package libpod import ( "bytes" "fmt" "io/ioutil" "net" "os" "time" "github.com/containernetworking/cni/pkg/types" cnitypes "github.com/containernetworking/cni/pkg/types/current" "github.com/containers/common/pkg/secrets" "github.com/containers/image/v5/manifest" "github.com/containers/podman/v3/libpod/define" "github.com/containers/podman/v3/libpod/lock" "github.com/containers/storage" "github.com/cri-o/ocicni/pkg/ocicni" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) // CgroupfsDefaultCgroupParent is the cgroup parent for CGroupFS in libpod const CgroupfsDefaultCgroupParent = "/libpod_parent" // SystemdDefaultCgroupParent is the cgroup parent for the systemd cgroup // manager in libpod const SystemdDefaultCgroupParent = "machine.slice" // SystemdDefaultRootlessCgroupParent is the cgroup parent for the systemd cgroup // manager in libpod when running as rootless const SystemdDefaultRootlessCgroupParent = "user.slice" // DefaultWaitInterval is the default interval between container status checks // while waiting. const DefaultWaitInterval = 250 * time.Millisecond // LinuxNS represents a Linux namespace type LinuxNS int const ( // InvalidNS is an invalid namespace InvalidNS LinuxNS = iota // IPCNS is the IPC namespace IPCNS LinuxNS = iota // MountNS is the mount namespace MountNS LinuxNS = iota // NetNS is the network namespace NetNS LinuxNS = iota // PIDNS is the PID namespace PIDNS LinuxNS = iota // UserNS is the user namespace UserNS LinuxNS = iota // UTSNS is the UTS namespace UTSNS LinuxNS = iota // CgroupNS is the CGroup namespace CgroupNS LinuxNS = iota ) // String returns a string representation of a Linux namespace // It is guaranteed to be the name of the namespace in /proc for valid ns types func (ns LinuxNS) String() string { switch ns { case InvalidNS: return "invalid" case IPCNS: return "ipc" case MountNS: return "mnt" case NetNS: return "net" case PIDNS: return "pid" case UserNS: return "user" case UTSNS: return "uts" case CgroupNS: return "cgroup" default: return "unknown" } } // Container is a single OCI container. // All operations on a Container that access state must begin with a call to // syncContainer(). // There is no guarantee that state exists in a readable state before // syncContainer() is run, and even if it does, its contents will be out of date // and must be refreshed from the database. // Generally, this requirement applies only to top-level functions; helpers can // assume that their callers handled this requirement. Generally speaking, if a // function takes the container lock and accesses any part of state, it should // syncContainer() immediately after locking. type Container struct { config *ContainerConfig state *ContainerState // Batched indicates that a container has been locked as part of a // Batch() operation // Functions called on a batched container will not lock or sync batched bool valid bool lock lock.Locker runtime *Runtime ociRuntime OCIRuntime rootlessSlirpSyncR *os.File rootlessSlirpSyncW *os.File rootlessPortSyncR *os.File rootlessPortSyncW *os.File // A restored container should have the same IP address as before // being checkpointed. If requestedIP is set it will be used instead // of config.StaticIP. requestedIP net.IP // A restored container should have the same MAC address as before // being checkpointed. If requestedMAC is set it will be used instead // of config.StaticMAC. requestedMAC net.HardwareAddr // This is true if a container is restored from a checkpoint. restoreFromCheckpoint bool slirp4netnsSubnet *net.IPNet } // ContainerState contains the current state of the container // It is stored on disk in a tmpfs and recreated on reboot type ContainerState struct { // The current state of the running container State define.ContainerStatus `json:"state"` // The path to the JSON OCI runtime spec for this container ConfigPath string `json:"configPath,omitempty"` // RunDir is a per-boot directory for container content RunDir string `json:"runDir,omitempty"` // Mounted indicates whether the container's storage has been mounted // for use Mounted bool `json:"mounted,omitempty"` // Mountpoint contains the path to the container's mounted storage as given // by containers/storage. Mountpoint string `json:"mountPoint,omitempty"` // StartedTime is the time the container was started StartedTime time.Time `json:"startedTime,omitempty"` // FinishedTime is the time the container finished executing FinishedTime