| // +build linux freebsd |
| |
| package container |
| |
| import ( |
| "fmt" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| "strings" |
| "syscall" |
| |
| "github.com/Sirupsen/logrus" |
| "github.com/docker/docker/pkg/chrootarchive" |
| "github.com/docker/docker/pkg/stringid" |
| "github.com/docker/docker/pkg/symlink" |
| "github.com/docker/docker/pkg/system" |
| "github.com/docker/docker/utils" |
| "github.com/docker/docker/volume" |
| containertypes "github.com/docker/engine-api/types/container" |
| "github.com/opencontainers/runc/libcontainer/label" |
| ) |
| |
| // DefaultSHMSize is the default size (64MB) of the SHM which will be mounted in the container |
| const DefaultSHMSize int64 = 67108864 |
| |
| // Container holds the fields specific to unixen implementations. |
| // See CommonContainer for standard fields common to all containers. |
| type Container struct { |
| CommonContainer |
| |
| // Fields below here are platform specific. |
| AppArmorProfile string |
| HostnamePath string |
| HostsPath string |
| ShmPath string |
| ResolvConfPath string |
| SeccompProfile string |
| NoNewPrivileges bool |
| } |
| |
| // ExitStatus provides exit reasons for a container. |
| type ExitStatus struct { |
| // The exit code with which the container exited. |
| ExitCode int |
| |
| // Whether the container encountered an OOM. |
| OOMKilled bool |
| } |
| |
| // CreateDaemonEnvironment returns the list of all environment variables given the list of |
| // environment variables related to links. |
| // Sets PATH, HOSTNAME and if container.Config.Tty is set: TERM. |
| // The defaults set here do not override the values in container.Config.Env |
| func (container *Container) CreateDaemonEnvironment(linkedEnv []string) []string { |
| // Setup environment |
| env := []string{ |
| "PATH=" + system.DefaultPathEnv, |
| "HOSTNAME=" + container.Config.Hostname, |
| } |
| if container.Config.Tty { |
| env = append(env, "TERM=xterm") |
| } |
| env = append(env, linkedEnv...) |
| // because the env on the container can override certain default values |
| // we need to replace the 'env' keys where they match and append anything |
| // else. |
| env = utils.ReplaceOrAppendEnvValues(env, container.Config.Env) |
| return env |
| } |
| |
| // TrySetNetworkMount attempts to set the network mounts given a provided destination and |
| // the path to use for it; return true if the given destination was a network mount file |
| func (container *Container) TrySetNetworkMount(destination string, path string) bool { |
| if destination == "/etc/resolv.conf" { |
| container.ResolvConfPath = path |
| return true |
| } |
| if destination == "/etc/hostname" { |
| container.HostnamePath = path |
| return true |
| } |
| if destination == "/etc/hosts" { |
| container.HostsPath = path |
| return true |
| } |
| |
| return false |
| } |
| |
| // BuildHostnameFile writes the container's hostname file. |
| func (container *Container) BuildHostnameFile() error { |
| hostnamePath, err := container.GetRootResourcePath("hostname") |
| if err != nil { |
| return err |
| } |
| container.HostnamePath = hostnamePath |
| return ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644) |
| } |
| |
| // appendNetworkMounts appends any network mounts to the array of mount points passed in |
| func appendNetworkMounts(container *Container, volumeMounts []volume.MountPoint) ([]volume.MountPoint, error) { |
| for _, mnt := range container.NetworkMounts() { |
| dest, err := container.GetResourcePath(mnt.Destination) |
| if err != nil { |
| return nil, err |
| } |
| volumeMounts = append(volumeMounts, volume.MountPoint{Destination: dest}) |
| } |
| return volumeMounts, nil |
| } |
| |
| // NetworkMounts returns the list of network mounts. |
| func (container *Container) NetworkMounts() []Mount { |
| var mounts []Mount |
| shared := container.HostConfig.NetworkMode.IsContainer() |
| if container.ResolvConfPath != "" { |
| if _, err := os.Stat(container.ResolvConfPath); err != nil { |
| logrus.Warnf("ResolvConfPath set to %q, but can't stat this filename (err = %v); skipping", container.ResolvConfPath, err) |
| } else { |
| if !container.HasMountFor("/etc/resolv.conf") { |
| label.Relabel(container.ResolvConfPath, container.MountLabel, shared) |
| } |
| writable := !container.HostConfig.ReadonlyRootfs |
| if m, exists := container.MountPoints["/etc/resolv.conf"]; exists { |
| writable = m.RW |
| } |
| mounts = append(mounts, Mount{ |
