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moby--moby/daemon/execdriver/native/exec.go
Alexander Morozov 68ba5f0b69 Execdriver implementation on new libcontainer API
Signed-off-by: Alexander Morozov <lk4d4@docker.com>
2015-03-06 14:46:58 -08:00

80 lines
1.7 KiB
Go

// +build linux
package native
import (
"fmt"
"os"
"os/exec"
"syscall"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/libcontainer"
_ "github.com/docker/libcontainer/nsenter"
"github.com/docker/libcontainer/utils"
)
// TODO(vishh): Add support for running in priviledged mode and running as a different user.
func (d *driver) Exec(c *execdriver.Command, processConfig *execdriver.ProcessConfig, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
active := d.activeContainers[c.ID]
if active == nil {
return -1, fmt.Errorf("No active container exists with ID %s", c.ID)
}
var term execdriver.Terminal
var err error
p := &libcontainer.Process{
Args: append([]string{processConfig.Entrypoint}, processConfig.Arguments...),
Env: c.ProcessConfig.Env,
Cwd: c.WorkingDir,
User: c.ProcessConfig.User,
}
if processConfig.Tty {
config := active.Config()
rootuid, err := config.HostUID()
if err != nil {
return -1, err
}
cons, err := p.NewConsole(rootuid)
if err != nil {
return -1, err
}
term, err = NewTtyConsole(cons, pipes, rootuid)
} else {
p.Stdout = pipes.Stdout
p.Stderr = pipes.Stderr
p.Stdin = pipes.Stdin
term = &execdriver.StdConsole{}
}
if err != nil {
return -1, err
}
processConfig.Terminal = term
if err := active.Start(p); err != nil {
return -1, err
}
if startCallback != nil {
pid, err := p.Pid()
if err != nil {
p.Signal(os.Kill)
p.Wait()
return -1, err
}
startCallback(&c.ProcessConfig, pid)
}
ps, err := p.Wait()
if err != nil {
exitErr, ok := err.(*exec.ExitError)
if !ok {
return -1, err
}
ps = exitErr.ProcessState
}
return utils.ExitStatus(ps.Sys().(syscall.WaitStatus)), nil
}