summaryrefslogtreecommitdiff
path: root/libpod/container.go
diff options
context:
space:
mode:
Diffstat (limited to 'libpod/container.go')
-rw-r--r--libpod/container.go1110
1 files changed, 0 insertions, 1110 deletions
diff --git a/libpod/container.go b/libpod/container.go
index 71de63fd1..2c2377327 100644
--- a/libpod/container.go
+++ b/libpod/container.go
@@ -1,39 +1,18 @@
package libpod
import (
- "encoding/json"
"fmt"
- "io"
- "io/ioutil"
"net"
- "os"
"path/filepath"
- "syscall"
"time"
"github.com/containerd/cgroups"
"github.com/containernetworking/plugins/pkg/ns"
"github.com/containers/storage"
- "github.com/containers/storage/pkg/archive"
"github.com/cri-o/ocicni/pkg/ocicni"
- "github.com/docker/docker/daemon/caps"
- "github.com/docker/docker/pkg/mount"
- "github.com/docker/docker/pkg/namesgenerator"
- "github.com/docker/docker/pkg/stringid"
- "github.com/docker/docker/pkg/term"
- "github.com/mrunalp/fileutils"
spec "github.com/opencontainers/runtime-spec/specs-go"
- "github.com/opencontainers/runtime-tools/generate"
- "github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
- "github.com/projectatomic/libpod/libpod/driver"
- crioAnnotations "github.com/projectatomic/libpod/pkg/annotations"
- "github.com/projectatomic/libpod/pkg/chrootuser"
- "github.com/sirupsen/logrus"
"github.com/ulule/deepcopier"
- "golang.org/x/sys/unix"
- "k8s.io/apimachinery/pkg/util/wait"
- "k8s.io/client-go/tools/remotecommand"
)
// ContainerState represents the current state of a container
@@ -131,7 +110,6 @@ type Container struct {
// TODO fetch IP and Subnet Mask from networks once we have updated OCICNI
// TODO enable pod support
// TODO Add readonly support
-// TODO add SHM size support
// containerRuntimeInfo contains the current state of the container
// It is stored on disk in a tmpfs and recreated on reboot
@@ -380,63 +358,6 @@ func (c *Container) RuntimeName() string {
return c.runtime.ociRuntime.name
}
-// rootFsSize gets the size of the container's root filesystem
-// A container FS is split into two parts. The first is the top layer, a
-// mutable layer, and the rest is the RootFS: the set of immutable layers
-// that make up the image on which the container is based.
-func (c *Container) rootFsSize() (int64, error) {
- container, err := c.runtime.store.Container(c.ID())
- if err != nil {
- return 0, err
- }
-
- // Ignore the size of the top layer. The top layer is a mutable RW layer
- // and is not considered a part of the rootfs
- rwLayer, err := c.runtime.store.Layer(container.LayerID)
- if err != nil {
- return 0, err
- }
- layer, err := c.runtime.store.Layer(rwLayer.Parent)
- if err != nil {
- return 0, err
- }
-
- size := int64(0)
- for layer.Parent != "" {
- layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID)
- if err != nil {
- return size, errors.Wrapf(err, "getting diffsize of layer %q and its parent %q", layer.ID, layer.Parent)
- }
- size += layerSize
- layer, err = c.runtime.store.Layer(layer.Parent)
- if err != nil {
- return 0, err
- }
- }
- // Get the size of the last layer. Has to be outside of the loop
- // because the parent of the last layer is "", andlstore.Get("")
- // will return an error.
- layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID)
- return size + layerSize, err
-}
-
-// rwSize Gets the size of the mutable top layer of the container.
