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moby--moby/daemon/daemon.go
John Howard 8fb0ca2c35 Windows: Refactor daemon
Signed-off-by: John Howard <jhoward@microsoft.com>
2015-06-10 12:42:43 -07:00

981 lines
26 KiB
Go

package daemon
import (
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"runtime"
"strings"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api"
"github.com/docker/docker/daemon/events"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/daemon/execdriver/execdrivers"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/graph"
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/broadcastwriter"
"github.com/docker/docker/pkg/fileutils"
"github.com/docker/docker/pkg/graphdb"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/namesgenerator"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/sysinfo"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/pkg/truncindex"
"github.com/docker/docker/registry"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/trust"
"github.com/docker/libnetwork"
)
var (
validContainerNameChars = `[a-zA-Z0-9][a-zA-Z0-9_.-]`
validContainerNamePattern = regexp.MustCompile(`^/?` + validContainerNameChars + `+$`)
// TODO Windows. Change this once daemon is up and running.
ErrSystemNotSupported = errors.New("The Docker daemon is only supported on linux")
)
type contStore struct {
s map[string]*Container
sync.Mutex
}
func (c *contStore) Add(id string, cont *Container) {
c.Lock()
c.s[id] = cont
c.Unlock()
}
func (c *contStore) Get(id string) *Container {
c.Lock()
res := c.s[id]
c.Unlock()
return res
}
func (c *contStore) Delete(id string) {
c.Lock()
delete(c.s, id)
c.Unlock()
}
func (c *contStore) List() []*Container {
containers := new(History)
c.Lock()
for _, cont := range c.s {
containers.Add(cont)
}
c.Unlock()
containers.Sort()
return *containers
}
type Daemon struct {
ID string
repository string
sysInitPath string
containers *contStore
execCommands *execStore
graph *graph.Graph
repositories *graph.TagStore
idIndex *truncindex.TruncIndex
sysInfo *sysinfo.SysInfo
config *Config
containerGraph *graphdb.Database
driver graphdriver.Driver
execDriver execdriver.Driver
statsCollector *statsCollector
defaultLogConfig runconfig.LogConfig
RegistryService *registry.Service
EventsService *events.Events
netController libnetwork.NetworkController
root string
}
// Get looks for a container using the provided information, which could be
// one of the following inputs from the caller:
// - A full container ID, which will exact match a container in daemon's list
// - A container name, which will only exact match via the GetByName() function
// - A partial container ID prefix (e.g. short ID) of any length that is
// unique enough to only return a single container object
// If none of these searches succeed, an error is returned
func (daemon *Daemon) Get(prefixOrName string) (*Container, error) {
if containerByID := daemon.containers.Get(prefixOrName); containerByID != nil {
// prefix is an exact match to a full container ID
return containerByID, nil
}
// GetByName will match only an exact name provided; we ignore errors
if containerByName, _ := daemon.GetByName(prefixOrName); containerByName != nil {
// prefix is an exact match to a full container Name
return containerByName, nil
}
containerId, indexError := daemon.idIndex.Get(prefixOrName)
if indexError != nil {
return nil, indexError
}
return daemon.containers.Get(containerId), nil
}
// Exists returns a true if a container of the specified ID or name exists,
// false otherwise.
func (daemon *Daemon) Exists(id string) bool {
c, _ := daemon.Get(id)
return c != nil
}
func (daemon *Daemon) containerRoot(id string) string {
return filepath.Join(daemon.repository, id)
}
// Load reads the contents of a container from disk
// This is typically done at startup.
