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moby--moby/vendor/github.com/containerd/go-runc/runc.go
John Howard e57b2a8066 Bump containerd to d97a907f
Signed-off-by: John Howard <jhoward@microsoft.com>
2018-09-18 10:26:13 -07:00

707 lines
17 KiB
Go

/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package runc
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
// Format is the type of log formatting options avaliable
type Format string
// TopBody represents the structured data of the full ps output
type TopResults struct {
// Processes running in the container, where each is process is an array of values corresponding to the headers
Processes [][]string `json:"Processes"`
// Headers are the names of the columns
Headers []string `json:"Headers"`
}
const (
none Format = ""
JSON Format = "json"
Text Format = "text"
// DefaultCommand is the default command for Runc
DefaultCommand = "runc"
)
// Runc is the client to the runc cli
type Runc struct {
//If command is empty, DefaultCommand is used
Command string
Root string
Debug bool
Log string
LogFormat Format
PdeathSignal syscall.Signal
Setpgid bool
Criu string
SystemdCgroup bool
Rootless *bool // nil stands for "auto"
}
// List returns all containers created inside the provided runc root directory
func (r *Runc) List(context context.Context) ([]*Container, error) {
data, err := cmdOutput(r.command(context, "list", "--format=json"), false)
if err != nil {
return nil, err
}
var out []*Container
if err := json.Unmarshal(data, &out); err != nil {
return nil, err
}
return out, nil
}
// State returns the state for the container provided by id
func (r *Runc) State(context context.Context, id string) (*Container, error) {
data, err := cmdOutput(r.command(context, "state", id), true)
if err != nil {
return nil, fmt.Errorf("%s: %s", err, data)
}
var c Container
if err := json.Unmarshal(data, &c); err != nil {
return nil, err
}
return &c, nil
}
type ConsoleSocket interface {
Path() string
}
type CreateOpts struct {
IO
// PidFile is a path to where a pid file should be created
PidFile string
ConsoleSocket ConsoleSocket
Detach bool
NoPivot bool
NoNewKeyring bool
ExtraFiles []*os.File
}
func (o *CreateOpts) args() (out []string, err error) {
if o.PidFile != "" {
abs, err := filepath.Abs(o.PidFile)
if err != nil {
return nil, err
}
out = append(out, "--pid-file", abs)
}
if o.ConsoleSocket != nil {
out = append(out, "--console-socket", o.ConsoleSocket.Path())
}
if o.NoPivot {
out = append(out, "--no-pivot")
}
if o.NoNewKeyring {
out = append(out, "--no-new-keyring")
}
if o.Detach {
out = append(out, "--detach")
}
if o.ExtraFiles != nil {
out = append(out, "--preserve-fds", strconv.Itoa(len(o.ExtraFiles)))
}
return out, nil
}
// Create creates a new container and returns its pid if it was created successfully
func (r *Runc) Create(context context.Context, id, bundle string, opts *CreateOpts) error {
args := []string{"create", "--bundle", bundle}
if opts != nil {
oargs, err := opts.args()
if err != nil {
return err
}
args = append(args, oargs...)
}
cmd := r.command(context, append(args, id)...)
if opts != nil && opts.IO != nil {
opts.Set(cmd)
}
cmd.ExtraFiles = opts.ExtraFiles
if cmd.Stdout == nil && cmd.Stderr == nil {
data, err := cmdOutput(cmd, true)
if err != nil {
return fmt.Errorf("%s: %s", err, data)
}
return nil
}
ec, err := Monitor.Start(cmd)
if err != nil {
return err
}
if opts != nil && opts.IO != nil {
if c, ok := opts.IO.(StartCloser); ok {
if err := c.CloseAfterStart(); err != nil {
return err
}
}
}
status, err := Monitor.Wait(cmd, ec)
if err == nil && status != 0 {
err = fmt.Errorf("%s did not terminate sucessfully", cmd.Args[0])
}
return err
}
// Start will start an already created container
func (r *Runc) Start(context context.Context, id string) error {
return r.runOrError(r.command(context, "start", id))
}
type ExecOpts struct {
IO
PidFile string
ConsoleSocket ConsoleSocket
Detach bool
}
func (o *ExecOpts) args() (out []string, err error) {
if o.ConsoleSocket != nil {
out = append(out, "--console-socket", o.ConsoleSocket.Path())
}
if o.Detach {
out = append(out, "--detach")
}
if o.PidFile != "" {
abs, err := filepath.Abs(o.PidFile)
if err != nil {
return nil, err
}
out = append(out, "--pid-file", abs)
}
return out, nil
}
// Exec executres and additional process inside the container based on a full
// OCI Process specification
func (r *Runc) Exec(context context.Context, id string, spec specs.Process, opts *ExecOpts) error {
f, err := ioutil.TempFile(os.Getenv("XDG_RUNTIME_DIR"), "runc-process")
if err != nil {
return err
}
defer os.Remove(f.Name())
err = json.NewEncoder(f).Encode(spec)
f.Close()
if err != nil {
return err
}
args := []string{"exec", "--process", f.Name()}
if opts != nil {
oargs, err := opts.args()
if err != nil {
return err
}
args = append(args, oargs...)