time.Time `json:"finishedTime,omitempty"` // ExitCode is the exit code returned when the container stopped ExitCode int32 `json:"exitCode,omitempty"` // Exited is whether the container has exited Exited bool `json:"exited,omitempty"` // OOMKilled indicates that the container was killed as it ran out of // memory OOMKilled bool `json:"oomKilled,omitempty"` // PID is the PID of a running container PID int `json:"pid,omitempty"` // ConmonPID is the PID of the container's conmon ConmonPID int `json:"conmonPid,omitempty"` // ExecSessions contains all exec sessions that are associated with this // container. ExecSessions map[string]*ExecSession `json:"newExecSessions,omitempty"` // LegacyExecSessions are legacy exec sessions from older versions of // Podman. // These are DEPRECATED and will be removed in a future release. LegacyExecSessions map[string]*legacyExecSession `json:"execSessions,omitempty"` // NetworkStatus contains the configuration results for all networks // the pod is attached to. Only populated if we created a network // namespace for the container, and the network namespace is currently // active NetworkStatus []*cnitypes.Result `json:"networkResults,omitempty"` // BindMounts contains files that will be bind-mounted into the // container when it is mounted. // These include /etc/hosts and /etc/resolv.conf // This maps the path the file will be mounted to in the container to // the path of the file on disk outside the container BindMounts map[string]string `json:"bindMounts,omitempty"` // StoppedByUser indicates whether the container was stopped by an // explicit call to the Stop() API. StoppedByUser bool `json:"stoppedByUser,omitempty"` // RestartPolicyMatch indicates whether the conditions for restart // policy have been met. RestartPolicyMatch bool `json:"restartPolicyMatch,omitempty"` // RestartCount is how many times the container was restarted by its // restart policy. This is NOT incremented by normal container restarts // (only by restart policy). RestartCount uint `json:"restartCount,omitempty"` // ExtensionStageHooks holds hooks which will be executed by libpod // and not delegated to the OCI runtime. ExtensionStageHooks map[string][]spec.Hook `json:"extensionStageHooks,omitempty"` // NetInterfaceDescriptions describe the relationship between a CNI // network and an interface names NetInterfaceDescriptions ContainerNetworkDescriptions `json:"networkDescriptions,omitempty"` // containerPlatformState holds platform-specific container state. containerPlatformState } // ContainerNamedVolume is a named volume that will be mounted into the // container. Each named volume is a libpod Volume present in the state. type ContainerNamedVolume struct { // Name is the name of the volume to mount in. // Must resolve to a valid volume present in this Podman. Name string `json:"volumeName"` // Dest is the mount's destination Dest string `json:"dest"` // Options are fstab style mount options Options []string `json:"options,omitempty"` } // ContainerOverlayVolume is a overlay volume that will be mounted into the // container. Each volume is a libpod Volume present in the state. type ContainerOverlayVolume struct { // Destination is the absolute path where the mount will be placed in the container. Dest string `json:"dest"` // Source specifies the source path of the mount. Source string `json:"source,omitempty"` // Options holds overlay volume options. Options []string `json:"options,omitempty"` } // ContainerImageVolume is a volume based on a container image. The container // image is first mounted on the host and is then bind-mounted into the // container. type ContainerImageVolume struct { // Source is the source of the image volume. The image can be referred // to by name and by ID. Source string `json:"source"` // Dest is the absolute path of the mount in the container. Dest string `json:"dest"` // ReadWrite sets the volume writable. ReadWrite bool `json:"rw"` } // ContainerSecret is a secret that is mounted in a container type ContainerSecret struct { // Secret is the secret *secrets.Secret // UID is the UID of the secret file UID uint32 // GID is the GID of the secret file GID uint32 // Mode is the mode of the secret file Mode uint32 } // ContainerNetworkDescriptions describes the relationship between the CNI // network and the ethN where N is an integer type ContainerNetworkDescriptions map[string]int // Config accessors // Unlocked // Config returns the