rancher/os
1
0
Fork 1
mirror of https://github.com/rancher/os.git synced 2025-09-01 14:48:55 +00:00
Code Issues Releases Wiki Activity

Bump libcompose and its dependencies

Browse Source
This commit is contained in:
Josh Curl
2016-05-23 17:22:40 -07:00
parent c18cd26e78
commit 50de80d09a
1109 changed files with 35052 additions and 125685 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
vendor/github.com/opencontainers/runc/libcontainer/nsenter/README.md generated vendored
View File

@@ -1,25 +0,0 @@
## nsenter
The `nsenter` package registers a special init constructor that is called before
the Go runtime has a chance to boot. This provides us the ability to `setns` on
existing namespaces and avoid the issues that the Go runtime has with multiple
threads. This constructor will be called if this package is registered,
imported, in your go application.
The `nsenter` package will `import "C"` and it uses [cgo](https://golang.org/cmd/cgo/)
package. In cgo, if the import of "C" is immediately preceded by a comment, that comment,
called the preamble, is used as a header when compiling the C parts of the package.
So every time we import package `nsenter`, the C code function `nsexec()` would be
called. And package `nsenter` is now only imported in Docker execdriver, so every time
before we call `execdriver.Exec()`, that C code would run.
`nsexec()` will first check the environment variable `_LIBCONTAINER_INITPID`
which will give the process of the container that should be joined. Namespaces fd will
be found from `/proc/[pid]/ns` and set by `setns` syscall.
And then get the pipe number from `_LIBCONTAINER_INITPIPE`, error message could
be transfered through it. If tty is added, `_LIBCONTAINER_CONSOLE_PATH` will
have value and start a console for output.
Finally, `nsexec()` will clone a child process , exit the parent process and let
the Go runtime take over.

12
vendor/github.com/opencontainers/runc/libcontainer/nsenter/nsenter.go generated vendored
View File

@@ -1,12 +0,0 @@
// +build linux,!gccgo
package nsenter
/*
#cgo CFLAGS: -Wall
extern void nsexec();
void __attribute__((constructor)) init(void) {
nsexec();
}
*/
import "C"

25
vendor/github.com/opencontainers/runc/libcontainer/nsenter/nsenter_gccgo.go generated vendored
View File

@@ -1,25 +0,0 @@
// +build linux,gccgo
package nsenter
/*
#cgo CFLAGS: -Wall
extern void nsexec();
void __attribute__((constructor)) init(void) {
nsexec();
}
*/
import "C"
// AlwaysFalse is here to stay false
// (and be exported so the compiler doesn't optimize out its reference)
var AlwaysFalse bool
func init() {
if AlwaysFalse {
// by referencing this C init() in a noop test, it will ensure the compiler
// links in the C function.
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65134
C.init()
}
}

91
vendor/github.com/opencontainers/runc/libcontainer/nsenter/nsenter_test.go generated vendored
View File

@@ -1,91 +0,0 @@
package nsenter
import (
"encoding/json"
"fmt"
"os"
"os/exec"
"strings"
"testing"
)
type pid struct {
Pid int `json:"Pid"`
}
func TestNsenterAlivePid(t *testing.T) {
args := []string{"nsenter-exec"}
r, w, err := os.Pipe()
if err != nil {
t.Fatalf("failed to create pipe %v", err)
}
cmd := &exec.Cmd{
Path: os.Args[0],
Args: args,
ExtraFiles: []*os.File{w},
Env: []string{fmt.Sprintf("_LIBCONTAINER_INITPID=%d", os.Getpid()), "_LIBCONTAINER_INITPIPE=3"},
}
if err := cmd.Start(); err != nil {
t.Fatalf("nsenter failed to start %v", err)
}
w.Close()
decoder := json.NewDecoder(r)
var pid *pid
if err := decoder.Decode(&pid); err != nil {
t.Fatalf("%v", err)
}
if err := cmd.Wait(); err != nil {
t.Fatalf("nsenter exits with a non-zero exit status")
}
p, err := os.FindProcess(pid.Pid)
if err != nil {
t.Fatalf("%v", err)
}
p.Wait()
}
func TestNsenterInvalidPid(t *testing.T) {
args := []string{"nsenter-exec"}
cmd := &exec.Cmd{
Path: os.Args[0],
Args: args,
Env: []string{"_LIBCONTAINER_INITPID=-1"},
}
err := cmd.Run()
if err == nil {
t.Fatal("nsenter exits with a zero exit status")
}
}
func TestNsenterDeadPid(t *testing.T) {
dead_cmd := exec.Command("true")
if err := dead_cmd.Run(); err != nil {
t.Fatal(err)
}
args := []string{"nsenter-exec"}
cmd := &exec.Cmd{
Path: os.Args[0],
Args: args,
Env: []string{fmt.Sprintf("_LIBCONTAINER_INITPID=%d", dead_cmd.Process.Pid)},
}
err := cmd.Run()
if err == nil {
t.Fatal("nsenter exits with a zero exit status")
}
}
func init() {
if strings.HasPrefix(os.Args[0], "nsenter-") {
os.Exit(0)
}
return
}

5
vendor/github.com/opencontainers/runc/libcontainer/nsenter/nsenter_unsupported.go generated vendored
View File

@@ -1,5 +0,0 @@
// +build !linux !cgo
package nsenter
import "C"

206
vendor/github.com/opencontainers/runc/libcontainer/nsenter/nsexec.c generated vendored
View File

