enable podman-remote on windows

build a podman-remote binary for windows that allows users to use the
remote client on windows and interact with podman on linux system.

Signed-off-by: baude <bbaude@redhat.com>

1 files changed, 447 insertions, 0 deletions

diff --git a/libpod/oci_linux.go b/libpod/oci_linux.go
index 1f5411c1f..1c1e4a203 100644
--- a/libpod/oci_linux.go
+++ b/libpod/oci_linux.go
@@ -3,6 +3,8 @@
 package libpod
 
 import (
+	"bufio"
+	"bytes"
 	"fmt"
 	"os"
 	"os/exec"
@@ -10,12 +12,17 @@ import (
 	"runtime"
 	"strings"
 	"syscall"
+	"time"
 
 	"github.com/containerd/cgroups"
 	"github.com/containers/libpod/pkg/rootless"
+	"github.com/containers/libpod/pkg/util"
 	"github.com/containers/libpod/utils"
 	pmount "github.com/containers/storage/pkg/mount"
+	"github.com/coreos/go-systemd/activation"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/selinux/go-selinux"
+	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
@@ -179,3 +186,443 @@ func (r *OCIRuntime) conmonPackage() string {
 	}
 	return dpkgVersion(r.conmonPath)
 }
+
+func (r *OCIRuntime) createOCIContainer(ctr *Container, cgroupParent string, restoreOptions *ContainerCheckpointOptions) (err error) {
+	var stderrBuf bytes.Buffer
+
+	runtimeDir, err := util.GetRootlessRuntimeDir()
+	if err != nil {
+		return err
+	}
+
+	parentPipe, childPipe, err := newPipe()
+	if err != nil {
+		return errors.Wrapf(err, "error creating socket pair")
+	}
+
+	childStartPipe, parentStartPipe, err := newPipe()
+	if err != nil {
+		return errors.Wrapf(err, "error creating socket pair for start pipe")
+	}
+
+	defer parentPipe.Close()
+	defer parentStartPipe.Close()
+
+	args := []string{}
+	if r.cgroupManager == SystemdCgroupsManager {
+		args = append(args, "-s")
+	}
+	args = append(args, "-c", ctr.ID())
+	args = append(args, "-u", ctr.ID())
+	args = append(args, "-r", r.path)
+	args = append(args, "-b", ctr.bundlePath())
+	args = append(args, "-p", filepath.Join(ctr.state.RunDir, "pidfile"))
+	args = append(args, "-l", ctr.LogPath())
+	args = append(args, "--exit-dir", r.exitsDir)
+	if ctr.config.ConmonPidFile != "" {
+		args = append(args, "--conmon-pidfile", ctr.config.ConmonPidFile)
+	}
+	if len(ctr.config.ExitCommand) > 0 {
+		args = append(args, "--exit-command", ctr.config.ExitCommand[0])
+		for _, arg := range ctr.config.ExitCommand[1:] {
+			args = append(args, []string{"--exit-command-arg", arg}...)
+		}
+	}
+	args = append(args, "--socket-dir-path", r.socketsDir)
+	if ctr.config.Spec.Process.Terminal {
+		args = append(args, "-t")
+	} else if ctr.config.Stdin {
+		args = append(args, "-i")
+	}
+	if r.logSizeMax >= 0 {
+		args = append(args, "--log-size-max", fmt.Sprintf("%v", r.logSizeMax))
+	}
+	if r.noPivot {
+		args = append(args, "--no-pivot")
+	}
+
+	logLevel := logrus.GetLevel()
+	args = append(args, "--log-level", logLevel.String())
+
+	if logLevel == logrus.DebugLevel {
+		logrus.Debugf("%s messages will be logged to syslog", r.conmonPath)
+		args = append(args, "--syslog")
+	}
+
+	if restoreOptions != nil {
+		args = append(args, "--restore", ctr.CheckpointPath())
+		if restoreOptions.TCPEstablished {
+			args = append(args, "--restore-arg", "--tcp-established")
+		}
+	}
+
+	logrus.WithFields(logrus.Fields{
+		"args": args,
+	}).Debugf("running conmon: %s", r.conmonPath)
+
+	cmd := exec.Command(r.conmonPath, args...)
