1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352
|
package plugin // import "github.com/docker/docker/plugin"
import (
"context"
"encoding/json"
"net"
"os"
"path/filepath"
"time"
"github.com/containerd/containerd/content"
"github.com/docker/docker/api/types"
"github.com/docker/docker/daemon/initlayer"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/pkg/containerfs"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/plugins"
"github.com/docker/docker/pkg/stringid"
v2 "github.com/docker/docker/plugin/v2"
"github.com/moby/sys/mount"
digest "github.com/opencontainers/go-digest"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
func (pm *Manager) enable(p *v2.Plugin, c *controller, force bool) error {
p.Rootfs = filepath.Join(pm.config.Root, p.PluginObj.ID, "rootfs")
if p.IsEnabled() && !force {
return errors.Wrap(enabledError(p.Name()), "plugin already enabled")
}
spec, err := p.InitSpec(pm.config.ExecRoot)
if err != nil {
return err
}
c.restart = true
c.exitChan = make(chan bool)
pm.mu.Lock()
pm.cMap[p] = c
pm.mu.Unlock()
var propRoot string
if p.PluginObj.Config.PropagatedMount != "" {
propRoot = filepath.Join(filepath.Dir(p.Rootfs), "propagated-mount")
if err := os.MkdirAll(propRoot, 0755); err != nil {
logrus.Errorf("failed to create PropagatedMount directory at %s: %v", propRoot, err)
}
if err := mount.MakeRShared(propRoot); err != nil {
return errors.Wrap(err, "error setting up propagated mount dir")
}
}
rootFS := containerfs.NewLocalContainerFS(filepath.Join(pm.config.Root, p.PluginObj.ID, rootFSFileName))
if err := initlayer.Setup(rootFS, idtools.Identity{UID: 0, GID: 0}); err != nil {
return errors.WithStack(err)
}
stdout, stderr := makeLoggerStreams(p.GetID())
if err := pm.executor.Create(p.GetID(), *spec, stdout, stderr); err != nil {
if p.PluginObj.Config.PropagatedMount != "" {
if err := mount.Unmount(propRoot); err != nil {
logrus.WithField("plugin", p.Name()).WithError(err).Warn("Failed to unmount vplugin propagated mount root")
}
}
return errors.WithStack(err)
}
return pm.pluginPostStart(p, c)
}
func (pm *Manager) pluginPostStart(p *v2.Plugin, c *controller) error {
sockAddr := filepath.Join(pm.config.ExecRoot, p.GetID(), p.GetSocket())
p.SetTimeout(time.Duration(c.timeoutInSecs) * time.Second)
addr := &net.UnixAddr{Net: "unix", Name: sockAddr}
p.SetAddr(addr)
if p.Protocol() == plugins.ProtocolSchemeHTTPV1 {
client, err := plugins.NewClientWithTimeout(addr.Network()+"://"+addr.String(), nil, p.Timeout())
if err != nil {
c.restart = false
shutdownPlugin(p, c.exitChan, pm.executor)
return errors.WithStack(err)
}
p.SetPClient(client)
}
// Initial sleep before net Dial to allow plugin to listen on socket.
time.Sleep(500 * time.Millisecond)
maxRetries := 3
var retries int
for {
// net dial into the unix socket to see if someone's listening.
conn, err := net.Dial("unix", sockAddr)
if err == nil {
conn.Close()
break
}
time.Sleep(3 * time.Second)
retries++
if retries > maxRetries {
logrus.Debugf("error net dialing plugin: %v", err)
c.restart = false
// While restoring plugins, we need to explicitly set the state to disabled
pm.config.Store.SetState(p, false)
shutdownPlugin(p, c.exitChan, pm.executor)
return err
}
}
pm.config.Store.SetState(p, true)
pm.config.Store.CallHandler(p)
return pm.save(p)
}
func (pm *Manager) restore(p *v2.Plugin, c *controller) error {
stdout, stderr := makeLoggerStreams(p.GetID())
alive, err := pm.executor.Restore(p.GetID(), stdout, stderr)
if err != nil {
return err
}
if pm.config.LiveRestoreEnabled {
if !alive {
return pm.enable(p, c, true)
}
c.exitChan = make(chan bool)
c.restart = true
pm.mu.Lock()
pm.cMap[p] = c
pm.mu.Unlock()
return pm.pluginPostStart(p, c)
}
if alive {
// TODO(@cpuguy83): Should we always just re-attach to the running plugin instead of doing this?
c.restart = false
shutdownPlugin(p, c.exitChan, pm.executor)
}
return nil
}
const shutdownTimeout = 10 * time.Second
func shutdownPlugin(p *v2.Plugin, ec chan bool, executor Executor) {
pluginID := p.GetID()
err := executor.Signal(pluginID, int(unix.SIGTERM))
if err != nil {
logrus.Errorf("Sending SIGTERM to plugin failed with error: %v", err)
} else {
timeout := time.NewTimer(shutdownTimeout)
defer timeout.Stop()
select {
case <-ec:
logrus.Debug("Clean shutdown of plugin")
case <-timeout.C:
logrus.Debug("Force shutdown plugin")
if err := executor.Signal(pluginID, int(unix.SIGKILL)); err != nil {
logrus.Errorf("Sending SIGKILL to plugin failed with error: %v", err)
}
timeout.Reset(shutdownTimeout)
select {
case <-ec:
logrus.Debug("SIGKILL plugin shutdown")
case <-timeout.C:
logrus.WithField("plugin", p.Name).Warn("Force shutdown plugin FAILED")
}
}
}
}
func (pm *Manager) disable(p *v2.Plugin, c *controller) error {
if !p.IsEnabled() {
return errors.Wrap(errDisabled(p.Name()), "plugin is already disabled")
}
c.restart = false
shutdownPlugin(p, c.exitChan, pm.executor)
pm.config.Store.SetState(p, false)
return pm.save(p)
}
// Shutdown stops all plugins and called during daemon shutdown.
