forked from hashicorp/nomad
-
Notifications
You must be signed in to change notification settings - Fork 0
/
raw_exec.go
307 lines (270 loc) · 8.74 KB
/
raw_exec.go
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
package driver
import (
"encoding/json"
"fmt"
"log"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/hashicorp/go-plugin"
"github.com/hashicorp/nomad/client/allocdir"
"github.com/hashicorp/nomad/client/config"
"github.com/hashicorp/nomad/client/driver/executor"
dstructs "github.com/hashicorp/nomad/client/driver/structs"
"github.com/hashicorp/nomad/client/fingerprint"
cstructs "github.com/hashicorp/nomad/client/structs"
"github.com/hashicorp/nomad/helper/discover"
"github.com/hashicorp/nomad/helper/fields"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/mitchellh/mapstructure"
)
const (
// The option that enables this driver in the Config.Options map.
rawExecConfigOption = "driver.raw_exec.enable"
// The key populated in Node Attributes to indicate presence of the Raw Exec
// driver
rawExecDriverAttr = "driver.raw_exec"
)
// The RawExecDriver is a privileged version of the exec driver. It provides no
// resource isolation and just fork/execs. The Exec driver should be preferred
// and this should only be used when explicitly needed.
type RawExecDriver struct {
DriverContext
fingerprint.StaticFingerprinter
}
// rawExecHandle is returned from Start/Open as a handle to the PID
type rawExecHandle struct {
version string
pluginClient *plugin.Client
userPid int
executor executor.Executor
killTimeout time.Duration
maxKillTimeout time.Duration
allocDir *allocdir.AllocDir
logger *log.Logger
waitCh chan *dstructs.WaitResult
doneCh chan struct{}
}
// NewRawExecDriver is used to create a new raw exec driver
func NewRawExecDriver(ctx *DriverContext) Driver {
return &RawExecDriver{DriverContext: *ctx}
}
// Validate is used to validate the driver configuration
func (d *RawExecDriver) Validate(config map[string]interface{}) error {
fd := &fields.FieldData{
Raw: config,
Schema: map[string]*fields.FieldSchema{
"command": &fields.FieldSchema{
Type: fields.TypeString,
Required: true,
},
"args": &fields.FieldSchema{
Type: fields.TypeArray,
},
},
}
if err := fd.Validate(); err != nil {
return err
}
return nil
}
func (d *RawExecDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
// Get the current status so that we can log any debug messages only if the
// state changes
_, currentlyEnabled := node.Attributes[rawExecDriverAttr]
// Check that the user has explicitly enabled this executor.
enabled := cfg.ReadBoolDefault(rawExecConfigOption, false)
if enabled {
if currentlyEnabled {
d.logger.Printf("[WARN] driver.raw_exec: raw exec is enabled. Only enable if needed")
}
node.Attributes[rawExecDriverAttr] = "1"
return true, nil
}
delete(node.Attributes, rawExecDriverAttr)
return false, nil
}
func (d *RawExecDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
var driverConfig ExecDriverConfig
if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
return nil, err
}
// Get the tasks local directory.
taskName := d.DriverContext.taskName
taskDir, ok := ctx.AllocDir.TaskDirs[taskName]
if !ok {
return nil, fmt.Errorf("Could not find task directory for task: %v", d.DriverContext.taskName)
}
// Get the command to be ran
command := driverConfig.Command
if err := validateCommand(command, "args"); err != nil {
return nil, err
}
// Set the host environment variables.