-func (c *Container) rwSize() (int64, error) {
- container, err := c.runtime.store.Container(c.ID())
- if err != nil {
- return 0, err
- }
-
- // Get the size of the top layer by calculating the size of the diff
- // between the layer and its parent. The top layer of a container is
- // the only RW layer, all others are immutable
- layer, err := c.runtime.store.Layer(container.LayerID)
- if err != nil {
- return 0, err
- }
- return c.runtime.store.DiffSize(layer.Parent, layer.ID)
-}
-
// LogPath returns the path to the container's log file
// This file will only be present after Init() is called to create the container
// in runc
@@ -587,1043 +508,12 @@ func (c *Container) NamespacePath(ns LinuxNS) (string, error) {
return fmt.Sprintf("/proc/%d/ns/%s", c.state.PID, ns.String()), nil
}
-// The path to the container's root filesystem - where the OCI spec will be
-// placed, amongst other things
-func (c *Container) bundlePath() string {
- return c.config.StaticDir
-}
-
-// The path to the container's logs file
-func (c *Container) logPath() string {
- return filepath.Join(c.config.StaticDir, "ctr.log")
-}
-
-// Retrieves the path of the container's attach socket
-func (c *Container) attachSocketPath() string {
- return filepath.Join(c.runtime.ociRuntime.socketsDir, c.ID(), "attach")
-}
-
-// Sync this container with on-disk state and runc status
-// Should only be called with container lock held
-// This function should suffice to ensure a container's state is accurate and
-// it is valid for use.
-func (c *Container) syncContainer() error {
- if err := c.runtime.state.UpdateContainer(c); err != nil {
- return err
- }
- // If runc knows about the container, update its status in runc
- // And then save back to disk
- if (c.state.State != ContainerStateUnknown) &&
- (c.state.State != ContainerStateConfigured) {
- oldState := c.state.State
- // TODO: optionally replace this with a stat for the exit file
- if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
- return err
- }
- // Only save back to DB if state changed
- if c.state.State != oldState {
- if err := c.save(); err != nil {
- return err
- }
- }
- }
-
- if !c.valid {
- return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
- }
-
- return nil
-}
-
-// Make a new container
-func newContainer(rspec *spec.Spec, lockDir string) (*Container, error) {
- if rspec == nil {
- return nil, errors.Wrapf(ErrInvalidArg, "must provide a valid runtime spec to create container")
- }
-
- ctr := new(Container)
- ctr.config = new(ContainerConfig)
- ctr.state = new(containerRuntimeInfo)
-
- ctr.config.ID = stringid.GenerateNonCryptoID()
- ctr.config.Name = namesgenerator.GetRandomName(0)
-
- ctr.config.Spec = new(spec.Spec)
- deepcopier.Copy(rspec).To(ctr.config.Spec)
- ctr.config.CreatedTime = time.Now()
-
- ctr.config.ShmSize = DefaultShmSize
- ctr.config.CgroupParent = CgroupParent
-
- // Path our lock file will reside at
- lockPath := filepath.Join(lockDir, ctr.config.ID)
- // Grab a lockfile at the given path
- lock, err := storage.GetLockfile(lockPath)
- if err != nil {
- return nil, errors.Wrapf(err, "error creating lockfile for new container")
- }
- ctr.lock = lock
-
- return ctr, nil
-}
-
-// Create container root filesystem for use
-func (c *Container) setupStorage() error {
- if !c.valid {
- return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
- }
-
- if c.state.State != ContainerStateConfigured {
- return errors.Wrapf(ErrCtrStateInvalid, "container %s must be in Configured state to have storage set up", c.ID())
- }
-
- // Need both an image ID and image name, plus a bool telling us whether to use the image configuration
- if c.config.RootfsImageID == "" || c.config.RootfsImageName == "" {
- return errors.Wrapf(ErrInvalidArg, "must provide image ID and image name to use an image")
- }
-
- containerInfo, err := c.runtime.storageService.CreateContainerStorage(c.runtime.imageContext, c.config.RootfsImageName, c.config.RootfsImageID, c.config.Name, c.config.ID, c.config.MountLabel)
- if err != nil {
- return errors.Wrapf(err, "error creating container storage")
