forked from canonical/lxd
/
containers.go
248 lines (197 loc) · 5.2 KB
/
containers.go
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package main
import (
"fmt"
"os"
"sort"
"strconv"
"sync"
"syscall"
"time"
"gopkg.in/lxc/go-lxc.v2"
"github.com/lxc/lxd/shared"
log "gopkg.in/inconshreveable/log15.v2"
)
var containersCmd = Command{
name: "containers",
get: containersGet,
post: containersPost,
}
var containerCmd = Command{
name: "containers/{name}",
get: containerGet,
put: containerPut,
delete: containerDelete,
post: containerPost,
}
var containerStateCmd = Command{
name: "containers/{name}/state",
get: containerState,
put: containerStatePut,
}
var containerFileCmd = Command{
name: "containers/{name}/files",
get: containerFileHandler,
post: containerFileHandler,
}
var containerSnapshotsCmd = Command{
name: "containers/{name}/snapshots",
get: containerSnapshotsGet,
post: containerSnapshotsPost,
}
var containerSnapshotCmd = Command{
name: "containers/{name}/snapshots/{snapshotName}",
get: snapshotHandler,
post: snapshotHandler,
delete: snapshotHandler,
}
var containerExecCmd = Command{
name: "containers/{name}/exec",
post: containerExecPost,
}
type containerAutostartList []container
func (slice containerAutostartList) Len() int {
return len(slice)
}
func (slice containerAutostartList) Less(i, j int) bool {
iOrder := slice[i].ExpandedConfig()["boot.autostart.priority"]
jOrder := slice[j].ExpandedConfig()["boot.autostart.priority"]
if iOrder != jOrder {
iOrderInt, _ := strconv.Atoi(iOrder)
jOrderInt, _ := strconv.Atoi(jOrder)
return iOrderInt > jOrderInt
}
return slice[i].Name() < slice[j].Name()
}
func (slice containerAutostartList) Swap(i, j int) {
slice[i], slice[j] = slice[j], slice[i]
}
func containersRestart(d *Daemon) error {
result, err := dbContainersList(d.db, cTypeRegular)
if err != nil {
return err
}
containers := []container{}
for _, name := range result {
c, err := containerLoadByName(d, name)
if err != nil {
return err
}
containers = append(containers, c)
}
sort.Sort(containerAutostartList(containers))
for _, c := range containers {
config := c.ExpandedConfig()
lastState := config["volatile.last_state.power"]
autoStart := config["boot.autostart"]
autoStartDelay := config["boot.autostart.delay"]
if lastState == "RUNNING" || autoStart == "true" {
if c.IsRunning() {
continue
}
c.Start(false)
autoStartDelayInt, err := strconv.Atoi(autoStartDelay)
if err == nil {
time.Sleep(time.Duration(autoStartDelayInt) * time.Second)
}
}
}
_, err = dbExec(d.db, "DELETE FROM containers_config WHERE key='volatile.last_state.power'")
if err != nil {
return err
}
return nil
}
func containersShutdown(d *Daemon) error {
results, err := dbContainersList(d.db, cTypeRegular)
if err != nil {
return err
}
var wg sync.WaitGroup
for _, r := range results {
c, err := containerLoadByName(d, r)
if err != nil {
return err
}
err = c.ConfigKeySet("volatile.last_state.power", c.State())
if err != nil {
return err
}
if c.IsRunning() {
wg.Add(1)
go func() {
c.Shutdown(time.Second * 30)
c.Stop(false)
wg.Done()
}()
}
wg.Wait()
}
return nil
}
func containerDeleteSnapshots(d *Daemon, cname string) error {
shared.Log.Debug("containerDeleteSnapshots",
log.Ctx{"container": cname})
results, err := dbContainerGetSnapshots(d.db, cname)
if err != nil {
return err
}
for _, sname := range results {
sc, err := containerLoadByName(d, sname)
if err != nil {
shared.Log.Error(
"containerDeleteSnapshots: Failed to load the snapshotcontainer",
log.Ctx{"container": cname, "snapshot": sname})
continue
}
if err := sc.Delete(); err != nil {
shared.Log.Error(
"containerDeleteSnapshots: Failed to delete a snapshotcontainer",
log.Ctx{"container": cname, "snapshot": sname, "err": err})
}
}
return nil
}
/*
* This is called by lxd when called as "lxd forkstart <container>"
* 'forkstart' is used instead of just 'start' in the hopes that people
* do not accidentally type 'lxd start' instead of 'lxc start'
*
* We expect to read the lxcconfig over fd 3.
*/
func startContainer(args []string) error {
if len(args) != 4 {
return fmt.Errorf("Bad arguments: %q", args)
}
name := args[1]
lxcpath := args[2]
configPath := args[3]
c, err := lxc.NewContainer(name, lxcpath)
if err != nil {
return fmt.Errorf("Error initializing container for start: %q", err)
}
err = c.LoadConfigFile(configPath)
if err != nil {
return fmt.Errorf("Error opening startup config file: %q", err)
}
/* due to https://github.com/golang/go/issues/13155 and the
* CollectOutput call we make for the forkstart process, we need to
* close our stdin/stdout/stderr here. Collecting some of the logs is
* better than collecting no logs, though.
*/
os.Stdin.Close()
os.Stderr.Close()
os.Stdout.Close()
// Redirect stdout and stderr to a log file
logPath := shared.LogPath(name, "forkstart.log")
if shared.PathExists(logPath) {
os.Remove(logPath)
}
logFile, err := os.OpenFile(logPath, os.O_WRONLY|os.O_CREATE|os.O_SYNC, 0644)
if err == nil {
syscall.Dup3(int(logFile.Fd()), 1, 0)
syscall.Dup3(int(logFile.Fd()), 2, 0)
}
// Move the config so we can inspect it on failure
shared.FileMove(configPath, shared.LogPath(name, "lxc.conf"))
return c.Start()
}