1
0
Fork 0
mirror of https://github.com/moby/moby.git synced 2022-11-09 12:21:53 -05:00
moby--moby/libcontainerd/container_windows.go
John Howard 94d70d8355 Windows libcontainerd implementation
Signed-off-by: John Howard <jhoward@microsoft.com>
Signed-off-by: John Starks <jostarks@microsoft.com>
Signed-off-by: Darren Stahl <darst@microsoft.com>
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
2016-03-18 13:38:41 -07:00

204 lines
6.7 KiB
Go

package libcontainerd
import (
"io"
"strings"
"syscall"
"github.com/Microsoft/hcsshim"
"github.com/Sirupsen/logrus"
)
type container struct {
containerCommon
// Platform specific fields are below here. There are none presently on Windows.
options []CreateOption
// The ociSpec is required, as client.Create() needs a spec,
// but can be called from the RestartManager context which does not
// otherwise have access to the Spec
ociSpec Spec
}
func (ctr *container) newProcess(friendlyName string) *process {
return &process{
processCommon: processCommon{
containerID: ctr.containerID,
friendlyName: friendlyName,
client: ctr.client,
},
}
}
func (ctr *container) start() error {
var err error
// Start the container
logrus.Debugln("Starting container ", ctr.containerID)
if err = hcsshim.StartComputeSystem(ctr.containerID); err != nil {
logrus.Errorf("Failed to start compute system: %s", err)
return err
}
createProcessParms := hcsshim.CreateProcessParams{
EmulateConsole: ctr.ociSpec.Process.Terminal,
WorkingDirectory: ctr.ociSpec.Process.Cwd,
ConsoleSize: ctr.ociSpec.Process.InitialConsoleSize,
}
// Configure the environment for the process
createProcessParms.Environment = setupEnvironmentVariables(ctr.ociSpec.Process.Env)
createProcessParms.CommandLine = strings.Join(ctr.ociSpec.Process.Args, " ")
iopipe := &IOPipe{Terminal: ctr.ociSpec.Process.Terminal}
// Start the command running in the container. Note we always tell HCS to
// create stdout as it's required regardless of '-i' or '-t' options, so that
// docker can always grab the output through logs. We also tell HCS to always
// create stdin, even if it's not used - it will be closed shortly. Stderr
// is only created if it we're not -t.
var pid uint32
var stdout, stderr io.ReadCloser
pid, iopipe.Stdin, stdout, stderr, err = hcsshim.CreateProcessInComputeSystem(
ctr.containerID,
true,
true,
!ctr.ociSpec.Process.Terminal,
createProcessParms)
if err != nil {
logrus.Errorf("CreateProcessInComputeSystem() failed %s", err)
// Explicitly terminate the compute system here.
if err2 := hcsshim.TerminateComputeSystem(ctr.containerID, hcsshim.TimeoutInfinite, "CreateProcessInComputeSystem failed"); err2 != nil {
// Ignore this error, there's not a lot we can do except log it
logrus.Warnf("Failed to TerminateComputeSystem after a failed CreateProcessInComputeSystem. Ignoring this.", err2)
} else {
logrus.Debugln("Cleaned up after failed CreateProcessInComputeSystem by calling TerminateComputeSystem")
}
return err
}
// Convert io.ReadClosers to io.Readers
if stdout != nil {
iopipe.Stdout = openReaderFromPipe(stdout)
}
if stderr != nil {
iopipe.Stderr = openReaderFromPipe(stderr)
}
// Save the PID
logrus.Debugf("Process started - PID %d", pid)
ctr.systemPid = uint32(pid)
// Spin up a go routine waiting for exit to handle cleanup
go ctr.waitExit(pid, InitFriendlyName, true)
ctr.client.appendContainer(ctr)
if err := ctr.client.backend.AttachStreams(ctr.containerID, *iopipe); err != nil {
// OK to return the error here, as waitExit will handle tear-down in HCS
return err
}
// Tell the docker engine that the container has started.