- }
-
- c.config.StaticDir = containerInfo.Dir
- c.state.RunDir = containerInfo.RunDir
-
- artifacts := filepath.Join(c.config.StaticDir, artifactsDir)
- if err := os.MkdirAll(artifacts, 0755); err != nil {
- return errors.Wrapf(err, "error creating artifacts directory %q", artifacts)
- }
-
- return nil
-}
-
-// Tear down a container's storage prior to removal
-func (c *Container) teardownStorage() error {
- if !c.valid {
- return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
- }
-
- if c.state.State == ContainerStateRunning || c.state.State == ContainerStatePaused {
- return errors.Wrapf(ErrCtrStateInvalid, "cannot remove storage for container %s as it is running or paused", c.ID())
- }
-
- artifacts := filepath.Join(c.config.StaticDir, artifactsDir)
- if err := os.RemoveAll(artifacts); err != nil {
- return errors.Wrapf(err, "error removing artifacts %q", artifacts)
- }
-
- if err := c.cleanupStorage(); err != nil {
- return errors.Wrapf(err, "failed to cleanup container %s storage", c.ID())
- }
-
- if err := c.runtime.storageService.DeleteContainer(c.ID()); err != nil {
- return errors.Wrapf(err, "error removing container %s root filesystem", c.ID())
- }
-
- return nil
-}
-
-// Refresh refreshes the container's state after a restart
-func (c *Container) refresh() error {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if !c.valid {
- return errors.Wrapf(ErrCtrRemoved, "container %s is not valid - may have been removed", c.ID())
- }
-
- // We need to get the container's temporary directory from c/storage
- // It was lost in the reboot and must be recreated
- dir, err := c.runtime.storageService.GetRunDir(c.ID())
- if err != nil {
- return errors.Wrapf(err, "error retrieving temporary directory for container %s", c.ID())
- }
- c.state.RunDir = dir
-
- if err := c.runtime.state.SaveContainer(c); err != nil {
- return errors.Wrapf(err, "error refreshing state for container %s", c.ID())
- }
-
- return nil
-}
-
-// Init creates a container in the OCI runtime
-func (c *Container) Init() (err error) {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- if c.state.State != ContainerStateConfigured {
- return errors.Wrapf(ErrCtrExists, "container %s has already been created in runtime", c.ID())
- }
-
- if err := c.mountStorage(); err != nil {
- return err
- }
- defer func() {
- if err != nil {
- if err2 := c.cleanupStorage(); err2 != nil {
- logrus.Errorf("Error cleaning up storage for container %s: %v", c.ID(), err2)
- }
- }
- }()
-
- // Make a network namespace for the container
- if c.config.CreateNetNS && c.state.NetNS == nil {
- if err := c.runtime.createNetNS(c); err != nil {
- return err
- }
- }
- defer func() {
- if err != nil {
- if err2 := c.runtime.teardownNetNS(c); err2 != nil {
- logrus.Errorf("Error tearing down network namespace for container %s: %v", c.ID(), err2)
- }
- }
- }()
-
- // If the OCI spec already exists, we need to replace it
- // Cannot guarantee some things, e.g. network namespaces, have the same
- // paths
- jsonPath := filepath.Join(c.bundlePath(), "config.json")
- if _, err := os.Stat(jsonPath); err != nil {
- if !os.IsNotExist(err) {
- return errors.Wrapf(err, "error doing stat on container %s spec", c.ID())
- }
- // The spec does not exist, we're fine
- } else {
- // The spec exists, need to remove it
- if err := os.Remove(jsonPath); err != nil {
- return errors.Wrapf(err, "error replacing runtime spec for container %s", c.ID())
- }
- }
-
- // Copy /etc/resolv.conf to the container's rundir
- resolvPath := "/etc/resolv.conf"
-
- // Check if the host system is using system resolve and if so
- // copy its resolv.conf
- _, err = os.Stat("/run/systemd/resolve/resolv.conf")
- if err == nil {
- resolvPath = "/run/systemd/resolve/resolv.conf"
- }
- runDirResolv, err := c.copyHostFileToRundir(resolvPath)
- if err != nil {
- return errors.Wrapf(err, "unable to copy resolv.conf to ", runDirResolv)
- }
- // Copy /etc/hosts to the container's rundir
- runDirHosts, err := c.copyHostFileToRundir("/etc/hosts")
- if err != nil {
- return errors.Wrapf(err, "unable to copy /etc/hosts to ", runDirHosts)
