forked from hashicorp/nomad
/
raw_exec.go
354 lines (308 loc) · 9.97 KB
/
raw_exec.go
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package driver
import (
"context"
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"runtime"
"syscall"
"time"
multierror "github.com/hashicorp/go-multierror"
"github.com/hashicorp/go-plugin"
"github.com/hashicorp/nomad/client/allocdir"
"github.com/hashicorp/nomad/client/driver/env"
"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/fields"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/mitchellh/mapstructure"
)
const (
// rawExecEnableOption is the option that enables this driver in the Config.Options map.
rawExecEnableOption = "driver.raw_exec.enable"
// rawExecNoCgroupOption forces no cgroups.
rawExecNoCgroupOption = "driver.raw_exec.no_cgroups"
// 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
// useCgroup tracks whether we should use a cgroup to manage the process
// tree
useCgroup bool
}
// 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
isolationConfig *dstructs.IsolationConfig
killTimeout time.Duration
maxKillTimeout time.Duration
logger *log.Logger
waitCh chan *dstructs.WaitResult
doneCh chan struct{}
taskEnv *env.TaskEnv
taskDir *allocdir.TaskDir
}
// 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": {
Type: fields.TypeString,
Required: true,
},
"args": {
Type: fields.TypeArray,
},
},
}
if err := fd.Validate(); err != nil {
return err
}
return nil
}
func (d *RawExecDriver) Abilities() DriverAbilities {
return DriverAbilities{
SendSignals: true,
Exec: true,
}
}
func (d *RawExecDriver) FSIsolation() cstructs.FSIsolation {
return cstructs.FSIsolationNone
}
func (d *RawExecDriver) Fingerprint(req *cstructs.FingerprintRequest, resp *cstructs.FingerprintResponse) error {
// Check that the user has explicitly enabled this executor.
enabled := req.Config.ReadBoolDefault(rawExecEnableOption, false)
if enabled || req.Config.DevMode {
d.logger.Printf("[WARN] driver.raw_exec: raw exec is enabled. Only enable if needed")
resp.AddAttribute(rawExecDriverAttr, "1")
resp.Detected = true
return nil
}
resp.RemoveAttribute(rawExecDriverAttr)
return nil
}
func (d *RawExecDriver) Prestart(*ExecContext, *structs.Task) (*PrestartResponse, error) {
// If we are on linux, running as root, cgroups are mounted, and cgroups
// aren't disabled by the operator use cgroups for pid management.
forceDisable := d.DriverContext.config.ReadBoolDefault(rawExecNoCgroupOption, false)
if !forceDisable && runtime.GOOS == "linux" &&
syscall.Geteuid() == 0 && cgroupsMounted(d.DriverContext.node) {
d.useCgroup = true
}
return nil, nil
}
func (d *RawExecDriver) Start(ctx *ExecContext, task *structs.Task) (*StartResponse, error) {
var driverConfig ExecDriverConfig
if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
return nil, err
}
// Get the command to be ran
command := driverConfig.Command
if err := validateCommand(command, "args"); err != nil {
return nil, err
}
pluginLogFile := filepath.Join(ctx.TaskDir.Dir, "executor.out")
executorConfig := &dstructs.ExecutorConfig{
LogFile: pluginLogFile,
LogLevel: d.config.LogLevel,
}
exec, pluginClient, err := createExecutor(d.config.LogOutput, d.config, executorConfig)
if err != nil {
return nil, err
}
executorCtx := &executor.ExecutorContext{
TaskEnv: ctx.TaskEnv,
Driver: "raw_exec",
Task: task,
TaskDir: ctx.TaskDir.Dir,
LogDir: ctx.TaskDir.LogDir,
}
if err := exec.SetContext(executorCtx); err != nil {
pluginClient.Kill()
return nil, fmt.Errorf("failed to set executor context: %v", err)
}
taskKillSignal, err := getTaskKillSignal(task.KillSignal)
if err != nil {
return nil, err
}
execCmd := &executor.ExecCommand{
Cmd: command,
Args: driverConfig.Args,
User: task.User,
TaskKillSignal: taskKillSignal,
BasicProcessCgroup: d.useCgroup,
}
ps, err := exec.LaunchCmd(execCmd)
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,
isolationConfig: ps.IsolationConfig,
userPid: ps.Pid,
killTimeout: GetKillTimeout(task.KillTimeout, maxKill),
maxKillTimeout: maxKill,
version: d.config.Version.VersionNumber(),
logger: d.logger,
doneCh: make(chan struct{}),
waitCh: make(chan *dstructs.WaitResult, 1),
taskEnv: ctx.TaskEnv,
taskDir: ctx.TaskDir,
}
go h.run()
return &StartResponse{Handle: h}, nil
}
func (d *RawExecDriver) Cleanup(*ExecContext, *CreatedResources) error { return nil }
type rawExecId struct {
Version string
KillTimeout time.Duration
MaxKillTimeout time.Duration
UserPid int
PluginConfig *PluginReattachConfig
IsolationConfig *dstructs.IsolationConfig
}
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 := createExecutorWithConfig(pluginConfig, d.config.LogOutput)
if err != nil {
merrs := new(multierror.Error)
merrs.Errors = append(merrs.Errors, err)
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 {
merrs.Errors = append(merrs.Errors, fmt.Errorf("error destroying plugin and userpid: %v", e))
}
if id.IsolationConfig != nil {
ePid := pluginConfig.Reattach.Pid
if e := executor.ClientCleanup(id.IsolationConfig, ePid); e != nil {
merrs.Errors = append(merrs.Errors, fmt.Errorf("destroying resource container failed: %v", e))
}
}
return nil, fmt.Errorf("error connecting to plugin: %v", merrs.ErrorOrNil())
}
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,
isolationConfig: id.IsolationConfig,
logger: d.logger,
killTimeout: id.KillTimeout,
maxKillTimeout: id.MaxKillTimeout,
version: id.Version,
doneCh: make(chan struct{}),
waitCh: make(chan *dstructs.WaitResult, 1),
taskEnv: ctx.TaskEnv,
taskDir: ctx.TaskDir,
}
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,
IsolationConfig: h.isolationConfig,
}
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) Exec(ctx context.Context, cmd string, args []string) ([]byte, int, error) {
return executor.ExecScript(ctx, h.taskDir.Dir, h.taskEnv, nil, cmd, args)
}
func (h *rawExecHandle) Signal(s os.Signal) error {
return h.executor.Signal(s)
}
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, werr := h.executor.Wait()
close(h.doneCh)
if ps.ExitCode == 0 && werr != nil {
if h.isolationConfig != nil {
ePid := h.pluginClient.ReattachConfig().Pid
if e := executor.ClientCleanup(h.isolationConfig, ePid); e != nil {
h.logger.Printf("[ERR] driver.raw_exec: destroying resource container failed: %v", e)
}
} else {
if e := killProcess(h.userPid); e != nil {
h.logger.Printf("[ERR] driver.raw_exec: error killing user process: %v", e)
}
}
}
// Exit the executor
if err := h.executor.Exit(); err != nil {
h.logger.Printf("[ERR] driver.raw_exec: error killing executor: %v", err)
}
h.pluginClient.Kill()
// Send the results
h.waitCh <- &dstructs.WaitResult{ExitCode: ps.ExitCode, Signal: ps.Signal, Err: werr}
close(h.waitCh)
}