configuration used to create the container func (c *Container) Config() *ContainerConfig { returnConfig := new(ContainerConfig) if err := JSONDeepCopy(c.config, returnConfig); err != nil { return nil } return returnConfig } // Runtime returns the container's Runtime. func (c *Container) Runtime() *Runtime { return c.runtime } // Spec returns the container's OCI runtime spec // The spec returned is the one used to create the container. The running // spec may differ slightly as mounts are added based on the image func (c *Container) Spec() *spec.Spec { returnSpec := new(spec.Spec) if err := JSONDeepCopy(c.config.Spec, returnSpec); err != nil { return nil } return returnSpec } // specFromState returns the unmarshalled json config of the container. If the // config does not exist (e.g., because the container was never started) return // the spec from the config. func (c *Container) specFromState() (*spec.Spec, error) { returnSpec := c.config.Spec if f, err := os.Open(c.state.ConfigPath); err == nil { returnSpec = new(spec.Spec) content, err := ioutil.ReadAll(f) if err != nil { return nil, errors.Wrapf(err, "error reading container config") } if err := json.Unmarshal(content, &returnSpec); err != nil { return nil, errors.Wrapf(err, "error unmarshalling container config") } } else if !os.IsNotExist(err) { // ignore when the file does not exist return nil, errors.Wrapf(err, "error opening container config") } return returnSpec, nil } // ID returns the container's ID func (c *Container) ID() string { return c.config.ID } // Name returns the container's name func (c *Container) Name() string { return c.config.Name } // PodID returns the full ID of the pod the container belongs to, or "" if it // does not belong to a pod func (c *Container) PodID() string { return c.config.Pod } // Namespace returns the libpod namespace the container is in. // Namespaces are used to logically separate containers and pods in the state. func (c *Container) Namespace() string { return c.config.Namespace } // Image returns the ID and name of the image used as the container's rootfs. func (c *Container) Image() (string, string) { return c.config.RootfsImageID, c.config.RootfsImageName } // RawImageName returns the unprocessed and not-normalized user-specified image // name. func (c *Container) RawImageName() string { return c.config.RawImageName } // ShmDir returns the sources path to be mounted on /dev/shm in container func (c *Container) ShmDir() string { return c.config.ShmDir } // ShmSize returns the size of SHM device to be mounted into the container func (c *Container) ShmSize() int64 { return c.config.ShmSize } // StaticDir returns the directory used to store persistent container files func (c *Container) StaticDir() string { return c.config.StaticDir } // NamedVolumes returns the container's named volumes. // The name of each is guaranteed to point to a valid libpod Volume present in // the state. func (c *Container) NamedVolumes() []*ContainerNamedVolume { volumes := []*ContainerNamedVolume{} for _, vol := range c.config.NamedVolumes { newVol := new(ContainerNamedVolume) newVol.Name = vol.Name newVol.Dest = vol.Dest newVol.Options = vol.Options volumes = append(volumes, newVol) } return volumes } // Privileged returns whether the container is privileged func (c *Container) Privileged() bool { return c.config.Privileged } // ProcessLabel returns the selinux ProcessLabel of the container func (c *Container) ProcessLabel() string { return c.config.ProcessLabel } // MountLabel returns the SELinux mount label of the container func (c *Container) MountLabel() string { return c.config.MountLabel } // Systemd returns whether the container will be running in systemd mode func (c *Container) Systemd() bool { return c.config.Systemd } // User returns the user who the container is run as func (c *Container) User() string { return c.config.User } // Dependencies gets the containers this container depends upon func (c *Container) Dependencies() []string { // Collect in a map first to remove dupes dependsCtrs := map[string]bool{} // First add all namespace containers if c.config.IPCNsCtr != "" { dependsCtrs[c.config.IPCNsCtr] = true } if c.config.MountNsCtr != "" { dependsCtrs[c.config.MountNsCtr] = true } if c.config.NetNsCtr != "" { dependsCtrs[c.config.NetNsCtr] = true } if c.config.PIDNsCtr != "" { dependsCtrs[c.config.PIDNsCtr] = true } if c.config.UserNsCtr != "" { dependsCtrs[c.config.UserNsCtr] = true } if c.config.UTSNsCtr != "" { dependsCtrs[c.config.UTSNsCtr] = true } if c.config.CgroupNsCtr != "" { dependsCtrs[c.config.CgroupNsCtr] = true } // Add all generic dependencies for _, id := range c.config.Dependencies { dependsCtrs[id] = true } if len(dependsCtrs) == 0 { return []string{} } depends := make([]string, 0, len(dependsCtrs)) for ctr := range dependsCtrs { depends = append(depends, ctr) } return depends } // NewNetNS returns whether the container will create a new network namespace func (c *Container) NewNetNS() bool { return c.config.CreateNetNS } // PortMappings returns the ports that will be mapped into a container if // a new network namespace is created // If NewNetNS() is false, this value is unused func (c *Container) PortMappings() ([]ocicni.PortMapping, error) { // First check if the container belongs to a network namespace (like a pod) if len(c.config.NetNsCtr) > 0 { netNsCtr, err := c.runtime.GetContainer(c.config.NetNsCtr) if err != nil { return nil, errors.Wrapf(err, "unable to lookup network namespace for container %s", c.ID()) } return netNsCtr.PortMappings() } return c.config.PortMappings, nil } // DNSServers returns DNS servers that will be used in the container's // resolv.conf // If empty, DNS server from the host's resolv.conf will be used instead func (c *Container) DNSServers() []net.IP { return c.config.DNSServer } // DNSSearch returns the DNS search domains that will be used in the container's // resolv.conf // If empty, DNS Search domains from the host's resolv.conf will be used instead func (c *Container) DNSSearch() []string { return c.config.DNSSearch } // DNSOption returns the DNS options that will be used in the container's // resolv.conf // If empty, options from the host's resolv.conf will be used instead func (c *Container) DNSOption() []string { return c.config.DNSOption } // HostsAdd returns hosts that will be added to the container's hosts file // The host system's hosts file is used as a base, and these are appended to it func (c *Container) HostsAdd() []string { return c.config.HostAdd } // UserVolumes returns user-added volume mounts in the container. // These are not added to the spec, but are used during image commit and to // trigger some OCI hooks. func (c *Container) UserVolumes() []string { volumes := make([]string, 0, len(c.config.UserVolumes)) volumes = append(volumes, c.config.UserVolumes...) return volumes } // Entrypoint is the container's entrypoint. // This is not added to the spec, but is instead used during image commit. func (c *Container) Entrypoint() []string { entrypoint := make([]string, 0, len(c.config.Entrypoint)) entrypoint = append(entrypoint, c.config.Entrypoint...) return entrypoint } // Command is the container's command // This is not added to the spec, but is instead used during image commit func (c *Container) Command() []string { command := make([]string, 0, len(c.config.Command)) command = append(command, c.config.Command...) return command } // Stdin returns whether STDIN on the container will be kept open func (c *Container) Stdin() bool { return c.config.Stdin } // Labels returns the container's labels func (c *Container) Labels() map[string]string { labels := make(map[string]string) for key, value := range c.config.Labels { labels[key] = value } return labels } // StopSignal is the signal that will be used to stop the container // If it fails to stop the container, SIGKILL will be used after a timeout // If StopSignal is 0, the default signal of SIGTERM will be used func (c *Container) StopSignal() uint { return c.config.StopSignal } // StopTimeout returns the container's stop timeout // If the container's default stop signal fails to kill the container, SIGKILL // will be used after this timeout func (c *Container) StopTimeout() uint { return c.config.StopTimeout } // CreatedTime gets the time when the container was created func (c *Container) CreatedTime() time.Time { return c.config.CreatedTime } // CgroupParent gets the container's CGroup parent func (c *Container) CgroupParent() string { return c.config.CgroupParent } // 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 the runtime func (c *Container) LogPath() string { return c.config.LogPath } // LogTag returns the tag to the container's log file func (c *Container) LogTag() string { return c.config.LogTag } // RestartPolicy returns the container's restart policy. func (c *Container) RestartPolicy() string { return