- }
-
- // Save OCI spec to disk
- g := generate.NewFromSpec(c.config.Spec)
- // If network namespace was requested, add it now
- if c.config.CreateNetNS {
- g.AddOrReplaceLinuxNamespace(spec.NetworkNamespace, c.state.NetNS.Path())
- }
- // Remove default /etc/shm mount
- g.RemoveMount("/dev/shm")
- // Mount ShmDir from host into container
- shmMnt := spec.Mount{
- Type: "bind",
- Source: c.config.ShmDir,
- Destination: "/dev/shm",
- Options: []string{"rw", "bind"},
- }
- g.AddMount(shmMnt)
- // Bind mount resolv.conf
- resolvMnt := spec.Mount{
- Type: "bind",
- Source: runDirResolv,
- Destination: "/etc/resolv.conf",
- Options: []string{"rw", "bind"},
- }
- g.AddMount(resolvMnt)
- // Bind mount hosts
- hostsMnt := spec.Mount{
- Type: "bind",
- Source: runDirHosts,
- Destination: "/etc/hosts",
- Options: []string{"rw", "bind"},
- }
- g.AddMount(hostsMnt)
-
- if c.config.User != "" {
- if !c.state.Mounted {
- return errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to translate User field", c.ID())
- }
- uid, gid, err := chrootuser.GetUser(c.state.Mountpoint, c.config.User)
- if err != nil {
- return err
- }
- // User and Group must go together
- g.SetProcessUID(uid)
- g.SetProcessGID(gid)
- }
-
- // Add shared namespaces from other containers
- if c.config.IPCNsCtr != "" {
- ipcCtr, err := c.runtime.state.Container(c.config.IPCNsCtr)
- if err != nil {
- return err
- }
-
- nsPath, err := ipcCtr.NamespacePath(IPCNS)
- if err != nil {
- return err
- }
-
- if err := g.AddOrReplaceLinuxNamespace(spec.IPCNamespace, nsPath); err != nil {
- return err
- }
- }
- if c.config.MountNsCtr != "" {
- mountCtr, err := c.runtime.state.Container(c.config.MountNsCtr)
- if err != nil {
- return err
- }
-
- nsPath, err := mountCtr.NamespacePath(MountNS)
- if err != nil {
- return err
- }
-
- if err := g.AddOrReplaceLinuxNamespace(spec.MountNamespace, nsPath); err != nil {
- return err
- }
- }
- if c.config.NetNsCtr != "" {
- netCtr, err := c.runtime.state.Container(c.config.NetNsCtr)
- if err != nil {
- return err
- }
-
- nsPath, err := netCtr.NamespacePath(NetNS)
- if err != nil {
- return err
- }
-
- if err := g.AddOrReplaceLinuxNamespace(spec.NetworkNamespace, nsPath); err != nil {
- return err
- }
- }
- if c.config.PIDNsCtr != "" {
- pidCtr, err := c.runtime.state.Container(c.config.PIDNsCtr)
- if err != nil {
- return err
- }
-
- nsPath, err := pidCtr.NamespacePath(PIDNS)
- if err != nil {
- return err
- }
-
- if err := g.AddOrReplaceLinuxNamespace(string(spec.PIDNamespace), nsPath); err != nil {
- return err
- }
- }
- if c.config.UserNsCtr != "" {
- userCtr, err := c.runtime.state.Container(c.config.UserNsCtr)
- if err != nil {
- return err
- }
-
- nsPath, err := userCtr.NamespacePath(UserNS)
- if err != nil {
- return err
- }
-
- if err := g.AddOrReplaceLinuxNamespace(spec.UserNamespace, nsPath); err != nil {
- return err
- }
- }
- if c.config.UTSNsCtr != "" {
- utsCtr, err := c.runtime.state.Container(c.config.UTSNsCtr)
- if err != nil {
- return err
- }
-
- nsPath, err := utsCtr.NamespacePath(UTSNS)
- if err != nil {
- return err
- }
-
- if err := g.AddOrReplaceLinuxNamespace(spec.UTSNamespace, nsPath); err != nil {
- return err
- }
- }
- if c.config.CgroupNsCtr != "" {
- cgroupCtr, err := c.runtime.state.Container(c.config.CgroupNsCtr)
- if err != nil {
- return err
- }
-
- nsPath, err := cgroupCtr.NamespacePath(CgroupNS)
- if err != nil {
- return err
- }
-
- if err := g.AddOrReplaceLinuxNamespace(spec.CgroupNamespace, nsPath); err != nil {
- return err
- }
- }
-
- c.runningSpec = g.Spec()
- c.runningSpec.Root.Path = c.state.Mountpoint
- c.runningSpec.Annotations[crioAnnotations.Created] = c.config.CreatedTime.Format(time.RFC3339Nano)
- c.runningSpec.Annotations["org.opencontainers.image.stopSignal"] = fmt.Sprintf("%d", c.config.StopSignal)
-
- fileJSON, err := json.Marshal(c.runningSpec)
- if err != nil {
- return errors.Wrapf(err, "error exporting runtime spec for container %s to JSON", c.ID())
- }
- if err := ioutil.WriteFile(jsonPath, fileJSON, 0644); err != nil {
