func main() {
libPath := flag.String("lib", "./lib", "Directory containing hooks")
rootFsPath := flag.String("root", "", "Directory that will become root in the new mount namespace")
runPath := flag.String("run", "./run", "Directory where server socket is placed")
userNsFlag := flag.String("userns", "enabled", "If specified, use user namespacing")
title := flag.String("title", "", "")
flag.Parse()
if *rootFsPath == "" {
missing("--root")
}
binPath, err := filepath.Abs(filepath.Dir(os.Args[0]))
if err != nil {
fmt.Fprintf(os.Stderr, "wshd: obtain absolute path: %s", err)
os.Exit(6)
}
socketPath := path.Join(*runPath, "wshd.sock")
privileged := false
if *userNsFlag == "" || *userNsFlag == "disabled" {
privileged = true
}
containerReader, hostWriter, err := os.Pipe()
if err != nil {
fmt.Fprintf(os.Stderr, "wshd: create pipe: %s", err)
os.Exit(5)
}
hostReader, containerWriter, err := os.Pipe()
if err != nil {
fmt.Fprintf(os.Stderr, "wshd: create pipe: %s", err)
os.Exit(4)
}
sync := &containerizer.PipeSynchronizer{
Reader: hostReader,
Writer: hostWriter,
}
listener, err := unix_socket.NewListenerFromPath(socketPath)
if err != nil {
fmt.Fprintf(os.Stderr, "wshd: create listener: %s", err)
os.Exit(8)
}
socketFile, err := listener.File()
if err != nil {
fmt.Fprintf(os.Stderr, "wshd: obtain listener file: %s", err)
os.Exit(9)
}
beforeCloneInitializer := &system.Initializer{Steps: []system.StepRunner{
&containerizer.FuncStep{
(&container_daemon.RlimitsManager{}).Init,
},
}}
maxUID := sysinfo.Min(sysinfo.MustGetMaxValidUID(), sysinfo.MustGetMaxValidGID())
cz := containerizer.Containerizer{
BeforeCloneInitializer: beforeCloneInitializer,
InitBinPath: path.Join(binPath, "initc"),
InitArgs: []string{
"--root", *rootFsPath,
"--config", path.Join(*libPath, "../etc/config"),
"--title", *title,
},
Execer: &system.NamespacingExecer{
CommandRunner: linux_command_runner.New(),
ExtraFiles: []*os.File{containerReader, containerWriter, socketFile},
Privileged: privileged,
MaxUID: maxUID,
},
Signaller: sync,
Waiter: sync,
// Temporary until we merge the hook scripts functionality in Golang
CommandRunner: linux_command_runner.New(),
LibPath: *libPath,
RootfsPath: *rootFsPath,
}
err = cz.Create()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to create container: %s", err)
os.Exit(2)
}
}
"github.com/cloudfoundry-incubator/garden-linux/containerizer"
"github.com/cloudfoundry-incubator/garden-linux/containerizer/fake_container_execer"
"github.com/cloudfoundry-incubator/garden-linux/containerizer/fake_initializer"
"github.com/cloudfoundry-incubator/garden-linux/containerizer/fake_signaller"
"github.com/cloudfoundry-incubator/garden-linux/containerizer/fake_waiter"
"github.com/cloudfoundry-incubator/garden-linux/hook"
. "github.com/cloudfoundry/gunk/command_runner/fake_command_runner"
. "github.com/cloudfoundry/gunk/command_runner/fake_command_runner/matchers"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Containerizer", func() {
Describe("Create", func() {
var cz *containerizer.Containerizer
var containerExecer *fake_container_execer.FakeContainerExecer
var signaller *fake_signaller.FakeSignaller
var waiter *fake_waiter.FakeWaiter
