Revert "Switch to new vendor directory layout"

This reverts commit d5742209d3.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

vendor/github.com/opencontainers/runc/libcontainer/system/linux.go

@@ -1,122 +0,0 @@
-// +build linux
-
-package system
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-	"os/exec"
-	"syscall"
-	"unsafe"
-)
-
-type ParentDeathSignal int
-
-func (p ParentDeathSignal) Restore() error {
-	if p == 0 {
-		return nil
-	}
-	current, err := GetParentDeathSignal()
-	if err != nil {
-		return err
-	}
-	if p == current {
-		return nil
-	}
-	return p.Set()
-}
-
-func (p ParentDeathSignal) Set() error {
-	return SetParentDeathSignal(uintptr(p))
-}
-
-func Execv(cmd string, args []string, env []string) error {
-	name, err := exec.LookPath(cmd)
-	if err != nil {
-		return err
-	}
-
-	return syscall.Exec(name, args, env)
-}
-
-func SetParentDeathSignal(sig uintptr) error {
-	if _, _, err := syscall.RawSyscall(syscall.SYS_PRCTL, syscall.PR_SET_PDEATHSIG, sig, 0); err != 0 {
-		return err
-	}
-	return nil
-}
-
-func GetParentDeathSignal() (ParentDeathSignal, error) {
-	var sig int
-	_, _, err := syscall.RawSyscall(syscall.SYS_PRCTL, syscall.PR_GET_PDEATHSIG, uintptr(unsafe.Pointer(&sig)), 0)
-	if err != 0 {
-		return -1, err
-	}
-	return ParentDeathSignal(sig), nil
-}
-
-func SetKeepCaps() error {
-	if _, _, err := syscall.RawSyscall(syscall.SYS_PRCTL, syscall.PR_SET_KEEPCAPS, 1, 0); err != 0 {
-		return err
-	}
-
-	return nil
-}
-
-func ClearKeepCaps() error {
-	if _, _, err := syscall.RawSyscall(syscall.SYS_PRCTL, syscall.PR_SET_KEEPCAPS, 0, 0); err != 0 {
-		return err
-	}
-
-	return nil
-}
-
-func Setctty() error {
-	if _, _, err := syscall.RawSyscall(syscall.SYS_IOCTL, 0, uintptr(syscall.TIOCSCTTY), 0); err != 0 {
-		return err
-	}
-	return nil
-}
-
-/*
- * Detect whether we are currently running in a user namespace.
- * Copied from github.com/lxc/lxd/shared/util.go
- */
-func RunningInUserNS() bool {
-	file, err := os.Open("/proc/self/uid_map")
-	if err != nil {
-		/*
-		 * This kernel-provided file only exists if user namespaces are
-		 * supported
-		 */
-		return false
-	}
-	defer file.Close()
-
-	buf := bufio.NewReader(file)
-	l, _, err := buf.ReadLine()
-	if err != nil {
-		return false
-	}
-
-	line := string(l)
-	var a, b, c int64
-	fmt.Sscanf(line, "%d %d %d", &a, &b, &c)
-	/*
-	 * We assume we are in the initial user namespace if we have a full
-	 * range - 4294967295 uids starting at uid 0.
-	 */
-	if a == 0 && b == 0 && c == 4294967295 {
-		return false
-	}
-	return true
-}
-
-func Prctl(option int, arg2, arg3, arg4, arg5 uintptr) (err error) {
-	_, _, e1 := syscall.Syscall6(syscall.SYS_PRCTL, uintptr(option), arg2, arg3, arg4, arg5, 0)
-	if e1 != 0 {
-		err = e1
-	}
-	return
-}