660 lines
20 KiB
Go
660 lines
20 KiB
Go
package qemu
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"os/exec"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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"time"
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"github.com/coreos/go-semver/semver"
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hclog "github.com/hashicorp/go-hclog"
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"github.com/hashicorp/nomad/client/taskenv"
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"github.com/hashicorp/nomad/drivers/shared/eventer"
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"github.com/hashicorp/nomad/drivers/shared/executor"
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"github.com/hashicorp/nomad/helper/pluginutils/hclutils"
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"github.com/hashicorp/nomad/helper/pluginutils/loader"
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"github.com/hashicorp/nomad/plugins/base"
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"github.com/hashicorp/nomad/plugins/drivers"
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"github.com/hashicorp/nomad/plugins/shared/hclspec"
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pstructs "github.com/hashicorp/nomad/plugins/shared/structs"
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)
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const (
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// pluginName is the name of the plugin
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pluginName = "qemu"
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// fingerprintPeriod is the interval at which the driver will send fingerprint responses
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fingerprintPeriod = 30 * time.Second
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// The key populated in Node Attributes to indicate presence of the Qemu driver
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driverAttr = "driver.qemu"
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driverVersionAttr = "driver.qemu.version"
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// Represents an ACPI shutdown request to the VM (emulates pressing a physical power button)
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// Reference: https://en.wikibooks.org/wiki/QEMU/Monitor
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qemuGracefulShutdownMsg = "system_powerdown\n"
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qemuMonitorSocketName = "qemu-monitor.sock"
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// Maximum socket path length prior to qemu 2.10.1
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qemuLegacyMaxMonitorPathLen = 108
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// taskHandleVersion is the version of task handle which this driver sets
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// and understands how to decode driver state
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taskHandleVersion = 1
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)
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var (
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// PluginID is the qemu plugin metadata registered in the plugin
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// catalog.
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PluginID = loader.PluginID{
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Name: pluginName,
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PluginType: base.PluginTypeDriver,
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}
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// PluginConfig is the qemu driver factory function registered in the
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// plugin catalog.
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PluginConfig = &loader.InternalPluginConfig{
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Config: map[string]interface{}{},
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Factory: func(l hclog.Logger) interface{} { return NewQemuDriver(l) },
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}
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versionRegex = regexp.MustCompile(`version (\d[\.\d+]+)`)
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// Prior to qemu 2.10.1, monitor socket paths are truncated to 108 bytes.
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// We should consider this if driver.qemu.version is < 2.10.1 and the
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// generated monitor path is too long.
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//
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// Relevant fix is here:
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// https://github.com/qemu/qemu/commit/ad9579aaa16d5b385922d49edac2c96c79bcfb6
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qemuVersionLongSocketPathFix = semver.New("2.10.1")
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// pluginInfo is the response returned for the PluginInfo RPC
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pluginInfo = &base.PluginInfoResponse{
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Type: base.PluginTypeDriver,
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PluginApiVersions: []string{drivers.ApiVersion010},
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PluginVersion: "0.1.0",
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Name: pluginName,
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}
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// configSpec is the hcl specification returned by the ConfigSchema RPC
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configSpec = hclspec.NewObject(map[string]*hclspec.Spec{})
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// taskConfigSpec is the hcl specification for the driver config section of
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// a taskConfig within a job. It is returned in the TaskConfigSchema RPC
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taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
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"image_path": hclspec.NewAttr("image_path", "string", true),
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"accelerator": hclspec.NewAttr("accelerator", "string", false),
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"graceful_shutdown": hclspec.NewAttr("graceful_shutdown", "bool", false),
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"args": hclspec.NewAttr("args", "list(string)", false),
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"port_map": hclspec.NewAttr("port_map", "list(map(number))", false),
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})
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// capabilities is returned by the Capabilities RPC and indicates what
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// optional features this driver supports
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capabilities = &drivers.Capabilities{
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SendSignals: false,
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Exec: false,
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FSIsolation: drivers.FSIsolationImage,
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}
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_ drivers.DriverPlugin = (*Driver)(nil)
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)
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// TaskConfig is the driver configuration of a taskConfig within a job
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type TaskConfig struct {
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ImagePath string `codec:"image_path"`
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Accelerator string `codec:"accelerator"`
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Args []string `codec:"args"` // extra arguments to qemu executable
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PortMap hclutils.MapStrInt `codec:"port_map"` // A map of host port and the port name defined in the image manifest file
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GracefulShutdown bool `codec:"graceful_shutdown"`
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}
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// TaskState is the state which is encoded in the handle returned in StartTask.
