func InitPreStart(dockerSocket string, id containers.Identifier, imageName string) error {
var (
err error
imgInfo *dc.Image
d *docker.DockerClient
)
_, socketActivationType, err := containers.GetSocketActivation(id)
if err != nil {
fmt.Printf("init_pre_start: Error while parsing unit file: %v\n", err)
return err
}
if _, err = user.Lookup(id.LoginFor()); err != nil {
if _, ok := err.(user.UnknownUserError); !ok {
return err
}
if err = createUser(id); err != nil {
return err
}
}
if d, err = docker.GetConnection(dockerSocket); err != nil {
return err
}
if imgInfo, err = d.GetImage(imageName); err != nil {
return err
}
if err := os.MkdirAll(id.HomePath(), 0700); err != nil {
return err
}
u, _ := user.Lookup(id.LoginFor())
volumes := make([]string, 0, 10)
for volPath := range imgInfo.Config.Volumes {
volumes = append(volumes, volPath)
}
user := imgInfo.Config.User
if user == "" {
user = "******"
}
ports, err := containers.GetExistingPorts(id)
if err != nil {
fmt.Printf("container init pre-start: Unable to retrieve port mapping\n")
return err
}
containerData := containers.ContainerInitScript{
imgInfo.Config.User == "",
user,
u.Uid,
u.Gid,
strings.Join(imgInfo.Config.Cmd, " "),
len(volumes) > 0,
strings.Join(volumes, " "),
ports,
socketActivationType == "proxied",
}
file, _, err := utils.OpenFileExclusive(path.Join(id.RunPathFor(), "container-init.sh"), 0700)
if err != nil {
fmt.Printf("container init pre-start: Unable to open script file: %v\n", err)
return err
}
defer file.Close()
if erre := containers.ContainerInitTemplate.Execute(file, containerData); erre != nil {
fmt.Printf("container init pre-start: Unable to output template: ", erre)
return erre
}
if err := file.Close(); err != nil {
return err
}
file, _, err = utils.OpenFileExclusive(path.Join(id.RunPathFor(), "container-cmd.sh"), 0705)
if err != nil {
fmt.Printf("container init pre-start: Unable to open cmd script file: %v\n", err)
return err
}
defer file.Close()
if erre := containers.ContainerCmdTemplate.Execute(file, containerData); erre != nil {
fmt.Printf("container init pre-start: Unable to output cmd template: ", erre)
return erre
}
if err := file.Close(); err != nil {
return err
}
return nil
}
func (req *InstallContainerRequest) Execute(resp jobs.Response) {
id := req.Id
unitName := id.UnitNameFor()
unitPath := id.UnitPathFor()
unitVersionPath := id.VersionedUnitPathFor(req.RequestIdentifier.String())
socketUnitName := id.SocketUnitNameFor()
socketUnitPath := id.SocketUnitPathFor()
var socketActivationType string
if req.SocketActivation {
socketActivationType = "enabled"
if !req.SkipSocketProxy {
socketActivationType = "proxied"
}
}
// attempt to download the environment if it is remote
env := req.Environment
if env != nil {
if err := env.Fetch(100 * 1024); err != nil {
resp.Failure(ErrContainerCreateFailed)
return
}
if env.Empty() {
env = nil
}
}
// open and lock the base path (to prevent simultaneous updates)
state, exists, err := utils.OpenFileExclusive(unitPath, 0664)
if err != nil {
log.Print("install_container: Unable to lock unit file: ", err)
resp.Failure(ErrContainerCreateFailed)
}
defer state.Close()
// write a new file to disk that describes the new service
unit, err := utils.CreateFileExclusive(unitVersionPath, 0664)
if err != nil {
log.Print("install_container: Unable to open unit file definition: ", err)
resp.Failure(ErrContainerCreateFailed)
return
}
defer unit.Close()
// if this is an existing container, read the currently reserved ports
existingPorts := port.PortPairs{}
if exists {
existingPorts, err = containers.GetExistingPorts(id)
if err != nil {
if _, ok := err.(*os.PathError); !ok {
log.Print("install_container: Unable to read existing ports from file: ", err)
resp.Failure(ErrContainerCreateFailed)
return
}
}
}