c.config.RestartPolicy } // RestartRetries returns the number of retries that will be attempted when // using the "on-failure" restart policy func (c *Container) RestartRetries() uint { return c.config.RestartRetries } // LogDriver returns the log driver for this container func (c *Container) LogDriver() string { return c.config.LogDriver } // RuntimeName returns the name of the runtime func (c *Container) RuntimeName() string { return c.config.OCIRuntime } // Runtime spec accessors // Unlocked // Hostname gets the container's hostname func (c *Container) Hostname() string { if c.config.Spec.Hostname != "" { return c.config.Spec.Hostname } if len(c.ID()) < 11 { return c.ID() } return c.ID()[:12] } // WorkingDir returns the containers working dir func (c *Container) WorkingDir() string { if c.config.Spec.Process != nil { return c.config.Spec.Process.Cwd } return "/" } // State Accessors // Require locking // State returns the current state of the container func (c *Container) State() (define.ContainerStatus, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return define.ContainerStateUnknown, err } } return c.state.State, nil } // Mounted returns whether the container is mounted and the path it is mounted // at (if it is mounted). // If the container is not mounted, no error is returned, and the mountpoint // will be set to "". func (c *Container) Mounted() (bool, string, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return false, "", errors.Wrapf(err, "error updating container %s state", c.ID()) } } // We cannot directly return c.state.Mountpoint as it is not guaranteed // to be set if the container is mounted, only if the container has been // prepared with c.prepare(). // Instead, let's call into c/storage mountedTimes, err := c.runtime.storageService.MountedContainerImage(c.ID()) if err != nil { return false, "", err } if mountedTimes > 0 { mountPoint, err := c.runtime.storageService.GetMountpoint(c.ID()) if err != nil { return false, "", err } return true, mountPoint, nil } return false, "", nil } // StartedTime is the time the container was started func (c *Container) StartedTime() (time.Time, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return time.Time{}, errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.state.StartedTime, nil } // FinishedTime is the time the container was stopped func (c *Container) FinishedTime() (time.Time, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return time.Time{}, errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.state.FinishedTime, nil } // ExitCode returns the exit code of the container as // an int32, and whether the container has exited. // If the container has not exited, exit code will always be 0. // If the container restarts, the exit code is reset to 0. func (c *Container) ExitCode() (int32, bool, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return 0, false, errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.state.ExitCode, c.state.Exited, nil } // OOMKilled returns whether the container was killed by an OOM condition func (c *Container) OOMKilled() (bool, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return false, errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.state.OOMKilled, nil } // PID returns the PID of the container. // If the container is not running, a pid of 0 will be returned. No error will // occur. func (c *Container) PID() (int, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return -1, err } } return c.state.PID, nil } // ConmonPID Returns the PID of the container's conmon process. // If the container is not running, a PID of 0 will be returned. No error will // occur. func (c *Container) ConmonPID() (int, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return -1, err } } return c.state.ConmonPID, nil } // ExecSessions retrieves active exec sessions running in the container func (c *Container) ExecSessions() ([]string, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return nil, err } } ids := make([]string, 0, len(c.state.ExecSessions)) for id := range c.state.ExecSessions { ids = append(ids, id) } return ids, nil } // ExecSession retrieves detailed information on a single active exec session in // a container func (c *Container) ExecSession(id string) (*ExecSession, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return nil, err } } session, ok := c.state.ExecSessions[id] if !ok { return nil, errors.Wrapf(define.ErrNoSuchExecSession, "no