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// This information is needed to rebuild the taskConfig state and handler
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// during recovery.
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type TaskState struct {
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ReattachConfig *pstructs.ReattachConfig
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TaskConfig *drivers.TaskConfig
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Pid int
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StartedAt time.Time
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}
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// Driver is a driver for running images via Qemu
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type Driver struct {
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// eventer is used to handle multiplexing of TaskEvents calls such that an
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// event can be broadcast to all callers
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eventer *eventer.Eventer
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// tasks is the in memory datastore mapping taskIDs to qemuTaskHandle
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tasks *taskStore
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// ctx is the context for the driver. It is passed to other subsystems to
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// coordinate shutdown
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ctx context.Context
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// nomadConf is the client agent's configuration
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nomadConfig *base.ClientDriverConfig
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// signalShutdown is called when the driver is shutting down and cancels the
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// ctx passed to any subsystems
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signalShutdown context.CancelFunc
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// logger will log to the Nomad agent
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logger hclog.Logger
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}
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func NewQemuDriver(logger hclog.Logger) drivers.DriverPlugin {
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ctx, cancel := context.WithCancel(context.Background())
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logger = logger.Named(pluginName)
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return &Driver{
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eventer: eventer.NewEventer(ctx, logger),
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tasks: newTaskStore(),
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ctx: ctx,
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signalShutdown: cancel,
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logger: logger,
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}
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}
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func (d *Driver) PluginInfo() (*base.PluginInfoResponse, error) {
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return pluginInfo, nil
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}
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func (d *Driver) ConfigSchema() (*hclspec.Spec, error) {
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return configSpec, nil
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}
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func (d *Driver) SetConfig(cfg *base.Config) error {
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if cfg.AgentConfig != nil {
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d.nomadConfig = cfg.AgentConfig.Driver
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}
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return nil
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}
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func (d *Driver) TaskConfigSchema() (*hclspec.Spec, error) {
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return taskConfigSpec, nil
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}
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func (d *Driver) Capabilities() (*drivers.Capabilities, error) {
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return capabilities, nil
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}
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func (d *Driver) Fingerprint(ctx context.Context) (<-chan *drivers.Fingerprint, error) {
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ch := make(chan *drivers.Fingerprint)
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go d.handleFingerprint(ctx, ch)
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return ch, nil
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}
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func (d *Driver) handleFingerprint(ctx context.Context, ch chan *drivers.Fingerprint) {
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ticker := time.NewTimer(0)
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for {
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select {
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case <-ctx.Done():
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return
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case <-d.ctx.Done():
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return
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case <-ticker.C:
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ticker.Reset(fingerprintPeriod)
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ch <- d.buildFingerprint()
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}
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}
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}
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func (d *Driver) buildFingerprint() *drivers.Fingerprint {
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fingerprint := &drivers.Fingerprint{
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Attributes: map[string]*pstructs.Attribute{},
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Health: drivers.HealthStateHealthy,
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HealthDescription: drivers.DriverHealthy,
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}
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bin := "qemu-system-x86_64"
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if runtime.GOOS == "windows" {
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// On windows, the "qemu-system-x86_64" command does not respond to the
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// version flag.
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bin = "qemu-img"
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}
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outBytes, err := exec.Command(bin, "--version").Output()
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if err != nil {
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// return no error, as it isn't an error to not find qemu, it just means we
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// can't use it.
