package libpod import ( "context" "fmt" "sort" "time" "github.com/containers/podman/v3/libpod/define" "github.com/containers/podman/v3/libpod/lock" "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" ) // Pod represents a group of containers that are managed together. // Any operations on a Pod that access state must begin with a call to // updatePod(). // There is no guarantee that state exists in a readable state before this call, // and even if it does its contents will be out of date and must be refreshed // from the database.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 their callers handled this requirement. Generally speaking, if a // function takes the pod lock and accesses any part of state, it should // updatePod() immediately after locking. // Pod represents a group of containers that may share namespaces type Pod struct { config *PodConfig state *podState valid bool runtime *Runtime lock lock.Locker } // PodConfig represents a pod's static configuration type PodConfig struct { ID string `json:"id"` Name string `json:"name"` // Namespace the pod is in Namespace string `json:"namespace,omitempty"` Hostname string `json:"hostname,omitempty"` // Labels contains labels applied to the pod Labels map[string]string `json:"labels"` // CgroupParent contains the pod's CGroup parent CgroupParent string `json:"cgroupParent"` // UsePodCgroup indicates whether the pod will create its own CGroup and // join containers to it. // If true, all containers joined to the pod will use the pod cgroup as // their cgroup parent, and cannot set a different cgroup parent UsePodCgroup bool `json:"sharesCgroup,omitempty"` // The following UsePod{kernelNamespace} indicate whether the containers // in the pod will inherit the namespace from the first container in the pod. UsePodPID bool `json:"sharesPid,omitempty"` UsePodIPC bool `json:"sharesIpc,omitempty"` UsePodNet bool `json:"sharesNet,omitempty"` UsePodMount bool `json:"sharesMnt,omitempty"` UsePodUser bool `json:"sharesUser,omitempty"` UsePodUTS bool `json:"sharesUts,omitempty"` UsePodCgroupNS bool `json:"sharesCgroupNS,omitempty"` HasInfra bool `json:"hasInfra,omitempty"` // Time pod was created CreatedTime time.Time `json:"created"` // CreateCommand is the full command plus arguments of the process the // container has been created with. CreateCommand []string `json:"CreateCommand,omitempty"` // ID of the pod's lock LockID uint32 `json:"lockID"` } // podState represents a pod's state type podState struct { // CgroupPath is the path to the pod's CGroup CgroupPath string `json:"cgroupPath"` // InfraContainerID is the container that holds pod namespace information // Most often an infra container InfraContainerID string } // ID retrieves the pod's ID func (p *Pod) ID() string { return p.config.ID } // Name retrieves the pod's name func (p *Pod) Name() string { return p.config.Name } // Namespace returns the pod's libpod namespace. // Namespaces are used to logically separate containers and pods in the state. func (p *Pod) Namespace() string { return p.config.Namespace } // ResourceLim returns the cpuset resource limits for the pod func (p *Pod) ResourceLim() *specs.LinuxResources { resCopy := &specs.LinuxResources{} empty := &specs.LinuxResources{ CPU: &specs.LinuxCPU{}, } infra, err := p.runtime.GetContainer(p.state.InfraContainerID) if err != nil { return empty } conf := infra.config.Spec if err != nil { return empty } if conf.Linux == nil || conf.Linux.Resources == nil { return empty } if err = JSONDeepCopy(conf.Linux.Resources, resCopy); err != nil { return nil } if resCopy.CPU != nil { return resCopy } return empty } // CPUPeriod returns the pod CPU period func (p *Pod) CPUPeriod() uint64 { if p.state.InfraContainerID == "" { return 0 } infra, err := p.runtime.GetContainer(p.state.InfraContainerID) if err != nil { return 0 } conf := infra.config.Spec if conf != nil && conf.Linux != nil && conf.Linux.Resources != nil && conf.Linux.Resources.CPU != nil && conf.Linux.Resources.CPU.Period != nil { return *conf.Linux.Resources.CPU.Period } return 0 } // CPUQuota returns the pod CPU quota func (p *Pod) CPUQuota() int64 { if