// allocate and reserve ports for this container
reserved, erra := port.AtomicReserveExternalPorts(unitVersionPath, req.Ports, existingPorts)
if erra != nil {
log.Printf("install_container: Unable to reserve external ports: %+v", erra)
resp.Failure(ErrContainerCreateFailedPortsReserved)
return
}
if len(reserved) > 0 {
resp.WritePendingSuccess(PendingPortMappingName, reserved)
}
var portSpec string
if req.Simple && len(reserved) == 0 {
portSpec = "-P"
} else {
portSpec = dockerPortSpec(reserved)
}
// write the environment to disk
var environmentPath string
if env != nil {
if errw := env.Write(false); errw != nil {
resp.Failure(ErrContainerCreateFailed)
return
}
environmentPath = env.Id.EnvironmentPathFor()
}
// write the network links (if any) to disk
if req.NetworkLinks != nil {
if errw := req.NetworkLinks.Write(id.NetworkLinksPathFor(), false); errw != nil {
resp.Failure(ErrContainerCreateFailed)
return
}
}
slice := "container-small"
// write the definition unit file
args := csystemd.ContainerUnit{
Id: id,
Image: req.Image,
PortSpec: portSpec,
Slice: slice + ".slice",
Isolate: req.Isolate,
ReqId: req.RequestIdentifier.String(),
HomeDir: id.HomePath(),
RunDir: id.RunPathFor(),
EnvironmentPath: environmentPath,
ExecutablePath: filepath.Join("/", "usr", "bin", "gear"),
IncludePath: "",
PortPairs: reserved,
SocketUnitName: socketUnitName,
SocketActivationType: socketActivationType,
DockerFeatures: config.SystemDockerFeatures,
}
var templateName string
switch {
case req.SocketActivation:
templateName = "SOCKETACTIVATED"
case config.SystemDockerFeatures.ForegroundRun:
templateName = "FOREGROUND"
default:
templateName = "SIMPLE"
}
if erre := csystemd.ContainerUnitTemplate.ExecuteTemplate(unit, templateName, args); erre != nil {
log.Printf("install_container: Unable to output template: %+v", erre)
resp.Failure(ErrContainerCreateFailed)
defer os.Remove(unitVersionPath)
return
}
if err := unit.Close(); err != nil {
log.Printf("install_container: Unable to finish writing unit: %+v", err)
resp.Failure(ErrContainerCreateFailed)
defer os.Remove(unitVersionPath)
return
}
// swap the new definition with the old one
if err := utils.AtomicReplaceLink(unitVersionPath, unitPath); err != nil {
log.Printf("install_container: Failed to activate new unit: %+v", err)
resp.Failure(ErrContainerCreateFailed)
return
}
state.Close()
// write whether this container should be started on next boot
if req.Started {
if errs := csystemd.SetUnitStartOnBoot(id, true); errs != nil {
log.Print("install_container: Unable to write container boot link: ", err)
resp.Failure(ErrContainerCreateFailed)
return
}
}
// Generate the socket file and ignore failures
paths := []string{unitPath}
if req.SocketActivation {
if err := writeSocketUnit(socketUnitPath, &args); err == nil {
paths = []string{unitPath, socketUnitPath}
}
}
if err := systemd.EnableAndReloadUnit(systemd.Connection(), unitName, paths...); err != nil {
log.Printf("install_container: Could not enable container %s (%v): %v", unitName, paths, err)
resp.Failure(ErrContainerCreateFailed)
return
}
if req.Started {
if req.SocketActivation {
// Start the socket file, not the service and ignore failures
if err := systemd.Connection().StartUnitJob(socketUnitName, "replace"); err != nil {
log.Printf("install_container: Could not start container socket %s: %v", socketUnitName, err)
resp.Failure(ErrContainerCreateFailed)
return
}
} else {
if err := systemd.Connection().StartUnitJob(unitName, "replace"); err != nil {
log.Printf("install_container: Could not start container %s: %v", unitName, err)
resp.Failure(ErrContainerCreateFailed)
return
}
}
}
w := resp.SuccessWithWrite(jobs.ResponseAccepted, true, false)
if req.Started {
fmt.Fprintf(w, "Container %s is starting\n", id)
} else {
fmt.Fprintf(w, "Container %s is installed\n", id)
}
}