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fingerprint.Health = drivers.HealthStateUndetected
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fingerprint.HealthDescription = ""
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return fingerprint
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}
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out := strings.TrimSpace(string(outBytes))
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matches := versionRegex.FindStringSubmatch(out)
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if len(matches) != 2 {
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fingerprint.Health = drivers.HealthStateUndetected
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fingerprint.HealthDescription = fmt.Sprintf("Failed to parse qemu version from %v", out)
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return fingerprint
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}
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currentQemuVersion := matches[1]
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fingerprint.Attributes[driverAttr] = pstructs.NewBoolAttribute(true)
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fingerprint.Attributes[driverVersionAttr] = pstructs.NewStringAttribute(currentQemuVersion)
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return fingerprint
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}
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func (d *Driver) RecoverTask(handle *drivers.TaskHandle) error {
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if handle == nil {
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return fmt.Errorf("error: handle cannot be nil")
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}
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// COMPAT(0.10): pre 0.9 upgrade path check
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if handle.Version == 0 {
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return d.recoverPre09Task(handle)
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}
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// If already attached to handle there's nothing to recover.
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if _, ok := d.tasks.Get(handle.Config.ID); ok {
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d.logger.Trace("nothing to recover; task already exists",
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"task_id", handle.Config.ID,
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"task_name", handle.Config.Name,
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)
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return nil
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}
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var taskState TaskState
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if err := handle.GetDriverState(&taskState); err != nil {
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d.logger.Error("failed to decode taskConfig state from handle", "error", err, "task_id", handle.Config.ID)
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return fmt.Errorf("failed to decode taskConfig state from handle: %v", err)
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}
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plugRC, err := pstructs.ReattachConfigToGoPlugin(taskState.ReattachConfig)
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if err != nil {
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d.logger.Error("failed to build ReattachConfig from taskConfig state", "error", err, "task_id", handle.Config.ID)
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return fmt.Errorf("failed to build ReattachConfig from taskConfig state: %v", err)
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}
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execImpl, pluginClient, err := executor.ReattachToExecutor(plugRC,
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d.logger.With("task_name", handle.Config.Name, "alloc_id", handle.Config.AllocID))
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if err != nil {
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d.logger.Error("failed to reattach to executor", "error", err, "task_id", handle.Config.ID)
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return fmt.Errorf("failed to reattach to executor: %v", err)
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}
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h := &taskHandle{
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exec: execImpl,
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pid: taskState.Pid,
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pluginClient: pluginClient,
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taskConfig: taskState.TaskConfig,
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procState: drivers.TaskStateRunning,
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startedAt: taskState.StartedAt,
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exitResult: &drivers.ExitResult{},
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}
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d.tasks.Set(taskState.TaskConfig.ID, h)
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go h.run()
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return nil
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}
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func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
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if _, ok := d.tasks.Get(cfg.ID); ok {
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return nil, nil, fmt.Errorf("taskConfig with ID '%s' already started", cfg.ID)
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}
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var driverConfig TaskConfig
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if err := cfg.DecodeDriverConfig(&driverConfig); err != nil {
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return nil, nil, fmt.Errorf("failed to decode driver config: %v", err)
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}
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// ensure that PortMap variables are populated early on
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cfg.Env = taskenv.SetPortMapEnvs(cfg.Env, driverConfig.PortMap)
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handle := drivers.NewTaskHandle(taskHandleVersion)
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handle.Config = cfg
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// Get the image source
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vmPath := driverConfig.ImagePath
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if vmPath == "" {
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return nil, nil, fmt.Errorf("image_path must be set")
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}
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vmID := filepath.Base(vmPath)
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// Parse configuration arguments
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// Create the base arguments
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accelerator := "tcg"
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if driverConfig.Accelerator != "" {
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accelerator = driverConfig.Accelerator
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}
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mb := cfg.Resources.NomadResources.Memory.MemoryMB
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if mb < 128 || mb > 4000000 {
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return nil, nil, fmt.Errorf("Qemu memory assignment out of bounds")
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}
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mem := fmt.Sprintf("%dM", mb)
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absPath, err := GetAbsolutePath("qemu-system-x86_64")
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if err != nil {
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return nil, nil, err
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}
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args := []string{
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absPath,
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"-machine", "type=pc,accel=" + accelerator,
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"-name", vmID,
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"-m", mem,
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"-drive", "file=" + vmPath,
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"-nographic",
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}
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var monitorPath string
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if driverConfig.GracefulShutdown {
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if runtime.GOOS == "windows" {
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return nil, nil, errors.New("QEMU graceful shutdown is unsupported on the Windows platform")
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}
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// This socket will be used to manage the virtual machine (for example,
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// to perform graceful shutdowns)
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taskDir := filepath.Join(cfg.AllocDir, cfg.Name)
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fingerPrint := d.buildFingerprint()
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if fingerPrint.Attributes == nil {
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return nil, nil, fmt.Errorf("unable to get qemu driver version from fingerprinted attributes")
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}
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monitorPath, err = d.getMonitorPath(taskDir, fingerPrint)
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if err != nil {
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d.logger.Debug("could not get qemu monitor path", "error", err)
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return nil, nil, err
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}
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d.logger.Debug("got monitor path", "monitorPath", monitorPath)
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args = append(args, "-monitor", fmt.Sprintf("unix:%s,server,nowait", monitorPath))
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}
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// Add pass through arguments to qemu executable. A user can specify
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// these arguments in driver task configuration. These arguments are
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// passed directly to the qemu driver as command line options.
