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package docker
import (
"bytes"
"encoding/json"
"errors"
"flag"
"fmt"
"github.com/dotcloud/docker/archive"
"github.com/dotcloud/docker/term"
"github.com/dotcloud/docker/utils"
"github.com/kr/pty"
"io"
"io/ioutil"
"log"
"net"
"os"
"os/exec"
"path"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
)
type Container struct {
root string
ID string
Created time.Time
Path string
Args []string
Config *Config
State State
Image string
network *NetworkInterface
NetworkSettings *NetworkSettings
SysInitPath string
ResolvConfPath string
HostnamePath string
HostsPath string
Name string
cmd *exec.Cmd
stdout *utils.WriteBroadcaster
stderr *utils.WriteBroadcaster
stdin io.ReadCloser
stdinPipe io.WriteCloser
ptyMaster io.Closer
runtime *Runtime
waitLock chan struct{}
Volumes map[string]string
// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
// Easier than migrating older container configs :)
VolumesRW map[string]bool
hostConfig *HostConfig
activeLinks map[string]*Link
}
// Note: the Config structure should hold only portable information about the container.
// Here, "portable" means "independent from the host we are running on".
// Non-portable information *should* appear in HostConfig.
type Config struct {
Hostname string
Domainname string
User string
Memory int64 // Memory limit (in bytes)
MemorySwap int64 // Total memory usage (memory + swap); set `-1' to disable swap
CpuShares int64 // CPU shares (relative weight vs. other containers)
AttachStdin bool
AttachStdout bool
AttachStderr bool
PortSpecs []string // Deprecated - Can be in the format of 8080/tcp
ExposedPorts map[Port]struct{}
Tty bool // Attach standard streams to a tty, including stdin if it is not closed.
OpenStdin bool // Open stdin
StdinOnce bool // If true, close stdin after the 1 attached client disconnects.
Env []string
Cmd []string
Dns []string
Image string // Name of the image as it was passed by the operator (eg. could be symbolic)
Volumes map[string]struct{}
VolumesFrom string
WorkingDir string
Entrypoint []string
NetworkDisabled bool
}
type HostConfig struct {
Binds []string
ContainerIDFile string
LxcConf []KeyValuePair
Privileged bool
PortBindings map[Port][]PortBinding
Links []string
PublishAllPorts bool
}
type BindMap struct {
SrcPath string
DstPath string
Mode string
}
var (
ErrContainerStart = errors.New("The container failed to start. Unkown error")
ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.")
ErrInvalidWorikingDirectory = errors.New("The working directory is invalid. It needs to be an absolute path.")
ErrConflictAttachDetach = errors.New("Conflicting options: -a and -d")
ErrConflictDetachAutoRemove = errors.New("Conflicting options: -rm and -d")
)
type KeyValuePair struct {
Key string
Value string
}
type PortBinding struct {
HostIp string
HostPort string
}
// 80/tcp
type Port string
func (p Port) Proto() string {
parts := strings.Split(string(p), "/")
if len(parts) == 1 {
return "tcp"
}
return parts[1]
}
func (p Port) Port() string {
return strings.Split(string(p), "/")[0]
}
func (p Port) Int() int {
i, err := parsePort(p.Port())
if err != nil {
panic(err)
}
return i
}
func NewPort(proto, port string) Port {
return Port(fmt.Sprintf("%s/%s", port, proto))
}
func ParseRun(args []string, capabilities *Capabilities) (*Config, *HostConfig, *flag.FlagSet, error) {
cmd := Subcmd("run", "[OPTIONS] IMAGE [COMMAND] [ARG...]", "Run a command in a new container")
if os.Getenv("TEST") != "" {
cmd.SetOutput(ioutil.Discard)
cmd.Usage = nil
}
flHostname := cmd.String("h", "", "Container host name")
flWorkingDir := cmd.String("w", "", "Working directory inside the container")
flUser := cmd.String("u", "", "Username or UID")
flDetach := cmd.Bool("d", false, "Detached mode: Run container in the background, print new container id")
flAttach := NewAttachOpts()
cmd.Var(flAttach, "a", "Attach to stdin, stdout or stderr.")
