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