func (daemon *Daemon) load(id string) (*Container, error) {
container := &Container{
CommonContainer: daemon.newBaseContainer(id),
}
if err := container.FromDisk(); err != nil {
return nil, err
}
if container.ID != id {
return container, fmt.Errorf("Container %s is stored at %s", container.ID, id)
}
return container, nil
}
// Register makes a container object usable by the daemon as <container.ID>
// This is a wrapper for register
func (daemon *Daemon) Register(container *Container) error {
return daemon.register(container, true)
}
// register makes a container object usable by the daemon as <container.ID>
func (daemon *Daemon) register(container *Container, updateSuffixarray bool) error {
if container.daemon != nil || daemon.Exists(container.ID) {
return fmt.Errorf("Container is already loaded")
}
if err := validateID(container.ID); err != nil {
return err
}
if err := daemon.ensureName(container); err != nil {
return err
}
container.daemon = daemon
// Attach to stdout and stderr
container.stderr = broadcastwriter.New()
container.stdout = broadcastwriter.New()
// Attach to stdin
if container.Config.OpenStdin {
container.stdin, container.stdinPipe = io.Pipe()
} else {
container.stdinPipe = ioutils.NopWriteCloser(ioutil.Discard) // Silently drop stdin
}
// done
daemon.containers.Add(container.ID, container)
// don't update the Suffixarray if we're starting up
// we'll waste time if we update it for every container
daemon.idIndex.Add(container.ID)
if err := daemon.verifyVolumesInfo(container); err != nil {
return err
}
if err := container.prepareMountPoints(); err != nil {
return err
}
if container.IsRunning() {
logrus.Debugf("killing old running container %s", container.ID)
container.SetStopped(&execdriver.ExitStatus{ExitCode: 0})
// use the current driver and ensure that the container is dead x.x
cmd := &execdriver.Command{
ID: container.ID,
}
daemon.execDriver.Terminate(cmd)
if err := container.Unmount(); err != nil {
logrus.Debugf("unmount error %s", err)
}
if err := container.ToDisk(); err != nil {
logrus.Debugf("saving stopped state to disk %s", err)
}
}
return nil
}
func (daemon *Daemon) ensureName(container *Container) error {
if container.Name == "" {
name, err := daemon.generateNewName(container.ID)
if err != nil {
return err
}
container.Name = name
if err := container.ToDisk(); err != nil {
logrus.Debugf("Error saving container name %s", err)
}
}
return nil
}
func (daemon *Daemon) restore() error {
type cr struct {
container *Container
registered bool
}
var (
debug = (os.Getenv("DEBUG") != "" || os.Getenv("TEST") != "")
currentDriver = daemon.driver.String()
containers = make(map[string]*cr)
)
if !debug {
logrus.Info("Loading containers: start.")
}
dir, err := ioutil.ReadDir(daemon.repository)
if err != nil {
return err
}
for _, v := range dir {
id := v.Name()
container, err := daemon.load(id)
if !debug && logrus.GetLevel() == logrus.InfoLevel {
fmt.Print(".")
}
if err != nil {
logrus.Errorf("Failed to load container %v: %v", id, err)
continue
}
// Ignore the container if it does not support the current driver being used by the graph
if (container.Driver == "" && currentDriver == "aufs") || container.Driver == currentDriver {
logrus.Debugf("Loaded container %v", container.ID)
containers[container.ID] = &cr{container: container}
} else {
logrus.Debugf("Cannot load container %s because it was created with another graph driver.", container.ID)
}
}
if entities := daemon.containerGraph.List("/", -1); entities != nil {
for _, p := range entities.Paths() {
if !debug && logrus.GetLevel() == logrus.InfoLevel {
fmt.Print(".")
}
e := entities[p]
if c, ok := containers[e.ID()]; ok {
c.registered = true
}
}
}
group := sync.WaitGroup{}
for _, c := range containers {
group.Add(1)
go func(container *Container, registered bool) {
defer group.Done()
if !registered {
// Try to set the default name for a container if it exists prior to links
container.Name, err = daemon.generateNewName(container.ID)
if err != nil {
logrus.Debugf("Setting default id - %s", err)
}
}
if err := daemon.register(container, false); err != nil {
logrus.Debugf("Failed to register container %s: %s", container.ID, err)
}
// check the restart policy on the containers and restart any container with
// the restart policy of "always"
if daemon.config.AutoRestart && container.shouldRestart() {
logrus.Debugf("Starting container %s", container.ID)
if err := container.Start(); err != nil {
logrus.Debugf("Failed to start container %s: %s", container.ID, err)
}
}
}(c.container, c.registered)
}
group.Wait()
if !debug {
if logrus.GetLevel() == logrus.InfoLevel {
fmt.Println()
}
logrus.Info("Loading containers: done.")