flStdin := cmd.Bool("i", false, "Keep stdin open even if not attached")
flTty := cmd.Bool("t", false, "Allocate a pseudo-tty")
flMemoryString := cmd.String("m", "", "Memory limit (format: <number><optional unit>, where unit = b, k, m or g)")
flContainerIDFile := cmd.String("cidfile", "", "Write the container ID to the file")
flNetwork := cmd.Bool("n", true, "Enable networking for this container")
flPrivileged := cmd.Bool("privileged", false, "Give extended privileges to this container")
flAutoRemove := cmd.Bool("rm", false, "Automatically remove the container when it exits (incompatible with -d)")
cmd.Bool("sig-proxy", true, "Proxify all received signal to the process (even in non-tty mode)")
cmd.String("name", "", "Assign a name to the container")
flPublishAll := cmd.Bool("P", false, "Publish all exposed ports to the host interfaces")
if capabilities != nil && *flMemoryString != "" && !capabilities.MemoryLimit {
//fmt.Fprintf(stdout, "WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.\n")
*flMemoryString = ""
}
flCpuShares := cmd.Int64("c", 0, "CPU shares (relative weight)")
var flPublish utils.ListOpts
cmd.Var(&flPublish, "p", "Publish a container's port to the host (use 'docker port' to see the actual mapping)")
var flExpose utils.ListOpts
cmd.Var(&flExpose, "expose", "Expose a port from the container without publishing it to your host")
var flEnv utils.ListOpts
cmd.Var(&flEnv, "e", "Set environment variables")
var flDns utils.ListOpts
cmd.Var(&flDns, "dns", "Set custom dns servers")
flVolumes := NewPathOpts()
cmd.Var(flVolumes, "v", "Bind mount a volume (e.g. from the host: -v /host:/container, from docker: -v /container)")
var flVolumesFrom utils.ListOpts
cmd.Var(&flVolumesFrom, "volumes-from", "Mount volumes from the specified container(s)")
flEntrypoint := cmd.String("entrypoint", "", "Overwrite the default entrypoint of the image")
var flLxcOpts utils.ListOpts
cmd.Var(&flLxcOpts, "lxc-conf", "Add custom lxc options -lxc-conf=\"lxc.cgroup.cpuset.cpus = 0,1\"")
var flLinks utils.ListOpts
cmd.Var(&flLinks, "link", "Add link to another container (name:alias)")
if err := cmd.Parse(args); err != nil {
return nil, nil, cmd, err
}
if *flDetach && len(flAttach) > 0 {
return nil, nil, cmd, ErrConflictAttachDetach
}
if *flWorkingDir != "" && !path.IsAbs(*flWorkingDir) {
return nil, nil, cmd, ErrInvalidWorikingDirectory
}
if *flDetach && *flAutoRemove {
return nil, nil, cmd, ErrConflictDetachAutoRemove
}
// If neither -d or -a are set, attach to everything by default
if len(flAttach) == 0 && !*flDetach {
if !*flDetach {
flAttach.Set("stdout")
flAttach.Set("stderr")
if *flStdin {
flAttach.Set("stdin")
}
}
}
envs := []string{}
for _, env := range flEnv {
arr := strings.Split(env, "=")
if len(arr) > 1 {
envs = append(envs, env)
} else {
v := os.Getenv(env)
envs = append(envs, env+"="+v)
}
}
var flMemory int64
if *flMemoryString != "" {
parsedMemory, err := utils.RAMInBytes(*flMemoryString)
if err != nil {
return nil, nil, cmd, err
}
flMemory = parsedMemory
}
var binds []string
// add any bind targets to the list of container volumes
for bind := range flVolumes {
arr := strings.Split(bind, ":")
if len(arr) > 1 {
if arr[0] == "/" {
return nil, nil, cmd, fmt.Errorf("Invalid bind mount: source can't be '/'")
}
dstDir := arr[1]