var hookCommandRunner *FakeCommandRunner
var beforeCloneInitializer *fake_initializer.FakeInitializer
BeforeEach(func() {
containerExecer = &fake_container_execer.FakeContainerExecer{}
signaller = &fake_signaller.FakeSignaller{}
waiter = &fake_waiter.FakeWaiter{}
hookCommandRunner = &FakeCommandRunner{}
beforeCloneInitializer = &fake_initializer.FakeInitializer{}
cz = &containerizer.Containerizer{
BeforeCloneInitializer: beforeCloneInitializer,
// initc initializes a newly created container and then execs to become
// the init process
func main() {
if reexec.Init() {
return
}
defer func() {
if r := recover(); r != nil {
fmt.Fprintf(os.Stderr, "initc: panicked: %s\n", r)
os.Exit(4)
}
}()
rootFsPath := flag.String("root", "", "Path for the root file system directory")
configFilePath := flag.String("config", "./etc/config", "Path for the configuration file")
title := flag.String("title", "", "")
cf_lager.AddFlags(flag.CommandLine)
flag.Parse()
if *rootFsPath == "" {
missing("--root")
}
syncReader := os.NewFile(uintptr(3), "/dev/a")
defer syncReader.Close()
syncWriter := os.NewFile(uintptr(4), "/dev/d")
defer syncWriter.Close()
sync := &containerizer.PipeSynchronizer{
Reader: syncReader,
Writer: syncWriter,
}
if err := sync.Wait(2 * time.Minute); err != nil {
fail(fmt.Sprintf("initc: wait for host: %s", err), 8)
}
env, err := process.EnvFromFile(*configFilePath)
if err != nil {
fmt.Fprintf(os.Stderr, "initc: failed to get env from config file: %s\n", err)
os.Exit(3)
}
dropCapabilities := env["root_uid"] != "0"
procMountFlags := syscall.MS_NOSUID | syscall.MS_NODEV | syscall.MS_NOEXEC
sysMountFlags := syscall.MS_NOSUID | syscall.MS_NODEV | syscall.MS_NOEXEC | syscall.MS_RDONLY
if dropCapabilities {
procMountFlags = procMountFlags | syscall.MS_RDONLY
}
initializer := &system.Initializer{
Steps: []system.StepRunner{
&containerizer.FuncStep{system.Mount{
Type: system.Tmpfs,
Flags: syscall.MS_NODEV,
TargetPath: "/dev/shm",
}.Mount},
&containerizer.FuncStep{system.Mount{
Type: system.Proc,
Flags: procMountFlags,
TargetPath: "/proc",
}.Mount},
&containerizer.FuncStep{system.Mount{
Type: system.Sys,
Flags: sysMountFlags,
TargetPath: "/sys",
}.Mount},
&containerizer.FuncStep{system.Mount{
Type: system.Devpts,
TargetPath: "/dev/pts",
Data: "newinstance,ptmxmode=0666",
}.Mount},
&containerizer.FuncStep{system.Unmount{
Dir: "/tmp/garden-host",
}.Unmount},
&containerizer.FuncStep{func() error {
return setupNetwork(env)
}},
&containerizer.CapabilitiesStep{
Drop: dropCapabilities,
Capabilities: &sys.ProcessCapabilities{Pid: os.Getpid()},
},
},
}
containerizer := containerizer.Containerizer{
RootfsPath: *rootFsPath,
ContainerInitializer: initializer,
Waiter: sync,
Signaller: sync,
}
if err := containerizer.Init(); err != nil {
fail(fmt.Sprintf("failed to init containerizer: %s", err), 2)
}
syscall.RawSyscall(syscall.SYS_FCNTL, uintptr(4), syscall.F_SETFD, 0)
syscall.RawSyscall(syscall.SYS_FCNTL, uintptr(5), syscall.F_SETFD, 0)
if err := syscall.Exec("/proc/self/exe", []string{"initd", fmt.Sprintf("-dropCapabilities=%t", dropCapabilities), fmt.Sprintf("-title=\"%s\"", *title)}, os.Environ()); err != nil {
fail(fmt.Sprintf("failed to reexec: %s", err), 3)
}
}