+	cmd.Dir = ctr.bundlePath()
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Setpgid: true,
+	}
+	// TODO this is probably a really bad idea for some uses
+	// Make this configurable
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if ctr.config.Spec.Process.Terminal {
+		cmd.Stderr = &stderrBuf
+	}
+
+	cmd.ExtraFiles = append(cmd.ExtraFiles, childPipe, childStartPipe)
+	// 0, 1 and 2 are stdin, stdout and stderr
+	cmd.Env = append(r.conmonEnv, fmt.Sprintf("_OCI_SYNCPIPE=%d", 3))
+	cmd.Env = append(cmd.Env, fmt.Sprintf("_OCI_STARTPIPE=%d", 4))
+	cmd.Env = append(cmd.Env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir))
+	cmd.Env = append(cmd.Env, fmt.Sprintf("_CONTAINERS_USERNS_CONFIGURED=%s", os.Getenv("_CONTAINERS_USERNS_CONFIGURED")))
+	cmd.Env = append(cmd.Env, fmt.Sprintf("_CONTAINERS_ROOTLESS_UID=%s", os.Getenv("_CONTAINERS_ROOTLESS_UID")))
+	cmd.Env = append(cmd.Env, fmt.Sprintf("HOME=%s", os.Getenv("HOME")))
+
+	if r.reservePorts && !ctr.config.NetMode.IsSlirp4netns() {
+		ports, err := bindPorts(ctr.config.PortMappings)
+		if err != nil {
+			return err
+		}
+
+		// Leak the port we bound in the conmon process.  These fd's won't be used
+		// by the container and conmon will keep the ports busy so that another
+		// process cannot use them.
+		cmd.ExtraFiles = append(cmd.ExtraFiles, ports...)
+	}
+
+	if ctr.config.NetMode.IsSlirp4netns() {
+		ctr.rootlessSlirpSyncR, ctr.rootlessSlirpSyncW, err = os.Pipe()
+		if err != nil {
+			return errors.Wrapf(err, "failed to create rootless network sync pipe")
+		}
+		// Leak one end in conmon, the other one will be leaked into slirp4netns
+		cmd.ExtraFiles = append(cmd.ExtraFiles, ctr.rootlessSlirpSyncW)
+	}
+
+	if notify, ok := os.LookupEnv("NOTIFY_SOCKET"); ok {
+		cmd.Env = append(cmd.Env, fmt.Sprintf("NOTIFY_SOCKET=%s", notify))
+	}
+	if listenfds, ok := os.LookupEnv("LISTEN_FDS"); ok {
+		cmd.Env = append(cmd.Env, fmt.Sprintf("LISTEN_FDS=%s", listenfds), "LISTEN_PID=1")
+		fds := activation.Files(false)
+		cmd.ExtraFiles = append(cmd.ExtraFiles, fds...)
+	}
+	if selinux.GetEnabled() {
+		// Set the label of the conmon process to be level :s0
+		// This will allow the container processes to talk to fifo-files
+		// passed into the container by conmon
+		var (
+			plabel string
+			con    selinux.Context
+		)
+		plabel, err = selinux.CurrentLabel()
+		if err != nil {
+			childPipe.Close()
+			return errors.Wrapf(err, "Failed to get current SELinux label")
+		}
+
+		con, err = selinux.NewContext(plabel)
+		if err != nil {
+			return errors.Wrapf(err, "Failed to get new context from SELinux label")
+		}
+
+		runtime.LockOSThread()
+		if con["level"] != "s0" && con["level"] != "" {
+			con["level"] = "s0"
+			if err = label.SetProcessLabel(con.Get()); err != nil {
+				runtime.UnlockOSThread()
+				return err
+			}
+		}
+		err = cmd.Start()
+		// Ignore error returned from SetProcessLabel("") call,
+		// can't recover.