p.state.InfraContainerID == "" { return 0 } infra, err := p.runtime.GetContainer(p.state.InfraContainerID) if err != nil { return 0 } conf := infra.config.Spec if conf != nil && conf.Linux != nil && conf.Linux.Resources != nil && conf.Linux.Resources.CPU != nil && conf.Linux.Resources.CPU.Quota != nil { return *conf.Linux.Resources.CPU.Quota } return 0 } // PidMode returns the PID mode given by the user ex: pod, private... func (p *Pod) PidMode() string { infra, err := p.runtime.GetContainer(p.state.InfraContainerID) if err != nil { return "" } ctrSpec := infra.config.Spec if ctrSpec != nil && ctrSpec.Linux != nil { for _, ns := range ctrSpec.Linux.Namespaces { if ns.Type == specs.PIDNamespace { if ns.Path != "" { return fmt.Sprintf("ns:%s", ns.Path) } return "private" } } return "host" } return "" } // PidMode returns the PID mode given by the user ex: pod, private... func (p *Pod) UserNSMode() string { infra, err := p.infraContainer() if err != nil { return "" } ctrSpec := infra.config.Spec if ctrSpec != nil && ctrSpec.Linux != nil { for _, ns := range ctrSpec.Linux.Namespaces { if ns.Type == specs.UserNamespace { if ns.Path != "" { return fmt.Sprintf("ns:%s", ns.Path) } return "private" } } return "host" } return "" } // Labels returns the pod's labels func (p *Pod) Labels() map[string]string { labels := make(map[string]string) for key, value := range p.config.Labels { labels[key] = value } return labels } // CreatedTime gets the time when the pod was created func (p *Pod) CreatedTime() time.Time { return p.config.CreatedTime } // CreateCommand returns the os.Args of the process with which the pod has been // created. func (p *Pod) CreateCommand() []string { return p.config.CreateCommand } // CgroupParent returns the pod's CGroup parent func (p *Pod) CgroupParent() string { return p.config.CgroupParent } // SharesPID returns whether containers in pod // default to use PID namespace of first container in pod func (p *Pod) SharesPID() bool { return p.config.UsePodPID } // SharesIPC returns whether containers in pod // default to use IPC namespace of first container in pod func (p *Pod) SharesIPC() bool { return p.config.UsePodIPC } // SharesNet returns whether containers in pod // default to use network namespace of first container in pod func (p *Pod) SharesNet() bool { return p.config.UsePodNet } // SharesMount returns whether containers in pod // default to use PID namespace of first container in pod func (p *Pod) SharesMount() bool { return p.config.UsePodMount } // SharesUser returns whether containers in pod // default to use user namespace of first container in pod func (p *Pod) SharesUser() bool { return p.config.UsePodUser } // SharesUTS returns whether containers in pod // default to use UTS namespace of first container in pod func (p *Pod) SharesUTS() bool { return p.config.UsePodUTS } // SharesCgroup returns whether containers in the pod will default to this pod's // cgroup instead of the default libpod parent func (p *Pod) SharesCgroup() bool { return p.config.UsePodCgroupNS } // Hostname returns the hostname of the pod. func (p *Pod) Hostname() string { return p.config.Hostname } // CgroupPath returns the path to the pod's CGroup func (p *Pod) CgroupPath() (string, error) { p.lock.Lock() defer p.lock.Unlock() if err := p.updatePod(); err != nil { return "", err } if p.state.CgroupPath != "" { return p.state.CgroupPath, nil } if p.state.InfraContainerID == "" { return "", errors.Wrap(define.ErrNoSuchCtr, "pod has no infra container") } id, err := p.infraContainerID() if err != nil { return "", err } if id != "" { ctr, err := p.infraContainer() if err != nil { return "", errors.Wrapf(err, "could not get infra") } if ctr != nil { ctr.Start(context.Background(), true) cgroupPath, err := ctr.CGroupPath() fmt.Println(cgroupPath) if err != nil { return "", errors.Wrapf(err, "could not get container cgroup") } p.state.CgroupPath = cgroupPath p.save() return cgroupPath, nil } } return p.state.CgroupPath, nil } // HasContainer checks if a container is present in the pod func (p *Pod) HasContainer(id string) (bool, error) { if !p.valid { return false, define.ErrPodRemoved } return p.runtime.state.PodHasContainer(p, id) } // AllContainersByID returns the container IDs of all the containers in the pod func (p *Pod) AllContainersByID() ([]string, error) { p.lock.Lock() defer p.lock.Unlock() if !p.valid { return nil, define.ErrPodRemoved } return p.runtime.state.PodContainersByID(p) } // AllContainers retrieves the containers in the pod func (p *Pod) AllContainers() ([]*Container, error) { if !p.valid { return nil, define.ErrPodRemoved } p.lock.Lock() defer p.lock.Unlock() return p.allContainers() } func (p *Pod) allContainers() ([]*Container, error) { return p.runtime.state.PodContainers(p) } // HasInfraContainer returns whether the pod will create an infra container func (p *Pod) HasInfraContainer() bool { return p.config.HasInfra } // SharesNamespaces checks if the pod has any kernel namespaces set as shared. An infra container will not be // created if no kernel namespaces are shared. func (p *Pod) SharesNamespaces() bool { return p.SharesPID() || p.SharesIPC() || p.SharesNet() || p.SharesMount() || p.SharesUser() || p.SharesUTS() } // infraContainerID returns the infra ID without a lock func (p *Pod) infraContainerID() (string, error) { if err := p.updatePod(); err != nil { return "", err } return p.state.InfraContainerID, nil } // InfraContainerID returns the infra container ID for a pod. // If the container returned is "", the pod has no infra container. func (p *Pod) InfraContainerID() (string, error) { p.lock.Lock() defer p.lock.Unlock() return p.infraContainerID() } // infraContainer is the unlocked versio of InfraContainer which returns the infra container func (p *Pod) infraContainer() (*Container, error) { id, err := p.infraContainerID() if err != nil { return nil, err } if id == "" { return nil, errors.Wrap(define.ErrNoSuchCtr, "pod has no infra container") } return p.runtime.state.Container(id) } // InfraContainer returns the infra container. func (p *Pod) InfraContainer() (*Container, error) { p.lock.Lock() defer p.lock.Unlock() return p.infraContainer() } // TODO add pod batching // Lock pod to avoid lock contention // Store and lock all containers (no RemoveContainer in batch guarantees cache will not become stale) // PodContainerStats is an organization struct for pods and their containers type PodContainerStats struct { Pod *Pod ContainerStats map[string]*define.ContainerStats } // GetPodStats returns the stats for each of its containers func (p *Pod) GetPodStats(previousContainerStats map[string]*define.ContainerStats) (map[string]*define.ContainerStats, error) { var ( ok bool prevStat *define.ContainerStats ) p.lock.Lock() defer p.lock.Unlock() if err := p.updatePod(); err != nil { return nil, err } containers, err := p.runtime.state.PodContainers(p) if err != nil { return nil, err } newContainerStats := make(map[string]*define.ContainerStats) for _, c := range containers { if prevStat, ok = previousContainerStats[c.ID()]; !ok { prevStat = &define.ContainerStats{} } newStats, err := c.GetContainerStats(prevStat) // If the container wasn't running, don't include it // but also suppress the error if err != nil && errors.Cause(err) != define.ErrCtrStateInvalid { return nil, err } if err == nil { newContainerStats[c.ID()] = newStats } } return newContainerStats, nil } // ProcessLabel returns the SELinux label associated with the pod func (p *Pod) ProcessLabel() (string, error) { if !p.HasInfraContainer() { return "", nil } ctr, err := p.infraContainer() if err != nil { return "", err } return ctr.ProcessLabel(), nil } // initContainers returns the list of initcontainers // in a pod sorted by create time func (p *Pod) initContainers() ([]*Container, error) { initCons := make([]*Container, 0) // the pod is already locked when this is called cons, err := p.allContainers() if err != nil { return nil, err } // Sort the pod containers by created time sort.Slice(cons, func(i, j int) bool { return cons[i].CreatedTime().Before(cons[j].CreatedTime()) }) // Iterate sorted containers and add ids for any init containers for _, c := range cons { if len(c.config.InitContainerType) > 0 { initCons = append(initCons, c) } } return initCons, nil }