}
cmd := r.command(context, append(args, id)...)
if opts != nil && opts.IO != nil {
opts.Set(cmd)
}
if cmd.Stdout == nil && cmd.Stderr == nil {
data, err := cmdOutput(cmd, true)
if err != nil {
return fmt.Errorf("%s: %s", err, data)
}
return nil
}
ec, err := Monitor.Start(cmd)
if err != nil {
return err
}
if opts != nil && opts.IO != nil {
if c, ok := opts.IO.(StartCloser); ok {
if err := c.CloseAfterStart(); err != nil {
return err
}
}
}
status, err := Monitor.Wait(cmd, ec)
if err == nil && status != 0 {
err = fmt.Errorf("%s did not terminate sucessfully", cmd.Args[0])
}
return err
}
// Run runs the create, start, delete lifecycle of the container
// and returns its exit status after it has exited
func (r *Runc) Run(context context.Context, id, bundle string, opts *CreateOpts) (int, error) {
args := []string{"run", "--bundle", bundle}
if opts != nil {
oargs, err := opts.args()
if err != nil {
return -1, err
}
args = append(args, oargs...)
}
cmd := r.command(context, append(args, id)...)
if opts != nil && opts.IO != nil {
opts.Set(cmd)
}
ec, err := Monitor.Start(cmd)
if err != nil {
return -1, err
}
return Monitor.Wait(cmd, ec)
}
type DeleteOpts struct {
Force bool
}
func (o *DeleteOpts) args() (out []string) {
if o.Force {
out = append(out, "--force")
}
return out
}
// Delete deletes the container
func (r *Runc) Delete(context context.Context, id string, opts *DeleteOpts) error {
args := []string{"delete"}
if opts != nil {
args = append(args, opts.args()...)
}
return r.runOrError(r.command(context, append(args, id)...))
}
// KillOpts specifies options for killing a container and its processes
type KillOpts struct {
All bool
}
func (o *KillOpts) args() (out []string) {
if o.All {
out = append(out, "--all")
}
return out
}
// Kill sends the specified signal to the container
func (r *Runc) Kill(context context.Context, id string, sig int, opts *KillOpts) error {
args := []string{
"kill",
}
if opts != nil {
args = append(args, opts.args()...)
}
return r.runOrError(r.command(context, append(args, id, strconv.Itoa(sig))...))
}
// Stats return the stats for a container like cpu, memory, and io
func (r *Runc) Stats(context context.Context, id string) (*Stats, error) {
cmd := r.command(context, "events", "--stats", id)
rd, err := cmd.StdoutPipe()
if err != nil {
return nil, err
}
ec, err := Monitor.Start(cmd)
if err != nil {
return nil, err
}
defer func() {
rd.Close()
Monitor.Wait(cmd, ec)
}()
var e Event
if err := json.NewDecoder(rd).Decode(&e); err != nil {
return nil, err
}
return e.Stats, nil
}
// Events returns an event stream from runc for a container with stats and OOM notifications
func (r *Runc) Events(context context.Context, id string, interval time.Duration) (chan *Event, error) {
cmd := r.command(context, "events", fmt.Sprintf("--interval=%ds", int(interval.Seconds())), id)
rd, err := cmd.StdoutPipe()
if err != nil {
return nil, err
}
ec, err := Monitor.Start(cmd)
if err != nil {
rd.Close()
return nil, err
}
var (
dec = json.NewDecoder(rd)
c = make(chan *Event, 128)
)
go func() {
defer func() {
close(c)
rd.Close()
Monitor.Wait(cmd, ec)
}()
for {
var e Event
if err := dec.Decode(&e); err != nil {
if err == io.EOF {
return
}
e = Event{
Type: "error",
Err: err,
}
}
c <- &e
}
}()
return c, nil
}
// Pause the container with the provided id
func (r *Runc) Pause(context context.Context, id string) error {
return r.runOrError(r.command(context, "pause", id))
}
// Resume the container with the provided id
func (r *Runc) Resume(context context.Context, id string) error {