+		label.SetProcessLabel("")
+		runtime.UnlockOSThread()
+	} else {
+		err = cmd.Start()
+	}
+	if err != nil {
+		childPipe.Close()
+		return err
+	}
+	defer cmd.Wait()
+
+	// We don't need childPipe on the parent side
+	childPipe.Close()
+	childStartPipe.Close()
+
+	// Move conmon to specified cgroup
+	if err := r.moveConmonToCgroup(ctr, cgroupParent, cmd); err != nil {
+		return err
+	}
+
+	/* We set the cgroup, now the child can start creating children */
+	someData := []byte{0}
+	_, err = parentStartPipe.Write(someData)
+	if err != nil {
+		return err
+	}
+
+	/* Wait for initial setup and fork, and reap child */
+	err = cmd.Wait()
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		if err != nil {
+			if err2 := r.deleteContainer(ctr); err2 != nil {
+				logrus.Errorf("Error removing container %s from runtime after creation failed", ctr.ID())
+			}
+		}
+	}()
+
+	// Wait to get container pid from conmon
+	type syncStruct struct {
+		si  *syncInfo
+		err error
+	}
+	ch := make(chan syncStruct)
+	go func() {
+		var si *syncInfo
+		rdr := bufio.NewReader(parentPipe)
+		b, err := rdr.ReadBytes('\n')
+		if err != nil {
+			ch <- syncStruct{err: err}
+		}
+		if err := json.Unmarshal(b, &si); err != nil {
+			ch <- syncStruct{err: err}
+			return
+		}
+		ch <- syncStruct{si: si}
+	}()
+
+	select {
+	case ss := <-ch:
+		if ss.err != nil {
+			return errors.Wrapf(ss.err, "error reading container (probably exited) json message")
+		}
+		logrus.Debugf("Received container pid: %d", ss.si.Pid)
+		if ss.si.Pid == -1 {
+			if ss.si.Message != "" {
+				return errors.Wrapf(ErrInternal, "container create failed: %s", ss.si.Message)
+			}
+			return errors.Wrapf(ErrInternal, "container create failed")
+		}
+		ctr.state.PID = ss.si.Pid
+	case <-time.After(ContainerCreateTimeout):
+		return errors.Wrapf(ErrInternal, "container creation timeout")
+	}
+	return nil
+}
+
+// Wait for a container which has been sent a signal to stop
+func waitContainerStop(ctr *Container, timeout time.Duration) error {
+	done := make(chan struct{})
+	chControl := make(chan struct{})
+	go func() {
+		for {
+			select {
+			case <-chControl:
+				return
+			default:
+				// Check if the process is still around
+				err := unix.Kill(ctr.state.PID, 0)
+				if err == unix.ESRCH {
+					close(done)
+					return
+				}
+				time.Sleep(100 * time.Millisecond)
+			}
+		}
+	}()
+	select {
+	case <-done:
+		return nil
+	case <-time.After(timeout):
+		close(chControl)
+		logrus.Debugf("container %s did not die within timeout %d", ctr.ID(), timeout)
+		return errors.Errorf("container %s did not die within timeout", ctr.ID())
+	}
+}
+
+// Wait for a set of given PIDs to stop
+func waitPidsStop(pids []int, timeout time.Duration) error {
+	done := make(chan struct{})
+	chControl := make(chan struct{})
+	go func() {
+		for {
+			select {
+			case <-chControl:
+				return
+			default:
+				allClosed := true
+				for _, pid := range pids {
+					if err := unix.Kill(pid, 0); err != unix.ESRCH {
+						allClosed = false
+						break
+					}
+				}
+				if allClosed {
+					close(done)
+					return
+				}
+				time.Sleep(100 * time.Millisecond)
+			}
+		}
+	}()
+	select {
+	case <-done:
+		return nil
+	case <-time.After(timeout):
+		close(chControl)
+		return errors.Errorf("given PIDs did not die within timeout")
+	}
+}
+
+// stopContainer stops a container, first using its given stop signal (or
+// SIGTERM if no signal was specified), then using SIGKILL
+// Timeout is given in seconds. If timeout is 0, the container will be
+// immediately kill with SIGKILL
+// Does not set finished time for container, assumes you will run updateStatus
+// after to pull the exit code
+func (r *OCIRuntime) stopContainer(ctr *Container, timeout uint) error {
+	logrus.Debugf("Stopping container %s (PID %d)", ctr.ID(), ctr.state.PID)
+
+	// Ping the container to see if it's alive
+	// If it's not, it's already stopped, return
+	err := unix.Kill(ctr.state.PID, 0)
+	if err == unix.ESRCH {
+		return nil
+	}
+
+	stopSignal := ctr.config.StopSignal
+	if stopSignal == 0 {
+		stopSignal = uint(syscall.SIGTERM)
+	}
+
+	if timeout > 0 {
+		if err := r.killContainer(ctr, stopSignal); err != nil {
+			// Is the container gone?