flVolumes[dstDir] = struct{}{}
binds = append(binds, bind)
delete(flVolumes, bind)
}
}
parsedArgs := cmd.Args()
runCmd := []string{}
entrypoint := []string{}
image := ""
if len(parsedArgs) >= 1 {
image = cmd.Arg(0)
}
if len(parsedArgs) > 1 {
runCmd = parsedArgs[1:]
}
if *flEntrypoint != "" {
entrypoint = []string{*flEntrypoint}
}
var lxcConf []KeyValuePair
lxcConf, err := parseLxcConfOpts(flLxcOpts)
if err != nil {
return nil, nil, cmd, err
}
hostname := *flHostname
domainname := ""
parts := strings.SplitN(hostname, ".", 2)
if len(parts) > 1 {
hostname = parts[0]
domainname = parts[1]
}
ports, portBindings, err := parsePortSpecs(flPublish)
if err != nil {
return nil, nil, cmd, err
}
// Merge in exposed ports to the map of published ports
for _, e := range flExpose {
if strings.Contains(e, ":") {
return nil, nil, cmd, fmt.Errorf("Invalid port format for -expose: %s", e)
}
p := NewPort(splitProtoPort(e))
if _, exists := ports[p]; !exists {
ports[p] = struct{}{}
}
}
config := &Config{
Hostname: hostname,
Domainname: domainname,
PortSpecs: nil, // Deprecated
ExposedPorts: ports,
User: *flUser,
Tty: *flTty,
NetworkDisabled: !*flNetwork,
OpenStdin: *flStdin,
Memory: flMemory,
CpuShares: *flCpuShares,
AttachStdin: flAttach.Get("stdin"),
AttachStdout: flAttach.Get("stdout"),
AttachStderr: flAttach.Get("stderr"),
Env: envs,
Cmd: runCmd,
Dns: flDns,
Image: image,
Volumes: flVolumes,
VolumesFrom: strings.Join(flVolumesFrom, ","),
Entrypoint: entrypoint,
WorkingDir: *flWorkingDir,
}
hostConfig := &HostConfig{
Binds: binds,
ContainerIDFile: *flContainerIDFile,
LxcConf: lxcConf,
Privileged: *flPrivileged,
PortBindings: portBindings,
Links: flLinks,
PublishAllPorts: *flPublishAll,
}
if capabilities != nil && flMemory > 0 && !capabilities.SwapLimit {
//fmt.Fprintf(stdout, "WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n")
config.MemorySwap = -1
}
// When allocating stdin in attached mode, close stdin at client disconnect
if config.OpenStdin && config.AttachStdin {
config.StdinOnce = true
}
return config, hostConfig, cmd, nil
}
type PortMapping map[string]string // Deprecated
type NetworkSettings struct {
IPAddress string
IPPrefixLen int
Gateway string
Bridge string
PortMapping map[string]PortMapping // Deprecated
Ports map[Port][]PortBinding
}
func (settings *NetworkSettings) PortMappingAPI() []APIPort {
var mapping []APIPort
for port, bindings := range settings.Ports {
p, _ := parsePort(port.Port())
if len(bindings) == 0 {
mapping = append(mapping, APIPort{
PublicPort: int64(p),
Type: port.Proto(),
})
continue
}
for _, binding := range bindings {
p, _ := parsePort(port.Port())
h, _ := parsePort(binding.HostPort)
mapping = append(mapping, APIPort{
PrivatePort: int64(p),
PublicPort: int64(h),
Type: port.Proto(),
IP: binding.HostIp,
})
}
}
return mapping
}
// Inject the io.Reader at the given path. Note: do not close the reader
func (container *Container) Inject(file io.Reader, pth string) error {
// Return error if path exists
if _, err := os.Stat(path.Join(container.rwPath(), pth)); err == nil {
// Since err is nil, the path could be stat'd and it exists
return fmt.Errorf("%s exists", pth)
} else if !os.IsNotExist(err) {
// Expect err might be that the file doesn't exist, so
// if it's some other error, return that.