- return errors.Wrapf(err, "error writing runtime spec JSON to file for container %s", c.ID())
- }
-
- logrus.Debugf("Created OCI spec for container %s at %s", c.ID(), jsonPath)
-
- c.state.ConfigPath = jsonPath
-
- // With the spec complete, do an OCI create
- // TODO set cgroup parent in a sane fashion
- if err := c.runtime.ociRuntime.createContainer(c, CgroupParent); err != nil {
- return err
- }
-
- logrus.Debugf("Created container %s in runc", c.ID())
-
- c.state.State = ContainerStateCreated
-
- return c.save()
-}
-
-// Start starts a container
-func (c *Container) Start() error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- // Container must be created or stopped to be started
- if !(c.state.State == ContainerStateCreated || c.state.State == ContainerStateStopped) {
- return errors.Wrapf(ErrCtrStateInvalid, "container %s must be in Created or Stopped state to be started", c.ID())
- }
-
- // Mount storage for the container
- if err := c.mountStorage(); err != nil {
- return err
- }
-
- if err := c.runtime.ociRuntime.startContainer(c); err != nil {
- return err
- }
-
- logrus.Debugf("Started container %s", c.ID())
-
- c.state.State = ContainerStateRunning
-
- return c.save()
-}
-
-// Stop uses the container's stop signal (or SIGTERM if no signal was specified)
-// to stop the container, and if it has not stopped after the given timeout (in
-// seconds), uses SIGKILL to attempt to forcibly stop the container.
-// If timeout is 0, SIGKILL will be used immediately
-func (c *Container) Stop(timeout uint) error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- logrus.Debugf("Stopping ctr %s with timeout %d", c.ID(), timeout)
-
- if c.state.State == ContainerStateConfigured ||
- c.state.State == ContainerStateUnknown ||
- c.state.State == ContainerStatePaused {
- return errors.Wrapf(ErrCtrStateInvalid, "can only stop created, running, or stopped containers")
- }
-
- if err := c.runtime.ociRuntime.stopContainer(c, timeout); err != nil {
- return err
- }
-
- // Sync the container's state to pick up return code
- if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
- return err
- }
-
- return c.cleanupStorage()
-}
-
-// Kill sends a signal to a container
-func (c *Container) Kill(signal uint) error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- if c.state.State != ContainerStateRunning {
- return errors.Wrapf(ErrCtrStateInvalid, "can only kill running containers")
- }
-
- return c.runtime.ociRuntime.killContainer(c, signal)
-}
-
-// Exec starts a new process inside the container
-func (c *Container) Exec(tty, privileged bool, env, cmd []string, user string) error {
- var capList []string
-
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- conState := c.state.State
-
- if conState != ContainerStateRunning {
- return errors.Errorf("cannot attach to container that is not running")
- }
- if privileged {
- capList = caps.GetAllCapabilities()
- }
- globalOpts := runcGlobalOptions{
- log: c.LogPath(),
- }
- execOpts := runcExecOptions{
- capAdd: capList,
- pidFile: filepath.Join(c.state.RunDir, fmt.Sprintf("%s-execpid", stringid.GenerateNonCryptoID()[:12])),
- env: env,
- user: user,
- cwd: c.config.Spec.Process.Cwd,
- tty: tty,
- }
-
- return c.runtime.ociRuntime.execContainer(c, cmd, globalOpts, execOpts)
-}
-
-// Attach attaches to a container
-// Returns fully qualified URL of streaming server for the container
-func (c *Container) Attach(noStdin bool, keys string, attached chan<- bool) error {
- if !c.locked {
- c.lock.Lock()
- if err := c.syncContainer(); err != nil {
- c.lock.Unlock()
- return err
- }
- c.lock.Unlock()
- }
-
- if c.state.State != ContainerStateCreated &&
- c.state.State != ContainerStateRunning {
- return errors.Wrapf(ErrCtrStateInvalid, "can only attach to created or running containers")
- }
-
- // Check the validity of the provided keys first
- var err error
- detachKeys := []byte{}
- if len(keys) > 0 {
- detachKeys, err = term.ToBytes(keys)
- if err != nil {
- return errors.Wrapf(err, "invalid detach keys")
- }
- }
-
- resize := make(chan remotecommand.TerminalSize)
