| // +build !windows |
| |
| package container // import "github.com/docker/docker/container" |
| |
| import ( |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| "syscall" |
| |
| "github.com/containerd/continuity/fs" |
| "github.com/docker/docker/api/types" |
| containertypes "github.com/docker/docker/api/types/container" |
| mounttypes "github.com/docker/docker/api/types/mount" |
| swarmtypes "github.com/docker/docker/api/types/swarm" |
| "github.com/docker/docker/pkg/mount" |
| "github.com/docker/docker/pkg/stringid" |
| "github.com/docker/docker/volume" |
| volumemounts "github.com/docker/docker/volume/mounts" |
| "github.com/opencontainers/selinux/go-selinux/label" |
| "github.com/pkg/errors" |
| "github.com/sirupsen/logrus" |
| "golang.org/x/sys/unix" |
| ) |
| |
| const ( |
| // DefaultStopTimeout sets the default time, in seconds, to wait |
| // for the graceful container stop before forcefully terminating it. |
| DefaultStopTimeout = 10 |
| |
| containerSecretMountPath = "/run/secrets" |
| ) |
| |
| // 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) |
| } |
| |
| // NetworkMounts returns the list of network mounts. |
| func (container *Container) NetworkMounts() []Mount { |
| var mounts []Mount |
| shared := container.HostConfig.NetworkMode.IsContainer() |
| parser := volumemounts.NewParser(container.OS) |
| 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 { |
| writable := !container.HostConfig.ReadonlyRootfs |
| if m, exists := container.MountPoints["/etc/resolv.conf"]; exists { |
| writable = m.RW |
| } else { |
| label.Relabel(container.ResolvConfPath, container.MountLabel, shared) |
| } |
| mounts = append(mounts, Mount{ |
| Source: container.ResolvConfPath, |
| Destination: "/etc/resolv.conf", |
| Writable: writable, |
| Propagation: string(parser.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 { |
| writable := !container.HostConfig.ReadonlyRootfs |
| if m, exists := container.MountPoints["/etc/hostname"]; exists { |
| writable = m.RW |
| } else { |
| label.Relabel(container.HostnamePath, container.MountLabel, shared) |
| } |
| mounts = append(mounts, Mount{ |
| Source: container.HostnamePath, |
| Destination: "/etc/hostname", |
| Writable: writable, |
| Propagation: string(parser.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 { |
| writable := !container.HostConfig.ReadonlyRootfs |
| if m, exists := container.MountPoints["/etc/hosts"]; exists { |
| writable = m.RW |
| } else { |
| label.Relabel(container.HostsPath, container.MountLabel, shared) |
| } |
| mounts = append(mounts, Mount{ |
| Source: container.HostsPath, |
| Destination: "/etc/hosts", |
| Writable: writable, |
| Propagation: string(parser.DefaultPropagationMode()), |
| }) |
| } |
| } |
| return mounts |
| } |
| |
| // CopyImagePathContent copies files in destination to the volume. |
| func (container *Container) CopyImagePathContent(v volume.Volume, destination string) error { |
| rootfs, err := container.GetResourcePath(destination) |
| if err != nil { |
| return err |
| } |
| |
| if _, err := os.Stat(rootfs); err != nil { |
| if os.IsNotExist(err) { |
| return nil |
| } |
| return err |
| } |
| |
| id := stringid.GenerateRandomID() |
| 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 != unix.ENOTSUP { |
| return err |
| } |
| return copyExistingContents(rootfs, path) |
| } |
| |
| // ShmResourcePath returns path to shm |
| func (container *Container) ShmResourcePath() (string, error) { |
| return container.MountsResourcePath("shm") |
| } |
| |
| // HasMountFor checks if path is a mountpoint |
| func (container *Container) HasMountFor(path string) bool { |
| _, exists := container.MountPoints[path] |
| if exists { |
| return true |
| } |
| |
| // Also search among the tmpfs mounts |
| for dest := range container.HostConfig.Tmpfs { |
| if dest == path { |
| return true |
| } |
| } |
| |
| return false |
| } |
| |
| // UnmountIpcMount unmounts shm if it was mounted |
| func (container *Container) UnmountIpcMount() error { |
| if container.HasMountFor("/dev/shm") { |
| return nil |
| } |
| |
| // container.ShmPath should not be used here as it may point |
| // to the host's or other container's /dev/shm |
| shmPath, err := container.ShmResourcePath() |
| if err != nil { |
| return err |
| } |
| if shmPath == "" { |
| return nil |
| } |
| if err = mount.Unmount(shmPath); err != nil && !os.IsNotExist(errors.Cause(err)) { |