exec session with ID %s found in container %s", id, c.ID()) } returnSession := new(ExecSession) if err := JSONDeepCopy(session, returnSession); err != nil { return nil, errors.Wrapf(err, "error copying contents of container %s exec session %s", c.ID(), session.ID()) } return returnSession, nil } // IPs retrieves a container's IP address(es) // This will only be populated if the container is configured to created a new // network namespace, and that namespace is presently active func (c *Container) IPs() ([]net.IPNet, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return nil, err } } if !c.config.CreateNetNS { return nil, errors.Wrapf(define.ErrInvalidArg, "container %s network namespace is not managed by libpod", c.ID()) } ips := make([]net.IPNet, 0) for _, r := range c.state.NetworkStatus { for _, ip := range r.IPs { ips = append(ips, ip.Address) } } return ips, nil } // Routes retrieves a container's routes // This will only be populated if the container is configured to created a new // network namespace, and that namespace is presently active func (c *Container) Routes() ([]types.Route, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return nil, err } } if !c.config.CreateNetNS { return nil, errors.Wrapf(define.ErrInvalidArg, "container %s network namespace is not managed by libpod", c.ID()) } routes := make([]types.Route, 0) for _, r := range c.state.NetworkStatus { for _, route := range r.Routes { newRoute := types.Route{ Dst: route.Dst, GW: route.GW, } routes = append(routes, newRoute) } } return routes, nil } // BindMounts retrieves bind mounts that were created by libpod and will be // added to the container // All these mounts except /dev/shm are ignored if a mount in the given spec has // the same destination // These mounts include /etc/resolv.conf, /etc/hosts, and /etc/hostname // The return is formatted as a map from destination (mountpoint in the // container) to source (path of the file that will be mounted into the // container) // If the container has not been started yet, an empty map will be returned, as // the files in question are only created when the container is started. func (c *Container) BindMounts() (map[string]string, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return nil, err } } newMap := make(map[string]string, len(c.state.BindMounts)) for key, val := range c.state.BindMounts { newMap[key] = val } return newMap, nil } // StoppedByUser returns whether the container was last stopped by an explicit // call to the Stop() API, or whether it exited naturally. func (c *Container) StoppedByUser() (bool, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return false, err } } return c.state.StoppedByUser, nil } // Misc Accessors // Most will require locking // NamespacePath returns the path of one of the container's namespaces // If the container is not running, an error will be returned func (c *Container) NamespacePath(linuxNS LinuxNS) (string, error) { //nolint:interfacer if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return "", errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.namespacePath(linuxNS) } // namespacePath returns the path of one of the container's namespaces // If the container is not running, an error will be returned func (c *Container) namespacePath(linuxNS LinuxNS) (string, error) { //nolint:interfacer if c.state.State != define.ContainerStateRunning && c.state.State != define.ContainerStatePaused { return "", errors.Wrapf(define.ErrCtrStopped, "cannot get namespace path unless container %s is running", c.ID()) } if linuxNS == InvalidNS { return "", errors.Wrapf(define.ErrInvalidArg, "invalid namespace requested from container %s", c.ID()) } return fmt.Sprintf("/proc/%d/ns/%s", c.state.PID, linuxNS.String()), nil } // CgroupManager returns the cgroup manager used by the given container. func (c *Container) CgroupManager() string { cgroupManager := c.config.CgroupManager if cgroupManager == "" { cgroupManager = c.runtime.config.Engine.CgroupManager } return cgroupManager } // CGroupPath returns a cgroups "path" for the given container. // Note that the container must be running. Otherwise, an error // is returned. func (c *Container) CGroupPath() (string, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return "", errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.cGroupPath() } // cGroupPath returns a cgroups "path" for the given container. // Note that the container must be