- defer close(resize)
-
- err = c.attachContainerSocket(resize, noStdin, detachKeys, attached)
- return err
-}
-
-// Mount mounts a container's filesystem on the host
-// The path where the container has been mounted is returned
-func (c *Container) Mount(label string) (string, error) {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return "", err
- }
- }
-
- // return mountpoint if container already mounted
- if c.state.Mounted {
- return c.state.Mountpoint, nil
- }
-
- mountLabel := label
- if label == "" {
- mountLabel = c.config.MountLabel
- }
- mountPoint, err := c.runtime.store.Mount(c.ID(), mountLabel)
- if err != nil {
- return "", err
- }
- c.state.Mountpoint = mountPoint
- c.state.Mounted = true
- c.config.MountLabel = mountLabel
-
- if err := c.save(); err != nil {
- return "", err
- }
-
- return mountPoint, nil
-}
-
-// Unmount unmounts a container's filesystem on the host
-func (c *Container) Unmount() error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- if c.state.State == ContainerStateRunning || c.state.State == ContainerStatePaused {
- return errors.Wrapf(ErrCtrStateInvalid, "cannot remove storage for container %s as it is running or paused", c.ID())
- }
-
- return c.cleanupStorage()
-}
-
-// Pause pauses a container
-func (c *Container) Pause() error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- if c.state.State == ContainerStatePaused {
- return errors.Wrapf(ErrCtrStateInvalid, "%q is already paused", c.ID())
- }
- if c.state.State != ContainerStateRunning && c.state.State != ContainerStateCreated {
- return errors.Wrapf(ErrCtrStateInvalid, "%q is not running/created, can't pause", c.state.State)
- }
- if err := c.runtime.ociRuntime.pauseContainer(c); err != nil {
- return err
- }
-
- logrus.Debugf("Paused container %s", c.ID())
-
- c.state.State = ContainerStatePaused
-
- return c.save()
-}
-
-// Unpause unpauses a container
-func (c *Container) Unpause() error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- if c.state.State != ContainerStatePaused {
- return errors.Wrapf(ErrCtrStateInvalid, "%q is not paused, can't unpause", c.ID())
- }
- if err := c.runtime.ociRuntime.unpauseContainer(c); err != nil {
- return err
- }
-
- logrus.Debugf("Unpaused container %s", c.ID())
-
- c.state.State = ContainerStateRunning
-
- return c.save()
-}
-
-// Export exports a container's root filesystem as a tar archive
-// The archive will be saved as a file at the given path
-func (c *Container) Export(path string) error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- return c.export(path)
-}
-
-func (c *Container) export(path string) error {
- mountPoint := c.state.Mountpoint
- if !c.state.Mounted {
- mount, err := c.runtime.store.Mount(c.ID(), c.config.MountLabel)
- if err != nil {
- return errors.Wrapf(err, "error mounting container %q", c.ID())
- }
- mountPoint = mount
- defer func() {
- if err := c.runtime.store.Unmount(c.ID()); err != nil {
- logrus.Errorf("error unmounting container %q: %v", c.ID(), err)
- }
- }()
- }
-
- input, err := archive.Tar(mountPoint, archive.Uncompressed)
- if err != nil {
- return errors.Wrapf(err, "error reading container directory %q", c.ID())
- }
-
- outFile, err := os.Create(path)
- if err != nil {
- return errors.Wrapf(err, "error creating file %q", path)
- }
- defer outFile.Close()
-
- _, err = io.Copy(outFile, input)
- return err
-}
-
-// AddArtifact creates and writes to an artifact file for the container
-func (c *Container) AddArtifact(name string, data []byte) error {
- if !c.valid {
- return ErrCtrRemoved
- }
-
- return ioutil.WriteFile(c.getArtifactPath(name), data, 0740)
-}
-
-// GetArtifact reads the specified artifact file from the container
-func (c *Container) GetArtifact(name string) ([]byte, error) {
- if !c.valid {
- return nil, ErrCtrRemoved
- }
-
- return ioutil.ReadFile(c.getArtifactPath(name))
-}
-
-// RemoveArtifact deletes the specified artifacts file
-func (c *Container) RemoveArtifact(name string) error {
- if !c.valid {
- return ErrCtrRemoved
- }
-
- return os.Remove(c.getArtifactPath(name))
-}
-