| return err |
| } |
| return nil |
| } |
| |
| // IpcMounts returns the list of IPC mounts |
| func (container *Container) IpcMounts() []Mount { |
| var mounts []Mount |
| parser := volumemounts.NewParser(container.OS) |
| |
| if container.HasMountFor("/dev/shm") { |
| return mounts |
| } |
| if container.ShmPath == "" { |
| return mounts |
| } |
| |
| label.SetFileLabel(container.ShmPath, container.MountLabel) |
| mounts = append(mounts, Mount{ |
| Source: container.ShmPath, |
| Destination: "/dev/shm", |
| Writable: true, |
| Propagation: string(parser.DefaultPropagationMode()), |
| }) |
| |
| return mounts |
| } |
| |
| // SecretMounts returns the mounts for the secret path. |
| func (container *Container) SecretMounts() ([]Mount, error) { |
| var mounts []Mount |
| for _, r := range container.SecretReferences { |
| if r.File == nil { |
| continue |
| } |
| src, err := container.SecretFilePath(*r) |
| if err != nil { |
| return nil, err |
| } |
| mounts = append(mounts, Mount{ |
| Source: src, |
| Destination: getSecretTargetPath(r), |
| Writable: false, |
| }) |
| } |
| for _, r := range container.ConfigReferences { |
| fPath, err := container.ConfigFilePath(*r) |
| if err != nil { |
| return nil, err |
| } |
| mounts = append(mounts, Mount{ |
| Source: fPath, |
| Destination: r.File.Name, |
| Writable: false, |
| }) |
| } |
| |
| return mounts, nil |
| } |
| |
| // UnmountSecrets unmounts the local tmpfs for secrets |
| func (container *Container) UnmountSecrets() error { |
| p, err := container.SecretMountPath() |
| if err != nil { |
| return err |
| } |
| if _, err := os.Stat(p); err != nil { |
| if os.IsNotExist(err) { |
| return nil |
| } |
| return err |
| } |
| |
| return mount.RecursiveUnmount(p) |
| } |
| |
| type conflictingUpdateOptions string |
| |
| func (e conflictingUpdateOptions) Error() string { |
| return string(e) |
| } |
| |
| func (e conflictingUpdateOptions) Conflict() {} |
| |
| // UpdateContainer updates configuration of a container. Callers must hold a Lock on the Container. |
| func (container *Container) UpdateContainer(hostConfig *containertypes.HostConfig) error { |
| // update resources of container |
| resources := hostConfig.Resources |
| cResources := &container.HostConfig.Resources |
| |
| // validate NanoCPUs, CPUPeriod, and CPUQuota |
| // Because NanoCPU effectively updates CPUPeriod/CPUQuota, |
| // once NanoCPU is already set, updating CPUPeriod/CPUQuota will be blocked, and vice versa. |
| // In the following we make sure the intended update (resources) does not conflict with the existing (cResource). |
| if resources.NanoCPUs > 0 && cResources.CPUPeriod > 0 { |
| return conflictingUpdateOptions("Conflicting options: Nano CPUs cannot be updated as CPU Period has already been set") |
| } |
| if resources.NanoCPUs > 0 && cResources.CPUQuota > 0 { |
| return conflictingUpdateOptions("Conflicting options: Nano CPUs cannot be updated as CPU Quota has already been set") |
| } |
| if resources.CPUPeriod > 0 && cResources.NanoCPUs > 0 { |
| return conflictingUpdateOptions("Conflicting options: CPU Period cannot be updated as NanoCPUs has already been set") |
| } |
| if resources.CPUQuota > 0 && cResources.NanoCPUs > 0 { |
| return conflictingUpdateOptions("Conflicting options: CPU Quota cannot be updated as NanoCPUs has already been set") |
| } |
| |
| if resources.BlkioWeight != 0 { |
| cResources.BlkioWeight = resources.BlkioWeight |
| } |
| if resources.CPUShares != 0 { |
| cResources.CPUShares = resources.CPUShares |
| } |
| if resources.NanoCPUs != 0 { |
| cResources.NanoCPUs = resources.NanoCPUs |
| } |
| 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 { |
| // if memory limit smaller than already set memoryswap limit and doesn't |
| // update the memoryswap limit, then error out. |
| if resources.Memory > cResources.MemorySwap && resources.MemorySwap == 0 { |
| return conflictingUpdateOptions("Memory limit should be smaller than already set memoryswap limit, update the memoryswap at the same time") |
| } |
| 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 |
| } |
| if resources.CPURealtimePeriod != 0 { |
| cResources.CPURealtimePeriod = resources.CPURealtimePeriod |
| } |
| if resources.CPURealtimeRuntime != 0 { |
| cResources.CPURealtimeRuntime = resources.CPURealtimeRuntime |
| } |