}
return nil
}
func (daemon *Daemon) mergeAndVerifyConfig(config *runconfig.Config, img *image.Image) error {
if img != nil && img.Config != nil {
if err := runconfig.Merge(config, img.Config); err != nil {
return err
}
}
if config.Entrypoint.Len() == 0 && config.Cmd.Len() == 0 {
return fmt.Errorf("No command specified")
}
return nil
}
func (daemon *Daemon) generateIdAndName(name string) (string, string, error) {
var (
err error
id = stringid.GenerateRandomID()
)
if name == "" {
if name, err = daemon.generateNewName(id); err != nil {
return "", "", err
}
return id, name, nil
}
if name, err = daemon.reserveName(id, name); err != nil {
return "", "", err
}
return id, name, nil
}
func (daemon *Daemon) reserveName(id, name string) (string, error) {
if !validContainerNamePattern.MatchString(name) {
return "", fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
}
if name[0] != '/' {
name = "/" + name
}
if _, err := daemon.containerGraph.Set(name, id); err != nil {
if !graphdb.IsNonUniqueNameError(err) {
return "", err
}
conflictingContainer, err := daemon.GetByName(name)
if err != nil {
if strings.Contains(err.Error(), "Could not find entity") {
return "", err
}
// Remove name and continue starting the container
if err := daemon.containerGraph.Delete(name); err != nil {
return "", err
}
} else {
nameAsKnownByUser := strings.TrimPrefix(name, "/")
return "", fmt.Errorf(
"Conflict. The name %q is already in use by container %s. You have to delete (or rename) that container to be able to reuse that name.", nameAsKnownByUser,
stringid.TruncateID(conflictingContainer.ID))
}
}
return name, nil
}
func (daemon *Daemon) generateNewName(id string) (string, error) {
var name string
for i := 0; i < 6; i++ {
name = namesgenerator.GetRandomName(i)
if name[0] != '/' {
name = "/" + name
}
if _, err := daemon.containerGraph.Set(name, id); err != nil {
if !graphdb.IsNonUniqueNameError(err) {
return "", err
}
continue
}
return name, nil
}
name = "/" + stringid.TruncateID(id)
if _, err := daemon.containerGraph.Set(name, id); err != nil {
return "", err
}
return name, nil
}
func (daemon *Daemon) generateHostname(id string, config *runconfig.Config) {
// Generate default hostname
// FIXME: the lxc template no longer needs to set a default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
}
func (daemon *Daemon) getEntrypointAndArgs(configEntrypoint *runconfig.Entrypoint, configCmd *runconfig.Command) (string, []string) {
var (
entrypoint string
args []string
)
cmdSlice := configCmd.Slice()
if configEntrypoint.Len() != 0 {
eSlice := configEntrypoint.Slice()
entrypoint = eSlice[0]
args = append(eSlice[1:], cmdSlice...)
} else {
entrypoint = cmdSlice[0]
args = cmdSlice[1:]
}
return entrypoint, args
}
func (daemon *Daemon) newContainer(name string, config *runconfig.Config, imgID string) (*Container, error) {
var (
id string
err error
)
id, name, err = daemon.generateIdAndName(name)
if err != nil {
return nil, err
}
daemon.generateHostname(id, config)
entrypoint, args := daemon.getEntrypointAndArgs(config.Entrypoint, config.Cmd)
base := daemon.newBaseContainer(id)
base.Created = time.Now().UTC()
base.Path = entrypoint
base.Args = args //FIXME: de-duplicate from config
base.Config = config
base.hostConfig = &runconfig.HostConfig{}
base.ImageID = imgID
base.NetworkSettings = &network.Settings{}
base.Name = name
base.Driver = daemon.driver.String()
base.ExecDriver = daemon.execDriver.Name()
container := &Container{
CommonContainer: base,
}
return container, err
}
func GetFullContainerName(name string) (string, error) {
if name == "" {
return "", fmt.Errorf("Container name cannot be empty")
}
if name[0] != '/' {
name = "/" + name
}
return name, nil
}
func (daemon *Daemon) GetByName(name string) (*Container, error) {
fullName, err := GetFullContainerName(name)
if err != nil {
return nil, err
}
entity := daemon.containerGraph.Get(fullName)
if entity == nil {
return nil, fmt.Errorf("Could not find entity for %s", name)
}
e := daemon.containers.Get(entity.ID())
if e == nil {
return nil, fmt.Errorf("Could not find container for entity id %s", entity.ID())