running. Otherwise, an error // is returned. // NOTE: only call this when owning the container's lock. func (c *Container) cGroupPath() (string, error) { if c.config.NoCgroups || c.config.CgroupsMode == "disabled" { return "", errors.Wrapf(define.ErrNoCgroups, "this container is not creating cgroups") } if c.state.State != define.ContainerStateRunning && c.state.State != define.ContainerStatePaused { return "", errors.Wrapf(define.ErrCtrStopped, "cannot get cgroup path unless container %s is running", c.ID()) } // Read /proc/{PID}/cgroup and find the *longest* cgroup entry. That's // needed to account for hacks in cgroups v1, where each line in the // file could potentially point to a cgroup. The longest one, however, // is the libpod-specific one we're looking for. // // See #8397 on the need for the longest-path look up. // // And another workaround for containers running systemd as the payload. // containers running systemd moves themselves into a child subgroup of // the named systemd cgroup hierarchy. Ignore any named cgroups during // the lookup. // See #10602 for more details. procPath := fmt.Sprintf("/proc/%d/cgroup", c.state.PID) lines, err := ioutil.ReadFile(procPath) if err != nil { return "", err } var cgroupPath string for _, line := range bytes.Split(lines, []byte("\n")) { // cgroups(7) nails it down to three fields with the 3rd // pointing to the cgroup's path which works both on v1 and v2. fields := bytes.Split(line, []byte(":")) if len(fields) != 3 { logrus.Debugf("Error parsing cgroup: expected 3 fields but got %d: %s", len(fields), procPath) continue } // Ignore named cgroups like name=systemd. if bytes.Contains(fields[1], []byte("=")) { continue } path := string(fields[2]) if len(path) > len(cgroupPath) { cgroupPath = path } } if len(cgroupPath) == 0 { return "", errors.Errorf("could not find any cgroup in %q", procPath) } return cgroupPath, nil } // RootFsSize returns the root FS size of the container func (c *Container) RootFsSize() (int64, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return -1, errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.rootFsSize() } // RWSize returns the rw size of the container func (c *Container) RWSize() (int64, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return -1, errors.Wrapf(err, "error updating container %s state", c.ID()) } } return c.rwSize() } // IDMappings returns the UID/GID mapping used for the container func (c *Container) IDMappings() storage.IDMappingOptions { return c.config.IDMappings } // RootUID returns the root user mapping from container func (c *Container) RootUID() int { if len(c.config.IDMappings.UIDMap) == 1 && c.config.IDMappings.UIDMap[0].Size == 1 { return c.config.IDMappings.UIDMap[0].HostID } for _, uidmap := range c.config.IDMappings.UIDMap { if uidmap.ContainerID == 0 { return uidmap.HostID } } return 0 } // RootGID returns the root user mapping from container func (c *Container) RootGID() int { if len(c.config.IDMappings.GIDMap) == 1 && c.config.IDMappings.GIDMap[0].Size == 1 { return c.config.IDMappings.GIDMap[0].HostID } for _, gidmap := range c.config.IDMappings.GIDMap { if gidmap.ContainerID == 0 { return gidmap.HostID } } return 0 } // IsInfra returns whether the container is an infra container func (c *Container) IsInfra() bool { return c.config.IsInfra } // IsReadOnly returns whether the container is running in read only mode func (c *Container) IsReadOnly() bool { return c.config.Spec.Root.Readonly } // NetworkDisabled returns whether the container is running with a disabled network func (c *Container) NetworkDisabled() (bool, error) { if c.config.NetNsCtr != "" { container, err := c.runtime.state.Container(c.config.NetNsCtr) if err != nil { return false, err } return container.NetworkDisabled() } return networkDisabled(c) } func networkDisabled(c *Container) (bool, error) { if c.config.CreateNetNS { return false, nil } if !c.config.PostConfigureNetNS { for _, ns := range c.config.Spec.Linux.Namespaces { if ns.Type == spec.NetworkNamespace { return ns.Path == "", nil } } } return false, nil } func (c *Container) HostNetwork() bool { if c.config.CreateNetNS || c.config.NetNsCtr != "" { return false } for _, ns := range c.config.Spec.Linux.Namespaces { if ns.Type == spec.NetworkNamespace { return false } } return true } // ContainerState returns containerstate struct func (c *Container) ContainerState() (*ContainerState, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return