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moby--moby/daemon/start.go

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package daemon
import (
"fmt"
"os"
"strings"
"github.com/docker/docker/engine"
"github.com/docker/docker/runconfig"
)
func (daemon *Daemon) ContainerStart(job *engine.Job) engine.Status {
if len(job.Args) < 1 {
return job.Errorf("Usage: %s container_id", job.Name)
}
var (
name = job.Args[0]
)
container, err := daemon.Get(name)
if err != nil {
return job.Error(err)
}
if container.IsPaused() {
return job.Errorf("Cannot start a paused container, try unpause instead.")
}
if container.IsRunning() {
return job.Errorf("Container already started")
}
// If no environment was set, then no hostconfig was passed.
// This is kept for backward compatibility - hostconfig should be passed when
// creating a container, not during start.
if len(job.Environ()) > 0 {
hostConfig := runconfig.ContainerHostConfigFromJob(job)
if err := daemon.setHostConfig(container, hostConfig); err != nil {
return job.Error(err)
}
}
if err := container.Start(); err != nil {
container.LogEvent("die")
return job.Errorf("Cannot start container %s: %s", name, err)
}
return engine.StatusOK
}
func (daemon *Daemon) setHostConfig(container *Container, hostConfig *runconfig.HostConfig) error {
container.Lock()
defer container.Unlock()
if err := parseSecurityOpt(container, hostConfig); err != nil {
return err
}
// FIXME: this should be handled by the volume subsystem
// Validate the HostConfig binds. Make sure that:
// the source exists
for _, bind := range hostConfig.Binds {
splitBind := strings.Split(bind, ":")
source := splitBind[0]
// ensure the source exists on the host
_, err := os.Stat(source)
if err != nil && os.IsNotExist(err) {
err = os.MkdirAll(source, 0755)
if err != nil {
return fmt.Errorf("Could not create local directory '%s' for bind mount: %s!", source, err.Error())
}
}
}
// 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
}