}
return e, nil
}
func (daemon *Daemon) Children(name string) (map[string]*Container, error) {
name, err := GetFullContainerName(name)
if err != nil {
return nil, err
}
children := make(map[string]*Container)
err = daemon.containerGraph.Walk(name, func(p string, e *graphdb.Entity) error {
c, err := daemon.Get(e.ID())
if err != nil {
return err
}
children[p] = c
return nil
}, 0)
if err != nil {
return nil, err
}
return children, nil
}
func (daemon *Daemon) Parents(name string) ([]string, error) {
name, err := GetFullContainerName(name)
if err != nil {
return nil, err
}
return daemon.containerGraph.Parents(name)
}
func (daemon *Daemon) RegisterLink(parent, child *Container, alias string) error {
fullName := filepath.Join(parent.Name, alias)
if !daemon.containerGraph.Exists(fullName) {
_, err := daemon.containerGraph.Set(fullName, child.ID)
return err
}
return nil
}
func (daemon *Daemon) RegisterLinks(container *Container, hostConfig *runconfig.HostConfig) error {
if hostConfig != nil && hostConfig.Links != nil {
for _, l := range hostConfig.Links {
name, alias, err := parsers.ParseLink(l)
if err != nil {
return err
}
child, err := daemon.Get(name)
if err != nil {
//An error from daemon.Get() means this name could not be found
return fmt.Errorf("Could not get container for %s", name)
}
for child.hostConfig.NetworkMode.IsContainer() {
parts := strings.SplitN(string(child.hostConfig.NetworkMode), ":", 2)
child, err = daemon.Get(parts[1])
if err != nil {
return fmt.Errorf("Could not get container for %s", parts[1])
}
}
if child.hostConfig.NetworkMode.IsHost() {
return runconfig.ErrConflictHostNetworkAndLinks
}
if err := daemon.RegisterLink(container, child, alias); err != nil {
return err
}
}
// After we load all the links into the daemon
// set them to nil on the hostconfig
hostConfig.Links = nil
if err := container.WriteHostConfig(); err != nil {
return err
}
}
return nil
}
func NewDaemon(config *Config, registryService *registry.Service) (daemon *Daemon, err error) {
// Ensure we have compatible configuration options
if err := checkConfigOptions(config); err != nil {
return nil, err
}
// Do we have a disabled network?
config.DisableNetwork = isNetworkDisabled(config)
// Check that the system is supported and we have sufficient privileges
if err := checkSystem(); err != nil {
return nil, err
}
// set up SIGUSR1 handler to dump Go routine stacks
setupSigusr1Trap()
// set up the tmpDir to use a canonical path
tmp, err := tempDir(config.Root)
if err != nil {
return nil, fmt.Errorf("Unable to get the TempDir under %s: %s", config.Root, err)
}
realTmp, err := fileutils.ReadSymlinkedDirectory(tmp)
if err != nil {
return nil, fmt.Errorf("Unable to get the full path to the TempDir (%s): %s", tmp, err)
}
os.Setenv("TMPDIR", realTmp)
// get the canonical path to the Docker root directory
var realRoot string
if _, err := os.Stat(config.Root); err != nil && os.IsNotExist(err) {
realRoot = config.Root
} else {
realRoot, err = fileutils.ReadSymlinkedDirectory(config.Root)
if err != nil {
return nil, fmt.Errorf("Unable to get the full path to root (%s): %s", config.Root, err)
}
}
config.Root = realRoot
// Create the root directory if it doesn't exists
if err := system.MkdirAll(config.Root, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
// Set the default driver
graphdriver.DefaultDriver = config.GraphDriver
// Load storage driver
driver, err := graphdriver.New(config.Root, config.GraphOptions)
if err != nil {
return nil, fmt.Errorf("error initializing graphdriver: %v", err)
}
logrus.Debugf("Using graph driver %s", driver)
d := &Daemon{}
d.driver = driver
// Ensure the graph driver is shutdown at a later point
defer func() {
if err != nil {
if err := d.Shutdown(); err != nil {
logrus.Error(err)
}
}
}()
// Verify logging driver type
if config.LogConfig.Type != "none" {
if _, err := logger.GetLogDriver(config.LogConfig.Type); err != nil {
return nil, fmt.Errorf("error finding the logging driver: %v", err)
}
}
logrus.Debugf("Using default logging driver %s", config.LogConfig.Type)
// Configure and validate the kernels security support