-func (c *Container) getArtifactPath(name string) string {
- return filepath.Join(c.config.StaticDir, artifactsDir, name)
-}
-
-// Inspect a container for low-level information
-func (c *Container) Inspect(size bool) (*ContainerInspectData, error) {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return nil, err
- }
- }
-
- storeCtr, err := c.runtime.store.Container(c.ID())
- if err != nil {
- return nil, errors.Wrapf(err, "error getting container from store %q", c.ID())
- }
- layer, err := c.runtime.store.Layer(storeCtr.LayerID)
- if err != nil {
- return nil, errors.Wrapf(err, "error reading information about layer %q", storeCtr.LayerID)
- }
- driverData, err := driver.GetDriverData(c.runtime.store, layer.ID)
- if err != nil {
- return nil, errors.Wrapf(err, "error getting graph driver info %q", c.ID())
- }
-
- return c.getContainerInspectData(size, driverData)
-}
-
-// Commit commits the changes between a container and its image, creating a new
-// image
-func (c *Container) Commit(pause bool, options CopyOptions) error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
-
- if c.state.State == ContainerStateRunning && pause {
- if err := c.runtime.ociRuntime.pauseContainer(c); err != nil {
- return errors.Wrapf(err, "error pausing container %q", c.ID())
- }
- defer func() {
- if err := c.runtime.ociRuntime.unpauseContainer(c); err != nil {
- logrus.Errorf("error unpausing container %q: %v", c.ID(), err)
- }
- }()
- }
-
- tempFile, err := ioutil.TempFile(c.runtime.config.TmpDir, "podman-commit")
- if err != nil {
- return errors.Wrapf(err, "error creating temp file")
- }
- defer os.Remove(tempFile.Name())
- defer tempFile.Close()
-
- if err := c.export(tempFile.Name()); err != nil {
- return err
- }
- return c.runtime.ImportImage(tempFile.Name(), options)
-}
-
-// Wait blocks on a container to exit and returns its exit code
-func (c *Container) Wait() (int32, error) {
- if !c.valid {
- return -1, ErrCtrRemoved
- }
-
- err := wait.PollImmediateInfinite(1,
- func() (bool, error) {
- stopped, err := c.isStopped()
- if err != nil {
- return false, err
- }
- if !stopped {
- return false, nil
- } else { // nolint
- return true, nil // nolint
- } // nolint
- },
- )
- if err != nil {
- return 0, err
- }
- exitCode := c.state.ExitCode
- return exitCode, nil
-}
-
-func (c *Container) isStopped() (bool, error) {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
- }
- err := c.syncContainer()
- if err != nil {
- return true, err
- }
- return c.state.State == ContainerStateStopped, nil
-}
-
-// save container state to the database
-func (c *Container) save() error {
- if err := c.runtime.state.SaveContainer(c); err != nil {
- return errors.Wrapf(err, "error saving container %s state", c.ID())
- }
- return nil
-}
-
-// mountStorage sets up the container's root filesystem
-// It mounts the image and any other requested mounts
-// TODO: Add ability to override mount label so we can use this for Mount() too
-// TODO: Can we use this for export? Copying SHM into the export might not be
-// good
-func (c *Container) mountStorage() (err error) {
- // Container already mounted, nothing to do
- if c.state.Mounted {
- return nil
- }
-
- // TODO: generalize this mount code so it will mount every mount in ctr.config.Mounts
-
- mounted, err := mount.Mounted(c.config.ShmDir)
- if err != nil {
- return errors.Wrapf(err, "unable to determine if %q is mounted", c.config.ShmDir)
- }
-
- if !mounted {
- shmOptions := fmt.Sprintf("mode=1777,size=%d", c.config.ShmSize)
- if err := unix.Mount("shm", c.config.ShmDir, "tmpfs", unix.MS_NOEXEC|unix.MS_NOSUID|unix.MS_NODEV,
- label.FormatMountLabel(shmOptions, c.config.MountLabel)); err != nil {
- return errors.Wrapf(err, "failed to mount shm tmpfs %q", c.config.ShmDir)
- }
- }
-
- mountPoint, err := c.runtime.storageService.MountContainerImage(c.ID())
- if err != nil {
- return errors.Wrapf(err, "error mounting storage for container %s", c.ID())
- }
- c.state.Mounted = true
- c.state.Mountpoint = mountPoint
-
- logrus.Debugf("Created root filesystem for container %s at %s", c.ID(), c.state.Mountpoint)