func (pm *Manager) Shutdown() {
plugins := pm.config.Store.GetAll()
for _, p := range plugins {
pm.mu.RLock()
c := pm.cMap[p]
pm.mu.RUnlock()
if pm.config.LiveRestoreEnabled && p.IsEnabled() {
logrus.Debug("Plugin active when liveRestore is set, skipping shutdown")
continue
}
if pm.executor != nil && p.IsEnabled() {
c.restart = false
shutdownPlugin(p, c.exitChan, pm.executor)
}
}
if err := mount.RecursiveUnmount(pm.config.Root); err != nil {
logrus.WithError(err).Warn("error cleaning up plugin mounts")
}
}
func (pm *Manager) upgradePlugin(p *v2.Plugin, configDigest, manifestDigest digest.Digest, blobsums []digest.Digest, tmpRootFSDir string, privileges *types.PluginPrivileges) (err error) {
config, err := pm.setupNewPlugin(configDigest, blobsums, privileges)
if err != nil {
return err
}
pdir := filepath.Join(pm.config.Root, p.PluginObj.ID)
orig := filepath.Join(pdir, "rootfs")
// Make sure nothing is mounted
// This could happen if the plugin was disabled with `-f` with active mounts.
// If there is anything in `orig` is still mounted, this should error out.
if err := mount.RecursiveUnmount(orig); err != nil {
return errdefs.System(err)
}
backup := orig + "-old"
if err := os.Rename(orig, backup); err != nil {
return errors.Wrap(errdefs.System(err), "error backing up plugin data before upgrade")
}
defer func() {
if err != nil {
if rmErr := os.RemoveAll(orig); rmErr != nil {
logrus.WithError(rmErr).WithField("dir", backup).Error("error cleaning up after failed upgrade")
return
}
if mvErr := os.Rename(backup, orig); mvErr != nil {
err = errors.Wrap(mvErr, "error restoring old plugin root on upgrade failure")
}
if rmErr := os.RemoveAll(tmpRootFSDir); rmErr != nil && !os.IsNotExist(rmErr) {
logrus.WithError(rmErr).WithField("plugin", p.Name()).Errorf("error cleaning up plugin upgrade dir: %s", tmpRootFSDir)
}
} else {
if rmErr := os.RemoveAll(backup); rmErr != nil {
logrus.WithError(rmErr).WithField("dir", backup).Error("error cleaning up old plugin root after successful upgrade")
}
p.Config = configDigest
p.Blobsums = blobsums
}
}()
if err := os.Rename(tmpRootFSDir, orig); err != nil {
return errors.Wrap(errdefs.System(err), "error upgrading")
}
p.PluginObj.Config = config
p.Manifest = manifestDigest
err = pm.save(p)
return errors.Wrap(err, "error saving upgraded plugin config")
}
func (pm *Manager) setupNewPlugin(configDigest digest.Digest, blobsums []digest.Digest, privileges *types.PluginPrivileges) (types.PluginConfig, error) {
configRA, err := pm.blobStore.ReaderAt(context.TODO(), specs.Descriptor{Digest: configDigest})
if err != nil {
return types.PluginConfig{}, err
}
defer configRA.Close()
configR := content.NewReader(configRA)
var config types.PluginConfig
dec := json.NewDecoder(configR)
if err := dec.Decode(&config); err != nil {
return types.PluginConfig{}, errors.Wrapf(err, "failed to parse config")
}
if dec.More() {
return types.PluginConfig{}, errors.New("invalid config json")
}
requiredPrivileges := computePrivileges(config)
if privileges != nil {
if err := validatePrivileges(requiredPrivileges, *privileges); err != nil {
return types.PluginConfig{}, err
}
}
return config, nil
}
// createPlugin creates a new plugin. take lock before calling.
func (pm *Manager) createPlugin(name string, configDigest, manifestDigest digest.Digest, blobsums []digest.Digest, rootFSDir string, privileges *types.PluginPrivileges, opts ...CreateOpt) (p *v2.Plugin, err error) {
if err := pm.config.Store.validateName(name); err != nil { // todo: this check is wrong. remove store
return nil, errdefs.InvalidParameter(err)
}
config, err := pm.setupNewPlugin(configDigest, blobsums, privileges)
if err != nil {
return nil, err
}
p = &v2.Plugin{
PluginObj: types.Plugin{
Name: name,
ID: stringid.GenerateRandomID(),
Config: config,
},
Config: configDigest,
Blobsums: blobsums,
Manifest: manifestDigest,
}
p.InitEmptySettings()
for _, o := range opts {
o(p)
}
pdir := filepath.Join(pm.config.Root, p.PluginObj.ID)
if err := os.MkdirAll(pdir, 0700); err != nil {
return nil, errors.Wrapf(err, "failed to mkdir %v", pdir)
}
defer func() {
if err != nil {
os.RemoveAll(pdir)
}
}()
if err := os.Rename(rootFSDir, filepath.Join(pdir, rootFSFileName)); err != nil {
return nil, errors.Wrap(err, "failed to rename rootfs")
}
if err := pm.save(p); err != nil {
return nil, err
}
pm.config.Store.Add(p) // todo: remove
return p, nil
}
func recursiveUnmount(target string) error {
return mount.RecursiveUnmount(target)
}
|