if err := configureKernelSecuritySupport(config, d.driver.String()); err != nil {
return nil, err
}
daemonRepo := filepath.Join(config.Root, "containers")
if err := system.MkdirAll(daemonRepo, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
// Migrate the container if it is aufs and aufs is enabled
if err := migrateIfDownlevel(d.driver, config.Root); err != nil {
return nil, err
}
logrus.Debug("Creating images graph")
g, err := graph.NewGraph(filepath.Join(config.Root, "graph"), d.driver)
if err != nil {
return nil, err
}
// Configure the volumes driver
if err := configureVolumes(config); err != nil {
return nil, err
}
trustKey, err := api.LoadOrCreateTrustKey(config.TrustKeyPath)
if err != nil {
return nil, err
}
trustDir := filepath.Join(config.Root, "trust")
if err := system.MkdirAll(trustDir, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
trustService, err := trust.NewTrustStore(trustDir)
if err != nil {
return nil, fmt.Errorf("could not create trust store: %s", err)
}
eventsService := events.New()
logrus.Debug("Creating repository list")
tagCfg := &graph.TagStoreConfig{
Graph: g,
Key: trustKey,
Registry: registryService,
Events: eventsService,
Trust: trustService,
}
repositories, err := graph.NewTagStore(filepath.Join(config.Root, "repositories-"+d.driver.String()), tagCfg)
if err != nil {
return nil, fmt.Errorf("Couldn't create Tag store: %s", err)
}
if !config.DisableNetwork {
d.netController, err = initNetworkController(config)
if err != nil {
return nil, fmt.Errorf("Error initializing network controller: %v", err)
}
}
graphdbPath := filepath.Join(config.Root, "linkgraph.db")
graph, err := graphdb.NewSqliteConn(graphdbPath)
if err != nil {
return nil, err
}
d.containerGraph = graph
sysInitPath, err := configureSysInit(config)
if err != nil {
return nil, err
}
sysInfo := sysinfo.New(false)
ed, err := execdrivers.NewDriver(config.ExecDriver, config.ExecOptions, config.ExecRoot, config.Root, sysInitPath, sysInfo)
if err != nil {
return nil, err
}
d.ID = trustKey.PublicKey().KeyID()
d.repository = daemonRepo
d.containers = &contStore{s: make(map[string]*Container)}
d.execCommands = newExecStore()
d.graph = g
d.repositories = repositories
d.idIndex = truncindex.NewTruncIndex([]string{})
d.sysInfo = sysInfo
d.config = config
d.sysInitPath = sysInitPath
d.execDriver = ed
d.statsCollector = newStatsCollector(1 * time.Second)
d.defaultLogConfig = config.LogConfig
d.RegistryService = registryService
d.EventsService = eventsService
d.root = config.Root
if err := d.restore(); err != nil {
return nil, err
}
return d, nil
}
func (daemon *Daemon) Shutdown() error {
if daemon.containerGraph != nil {
if err := daemon.containerGraph.Close(); err != nil {
logrus.Errorf("Error during container graph.Close(): %v", err)
}
}
if daemon.driver != nil {
if err := daemon.driver.Cleanup(); err != nil {
logrus.Errorf("Error during graph storage driver.Cleanup(): %v", err)
}
}
if daemon.containers != nil {
group := sync.WaitGroup{}
logrus.Debug("starting clean shutdown of all containers...")
for _, container := range daemon.List() {
c := container
if c.IsRunning() {
logrus.Debugf("stopping %s", c.ID)
group.Add(1)
go func() {
defer group.Done()
// If container failed to exit in 10 seconds of SIGTERM, then using the force
if err := c.Stop(10); err != nil {
logrus.Errorf("Stop container %s with error: %v", c.ID, err)
}
c.WaitStop(-1 * time.Second)
logrus.Debugf("container stopped %s", c.ID)
}()
}
}
group.Wait()
// trigger libnetwork GC only if it's initialized
if daemon.netController != nil {
daemon.netController.GC()
}
}
return nil
}
func (daemon *Daemon) Mount(container *Container) error {
dir, err := daemon.driver.Get(container.ID, container.GetMountLabel())
if err != nil {
return fmt.Errorf("Error getting container %s from driver %s: %s", container.ID, daemon.driver, err)
}
if container.basefs != dir {
// The mount path reported by the graph driver should always be trusted on Windows, since the
// volume path for a given mounted layer may change over time. This should only be an error
// on non-Windows operating systems.
