move dependencies to vendor

vendor/github.com/opencontainers/runc/libcontainer/init_linux.go

@@ -0,0 +1,330 @@
+// +build linux
+
+package libcontainer
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+	"syscall"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+	"github.com/opencontainers/runc/libcontainer/netlink"
+	"github.com/opencontainers/runc/libcontainer/seccomp"
+	"github.com/opencontainers/runc/libcontainer/system"
+	"github.com/opencontainers/runc/libcontainer/user"
+	"github.com/opencontainers/runc/libcontainer/utils"
+)
+
+type initType string
+
+const (
+	initSetns    initType = "setns"
+	initStandard initType = "standard"
+)
+
+type pid struct {
+	Pid int `json:"pid"`
+}
+
+// network is an internal struct used to setup container networks.
+type network struct {
+	configs.Network
+
+	// TempVethPeerName is a unique temporary veth peer name that was placed into
+	// the container's namespace.
+	TempVethPeerName string `json:"temp_veth_peer_name"`
+}
+
+// initConfig is used for transferring parameters from Exec() to Init()
+type initConfig struct {
+	Args             []string        `json:"args"`
+	Env              []string        `json:"env"`
+	Cwd              string          `json:"cwd"`
+	Capabilities     []string        `json:"capabilities"`
+	User             string          `json:"user"`
+	Config           *configs.Config `json:"config"`
+	Console          string          `json:"console"`
+	Networks         []*network      `json:"network"`
+	PassedFilesCount int             `json:"passed_files_count"`
+}
+
+type initer interface {
+	Init() error
+}
+
+func newContainerInit(t initType, pipe *os.File) (initer, error) {
+	var config *initConfig
+	if err := json.NewDecoder(pipe).Decode(&config); err != nil {
+		return nil, err
+	}
+	if err := populateProcessEnvironment(config.Env); err != nil {
+		return nil, err
+	}
+	switch t {
+	case initSetns:
+		return &linuxSetnsInit{
+			config: config,
+		}, nil
+	case initStandard:
+		return &linuxStandardInit{
+			parentPid: syscall.Getppid(),
+			config:    config,
+		}, nil
+	}
+	return nil, fmt.Errorf("unknown init type %q", t)
+}
+
+// populateProcessEnvironment loads the provided environment variables into the
+// current processes's environment.
+func populateProcessEnvironment(env []string) error {
+	for _, pair := range env {
+		p := strings.SplitN(pair, "=", 2)
+		if len(p) < 2 {
+			return fmt.Errorf("invalid environment '%v'", pair)
+		}
+		if err := os.Setenv(p[0], p[1]); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// finalizeNamespace drops the caps, sets the correct user
+// and working dir, and closes any leaked file descriptors
+// before executing the command inside the namespace
+func finalizeNamespace(config *initConfig) error {
+	// Ensure that all unwanted fds we may have accidentally
+	// inherited are marked close-on-exec so they stay out of the
+	// container
+	if err := utils.CloseExecFrom(config.PassedFilesCount + 3); err != nil {
+		return err
+	}
+
+	capabilities := config.Config.Capabilities
+	if config.Capabilities != nil {
+		capabilities = config.Capabilities
+	}
+	w, err := newCapWhitelist(capabilities)
+	if err != nil {
+		return err
+	}
+	// drop capabilities in bounding set before changing user
+	if err := w.dropBoundingSet(); err != nil {
+		return err
+	}
+	// preserve existing capabilities while we change users
+	if err := system.SetKeepCaps(); err != nil {
+		return err
+	}
+	if err := setupUser(config); err != nil {
+		return err
+	}
+	if err := system.ClearKeepCaps(); err != nil {
+		return err
+	}
+	// drop all other capabilities
+	if err := w.drop(); err != nil {
+		return err
+	}
+	if config.Cwd != "" {
+		if err := syscall.Chdir(config.Cwd); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// joinExistingNamespaces gets all the namespace paths specified for the container and
+// does a setns on the namespace fd so that the current process joins the namespace.
+func joinExistingNamespaces(namespaces []configs.Namespace) error {
+	for _, ns := range namespaces {
+		if ns.Path != "" {
+			f, err := os.OpenFile(ns.Path, os.O_RDONLY, 0)
+			if err != nil {
+				return err
+			}
+			err = system.Setns(f.Fd(), uintptr(ns.Syscall()))
+			f.Close()
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// setupUser changes the groups, gid, and uid for the user inside the container
+func setupUser(config *initConfig) error {
+	// Set up defaults.
