateConfig(c)
if err != nil {
return err
}
*/
params := []string{
startPath,
"-n", c.Name,
@ -82,6 +75,7 @@ func (d *driver) Start(c *execdriver.Process) error {
cmd := exec.Command(params[0], params[1:]...)
cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
cmd.SysProcAttr.Setctty = true
if err := c.SetCmd(cmd); err != nil {
return err
@ -111,10 +105,7 @@ func (d *driver) Stop(c *execdriver.Process) error {
}
}
exitCode := c.GetExitCode()
if err := c.State.SetStopped(exitCode); err != nil {
return err
}
return nil
return c.State.SetStopped(exitCode)
}
func (d *driver) Kill(c *execdriver.Process, sig int) error {
@ -155,7 +146,8 @@ begin:
return err
}
}
return nil
exitCode := c.GetExitCode()
return c.State.SetStopped(exitCode)
}
func (d *driver) kill(c *execdriver.Process, sig int) error {

9
runtime.go
View file

@ -5,6 +5,8 @@ import (
"fmt"
"github.com/dotcloud/docker/archive"
"github.com/dotcloud/docker/cgroups"
"github.com/dotcloud/docker/execdriver"
"github.com/dotcloud/docker/execdriver/lxc"
"github.com/dotcloud/docker/graphdriver"
"github.com/dotcloud/docker/graphdriver/aufs"
_ "github.com/dotcloud/docker/graphdriver/devmapper"
@ -56,6 +58,7 @@ type Runtime struct {
config *DaemonConfig
containerGraph *graphdb.Database
driver graphdriver.Driver
execDriver execdriver.Driver
}
// List returns an array of all containers registered in the runtime.
@ -735,6 +738,11 @@ func NewRuntimeFromDirectory(config *DaemonConfig) (*Runtime, error) {
sysInitPath = localCopy
}
ed, err := lxc.NewDriver("")
if err != nil {
return nil, err
}
runtime := &Runtime{
repository: runtimeRepo,
containers: list.New(),
@ -748,6 +756,7 @@ func NewRuntimeFromDirectory(config *DaemonConfig) (*Runtime, error) {
containerGraph: graph,
driver: driver,
sysInitPath: sysInitPath,
execDriver: ed,
}
if err := runtime.restore(); err != nil {