76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
|
// +build linux
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"encoding/json"
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
|
||
|
|
"github.com/Sirupsen/logrus"
|
||
|
|
"github.com/codegangsta/cli"
|
||
|
|
"github.com/opencontainers/specs"
|
||
|
|
)
|
||
|
|
|
||
|
|
var execCommand = cli.Command{
|
||
|
|
Name: "exec",
|
||
|
|
Usage: "execute new process inside the container",
|
||
|
|
Action: func(context *cli.Context) {
|
||
|
|
config, err := loadProcessConfig(context.Args().First())
|
||
|
|
if err != nil {
|
||
|
|
fatal(err)
|
||
|
|
}
|
||
|
|
if os.Geteuid() != 0 {
|
||
|
|
logrus.Fatal("runc should be run as root")
|
||
|
|
}
|
||
|
|
if config.Args == nil {
|
||
|
|
logrus.Fatal("args missing in process configuration")
|
||
|
|
}
|
||
|
|
status, err := execProcess(context, config)
|
||
|
|
if err != nil {
|
||
|
|
logrus.Fatalf("exec failed: %v", err)
|
||
|
|
}
|
||
|
|
os.Exit(status)
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
func execProcess(context *cli.Context, config *specs.Process) (int, error) {
|
||
|
|
container, err := getContainer(context)
|
||
|
|
if err != nil {
|
||
|
|
return -1, err
|
||
|
|
}
|
||
|
|
process := newProcess(*config)
|
||
|
|
|
||
|
|
rootuid, err := container.Config().HostUID()
|
||
|
|
if err != nil {
|
||
|
|
return -1, err
|
||
|
|
}
|
||
|
|
tty, err := newTty(config.Terminal, process, rootuid)
|
||
|
|
if err != nil {
|
||
|
|
return -1, err
|
||
|
|
}
|
||
|
|
handler := newSignalHandler(tty)
|
||
|
|
defer handler.Close()
|
||
|
|
if err := container.Start(process); err != nil {
|
||
|
|
return -1, err
|
||
|
|
}
|
||
|
|
return handler.forward(process)
|
||
|
|
}
|
||
|
|
|
||
|
|
// loadProcessConfig loads the process configuration from the provided path.
|
||
|
|
func loadProcessConfig(path string) (*specs.Process, error) {
|
||
|
|
f, err := os.Open(path)
|
||
|
|
if err != nil {
|
||
|
|
if os.IsNotExist(err) {
|
||
|
|
return nil, fmt.Errorf("JSON configuration file for %s not found", path)
|
||
|
|
}
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
defer f.Close()
|
||
|
|
var s *specs.Process
|
||
|
|
if err := json.NewDecoder(f).Decode(&s); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
return s, nil
|
||
|
|
}
|