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