nil, err } } returnConfig := new(ContainerState) if err := JSONDeepCopy(c.state, returnConfig); err != nil { return nil, errors.Wrapf(err, "error copying container %s state", c.ID()) } return c.state, nil } // HasHealthCheck returns bool as to whether there is a health check // defined for the container func (c *Container) HasHealthCheck() bool { return c.config.HealthCheckConfig != nil } // HealthCheckConfig returns the command and timing attributes of the health check func (c *Container) HealthCheckConfig() *manifest.Schema2HealthConfig { return c.config.HealthCheckConfig } // AutoRemove indicates whether the container will be removed after it is executed func (c *Container) AutoRemove() bool { spec := c.config.Spec if spec.Annotations == nil { return false } return c.Spec().Annotations[define.InspectAnnotationAutoremove] == define.InspectResponseTrue } // Timezone returns the timezone configured inside the container. // Local means it has the same timezone as the host machine func (c *Container) Timezone() string { return c.config.Timezone } // Umask returns the Umask bits configured inside the container. func (c *Container) Umask() string { return c.config.Umask } //Secrets return the secrets in the container func (c *Container) Secrets() []*ContainerSecret { return c.config.Secrets } // Networks gets all the networks this container is connected to. // Please do NOT use ctr.config.Networks, as this can be changed from those // values at runtime via network connect and disconnect. // If the container is configured to use CNI and this function returns an empty // array, the container will still be connected to the default network. // The second return parameter, a bool, indicates that the container container // is joining the default CNI network - the network name will be included in the // returned array of network names, but the container did not explicitly join // this network. func (c *Container) Networks() ([]string, bool, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return nil, false, err } } return c.networks() } // NetworkMode gets the configured network mode for the container. // Get actual value from the database func (c *Container) NetworkMode() string { networkMode := "" ctrSpec := c.config.Spec switch { case c.config.CreateNetNS: // We actually store the network // mode for Slirp and Bridge, so // we can just use that networkMode = string(c.config.NetMode) case c.config.NetNsCtr != "": networkMode = fmt.Sprintf("container:%s", c.config.NetNsCtr) default: // Find the spec's network namespace. // If there is none, it's host networking. // If there is one and it has a path, it's "ns:". foundNetNS := false for _, ns := range ctrSpec.Linux.Namespaces { if ns.Type == spec.NetworkNamespace { foundNetNS = true if ns.Path != "" { networkMode = fmt.Sprintf("ns:%s", ns.Path) } else { // We're making a network ns, but not // configuring with Slirp or CNI. That // means it's --net=none networkMode = "none" } break } } if !foundNetNS { networkMode = "host" } } return networkMode } // Unlocked accessor for networks func (c *Container) networks() ([]string, bool, error) { networks, err := c.runtime.state.GetNetworks(c) if err != nil && errors.Cause(err) == define.ErrNoSuchNetwork { if len(c.config.Networks) == 0 && c.config.NetMode.IsBridge() { return []string{c.runtime.netPlugin.GetDefaultNetworkName()}, true, nil } return c.config.Networks, false, nil } return networks, false, err } // networksByNameIndex provides us with a map of container networks where key // is network name and value is the index position func (c *Container) networksByNameIndex() (map[string]int, error) { networks, _, err := c.networks() if err != nil { return nil, err } networkNamesByIndex := make(map[string]int, len(networks)) for index, name := range networks { networkNamesByIndex[name] = index } return networkNamesByIndex, nil } // add puts the new given CNI network name into the tracking map // and assigns it a new integer based on the map length func (d ContainerNetworkDescriptions) add(networkName string) { d[networkName] = len(d) } // getInterfaceByName returns a formatted interface name for a given // network along with a bool as to whether the network existed func (d ContainerNetworkDescriptions) getInterfaceByName(networkName string) (string, bool) { val, exists := d[networkName] if !exists { return "", exists } return fmt.Sprintf("eth%d", val), exists }