package libpod import ( "os" "path/filepath" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) const ctrRemoveTimeout = 10 // Contains the public Runtime API for containers // A CtrCreateOption is a functional option which alters the Container created // by NewContainer type CtrCreateOption func(*Container) error // ContainerFilter is a function to determine whether a container is included // in command output. Containers to be outputted are tested using the function. // A true return will include the container, a false return will exclude it. type ContainerFilter func(*Container) bool // NewContainer creates a new container from a given OCI config func (r *Runtime) NewContainer(spec *spec.Spec, options ...CtrCreateOption) (c *Container, err error) { r.lock.Lock() defer r.lock.Unlock() if !r.valid { return nil, ErrRuntimeStopped } ctr, err := newContainer(spec, r.lockDir) if err != nil { return nil, err } for _, option := range options { if err := option(ctr); err != nil { return nil, errors.Wrapf(err, "error running container create option") } } ctr.valid = true ctr.state.State = ContainerStateConfigured ctr.runtime = r // Set up storage for the container if err := ctr.setupStorage(); err != nil { return nil, errors.Wrapf(err, "error configuring storage for container") } defer func() { if err != nil { if err2 := ctr.teardownStorage(); err2 != nil { logrus.Errorf("Error removing partially-created container root filesystem: %s", err2) } } }() if ctr.config.ShmDir == "" { ctr.config.ShmDir = filepath.Join(ctr.bundlePath(), "shm") if err := os.MkdirAll(ctr.config.ShmDir, 0700); err != nil { if !os.IsExist(err) { return nil, errors.Wrapf(err, "unable to create shm %q dir", ctr.config.ShmDir) } } ctr.config.Mounts = append(ctr.config.Mounts, ctr.config.ShmDir) } // If the container is in a pod, add it to the pod if ctr.pod != nil { if err := ctr.pod.addContainer(ctr); err != nil { return nil, errors.Wrapf(err, "error adding new container to pod %s", ctr.pod.ID()) } } defer func() { if err != nil && ctr.pod != nil { if err2 := ctr.pod.removeContainer(ctr); err2 != nil { logrus.Errorf("Error removing partially-created container from pod %s: %s", ctr.pod.ID(), err2) } } }() if err := r.state.AddContainer(ctr); err != nil { // TODO: Might be worth making an effort to detect duplicate IDs and names // We can recover from that by generating a new ID for the // container return nil, errors.Wrapf(err, "error adding new container to state") } return ctr, nil } // RemoveContainer removes the given container // If force is specified, the container will be stopped first // Otherwise, RemoveContainer will return an error if the container is running func (r *Runtime) RemoveContainer(c *Container, force bool) error { r.lock.Lock() defer r.lock.Unlock() return r.removeContainer(c, force) } // Internal function to remove a container // Locks the container, but does not lock the runtime func (r *Runtime) removeContainer(c *Container, force bool) error { c.lock.Lock() defer c.lock.Unlock() if !r.valid { return ErrRuntimeStopped } // Update the container to get current state if err := c.syncContainer(); err != nil { return err } if c.state.State == ContainerStatePaused { return errors.Wrapf(ErrCtrStateInvalid, "container %s is paused, cannot remove until unpaused", c.ID()) } // Check that the container's in a good state to be removed if c.state.State == ContainerStateRunning && force { if err := r.ociRuntime.stopContainer(c, ctrRemoveTimeout); err != nil { return errors.Wrapf(err, "cannot remove container %s as it could not be stopped", c.ID()) } // Need to update container state to make sure we know it's stopped if err := c.syncContainer(); err != nil { return err } } else if !(c.state.State == ContainerStateConfigured || c.state.State == ContainerStateCreated || c.state.State == ContainerStateStopped) { return errors.Wrapf(ErrCtrStateInvalid, "cannot remove container %s as it is %s - running or paused containers cannot be removed", c.ID(), c.state.State.String()) } // Stop the container's storage if err := c.teardownStorage(); err != nil { return err } if err := r.state.RemoveContainer(c); err != nil { return errors.Wrapf(err, "error removing container from state") } // Delete the container if err := r.ociRuntime.deleteContainer(c); err != nil { return errors.Wrapf(err, "error removing container %s from runc", c.ID()) } // Set container as invalid so it can no longer be used c.valid = false // Remove container from pod, if it joined one if c.pod != nil { if err := c.pod.removeContainer(c); err != nil { return errors.Wrapf(err, "error removing container from pod %s", c.pod.ID()) } } return nil } // GetContainer retrieves a container by its ID func (r *Runtime) GetContainer(id string) (*Container, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return nil, ErrRuntimeStopped } return r.state.Container(id) } // HasContainer checks if a container with the given ID is present func (r *Runtime) HasContainer(id string) (bool, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return false, ErrRuntimeStopped } return r.state.HasContainer(id) } // LookupContainer looks up a container by its name or a partial ID // If a partial ID is not unique, an error will be returned func (r *Runtime) LookupContainer(idOrName string) (*Container, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return nil, ErrRuntimeStopped } return r.state.LookupContainer(idOrName) } // GetContainers retrieves all containers from the state // Filters can be provided which will determine what containers are included in // the output. Multiple filters are handled by ANDing their output, so only // containers matching all filters are returned func (r *Runtime) GetContainers(filters ...ContainerFilter) ([]*Container, error) { r.lock.RLock() defer r.lock.RUnlock() if !r.valid { return nil, ErrRuntimeStopped } ctrs, err := r.state.AllContainers() if err != nil { return nil, err } ctrsFiltered := make([]*Container, 0, len(ctrs)) for _, ctr := range ctrs { include := true for _, filter := range filters { include = include && filter(ctr) } if include { ctrsFiltered = append(ctrsFiltered, ctr) } } return ctrsFiltered, nil }