return err
}
// Make sure the directory exists
if err := os.MkdirAll(path.Join(container.rwPath(), path.Dir(pth)), 0755); err != nil {
return err
}
dest, err := os.Create(path.Join(container.rwPath(), pth))
if err != nil {
return err
}
if _, err := io.Copy(dest, file); err != nil {
return err
}
return nil
}
func (container *Container) Cmd() *exec.Cmd {
return container.cmd
}
func (container *Container) When() time.Time {
return container.Created
}
func (container *Container) FromDisk() error {
data, err := ioutil.ReadFile(container.jsonPath())
if err != nil {
return err
}
// Load container settings
// udp broke compat of docker.PortMapping, but it's not used when loading a container, we can skip it
if err := json.Unmarshal(data, container); err != nil && !strings.Contains(err.Error(), "docker.PortMapping") {
return err
}
return container.readHostConfig()
}
func (container *Container) ToDisk() (err error) {
data, err := json.Marshal(container)
if err != nil {
return
}
err = ioutil.WriteFile(container.jsonPath(), data, 0666)
if err != nil {
return
}
return container.writeHostConfig()
}
func (container *Container) readHostConfig() error {
container.hostConfig = &HostConfig{}
// If the hostconfig file does not exist, do not read it.
// (We still have to initialize container.hostConfig,
// but that's OK, since we just did that above.)
_, err := os.Stat(container.hostConfigPath())
if os.IsNotExist(err) {
return nil
}
data, err := ioutil.ReadFile(container.hostConfigPath())
if err != nil {
return err
}
return json.Unmarshal(data, container.hostConfig)
}
func (container *Container) writeHostConfig() (err error) {
data, err := json.Marshal(container.hostConfig)
if err != nil {
return
}
return ioutil.WriteFile(container.hostConfigPath(), data, 0666)
}
func (container *Container) generateEnvConfig(env []string) error {
data, err := json.Marshal(env)
if err != nil {
return err
}
ioutil.WriteFile(container.EnvConfigPath(), data, 0600)
return nil
}
func (container *Container) generateLXCConfig() error {
fo, err := os.Create(container.lxcConfigPath())
if err != nil {
return err
}
defer fo.Close()
return LxcTemplateCompiled.Execute(fo, container)
}
func (container *Container) startPty() error {
ptyMaster, ptySlave, err := pty.Open()
if err != nil {
return err
}
container.ptyMaster = ptyMaster
container.cmd.Stdout = ptySlave
container.cmd.Stderr = ptySlave
// Copy the PTYs to our broadcasters
go func() {
defer container.stdout.CloseWriters()
utils.Debugf("startPty: begin of stdout pipe")
io.Copy(container.stdout, ptyMaster)
utils.Debugf("startPty: end of stdout pipe")
}()
// stdin
if container.Config.OpenStdin {
container.cmd.Stdin = ptySlave
container.cmd.SysProcAttr.Setctty = true
go func() {
defer container.stdin.Close()
utils.Debugf("startPty: begin of stdin pipe")
io.Copy(ptyMaster, container.stdin)
utils.Debugf("startPty: end of stdin pipe")
}()
}
if err := container.cmd.Start(); err != nil {
return err
}
ptySlave.Close()
return nil
}
func (container *Container) start() error {
container.cmd.Stdout = container.stdout