si := StateInfo{
State: StateStart,
Pid: ctr.systemPid, // Not sure this is needed? Double-check monitor.go in daemon BUGBUG @jhowardmsft
}
return ctr.client.backend.StateChanged(ctr.containerID, si)
}
// waitExit runs as a goroutine waiting for the process to exit. It's
// equivalent to (in the linux containerd world) where events come in for
// state change notifications from containerd.
func (ctr *container) waitExit(pid uint32, processFriendlyName string, isFirstProcessToStart bool) error {
logrus.Debugln("waitExit on pid", pid)
// Block indefinitely for the process to exit.
exitCode, err := hcsshim.WaitForProcessInComputeSystem(ctr.containerID, pid, hcsshim.TimeoutInfinite)
if err != nil {
if herr, ok := err.(*hcsshim.HcsError); ok && herr.Err != syscall.ERROR_BROKEN_PIPE {
logrus.Warnf("WaitForProcessInComputeSystem failed (container may have been killed): %s", err)
}
// Fall through here, do not return. This ensures we attempt to continue the
// shutdown in HCS nad tell the docker engine that the process/container
// has exited to avoid a container being dropped on the floor.
}
// Assume the container has exited
si := StateInfo{
State: StateExit,
ExitCode: uint32(exitCode),
Pid: pid,
ProcessID: processFriendlyName,
}
// But it could have been an exec'd process which exited
if !isFirstProcessToStart {
si.State = StateExitProcess
}
// If this is the init process, always call into vmcompute.dll to
// shutdown the container after we have completed.
if isFirstProcessToStart {
logrus.Debugf("Shutting down container %s", ctr.containerID)
// Explicit timeout here rather than hcsshim.TimeoutInfinte to avoid a
// (remote) possibility that ShutdownComputeSystem hangs indefinitely.
const shutdownTimeout = 5 * 60 * 1000 // 5 minutes
if err := hcsshim.ShutdownComputeSystem(ctr.containerID, shutdownTimeout, "waitExit"); err != nil {
if herr, ok := err.(*hcsshim.HcsError); !ok ||
(herr.Err != hcsshim.ERROR_SHUTDOWN_IN_PROGRESS &&
herr.Err != ErrorBadPathname &&
herr.Err != syscall.ERROR_PATH_NOT_FOUND) {
logrus.Warnf("Ignoring error from ShutdownComputeSystem %s", err)
}
} else {
logrus.Debugf("Completed shutting down container %s", ctr.containerID)
}
// BUGBUG - Is taking the lock necessary here? Should it just be taken for
// the deleteContainer call, not for the restart logic? @jhowardmsft
ctr.client.lock(ctr.containerID)
defer ctr.client.unlock(ctr.containerID)
if si.State == StateExit && ctr.restartManager != nil {
restart, wait, err := ctr.restartManager.ShouldRestart(uint32(exitCode))
if err != nil {
logrus.Error(err)
} else if restart {
si.State = StateRestart
ctr.restarting = true
go func() {
err := <-wait
ctr.restarting = false
if err != nil {
si.State = StateExit
if err := ctr.client.backend.StateChanged(ctr.containerID, si); err != nil {
logrus.Error(err)
}
logrus.Error(err)
} else {
ctr.client.Create(ctr.containerID, ctr.ociSpec, ctr.options...)
}
}()
}
}
// Remove process from list if we have exited
// We need to do so here in case the Message Handler decides to restart it.
if si.State == StateExit {
ctr.client.deleteContainer(ctr.friendlyName)
}
}
// Call into the backend to notify it of the state change.
logrus.Debugf("waitExit() calling backend.StateChanged %v", si)
if err := ctr.client.backend.StateChanged(ctr.containerID, si); err != nil {
logrus.Error(err)
}
logrus.Debugln("waitExit() completed OK")
return nil
}