+			// If so, it probably died between the first check and
+			// our sending the signal
+			// The container is stopped, so exit cleanly
+			err := unix.Kill(ctr.state.PID, 0)
+			if err == unix.ESRCH {
+				return nil
+			}
+
+			return err
+		}
+
+		if err := waitContainerStop(ctr, time.Duration(timeout)*time.Second); err != nil {
+			logrus.Warnf("Timed out stopping container %s, resorting to SIGKILL", ctr.ID())
+		} else {
+			// No error, the container is dead
+			return nil
+		}
+	}
+
+	var args []string
+	if rootless.IsRootless() {
+		// we don't use --all for rootless containers as the OCI runtime might use
+		// the cgroups to determine the PIDs, but for rootless containers there is
+		// not any.
+		args = []string{"kill", ctr.ID(), "KILL"}
+	} else {
+		args = []string{"kill", "--all", ctr.ID(), "KILL"}
+	}
+
+	runtimeDir, err := util.GetRootlessRuntimeDir()
+	if err != nil {
+		return err
+	}
+	env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
+	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, args...); err != nil {
+		// Again, check if the container is gone. If it is, exit cleanly.
+		err := unix.Kill(ctr.state.PID, 0)
+		if err == unix.ESRCH {
+			return nil
+		}
+
+		return errors.Wrapf(err, "error sending SIGKILL to container %s", ctr.ID())
+	}
+
+	// Give runtime a few seconds to make it happen
+	if err := waitContainerStop(ctr, killContainerTimeout); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// execStopContainer stops all active exec sessions in a container
+// It will also stop all other processes in the container. It is only intended
+// to be used to assist in cleanup when removing a container.
+// SIGTERM is used by default to stop processes. If SIGTERM fails, SIGKILL will be used.
+func (r *OCIRuntime) execStopContainer(ctr *Container, timeout uint) error {
+	// Do we have active exec sessions?
+	if len(ctr.state.ExecSessions) == 0 {
+		return nil
+	}
+
+	// Get a list of active exec sessions
+	execSessions := []int{}
+	for _, session := range ctr.state.ExecSessions {
+		pid := session.PID
+		// Ping the PID with signal 0 to see if it still exists
+		if err := unix.Kill(pid, 0); err == unix.ESRCH {
+			continue
+		}
+
+		execSessions = append(execSessions, pid)
+	}
+
+	// All the sessions may be dead
+	// If they are, just return
+	if len(execSessions) == 0 {
+		return nil
+	}
+	runtimeDir, err := util.GetRootlessRuntimeDir()
+	if err != nil {
+		return err
+	}
+	env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
+
+	// If timeout is 0, just use SIGKILL
+	if timeout > 0 {
+		// Stop using SIGTERM by default
+		// Use SIGSTOP after a timeout
+		logrus.Debugf("Killing all processes in container %s with SIGTERM", ctr.ID())
+		if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "kill", "--all", ctr.ID(), "TERM"); err != nil {
+			return errors.Wrapf(err, "error sending SIGTERM to container %s processes", ctr.ID())
+		}
+
+		// Wait for all processes to stop
+		if err := waitPidsStop(execSessions, time.Duration(timeout)*time.Second); err != nil {
+			logrus.Warnf("Timed out stopping container %s exec sessions", ctr.ID())
+		} else {
+			// No error, all exec sessions are dead
+			return nil
+		}
+	}
+
+	// Send SIGKILL
+	logrus.Debugf("Killing all processes in container %s with SIGKILL", ctr.ID())
+	if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "kill", "--all", ctr.ID(), "KILL"); err != nil {
+		return errors.Wrapf(err, "error sending SIGKILL to container %s processes", ctr.ID())
+	}
+
+	// Give the processes a few seconds to go down
+	if err := waitPidsStop(execSessions, killContainerTimeout); err != nil {
+		return errors.Wrapf(err, "failed to kill container %s exec sessions", ctr.ID())
+	}
+
+	return nil
+}