container.cmd.Stderr = container.stderr
if container.Config.OpenStdin {
stdin, err := container.cmd.StdinPipe()
if err != nil {
return err
}
go func() {
defer stdin.Close()
utils.Debugf("start: begin of stdin pipe")
io.Copy(stdin, container.stdin)
utils.Debugf("start: end of stdin pipe")
}()
}
return container.cmd.Start()
}
func (container *Container) Attach(stdin io.ReadCloser, stdinCloser io.Closer, stdout io.Writer, stderr io.Writer) chan error {
var cStdout, cStderr io.ReadCloser
var nJobs int
errors := make(chan error, 3)
if stdin != nil && container.Config.OpenStdin {
nJobs += 1
if cStdin, err := container.StdinPipe(); err != nil {
errors <- err
} else {
go func() {
utils.Debugf("attach: stdin: begin")
defer utils.Debugf("attach: stdin: end")
// No matter what, when stdin is closed (io.Copy unblock), close stdout and stderr
if container.Config.StdinOnce && !container.Config.Tty {
defer cStdin.Close()
} else {
if cStdout != nil {
defer cStdout.Close()
}
if cStderr != nil {
defer cStderr.Close()
}
}
if container.Config.Tty {
_, err = utils.CopyEscapable(cStdin, stdin)
} else {
_, err = io.Copy(cStdin, stdin)
}
if err == io.ErrClosedPipe {
err = nil
}
if err != nil {
utils.Errorf("attach: stdin: %s", err)
}
errors <- err
}()
}
}
if stdout != nil {
nJobs += 1
if p, err := container.StdoutPipe(); err != nil {
errors <- err
} else {
cStdout = p
go func() {
utils.Debugf("attach: stdout: begin")
defer utils.Debugf("attach: stdout: end")
// If we are in StdinOnce mode, then close stdin
if container.Config.StdinOnce && stdin != nil {
defer stdin.Close()
}
if stdinCloser != nil {
defer stdinCloser.Close()
}
_, err := io.Copy(stdout, cStdout)
if err == io.ErrClosedPipe {
err = nil
}
if err != nil {
utils.Errorf("attach: stdout: %s", err)
}
errors <- err
}()
}
} else {
go func() {
if stdinCloser != nil {
defer stdinCloser.Close()
}
if cStdout, err := container.StdoutPipe(); err != nil {
utils.Errorf("attach: stdout pipe: %s", err)
} else {
io.Copy(&utils.NopWriter{}, cStdout)
}
}()
}
if stderr != nil {
nJobs += 1
if p, err := container.StderrPipe(); err != nil {
errors <- err
} else {
cStderr = p
go func() {
utils.Debugf("attach: stderr: begin")
defer utils.Debugf("attach: stderr: end")
// If we are in StdinOnce mode, then close stdin
if container.Config.StdinOnce && stdin != nil {
defer stdin.Close()
}
if stdinCloser != nil {
defer stdinCloser.Close()
}
_, err := io.Copy(stderr, cStderr)
if err == io.ErrClosedPipe {
err = nil
}
if err != nil {
utils.Errorf("attach: stderr: %s", err)
}
errors <- err
}()
}
} else {
go func() {
if stdinCloser != nil {
defer stdinCloser.Close()
}
if cStderr, err := container.StderrPipe(); err != nil {
utils.Errorf("attach: stdout pipe: %s", err)
} else {
io.Copy(&utils.NopWriter{}, cStderr)
}
}()
}
return utils.Go(func() error {
if cStdout != nil {
defer cStdout.Close()
}
if cStderr != nil {
defer cStderr.Close()
}
// FIXME: how to clean up the stdin goroutine without the unwanted side effect
// of closing the passed stdin? Add an intermediary io.Pipe?