-
- defer func() {
- if err != nil {
- if err2 := c.cleanupStorage(); err2 != nil {
- logrus.Errorf("Error unmounting storage for container %s: %v", c.ID(), err)
- }
- }
- }()
-
- return c.save()
-}
-
-// CleanupStorage unmounts all mount points in container and cleans up container storage
-func (c *Container) CleanupStorage() error {
- if !c.locked {
- c.lock.Lock()
- defer c.lock.Unlock()
- if err := c.syncContainer(); err != nil {
- return err
- }
- }
- return c.cleanupStorage()
-}
-
-// cleanupStorage unmounts and cleans up the container's root filesystem
-func (c *Container) cleanupStorage() error {
- if !c.state.Mounted {
- // Already unmounted, do nothing
- return nil
- }
-
- for _, mount := range c.config.Mounts {
- if err := unix.Unmount(mount, unix.MNT_DETACH); err != nil {
- if err != syscall.EINVAL {
- logrus.Warnf("container %s failed to unmount %s : %v", c.ID(), mount, err)
- }
- }
- }
-
- // Also unmount storage
- if err := c.runtime.storageService.UnmountContainerImage(c.ID()); err != nil {
- return errors.Wrapf(err, "error unmounting container %s root filesystem", c.ID())
- }
-
- c.state.Mountpoint = ""
- c.state.Mounted = false
-
- return c.save()
-}
-
// CGroupPath returns a cgroups "path" for a given container.
func (c *Container) CGroupPath() cgroups.Path {
return cgroups.StaticPath(filepath.Join(c.config.CgroupParent, fmt.Sprintf("libpod-conmon-%s", c.ID())))
}
-// copyHostFileToRundir copies the provided file to the runtimedir
-func (c *Container) copyHostFileToRundir(sourcePath string) (string, error) {
- destFileName := filepath.Join(c.state.RunDir, filepath.Base(sourcePath))
- if err := fileutils.CopyFile(sourcePath, destFileName); err != nil {
- return "", err
- }
- // Relabel runDirResolv for the container
- if err := label.Relabel(destFileName, c.config.MountLabel, false); err != nil {
- return "", err
- }
- return destFileName, nil
-}
-
// StopTimeout returns a stop timeout field for this container
func (c *Container) StopTimeout() uint {
return c.config.StopTimeout
}
-
-// Batch starts a batch operation on the given container
-// All commands in the passed function will execute under the same lock and
-// without syncronyzing state after each operation
-// This will result in substantial performance benefits when running numerous
-// commands on the same container
-// Note that the container passed into the Batch function cannot be removed
-// during batched operations. runtime.RemoveContainer can only be called outside
-// of Batch
-// Any error returned by the given batch function will be returned unmodified by
-// Batch
-// As Batch normally disables updating the current state of the container, the
-// Sync() function is provided to enable container state to be updated and
-// checked within Batch.
-func (c *Container) Batch(batchFunc func(*Container) error) error {
- c.lock.Lock()
- defer c.lock.Unlock()
-
- if err := c.syncContainer(); err != nil {
- return err
- }
-
- newCtr := new(Container)
- newCtr.config = c.config
- newCtr.state = c.state
- newCtr.runtime = c.runtime
- newCtr.lock = c.lock
- newCtr.valid = true
-
- newCtr.locked = true
-
- if err := batchFunc(newCtr); err != nil {
- return err
- }
-
- newCtr.locked = false
-
- return c.save()
-}
-
-// Sync updates the current state of the container, checking whether its state
-// has changed
-// Sync can only be used inside Batch() - otherwise, it will be done
-// automatically.
-// When called outside Batch(), Sync() is a no-op
-func (c *Container) Sync() error {
- if !c.locked {
- return nil
- }
-
- // If runc knows about the container, update its status in runc
- // And then save back to disk
- if (c.state.State != ContainerStateUnknown) &&
- (c.state.State != ContainerStateConfigured) {
- oldState := c.state.State
- // TODO: optionally replace this with a stat for the exit file
- if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
- return err
- }
- // Only save back to DB if state changed
- if c.state.State != oldState {
- if err := c.save(); err != nil {
- return err
- }
- }
- }
-
- return nil
-}