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// For example, args = [ "-nodefconfig", "-nodefaults" ]
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// This will allow a VM with embedded configuration to boot successfully.
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args = append(args, driverConfig.Args...)
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// Check the Resources required Networks to add port mappings. If no resources
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// are required, we assume the VM is a purely compute job and does not require
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// the outside world to be able to reach it. VMs ran without port mappings can
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// still reach out to the world, but without port mappings it is effectively
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// firewalled
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protocols := []string{"udp", "tcp"}
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if len(cfg.Resources.NomadResources.Networks) > 0 {
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// Loop through the port map and construct the hostfwd string, to map
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// reserved ports to the ports listenting in the VM
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// Ex: hostfwd=tcp::22000-:22,hostfwd=tcp::80-:8080
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var forwarding []string
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taskPorts := cfg.Resources.NomadResources.Networks[0].PortLabels()
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for label, guest := range driverConfig.PortMap {
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host, ok := taskPorts[label]
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if !ok {
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return nil, nil, fmt.Errorf("Unknown port label %q", label)
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}
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for _, p := range protocols {
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forwarding = append(forwarding, fmt.Sprintf("hostfwd=%s::%d-:%d", p, host, guest))
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}
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}
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if len(forwarding) != 0 {
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args = append(args,
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"-netdev",
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fmt.Sprintf("user,id=user.0,%s", strings.Join(forwarding, ",")),
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"-device", "virtio-net,netdev=user.0",
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)
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}
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}
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// If using KVM, add optimization args
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if accelerator == "kvm" {
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if runtime.GOOS == "windows" {
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return nil, nil, errors.New("KVM accelerator is unsupported on the Windows platform")
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}
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args = append(args,
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"-enable-kvm",
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"-cpu", "host",
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// Do we have cores information available to the Driver?
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// "-smp", fmt.Sprintf("%d", cores),
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)
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}
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d.logger.Debug("starting QemuVM command ", "args", strings.Join(args, " "))
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pluginLogFile := filepath.Join(cfg.TaskDir().Dir, fmt.Sprintf("%s-executor.out", cfg.Name))
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executorConfig := &executor.ExecutorConfig{
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LogFile: pluginLogFile,
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LogLevel: "debug",
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}
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execImpl, pluginClient, err := executor.CreateExecutor(
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d.logger.With("task_name", handle.Config.Name, "alloc_id", handle.Config.AllocID),
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d.nomadConfig, executorConfig)
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if err != nil {
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return nil, nil, err
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}
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execCmd := &executor.ExecCommand{
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Cmd: args[0],
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Args: args[1:],
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Env: cfg.EnvList(),
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User: cfg.User,
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TaskDir: cfg.TaskDir().Dir,
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StdoutPath: cfg.StdoutPath,
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StderrPath: cfg.StderrPath,
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}
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ps, err := execImpl.Launch(execCmd)
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if err != nil {
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pluginClient.Kill()
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return nil, nil, err
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}
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d.logger.Debug("started new QemuVM", "ID", vmID)