for i := 0; i < nJobs; i += 1 {
utils.Debugf("attach: waiting for job %d/%d", i+1, nJobs)
if err := <-errors; err != nil {
utils.Errorf("attach: job %d returned error %s, aborting all jobs", i+1, err)
return err
}
utils.Debugf("attach: job %d completed successfully", i+1)
}
utils.Debugf("attach: all jobs completed successfully")
return nil
})
}
func (container *Container) Start() (err error) {
container.State.Lock()
defer container.State.Unlock()
if container.State.Running {
return fmt.Errorf("The container %s is already running.", container.ID)
}
defer func() {
if err != nil {
container.cleanup()
}
}()
if err := container.EnsureMounted(); err != nil {
return err
}
if container.runtime.networkManager.disabled {
container.Config.NetworkDisabled = true
container.buildHostnameAndHostsFiles("127.0.1.1")
} else {
if err := container.allocateNetwork(); err != nil {
return err
}
container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress)
}
// Make sure the config is compatible with the current kernel
if container.Config.Memory > 0 && !container.runtime.capabilities.MemoryLimit {
log.Printf("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.\n")
container.Config.Memory = 0
}
if container.Config.Memory > 0 && !container.runtime.capabilities.SwapLimit {
log.Printf("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n")
container.Config.MemorySwap = -1
}
if container.runtime.capabilities.IPv4ForwardingDisabled {
log.Printf("WARNING: IPv4 forwarding is disabled. Networking will not work")
}
// Create the requested bind mounts
binds := make(map[string]BindMap)
// Define illegal container destinations
illegalDsts := []string{"/", "."}
for _, bind := range container.hostConfig.Binds {
// FIXME: factorize bind parsing in parseBind
var src, dst, mode string
arr := strings.Split(bind, ":")
if len(arr) == 2 {
src = arr[0]
dst = arr[1]
mode = "rw"
} else if len(arr) == 3 {
src = arr[0]
dst = arr[1]
mode = arr[2]
} else {
return fmt.Errorf("Invalid bind specification: %s", bind)
}
// Bail if trying to mount to an illegal destination
for _, illegal := range illegalDsts {
if dst == illegal {
return fmt.Errorf("Illegal bind destination: %s", dst)
}
}
bindMap := BindMap{
SrcPath: src,
DstPath: dst,
Mode: mode,
}
binds[path.Clean(dst)] = bindMap
}
if container.Volumes == nil || len(container.Volumes) == 0 {
container.Volumes = make(map[string]string)
container.VolumesRW = make(map[string]bool)
}
// Apply volumes from another container if requested
if container.Config.VolumesFrom != "" {
containerSpecs := strings.Split(container.Config.VolumesFrom, ",")
for _, containerSpec := range containerSpecs {
mountRW := true
specParts := strings.SplitN(containerSpec, ":", 2)
switch len(specParts) {
case 0:
return fmt.Errorf("Malformed volumes-from specification: %s", container.Config.VolumesFrom)
case 2:
switch specParts[1] {
case "ro":
mountRW = false
case "rw": // mountRW is already true
default:
return fmt.Errorf("Malformed volumes-from speficication: %s", containerSpec)
}
}
c := container.runtime.Get(specParts[0])
if c == nil {
return fmt.Errorf("Container %s not found. Impossible to mount its volumes", container.ID)
}
for volPath, id := range c.Volumes {
if _, exists := container.Volumes[volPath]; exists {
continue
}
if err := os.MkdirAll(path.Join(container.RootfsPath(), volPath), 0755); err != nil {
return err
}
container.Volumes[volPath] = id
if isRW, exists := c.VolumesRW[volPath]; exists {
container.VolumesRW[volPath] = isRW && mountRW
}
}
}
}
// Create the requested volumes if they don't exist
for volPath := range container.Config.Volumes {
volPath = path.Clean(volPath)
// Skip existing volumes
if _, exists := container.Volumes[volPath]; exists {
continue
}
var srcPath string
var isBindMount bool
srcRW := false
// If an external bind is defined for this volume, use that as a source
if bindMap, exists := binds[volPath]; exists {
isBindMount = true
