126 lines
2.8 KiB
Go
126 lines
2.8 KiB
Go
package oci
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"os/exec"
|
|
"path/filepath"
|
|
"strconv"
|
|
"syscall"
|
|
|
|
"github.com/docker/containerkit"
|
|
)
|
|
|
|
func New(root, name, log string) (*OCIRuntime, error) {
|
|
if err := os.MkdirAll(root, 0711); err != nil {
|
|
return nil, err
|
|
}
|
|
return &OCIRuntime{
|
|
root: root,
|
|
log: log,
|
|
name: name,
|
|
}, nil
|
|
}
|
|
|
|
type OCIRuntime struct {
|
|
// root holds runtime state information for the containers
|
|
// launched by the runtime
|
|
root string
|
|
// name is the name of the runtime, i.e. runc
|
|
name string
|
|
// log is the path to the log files for the containers
|
|
log string
|
|
}
|
|
|
|
func (r *OCIRuntime) Create(c *containerkit.Container) (containerkit.ProcessDelegate, error) {
|
|
pidFile := fmt.Sprintf("%s/%s.pid", filepath.Join(r.root, c.ID()), "init")
|
|
cmd := r.command("create", "--pid-file", pidFile, "--bundle", c.Path(), c.ID())
|
|
cmd.Stdin, cmd.Stdout, cmd.Stderr = c.Stdin, c.Stdout, c.Stderr
|
|
if err := cmd.Run(); err != nil {
|
|
return nil, err
|
|
}
|
|
data, err := ioutil.ReadFile(pidFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i, err := strconv.Atoi(string(data))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return newProcess(i)
|
|
}
|
|
|
|
func (r *OCIRuntime) Start(c *containerkit.Container) error {
|
|
return r.command("start", c.ID()).Run()
|
|
}
|
|
|
|
func (r *OCIRuntime) Delete(c *containerkit.Container) error {
|
|
return r.command("delete", c.ID()).Run()
|
|
}
|
|
|
|
func (r *OCIRuntime) Exec(c *containerkit.Container, p *containerkit.Process) (containerkit.ProcessDelegate, error) {
|
|
f, err := ioutil.TempFile(filepath.Join(r.root, c.ID()), "process")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
path := f.Name()
|
|
pidFile := fmt.Sprintf("%s/%s.pid", filepath.Join(r.root, c.ID()), filepath.Base(path))
|
|
err = json.NewEncoder(f).Encode(p.Spec())
|
|
f.Close()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cmd := r.command("exec", "--detach", "--process", path, "--pid-file", pidFile, c.ID())
|
|
cmd.Stdin, cmd.Stdout, cmd.Stderr = p.Stdin, p.Stdout, p.Stderr
|
|
if err := cmd.Run(); err != nil {
|
|
return nil, err
|
|
}
|
|
data, err := ioutil.ReadFile(pidFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i, err := strconv.Atoi(string(data))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return newProcess(i)
|
|
}
|
|
|
|
func (r *OCIRuntime) command(args ...string) *exec.Cmd {
|
|
return exec.Command(r.name, append([]string{
|
|
"--root", r.root,
|
|
"--log", r.log,
|
|
}, args...)...)
|
|
}
|
|
|
|
func newProcess(pid int) (*process, error) {
|
|
proc, err := os.FindProcess(pid)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &process{
|
|
proc: proc,
|
|
}, nil
|
|
}
|
|
|
|
type process struct {
|
|
proc *os.Process
|
|
}
|
|
|
|
func (p *process) Pid() int {
|
|
return p.proc.Pid
|
|
}
|
|
|
|
func (p *process) Wait() (uint32, error) {
|
|
state, err := p.proc.Wait()
|
|
if err != nil {
|
|
return 0, nil
|
|
}
|
|
return uint32(state.Sys().(syscall.WaitStatus).ExitStatus()), nil
|
|
}
|
|
|
|
func (p *process) Signal(s os.Signal) error {
|
|
return p.proc.Signal(s)
|
|
}
|