| if resources.PidsLimit != nil { |
| cResources.PidsLimit = resources.PidsLimit |
| } |
| |
| // update HostConfig of container |
| if hostConfig.RestartPolicy.Name != "" { |
| if container.HostConfig.AutoRemove && !hostConfig.RestartPolicy.IsNone() { |
| return conflictingUpdateOptions("Restart policy cannot be updated because AutoRemove is enabled for the container") |
| } |
| container.HostConfig.RestartPolicy = hostConfig.RestartPolicy |
| } |
| |
| return nil |
| } |
| |
| // DetachAndUnmount uses a detached mount on all mount destinations, then |
| // unmounts each volume normally. |
| // This is used from daemon/archive for `docker cp` |
| func (container *Container) DetachAndUnmount(volumeEventLog func(name, action string, attributes map[string]string)) error { |
| networkMounts := container.NetworkMounts() |
| mountPaths := make([]string, 0, len(container.MountPoints)+len(networkMounts)) |
| |
| for _, mntPoint := range container.MountPoints { |
| dest, err := container.GetResourcePath(mntPoint.Destination) |
| if err != nil { |
| logrus.Warnf("Failed to get volume destination path for container '%s' at '%s' while lazily unmounting: %v", container.ID, mntPoint.Destination, err) |
| continue |
| } |
| mountPaths = append(mountPaths, dest) |
| } |
| |
| for _, m := range networkMounts { |
| dest, err := container.GetResourcePath(m.Destination) |
| if err != nil { |
| logrus.Warnf("Failed to get volume destination path for container '%s' at '%s' while lazily unmounting: %v", container.ID, m.Destination, err) |
| continue |
| } |
| mountPaths = append(mountPaths, dest) |
| } |
| |
| for _, mountPath := range mountPaths { |
| if err := mount.Unmount(mountPath); err != nil { |
| logrus.WithError(err).WithField("container", container.ID). |
| Warn("Unable to unmount") |
| } |
| } |
| return container.UnmountVolumes(volumeEventLog) |
| } |
| |
| // ignoreUnsupportedXAttrs ignores errors when extended attributes |
| // are not supported |
| func ignoreUnsupportedXAttrs() fs.CopyDirOpt { |
| xeh := func(dst, src, xattrKey string, err error) error { |
| if errors.Cause(err) != syscall.ENOTSUP { |
| return err |
| } |
| return nil |
| } |
| return fs.WithXAttrErrorHandler(xeh) |
| } |
| |
| // copyExistingContents copies from the source to the destination and |
| // ensures the ownership is appropriately set. |
| func copyExistingContents(source, destination string) error { |
| dstList, err := ioutil.ReadDir(destination) |
| if err != nil { |
| return err |
| } |
| if len(dstList) != 0 { |
| // destination is not empty, do not copy |
| return nil |
| } |
| return fs.CopyDir(destination, source, ignoreUnsupportedXAttrs()) |
| } |
| |
| // TmpfsMounts returns the list of tmpfs mounts |
| func (container *Container) TmpfsMounts() ([]Mount, error) { |
| parser := volumemounts.NewParser(container.OS) |
| var mounts []Mount |
| for dest, data := range container.HostConfig.Tmpfs { |
| mounts = append(mounts, Mount{ |
| Source: "tmpfs", |
| Destination: dest, |
| Data: data, |
| }) |
| } |
| for dest, mnt := range container.MountPoints { |
| if mnt.Type == mounttypes.TypeTmpfs { |
| data, err := parser.ConvertTmpfsOptions(mnt.Spec.TmpfsOptions, mnt.Spec.ReadOnly) |
| if err != nil { |
| return nil, err |
| } |
| mounts = append(mounts, Mount{ |
| Source: "tmpfs", |
| Destination: dest, |
| Data: data, |
| }) |
| } |
| } |
| return mounts, nil |
| } |
| |
| // GetMountPoints gives a platform specific transformation to types.MountPoint. Callers must hold a Container lock. |
| func (container *Container) GetMountPoints() []types.MountPoint { |
| mountPoints := make([]types.MountPoint, 0, len(container.MountPoints)) |
| for _, m := range container.MountPoints { |
| mountPoints = append(mountPoints, types.MountPoint{ |
| Type: m.Type, |
| Name: m.Name, |
| Source: m.Path(), |
| Destination: m.Destination, |
| Driver: m.Driver, |
| Mode: m.Mode, |
| RW: m.RW, |
| Propagation: m.Propagation, |
| }) |
| } |
| return mountPoints |
| } |
| |
| // ConfigFilePath returns the path to the on-disk location of a config. |
| // On unix, configs are always considered secret |
| func (container *Container) ConfigFilePath(configRef swarmtypes.ConfigReference) (string, error) { |
| mounts, err := container.SecretMountPath() |
| if err != nil { |
| return "", err |
| } |
| return filepath.Join(mounts, configRef.ConfigID), nil |
| } |