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h := &taskHandle{
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exec: execImpl,
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pid: ps.Pid,
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monitorPath: monitorPath,
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pluginClient: pluginClient,
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taskConfig: cfg,
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procState: drivers.TaskStateRunning,
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startedAt: time.Now().Round(time.Millisecond),
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logger: d.logger,
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}
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qemuDriverState := TaskState{
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ReattachConfig: pstructs.ReattachConfigFromGoPlugin(pluginClient.ReattachConfig()),
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Pid: ps.Pid,
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TaskConfig: cfg,
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StartedAt: h.startedAt,
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}
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if err := handle.SetDriverState(&qemuDriverState); err != nil {
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d.logger.Error("failed to start task, error setting driver state", "error", err)
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execImpl.Shutdown("", 0)
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pluginClient.Kill()
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return nil, nil, fmt.Errorf("failed to set driver state: %v", err)
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}
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d.tasks.Set(cfg.ID, h)
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go h.run()
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var driverNetwork *drivers.DriverNetwork
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if len(driverConfig.PortMap) == 1 {
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driverNetwork = &drivers.DriverNetwork{
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PortMap: driverConfig.PortMap,
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}
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}
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return handle, driverNetwork, nil
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}
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func (d *Driver) WaitTask(ctx context.Context, taskID string) (<-chan *drivers.ExitResult, error) {
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handle, ok := d.tasks.Get(taskID)
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if !ok {
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return nil, drivers.ErrTaskNotFound
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}
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ch := make(chan *drivers.ExitResult)
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go d.handleWait(ctx, handle, ch)
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return ch, nil
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}
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func (d *Driver) StopTask(taskID string, timeout time.Duration, signal string) error {
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handle, ok := d.tasks.Get(taskID)
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if !ok {
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return drivers.ErrTaskNotFound
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}
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// Attempt a graceful shutdown only if it was configured in the job
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|
if handle.monitorPath != "" {
|
|
if err := sendQemuShutdown(d.logger, handle.monitorPath, handle.pid); err != nil {
|
|
d.logger.Debug("error sending graceful shutdown ", "pid", handle.pid, "error", err)
|
|
}
|
|
}
|
|
|
|
// TODO(preetha) we are calling shutdown on the executor here
|
|
// after attempting a graceful qemu shutdown, qemu process may
|
|
// not be around when we call exec.shutdown
|
|
if err := handle.exec.Shutdown(signal, timeout); err != nil {
|
|
if handle.pluginClient.Exited() {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("executor Shutdown failed: %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (d *Driver) DestroyTask(taskID string, force bool) error {
|
|
handle, ok := d.tasks.Get(taskID)
|
|
if !ok {
|
|
return drivers.ErrTaskNotFound
|
|
}
|
|
|
|
if handle.IsRunning() && !force {
|
|
return fmt.Errorf("cannot destroy running task")
|
|
}
|
|
|
|
if !handle.pluginClient.Exited() {
|
|
if handle.IsRunning() {
|
|
if err := handle.exec.Shutdown("", 0); err != nil {
|
|
handle.logger.Error("destroying executor failed", "err", err)
|
|
}
|
|
}
|
|
|
|
handle.pluginClient.Kill()
|
|
}
|
|
|
|
d.tasks.Delete(taskID)
|
|
return nil
|
|
}
|
|
|
|
func (d *Driver) InspectTask(taskID string) (*drivers.TaskStatus, error) {
|
|
handle, ok := d.tasks.Get(taskID)
|
|
if !ok {
|
|
return nil, drivers.ErrTaskNotFound
|
|
}
|
|
|
|
return handle.TaskStatus(), nil
|
|
}
|
|
|
|
func (d *Driver) TaskStats(ctx context.Context, taskID string, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
|
|
handle, ok := d.tasks.Get(taskID)
|
|
if !ok {
|
|
return nil, drivers.ErrTaskNotFound
|
|
}
|
|
|
|
return handle.exec.Stats(ctx, interval)
|
|
}
|
|
|
|
func (d *Driver) TaskEvents(ctx context.Context) (<-chan *drivers.TaskEvent, error) {
|
|
return d.eventer.TaskEvents(ctx)
|
|
}
|
|
|
|
func (d *Driver) SignalTask(taskID string, signal string) error {
|
|
return fmt.Errorf("Qemu driver can't signal commands")
|
|
}
|
|
|
|
func (d *Driver) ExecTask(taskID string, cmdArgs []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
|
|
return nil, fmt.Errorf("Qemu driver can't execute commands")
|
|
|
|
}
|
|
|
|
// GetAbsolutePath returns the absolute path of the passed binary by resolving
|
|
// it in the path and following symlinks.