if container.basefs != "" && runtime.GOOS != "windows" {
daemon.driver.Put(container.ID)
return fmt.Errorf("Error: driver %s is returning inconsistent paths for container %s ('%s' then '%s')",
daemon.driver, container.ID, container.basefs, dir)
}
}
container.basefs = dir
return nil
}
func (daemon *Daemon) Unmount(container *Container) error {
daemon.driver.Put(container.ID)
return nil
}
func (daemon *Daemon) Run(c *Container, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (execdriver.ExitStatus, error) {
return daemon.execDriver.Run(c.command, pipes, startCallback)
}
func (daemon *Daemon) Kill(c *Container, sig int) error {
return daemon.execDriver.Kill(c.command, sig)
}
func (daemon *Daemon) Stats(c *Container) (*execdriver.ResourceStats, error) {
return daemon.execDriver.Stats(c.ID)
}
func (daemon *Daemon) SubscribeToContainerStats(name string) (chan interface{}, error) {
c, err := daemon.Get(name)
if err != nil {
return nil, err
}
ch := daemon.statsCollector.collect(c)
return ch, nil
}
func (daemon *Daemon) UnsubscribeToContainerStats(name string, ch chan interface{}) error {
c, err := daemon.Get(name)
if err != nil {
return err
}
daemon.statsCollector.unsubscribe(c, ch)
return nil
}
// FIXME: this is a convenience function for integration tests
// which need direct access to daemon.graph.
// Once the tests switch to using engine and jobs, this method
// can go away.
func (daemon *Daemon) Graph() *graph.Graph {
return daemon.graph
}
func (daemon *Daemon) Repositories() *graph.TagStore {
return daemon.repositories
}
func (daemon *Daemon) Config() *Config {
return daemon.config
}
func (daemon *Daemon) SystemConfig() *sysinfo.SysInfo {
return daemon.sysInfo
}
func (daemon *Daemon) SystemInitPath() string {
return daemon.sysInitPath
}
func (daemon *Daemon) GraphDriver() graphdriver.Driver {
return daemon.driver
}
func (daemon *Daemon) ExecutionDriver() execdriver.Driver {
return daemon.execDriver
}
func (daemon *Daemon) ContainerGraph() *graphdb.Database {
return daemon.containerGraph
}
func (daemon *Daemon) ImageGetCached(imgID string, config *runconfig.Config) (*image.Image, error) {
// Retrieve all images
images, err := daemon.Graph().Map()
if err != nil {
return nil, err
}
// Store the tree in a map of map (map[parentId][childId])
imageMap := make(map[string]map[string]struct{})
for _, img := range images {
if _, exists := imageMap[img.Parent]; !exists {
imageMap[img.Parent] = make(map[string]struct{})
}
imageMap[img.Parent][img.ID] = struct{}{}
}
// Loop on the children of the given image and check the config
var match *image.Image
for elem := range imageMap[imgID] {
img, ok := images[elem]
if !ok {
return nil, fmt.Errorf("unable to find image %q", elem)
}
if runconfig.Compare(&img.ContainerConfig, config) {
if match == nil || match.Created.Before(img.Created) {
match = img
}
}
}
return match, nil
}
// tempDir returns the default directory to use for temporary files.
func tempDir(rootDir string) (string, error) {
var tmpDir string
if tmpDir = os.Getenv("DOCKER_TMPDIR"); tmpDir == "" {
tmpDir = filepath.Join(rootDir, "tmp")
}
return tmpDir, system.MkdirAll(tmpDir, 0700)
}
func (daemon *Daemon) setHostConfig(container *Container, hostConfig *runconfig.HostConfig) error {
container.Lock()
if err := parseSecurityOpt(container, hostConfig); err != nil {
container.Unlock()
return err
}
container.Unlock()
// Do not lock while creating volumes since this could be calling out to external plugins
// Don't want to block other actions, like `docker ps` because we're waiting on an external plugin
if err := daemon.registerMountPoints(container, hostConfig); err != nil {
return err
}
container.Lock()
defer container.Unlock()
// Register any links from the host config before starting the container
if err := daemon.RegisterLinks(container, hostConfig); err != nil {
return err
}
container.hostConfig = hostConfig
container.toDisk()
return nil
}
func (daemon *Daemon) newBaseContainer(id string) CommonContainer {
return CommonContainer{
ID: id,
State: NewState(),
MountPoints: make(map[string]*mountPoint),
Volumes: make(map[string]string),
VolumesRW: make(map[string]bool),
execCommands: newExecStore(),
root: daemon.containerRoot(id),
}
}