| Source: container.ResolvConfPath, |
| Destination: "/etc/resolv.conf", |
| Writable: writable, |
| Propagation: volume.DefaultPropagationMode, |
| }) |
| } |
| } |
| if container.HostnamePath != "" { |
| if _, err := os.Stat(container.HostnamePath); err != nil { |
| logrus.Warnf("HostnamePath set to %q, but can't stat this filename (err = %v); skipping", container.HostnamePath, err) |
| } else { |
| if !container.HasMountFor("/etc/hostname") { |
| label.Relabel(container.HostnamePath, container.MountLabel, shared) |
| } |
| writable := !container.HostConfig.ReadonlyRootfs |
| if m, exists := container.MountPoints["/etc/hostname"]; exists { |
| writable = m.RW |
| } |
| mounts = append(mounts, Mount{ |
| Source: container.HostnamePath, |
| Destination: "/etc/hostname", |
| Writable: writable, |
| Propagation: volume.DefaultPropagationMode, |
| }) |
| } |
| } |
| if container.HostsPath != "" { |
| if _, err := os.Stat(container.HostsPath); err != nil { |
| logrus.Warnf("HostsPath set to %q, but can't stat this filename (err = %v); skipping", container.HostsPath, err) |
| } else { |
| if !container.HasMountFor("/etc/hosts") { |
| label.Relabel(container.HostsPath, container.MountLabel, shared) |
| } |
| writable := !container.HostConfig.ReadonlyRootfs |
| if m, exists := container.MountPoints["/etc/hosts"]; exists { |
| writable = m.RW |
| } |
| mounts = append(mounts, Mount{ |
| Source: container.HostsPath, |
| Destination: "/etc/hosts", |
| Writable: writable, |
| Propagation: volume.DefaultPropagationMode, |
| }) |
| } |
| } |
| return mounts |
| } |
| |
| // CopyImagePathContent copies files in destination to the volume. |
| func (container *Container) CopyImagePathContent(v volume.Volume, destination string) error { |
| rootfs, err := symlink.FollowSymlinkInScope(filepath.Join(container.BaseFS, destination), container.BaseFS) |
| if err != nil { |
| return err |
| } |
| |
| if _, err = ioutil.ReadDir(rootfs); err != nil { |
| if os.IsNotExist(err) { |
| return nil |
| } |
| return err |
| } |
| |
| id := stringid.GenerateNonCryptoID() |
| path, err := v.Mount(id) |
| if err != nil { |
| return err |
| } |
| |
| defer func() { |
| if err := v.Unmount(id); err != nil { |
| logrus.Warnf("error while unmounting volume %s: %v", v.Name(), err) |
| } |
| }() |
| if err := label.Relabel(path, container.MountLabel, true); err != nil && err != syscall.ENOTSUP { |
| return err |
| } |
| return copyExistingContents(rootfs, path) |
| } |
| |
| // ShmResourcePath returns path to shm |
| func (container *Container) ShmResourcePath() (string, error) { |
| return container.GetRootResourcePath("shm") |
| } |
| |
| // HasMountFor checks if path is a mountpoint |
| func (container *Container) HasMountFor(path string) bool { |
| _, exists := container.MountPoints[path] |
| return exists |
| } |
| |
| // UnmountIpcMounts uses the provided unmount function to unmount shm and mqueue if they were mounted |
| func (container *Container) UnmountIpcMounts(unmount func(pth string) error) { |
| if container.HostConfig.IpcMode.IsContainer() || container.HostConfig.IpcMode.IsHost() { |
| return |
| } |
| |
| var warnings []string |
| |
| if !container.HasMountFor("/dev/shm") { |
| shmPath, err := container.ShmResourcePath() |
| if err != nil { |
| logrus.Error(err) |
| warnings = append(warnings, err.Error()) |
| } else if shmPath != "" { |
| if err := unmount(shmPath); err != nil && !os.IsNotExist(err) { |
| warnings = append(warnings, fmt.Sprintf("failed to umount %s: %v", shmPath, err)) |
| } |
| |
| } |
| } |
| |
| if len(warnings) > 0 { |
| logrus.Warnf("failed to cleanup ipc mounts:\n%v", strings.Join(warnings, "\n")) |
| } |
| } |
| |
| // IpcMounts returns the list of IPC mounts |
| func (container *Container) IpcMounts() []Mount { |
| var mounts []Mount |
| |
| if !container.HasMountFor("/dev/shm") { |
| label.SetFileLabel(container.ShmPath, container.MountLabel) |
| mounts = append(mounts, Mount{ |
| Source: container.ShmPath, |
| Destination: "/dev/shm", |
| Writable: true, |
| Propagation: volume.DefaultPropagationMode, |
| }) |
| } |
| |
| return mounts |
| } |
| |
| // UpdateContainer updates configuration of a container. |
| func (container *Container) UpdateContainer(hostConfig *containertypes.HostConfig) error { |
| container.Lock() |
| defer container.Unlock() |
| |
| // update resources of container |
| resources := hostConfig.Resources |
| cResources := &container.HostConfig.Resources |
| if resources.BlkioWeight != 0 { |