+	defaultExecUser := user.ExecUser{
+		Uid:  syscall.Getuid(),
+		Gid:  syscall.Getgid(),
+		Home: "/",
+	}
+	passwdPath, err := user.GetPasswdPath()
+	if err != nil {
+		return err
+	}
+	groupPath, err := user.GetGroupPath()
+	if err != nil {
+		return err
+	}
+	execUser, err := user.GetExecUserPath(config.User, &defaultExecUser, passwdPath, groupPath)
+	if err != nil {
+		return err
+	}
+
+	var addGroups []int
+	if len(config.Config.AdditionalGroups) > 0 {
+		addGroups, err = user.GetAdditionalGroupsPath(config.Config.AdditionalGroups, groupPath)
+		if err != nil {
+			return err
+		}
+	}
+
+	suppGroups := append(execUser.Sgids, addGroups...)
+	if err := syscall.Setgroups(suppGroups); err != nil {
+		return err
+	}
+
+	if err := system.Setgid(execUser.Gid); err != nil {
+		return err
+	}
+	if err := system.Setuid(execUser.Uid); err != nil {
+		return err
+	}
+	// if we didn't get HOME already, set it based on the user's HOME
+	if envHome := os.Getenv("HOME"); envHome == "" {
+		if err := os.Setenv("HOME", execUser.Home); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// setupNetwork sets up and initializes any network interface inside the container.
+func setupNetwork(config *initConfig) error {
+	for _, config := range config.Networks {
+		strategy, err := getStrategy(config.Type)
+		if err != nil {
+			return err
+		}
+		if err := strategy.initialize(config); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func setupRoute(config *configs.Config) error {
+	for _, config := range config.Routes {
+		if err := netlink.AddRoute(config.Destination, config.Source, config.Gateway, config.InterfaceName); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func setupRlimits(config *configs.Config) error {
+	for _, rlimit := range config.Rlimits {
+		l := &syscall.Rlimit{Max: rlimit.Hard, Cur: rlimit.Soft}
+		if err := syscall.Setrlimit(rlimit.Type, l); err != nil {
+			return fmt.Errorf("error setting rlimit type %v: %v", rlimit.Type, err)
+		}
+	}
+	return nil
+}
+
+// killCgroupProcesses freezes then iterates over all the processes inside the
+// manager's cgroups sending a SIGKILL to each process then waiting for them to
+// exit.
+func killCgroupProcesses(m cgroups.Manager) error {
+	var procs []*os.Process
+	if err := m.Freeze(configs.Frozen); err != nil {
+		logrus.Warn(err)
+	}
+	pids, err := m.GetPids()
+	if err != nil {
+		m.Freeze(configs.Thawed)
+		return err
+	}
+	for _, pid := range pids {
+		if p, err := os.FindProcess(pid); err == nil {
+			procs = append(procs, p)
+			if err := p.Kill(); err != nil {
+				logrus.Warn(err)
+			}
+		}
+	}
+	if err := m.Freeze(configs.Thawed); err != nil {
+		logrus.Warn(err)
+	}
+	for _, p := range procs {
+		if _, err := p.Wait(); err != nil {
+			logrus.Warn(err)
+		}
+	}
+	return nil
+}
+
+func finalizeSeccomp(config *initConfig) error {
+	if config.Config.Seccomp == nil {
+		return nil
+	}
+	context := seccomp.New()
+	for _, s := range config.Config.Seccomp.Syscalls {
+		ss := &seccomp.Syscall{
+			Value:  uint32(s.Value),
+			Action: seccompAction(s.Action),
+		}
+		if len(s.Args) > 0 {
+			ss.Args = seccompArgs(s.Args)
+		}
+		context.Add(ss)
+	}
+	return context.Load()
+}
+
+func seccompAction(a configs.Action) seccomp.Action {
+	switch a {
+	case configs.Kill:
+		return seccomp.Kill
+	case configs.Trap:
+		return seccomp.Trap
+	case configs.Allow:
+		return seccomp.Allow
+	}
+	return seccomp.Error(syscall.Errno(int(a)))
+}
+
+func seccompArgs(args []*configs.Arg) seccomp.Args {
+	var sa []seccomp.Arg
+	for _, a := range args {
+		sa = append(sa, seccomp.Arg{
+			Index: uint32(a.Index),
+			Op:    seccompOperator(a.Op),
+			Value: uint(a.Value),
+		})
+	}
+	return seccomp.Args{sa}
+}
+
+func seccompOperator(o configs.Operator) seccomp.Operator {
+	switch o {
+	case configs.EqualTo:
+		return seccomp.EqualTo
+	case configs.NotEqualTo:
+		return seccomp.NotEqualTo
+	case configs.GreatherThan:
+		return seccomp.GreatherThan
+	case configs.LessThan:
+		return seccomp.LessThan
+	case configs.MaskEqualTo:
+		return seccomp.MaskEqualTo
+	}
+	return 0
+}