srcPath = bindMap.SrcPath
if strings.ToLower(bindMap.Mode) == "rw" {
srcRW = true
}
// Otherwise create an directory in $ROOT/volumes/ and use that
} else {
c, err := container.runtime.volumes.Create(nil, container, "", "", nil)
if err != nil {
return err
}
srcPath, err = c.layer()
if err != nil {
return err
}
srcRW = true // RW by default
}
container.Volumes[volPath] = srcPath
container.VolumesRW[volPath] = srcRW
// Create the mountpoint
rootVolPath := path.Join(container.RootfsPath(), volPath)
if err := os.MkdirAll(rootVolPath, 0755); err != nil {
return err
}
// Do not copy or change permissions if we are mounting from the host
if srcRW && !isBindMount {
volList, err := ioutil.ReadDir(rootVolPath)
if err != nil {
return err
}
if len(volList) > 0 {
srcList, err := ioutil.ReadDir(srcPath)
if err != nil {
return err
}
if len(srcList) == 0 {
// If the source volume is empty copy files from the root into the volume
if err := archive.CopyWithTar(rootVolPath, srcPath); err != nil {
return err
}
var stat syscall.Stat_t
if err := syscall.Stat(rootVolPath, &stat); err != nil {
return err
}
var srcStat syscall.Stat_t
if err := syscall.Stat(srcPath, &srcStat); err != nil {
return err
}
// Change the source volume's ownership if it differs from the root
// files that where just copied
if stat.Uid != srcStat.Uid || stat.Gid != srcStat.Gid {
if err := os.Chown(srcPath, int(stat.Uid), int(stat.Gid)); err != nil {
return err
}
}
}
}
}
}
if err := container.generateLXCConfig(); err != nil {
return err
}
params := []string{
"-n", container.ID,
"-f", container.lxcConfigPath(),
"--",
"/.dockerinit",
}
// Networking
if !container.Config.NetworkDisabled {
params = append(params, "-g", container.network.Gateway.String())
}
// User
if container.Config.User != "" {
params = append(params, "-u", container.Config.User)
}
// Setup environment
env := []string{
"HOME=/",
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"container=lxc",
"HOSTNAME=" + container.Config.Hostname,
}
if container.Config.Tty {
env = append(env, "TERM=xterm")
}
// Init any links between the parent and children
runtime := container.runtime
children, err := runtime.Children(container.Name)
if err != nil {
return err
}
if len(children) > 0 {
container.activeLinks = make(map[string]*Link, len(children))
// If we encounter an error make sure that we rollback any network
// config and ip table changes
rollback := func() {
for _, link := range container.activeLinks {
link.Disable()
}
container.activeLinks = nil
}
for p, child := range children {
link, err := NewLink(container, child, p, runtime.networkManager.bridgeIface)
if err != nil {
rollback()
return err
}
container.activeLinks[link.Alias()] = link
if err := link.Enable(); err != nil {
rollback()
return err
}
for _, envVar := range link.ToEnv() {
env = append(env, envVar)
}
}
}
for _, elem := range container.Config.Env {
env = append(env, elem)
}
if err := container.generateEnvConfig(env); err != nil {
return err
}
if container.Config.WorkingDir != "" {
workingDir := path.Clean(container.Config.WorkingDir)
utils.Debugf("[working dir] working dir is %s", workingDir)
if err := os.MkdirAll(path.Join(container.RootfsPath(), workingDir), 0755); err != nil {
return nil
}
params = append(params,
"-w", workingDir,
)
}
// Program
params = append(params, "--", container.Path)
params = append(params, container.Args...)
var lxcStart string = "lxc-start"
if container.hostConfig.Privileged && container.runtime.capabilities.AppArmor {
lxcStart = path.Join(container.runtime.config.Root, "lxc-start-unconfined")
}
container.cmd = exec.Command(lxcStart, params...)
// Setup logging of stdout and stderr to disk
if err := container.runtime.LogToDisk(container.stdout, container.logPath("json"), "stdout"); err != nil {
return err
}
if err := container.runtime.LogToDisk(container.stderr, container.logPath("json"), "stderr"); err != nil {
return err