filter := strings.Split(d.config.ReadDefault("env.blacklist", config.DefaultEnvBlacklist), ",")
d.taskEnv.AppendHostEnvvars(filter)
bin, err := discover.NomadExecutable()
if err != nil {
return nil, fmt.Errorf("unable to find the nomad binary: %v", err)
}
pluginLogFile := filepath.Join(taskDir, fmt.Sprintf("%s-executor.out", task.Name))
pluginConfig := &plugin.ClientConfig{
Cmd: exec.Command(bin, "executor", pluginLogFile),
}
exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
if err != nil {
return nil, err
}
executorCtx := &executor.ExecutorContext{
TaskEnv: d.taskEnv,
Driver: "raw_exec",
AllocDir: ctx.AllocDir,
AllocID: ctx.AllocID,
Task: task,
}
ps, err := exec.LaunchCmd(&executor.ExecCommand{
Cmd: command,
Args: driverConfig.Args,
User: task.User,
}, executorCtx)
if err != nil {
pluginClient.Kill()
return nil, err
}
d.logger.Printf("[DEBUG] driver.raw_exec: started process with pid: %v", ps.Pid)
// Return a driver handle
maxKill := d.DriverContext.config.MaxKillTimeout
h := &rawExecHandle{
pluginClient: pluginClient,
executor: exec,
userPid: ps.Pid,
killTimeout: GetKillTimeout(task.KillTimeout, maxKill),
maxKillTimeout: maxKill,
allocDir: ctx.AllocDir,
version: d.config.Version,
logger: d.logger,
doneCh: make(chan struct{}),
waitCh: make(chan *dstructs.WaitResult, 1),
}
if err := h.executor.SyncServices(consulContext(d.config, "")); err != nil {
h.logger.Printf("[ERR] driver.raw_exec: error registering services with consul for task: %q: %v", task.Name, err)
}
go h.run()
return h, nil
}
type rawExecId struct {
Version string
KillTimeout time.Duration
MaxKillTimeout time.Duration
UserPid int
PluginConfig *PluginReattachConfig
AllocDir *allocdir.AllocDir
}
func (d *RawExecDriver) Open(ctx *ExecContext, handleID string) (DriverHandle, error) {
id := &rawExecId{}
if err := json.Unmarshal([]byte(handleID), id); err != nil {
return nil, fmt.Errorf("Failed to parse handle '%s': %v", handleID, err)
}
pluginConfig := &plugin.ClientConfig{
Reattach: id.PluginConfig.PluginConfig(),
}
exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
if err != nil {
d.logger.Println("[ERR] driver.raw_exec: error connecting to plugin so destroying plugin pid and user pid")
if e := destroyPlugin(id.PluginConfig.Pid, id.UserPid); e != nil {
d.logger.Printf("[ERR] driver.raw_exec: error destroying plugin and userpid: %v", e)
}
return nil, fmt.Errorf("error connecting to plugin: %v", err)
}
ver, _ := exec.Version()
d.logger.Printf("[DEBUG] driver.raw_exec: version of executor: %v", ver.Version)
// Return a driver handle
h := &rawExecHandle{
pluginClient: pluginClient,
executor: exec,
userPid: id.UserPid,
logger: d.logger,
killTimeout: id.KillTimeout,
maxKillTimeout: id.MaxKillTimeout,
allocDir: id.AllocDir,
version: id.Version,
doneCh: make(chan struct{}),
waitCh: make(chan *dstructs.WaitResult, 1),
}
if err := h.executor.SyncServices(consulContext(d.config, "")); err != nil {
h.logger.Printf("[ERR] driver.raw_exec: error registering services with consul: %v", err)
}
go h.run()
return h, nil
}
func (h *rawExecHandle) ID() string {
id := rawExecId{
Version: h.version,
KillTimeout: h.killTimeout,
MaxKillTimeout: h.maxKillTimeout,
PluginConfig: NewPluginReattachConfig(h.pluginClient.ReattachConfig()),
UserPid: h.userPid,
AllocDir: h.allocDir,
}
data, err := json.Marshal(id)
if err != nil {
h.logger.Printf("[ERR] driver.raw_exec: failed to marshal ID to JSON: %s", err)
}
return string(data)
}
func (h *rawExecHandle) WaitCh() chan *dstructs.WaitResult {
return h.waitCh
}
func (h *rawExecHandle) Update(task *structs.Task) error {
// Store the updated kill timeout.
h.killTimeout = GetKillTimeout(task.KillTimeout, h.maxKillTimeout)
h.executor.UpdateTask(task)
// Update is not possible
return nil
}
func (h *rawExecHandle) Kill() error {
if err := h.executor.ShutDown(); err != nil {
if h.pluginClient.Exited() {
return nil
}
return fmt.Errorf("executor Shutdown failed: %v", err)
}
select {
case <-h.doneCh:
return nil
case <-time.After(h.killTimeout):
if h.pluginClient.Exited() {
return nil
}
if err := h.executor.Exit(); err != nil {
return fmt.Errorf("executor Exit failed: %v", err)
}
return nil
}
}
func (h *rawExecHandle) Stats() (*cstructs.TaskResourceUsage, error) {
return h.executor.Stats()
}
func (h *rawExecHandle) run() {
ps, err := h.executor.Wait()
close(h.doneCh)
if ps.ExitCode == 0 && err != nil {
if e := killProcess(h.userPid); e != nil {
h.logger.Printf("[ERR] driver.raw_exec: error killing user process: %v", e)
}
if e := h.allocDir.UnmountAll(); e != nil {
h.logger.Printf("[ERR] driver.raw_exec: unmounting dev,proc and alloc dirs failed: %v", e)
}
}
h.waitCh <- &dstructs.WaitResult{ExitCode: ps.ExitCode, Signal: ps.Signal, Err: err}
close(h.waitCh)
// Remove services
if err := h.executor.DeregisterServices(); err != nil {
h.logger.Printf("[ERR] driver.raw_exec: failed to deregister services: %v", err)
}
if err := h.executor.Exit(); err != nil {
h.logger.Printf("[ERR] driver.raw_exec: error killing executor: %v", err)
}
h.pluginClient.Kill()
}