return r.runOrError(r.command(context, "resume", id))
}
// Ps lists all the processes inside the container returning their pids
func (r *Runc) Ps(context context.Context, id string) ([]int, error) {
data, err := cmdOutput(r.command(context, "ps", "--format", "json", id), true)
if err != nil {
return nil, fmt.Errorf("%s: %s", err, data)
}
var pids []int
if err := json.Unmarshal(data, &pids); err != nil {
return nil, err
}
return pids, nil
}
// Top lists all the processes inside the container returning the full ps data
func (r *Runc) Top(context context.Context, id string, psOptions string) (*TopResults, error) {
data, err := cmdOutput(r.command(context, "ps", "--format", "table", id, psOptions), true)
if err != nil {
return nil, fmt.Errorf("%s: %s", err, data)
}
topResults, err := ParsePSOutput(data)
if err != nil {
return nil, fmt.Errorf("%s: ", err)
}
return topResults, nil
}
type CheckpointOpts struct {
// ImagePath is the path for saving the criu image file
ImagePath string
// WorkDir is the working directory for criu
WorkDir string
// ParentPath is the path for previous image files from a pre-dump
ParentPath string
// AllowOpenTCP allows open tcp connections to be checkpointed
AllowOpenTCP bool
// AllowExternalUnixSockets allows external unix sockets to be checkpointed
AllowExternalUnixSockets bool
// AllowTerminal allows the terminal(pty) to be checkpointed with a container
AllowTerminal bool
// CriuPageServer is the address:port for the criu page server
CriuPageServer string
// FileLocks handle file locks held by the container
FileLocks bool
// Cgroups is the cgroup mode for how to handle the checkpoint of a container's cgroups
Cgroups CgroupMode
// EmptyNamespaces creates a namespace for the container but does not save its properties
// Provide the namespaces you wish to be checkpointed without their settings on restore
EmptyNamespaces []string
}
type CgroupMode string
const (
Soft CgroupMode = "soft"
Full CgroupMode = "full"
Strict CgroupMode = "strict"
)
func (o *CheckpointOpts) args() (out []string) {
if o.ImagePath != "" {
out = append(out, "--image-path", o.ImagePath)
}
if o.WorkDir != "" {
out = append(out, "--work-path", o.WorkDir)
}
if o.ParentPath != "" {
out = append(out, "--parent-path", o.ParentPath)
}
if o.AllowOpenTCP {
out = append(out, "--tcp-established")
}
if o.AllowExternalUnixSockets {
out = append(out, "--ext-unix-sk")
}
if o.AllowTerminal {
out = append(out, "--shell-job")
}
if o.CriuPageServer != "" {
out = append(out, "--page-server", o.CriuPageServer)
}
if o.FileLocks {
out = append(out, "--file-locks")
}
if string(o.Cgroups) != "" {
out = append(out, "--manage-cgroups-mode", string(o.Cgroups))
}
for _, ns := range o.EmptyNamespaces {
out = append(out, "--empty-ns", ns)
}
return out
}
type CheckpointAction func([]string) []string
// LeaveRunning keeps the container running after the checkpoint has been completed
func LeaveRunning(args []string) []string {
return append(args, "--leave-running")
}
// PreDump allows a pre-dump of the checkpoint to be made and completed later
func PreDump(args []string) []string {
return append(args, "--pre-dump")
}
// Checkpoint allows you to checkpoint a container using criu
func (r *Runc) Checkpoint(context context.Context, id string, opts *CheckpointOpts, actions ...CheckpointAction) error {
args := []string{"checkpoint"}
if opts != nil {
args = append(args, opts.args()...)
}
for _, a := range actions {
args = a(args)
}
return r.runOrError(r.command(context, append(args, id)...))