| cResources.BlkioWeight = resources.BlkioWeight |
| } |
| if resources.CPUShares != 0 { |
| cResources.CPUShares = resources.CPUShares |
| } |
| if resources.CPUPeriod != 0 { |
| cResources.CPUPeriod = resources.CPUPeriod |
| } |
| if resources.CPUQuota != 0 { |
| cResources.CPUQuota = resources.CPUQuota |
| } |
| if resources.CpusetCpus != "" { |
| cResources.CpusetCpus = resources.CpusetCpus |
| } |
| if resources.CpusetMems != "" { |
| cResources.CpusetMems = resources.CpusetMems |
| } |
| if resources.Memory != 0 { |
| cResources.Memory = resources.Memory |
| } |
| if resources.MemorySwap != 0 { |
| cResources.MemorySwap = resources.MemorySwap |
| } |
| if resources.MemoryReservation != 0 { |
| cResources.MemoryReservation = resources.MemoryReservation |
| } |
| if resources.KernelMemory != 0 { |
| cResources.KernelMemory = resources.KernelMemory |
| } |
| |
| // update HostConfig of container |
| if hostConfig.RestartPolicy.Name != "" { |
| container.HostConfig.RestartPolicy = hostConfig.RestartPolicy |
| } |
| |
| if err := container.ToDisk(); err != nil { |
| logrus.Errorf("Error saving updated container: %v", err) |
| return err |
| } |
| |
| return nil |
| } |
| |
| func detachMounted(path string) error { |
| return syscall.Unmount(path, syscall.MNT_DETACH) |
| } |
| |
| // UnmountVolumes unmounts all volumes |
| func (container *Container) UnmountVolumes(forceSyscall bool, volumeEventLog func(name, action string, attributes map[string]string)) error { |
| var ( |
| volumeMounts []volume.MountPoint |
| err error |
| ) |
| |
| for _, mntPoint := range container.MountPoints { |
| dest, err := container.GetResourcePath(mntPoint.Destination) |
| if err != nil { |
| return err |
| } |
| |
| volumeMounts = append(volumeMounts, volume.MountPoint{Destination: dest, Volume: mntPoint.Volume, ID: mntPoint.ID}) |
| } |
| |
| // Append any network mounts to the list (this is a no-op on Windows) |
| if volumeMounts, err = appendNetworkMounts(container, volumeMounts); err != nil { |
| return err |
| } |
| |
| for _, volumeMount := range volumeMounts { |
| if forceSyscall { |
| if err := detachMounted(volumeMount.Destination); err != nil { |
| logrus.Warnf("%s unmountVolumes: Failed to do lazy umount %v", container.ID, err) |
| } |
| } |
| |
| if volumeMount.Volume != nil { |
| if err := volumeMount.Volume.Unmount(volumeMount.ID); err != nil { |
| return err |
| } |
| volumeMount.ID = "" |
| |
| attributes := map[string]string{ |
| "driver": volumeMount.Volume.DriverName(), |
| "container": container.ID, |
| } |
| volumeEventLog(volumeMount.Volume.Name(), "unmount", attributes) |
| } |
| } |
| |
| return nil |
| } |
| |
| // copyExistingContents copies from the source to the destination and |
| // ensures the ownership is appropriately set. |
| func copyExistingContents(source, destination string) error { |
| volList, err := ioutil.ReadDir(source) |
| if err != nil { |
| return err |
| } |
| if len(volList) > 0 { |
| srcList, err := ioutil.ReadDir(destination) |
| if err != nil { |
| return err |
| } |
| if len(srcList) == 0 { |
| // If the source volume is empty, copies files from the root into the volume |
| if err := chrootarchive.CopyWithTar(source, destination); err != nil { |
| return err |
| } |
| } |
| } |
| return copyOwnership(source, destination) |
| } |
| |
| // copyOwnership copies the permissions and uid:gid of the source file |
| // to the destination file |
| func copyOwnership(source, destination string) error { |
| stat, err := system.Stat(source) |
| if err != nil { |
| return err |
| } |
| |
| if err := os.Chown(destination, int(stat.UID()), int(stat.GID())); err != nil { |
| return err |
| } |
| |
| return os.Chmod(destination, os.FileMode(stat.Mode())) |
| } |
| |
| // TmpfsMounts returns the list of tmpfs mounts |
| func (container *Container) TmpfsMounts() []Mount { |
| var mounts []Mount |
| for dest, data := range container.HostConfig.Tmpfs { |
| mounts = append(mounts, Mount{ |
| Source: "tmpfs", |
| Destination: dest, |
| Data: data, |
| }) |
| } |
| return mounts |
| } |
| |
| // cleanResourcePath cleans a resource path and prepares to combine with mnt path |
| func cleanResourcePath(path string) string { |
| return filepath.Join(string(os.PathSeparator), path) |
| } |
| |
| // canMountFS determines if the file system for the container |
| // can be mounted locally. A no-op on non-Windows platforms |
| func (container *Container) canMountFS() bool { |
| return true |
| } |