|
|
func GetAbsolutePath(bin string) (string, error) {
|
|
lp, err := exec.LookPath(bin)
|
|
if err != nil {
|
|
return "", fmt.Errorf("failed to resolve path to %q executable: %v", bin, err)
|
|
}
|
|
|
|
return filepath.EvalSymlinks(lp)
|
|
}
|
|
|
|
func (d *Driver) handleWait(ctx context.Context, handle *taskHandle, ch chan *drivers.ExitResult) {
|
|
defer close(ch)
|
|
var result *drivers.ExitResult
|
|
ps, err := handle.exec.Wait(ctx)
|
|
if err != nil {
|
|
result = &drivers.ExitResult{
|
|
Err: fmt.Errorf("executor: error waiting on process: %v", err),
|
|
}
|
|
} else {
|
|
result = &drivers.ExitResult{
|
|
ExitCode: ps.ExitCode,
|
|
Signal: ps.Signal,
|
|
}
|
|
}
|
|
|
|
select {
|
|
case <-ctx.Done():
|
|
case <-d.ctx.Done():
|
|
case ch <- result:
|
|
}
|
|
}
|
|
|
|
// getMonitorPath is used to determine whether a qemu monitor socket can be
|
|
// safely created and accessed in the task directory by the version of qemu
|
|
// present on the host. If it is safe to use, the socket's full path is
|
|
// returned along with a nil error. Otherwise, an empty string is returned
|
|
// along with a descriptive error.
|
|
func (d *Driver) getMonitorPath(dir string, fingerPrint *drivers.Fingerprint) (string, error) {
|
|
var longPathSupport bool
|
|
currentQemuVer := fingerPrint.Attributes[driverVersionAttr]
|
|
currentQemuSemver := semver.New(currentQemuVer.GoString())
|
|
if currentQemuSemver.LessThan(*qemuVersionLongSocketPathFix) {
|
|
longPathSupport = false
|
|
d.logger.Debug("long socket paths are not available in this version of QEMU", "version", currentQemuVer)
|
|
} else {
|
|
longPathSupport = true
|
|
d.logger.Debug("long socket paths available in this version of QEMU", "version", currentQemuVer)
|
|
}
|
|
fullSocketPath := fmt.Sprintf("%s/%s", dir, qemuMonitorSocketName)
|
|
if len(fullSocketPath) > qemuLegacyMaxMonitorPathLen && longPathSupport == false {
|
|
return "", fmt.Errorf("monitor path is too long for this version of qemu")
|
|
}
|
|
return fullSocketPath, nil
|
|
}
|
|
|
|
// sendQemuShutdown attempts to issue an ACPI power-off command via the qemu
|
|
// monitor
|
|
func sendQemuShutdown(logger hclog.Logger, monitorPath string, userPid int) error {
|
|
if monitorPath == "" {
|
|
return errors.New("monitorPath not set")
|
|
}
|
|
monitorSocket, err := net.Dial("unix", monitorPath)
|
|
if err != nil {
|
|
logger.Warn("could not connect to qemu monitor", "pid", userPid, "monitorPath", monitorPath, "error", err)
|
|
return err
|
|
}
|
|
defer monitorSocket.Close()
|
|
logger.Debug("sending graceful shutdown command to qemu monitor socket", "monitor_path", monitorPath, "pid", userPid)
|
|
_, err = monitorSocket.Write([]byte(qemuGracefulShutdownMsg))
|
|
if err != nil {
|
|
logger.Warn("failed to send shutdown message", "shutdown message", qemuGracefulShutdownMsg, "monitorPath", monitorPath, "userPid", userPid, "error", err)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (d *Driver) Shutdown() {
|
|
d.signalShutdown()
|
|
}
|