}
type RestoreOpts struct {
CheckpointOpts
IO
Detach bool
PidFile string
NoSubreaper bool
NoPivot bool
ConsoleSocket ConsoleSocket
}
func (o *RestoreOpts) args() ([]string, error) {
out := o.CheckpointOpts.args()
if o.Detach {
out = append(out, "--detach")
}
if o.PidFile != "" {
abs, err := filepath.Abs(o.PidFile)
if err != nil {
return nil, err
}
out = append(out, "--pid-file", abs)
}
if o.ConsoleSocket != nil {
out = append(out, "--console-socket", o.ConsoleSocket.Path())
}
if o.NoPivot {
out = append(out, "--no-pivot")
}
if o.NoSubreaper {
out = append(out, "-no-subreaper")
}
return out, nil
}
// Restore restores a container with the provide id from an existing checkpoint
func (r *Runc) Restore(context context.Context, id, bundle string, opts *RestoreOpts) (int, error) {
args := []string{"restore"}
if opts != nil {
oargs, err := opts.args()
if err != nil {
return -1, err
}
args = append(args, oargs...)
}
args = append(args, "--bundle", bundle)
cmd := r.command(context, append(args, id)...)
if opts != nil && opts.IO != nil {
opts.Set(cmd)
}
ec, err := Monitor.Start(cmd)
if err != nil {
return -1, err
}
if opts != nil && opts.IO != nil {
if c, ok := opts.IO.(StartCloser); ok {
if err := c.CloseAfterStart(); err != nil {
return -1, err
}
}
}
return Monitor.Wait(cmd, ec)
}
// Update updates the current container with the provided resource spec
func (r *Runc) Update(context context.Context, id string, resources *specs.LinuxResources) error {
buf := getBuf()
defer putBuf(buf)
if err := json.NewEncoder(buf).Encode(resources); err != nil {
return err
}
args := []string{"update", "--resources", "-", id}
cmd := r.command(context, args...)
cmd.Stdin = buf
return r.runOrError(cmd)
}
var ErrParseRuncVersion = errors.New("unable to parse runc version")
type Version struct {
Runc string
Commit string
Spec string
}
// Version returns the runc and runtime-spec versions
func (r *Runc) Version(context context.Context) (Version, error) {
data, err := cmdOutput(r.command(context, "--version"), false)
if err != nil {
return Version{}, err
}
return parseVersion(data)
}
func parseVersion(data []byte) (Version, error) {
var v Version
parts := strings.Split(strings.TrimSpace(string(data)), "\n")
if len(parts) != 3 {
return v, nil
}
for i, p := range []struct {
dest *string
split string
}{
{
dest: &v.Runc,
split: "version ",
},
{
dest: &v.Commit,
split: ": ",
},
{
dest: &v.Spec,
split: ": ",
},
} {
p2 := strings.Split(parts[i], p.split)
if len(p2) != 2 {
return v, fmt.Errorf("unable to parse version line %q", parts[i])
}
*p.dest = p2[1]
}
return v, nil
}
func (r *Runc) args() (out []string) {
if r.Root != "" {
out = append(out, "--root", r.Root)
}
if r.Debug {
out = append(out, "--debug")
}
if r.Log != "" {
out = append(out, "--log", r.Log)
}
if r.LogFormat != none {
out = append(out, "--log-format", string(r.LogFormat))
}
if r.Criu != "" {
out = append(out, "--criu", r.Criu)
}
if r.SystemdCgroup {
out = append(out, "--systemd-cgroup")
}
if r.Rootless != nil {
// nil stands for "auto" (differs from explicit "false")
out = append(out, "--rootless="+strconv.FormatBool(*r.Rootless))
}
return out
}
// runOrError will run the provided command. If an error is
// encountered and neither Stdout or Stderr was set the error and the
// stderr of the command will be returned in the format of <error>:
// <stderr>
func (r *Runc) runOrError(cmd *exec.Cmd) error {
if cmd.Stdout != nil || cmd.Stderr != nil {
ec, err := Monitor.Start(cmd)
if err != nil {
return err
}
status, err := Monitor.Wait(cmd, ec)
if err == nil && status != 0 {
err = fmt.Errorf("%s did not terminate sucessfully", cmd.Args[0])
}
return err
}
data, err := cmdOutput(cmd, true)
if err != nil {
return fmt.Errorf("%s: %s", err, data)
}
return nil
}
func cmdOutput(cmd *exec.Cmd, combined bool) ([]byte, error) {
b := getBuf()
defer putBuf(b)
cmd.Stdout = b
if combined {
cmd.Stderr = b
}
ec, err := Monitor.Start(cmd)
if err != nil {
return nil, err
}
status, err := Monitor.Wait(cmd, ec)
if err == nil && status != 0 {
err = fmt.Errorf("%s did not terminate sucessfully", cmd.Args[0])
}
return b.Bytes(), err
}