@@ -1,206 +0,0 @@
#define _GNU_SOURCE
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <linux/limits.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <signal.h>
#include <setjmp.h>
#include <sched.h>
#include <signal.h>
/* All arguments should be above stack, because it grows down */
struct clone_arg {
/*
* Reserve some space for clone() to locate arguments
* and retcode in this place
*/
char stack[4096] __attribute__ ((aligned(16)));
char stack_ptr[0];
jmp_buf *env;
};
#define pr_perror(fmt, ...) fprintf(stderr, "nsenter: " fmt ": %m\n", ##__VA_ARGS__)
static int child_func(void *_arg)
{
struct clone_arg *arg = (struct clone_arg *)_arg;
longjmp(*arg->env, 1);
}
// Use raw setns syscall for versions of glibc that don't include it (namely glibc-2.12)
#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 14
#define _GNU_SOURCE
#include "syscall.h"
#if defined(__NR_setns) && !defined(SYS_setns)
#define SYS_setns __NR_setns
#endif
#ifdef SYS_setns
int setns(int fd, int nstype)
{
return syscall(SYS_setns, fd, nstype);
}
#endif
#endif
static int clone_parent(jmp_buf * env) __attribute__ ((noinline));
static int clone_parent(jmp_buf * env)
{
struct clone_arg ca;
int child;
ca.env = env;
child = clone(child_func, ca.stack_ptr, CLONE_PARENT | SIGCHLD, &ca);
return child;
}
void nsexec()
{
char *namespaces[] = { "ipc", "uts", "net", "pid", "mnt", "user" };
const int num = sizeof(namespaces) / sizeof(char *);
jmp_buf env;
char buf[PATH_MAX], *val;
int i, tfd, self_tfd, child, len, pipenum, consolefd = -1;
pid_t pid;
char *console;
val = getenv("_LIBCONTAINER_INITPID");
if (val == NULL)
return;
pid = atoi(val);
snprintf(buf, sizeof(buf), "%d", pid);
if (strcmp(val, buf)) {
pr_perror("Unable to parse _LIBCONTAINER_INITPID");
exit(1);
}
val = getenv("_LIBCONTAINER_INITPIPE");
if (val == NULL) {
pr_perror("Child pipe not found");
exit(1);
}
pipenum = atoi(val);
snprintf(buf, sizeof(buf), "%d", pipenum);
if (strcmp(val, buf)) {
pr_perror("Unable to parse _LIBCONTAINER_INITPIPE");
exit(1);
}
console = getenv("_LIBCONTAINER_CONSOLE_PATH");
if (console != NULL) {
consolefd = open(console, O_RDWR);
if (consolefd < 0) {
pr_perror("Failed to open console %s", console);
exit(1);
}
}
/* Check that the specified process exists */
snprintf(buf, PATH_MAX - 1, "/proc/%d/ns", pid);
tfd = open(buf, O_DIRECTORY | O_RDONLY);
if (tfd == -1) {
pr_perror("Failed to open \"%s\"", buf);
exit(1);
}
self_tfd = open("/proc/self/ns", O_DIRECTORY | O_RDONLY);
if (self_tfd == -1) {
pr_perror("Failed to open /proc/self/ns");
exit(1);
}
for (i = 0; i < num; i++) {
struct stat st;
struct stat self_st;
int fd;
/* Symlinks on all namespaces exist for dead processes, but they can't be opened */
if (fstatat(tfd, namespaces[i], &st, 0) == -1) {
// Ignore nonexistent namespaces.
if (errno == ENOENT)
continue;
}
/* Skip namespaces we're already part of */
if (fstatat(self_tfd, namespaces[i], &self_st, 0) != -1 &&
st.st_ino == self_st.st_ino) {
continue;
}
fd = openat(tfd, namespaces[i], O_RDONLY);
if (fd == -1) {
pr_perror("Failed to open ns file %s for ns %s", buf,
namespaces[i]);
exit(1);
}
// Set the namespace.
if (setns(fd, 0) == -1) {
pr_perror("Failed to setns for %s", namespaces[i]);
exit(1);
}
close(fd);
}
close(self_tfd);
close(tfd);
if (setjmp(env) == 1) {
// Child
if (setsid() == -1) {
pr_perror("setsid failed");
exit(1);
}
if (consolefd != -1) {
if (ioctl(consolefd, TIOCSCTTY, 0) == -1) {
pr_perror("ioctl TIOCSCTTY failed");
exit(1);
}
if (dup3(consolefd, STDIN_FILENO, 0) != STDIN_FILENO) {
pr_perror("Failed to dup 0");
exit(1);
}
if (dup3(consolefd, STDOUT_FILENO, 0) != STDOUT_FILENO) {
pr_perror("Failed to dup 1");
exit(1);
}
if (dup3(consolefd, STDERR_FILENO, 0) != STDERR_FILENO) {
pr_perror("Failed to dup 2");
exit(1);
}
}
// Finish executing, let the Go runtime take over.
return;
}
// Parent
// We must fork to actually enter the PID namespace, use CLONE_PARENT
// so the child can have the right parent, and we don't need to forward
// the child's exit code or resend its death signal.
child = clone_parent(&env);
if (child < 0) {
pr_perror("Unable to fork");
exit(1);
}
len = snprintf(buf, sizeof(buf), "{ \"pid\" : %d }\n", child);
if (write(pipenum, buf, len) != len) {
pr_perror("Unable to send a child pid");
kill(child, SIGKILL);
exit(1);
}
exit(0);
}