runc/console/console.go

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// +build linux
package console
import (
"fmt"
"os"
"path/filepath"
"syscall"
"github.com/dotcloud/docker/pkg/label"
"github.com/dotcloud/docker/pkg/system"
)
// Setup initializes the proper /dev/console inside the rootfs path
func Setup(rootfs, consolePath, mountLabel string) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
stat, err := os.Stat(consolePath)
if err != nil {
return fmt.Errorf("stat console %s %s", consolePath, err)
}
var (
st = stat.Sys().(*syscall.Stat_t)
dest = filepath.Join(rootfs, "dev/console")
)
if err := os.Remove(dest); err != nil && !os.IsNotExist(err) {
return fmt.Errorf("remove %s %s", dest, err)
}
if err := os.Chmod(consolePath, 0600); err != nil {
return err
}
if err := os.Chown(consolePath, 0, 0); err != nil {
return err
}
if err := system.Mknod(dest, (st.Mode&^07777)|0600, int(st.Rdev)); err != nil {
return fmt.Errorf("mknod %s %s", dest, err)
}
if err := label.SetFileLabel(consolePath, mountLabel); err != nil {
return fmt.Errorf("set file label %s %s", dest, err)
}
if err := system.Mount(consolePath, dest, "bind", syscall.MS_BIND, ""); err != nil {
return fmt.Errorf("bind %s to %s %s", consolePath, dest, err)
}
return nil
}
func OpenAndDup(consolePath string) error {
slave, err := system.OpenTerminal(consolePath, syscall.O_RDWR)
if err != nil {
return fmt.Errorf("open terminal %s", err)
}
if err := system.Dup2(slave.Fd(), 0); err != nil {
return err
}
if err := system.Dup2(slave.Fd(), 1); err != nil {
return err
}
return system.Dup2(slave.Fd(), 2)
}