80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
package taskrunner
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import (
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"context"
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"strings"
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log "github.com/hashicorp/go-hclog"
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"github.com/hashicorp/nomad/client/allocdir"
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"github.com/hashicorp/nomad/client/allocrunner/interfaces"
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cconfig "github.com/hashicorp/nomad/client/config"
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"github.com/hashicorp/nomad/client/taskenv"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/hashicorp/nomad/plugins/drivers"
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)
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type taskDirHook struct {
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runner *TaskRunner
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logger log.Logger
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}
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func newTaskDirHook(runner *TaskRunner, logger log.Logger) *taskDirHook {
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td := &taskDirHook{
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runner: runner,
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}
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td.logger = logger.Named(td.Name())
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return td
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}
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func (h *taskDirHook) Name() string {
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// Copied in client/state when upgrading from <0.9 schemas, so if you
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// change it here you also must change it there.
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return "task_dir"
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}
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func (h *taskDirHook) Prestart(ctx context.Context, req *interfaces.TaskPrestartRequest, resp *interfaces.TaskPrestartResponse) error {
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cc := h.runner.clientConfig
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chroot := cconfig.DefaultChrootEnv
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if len(cc.ChrootEnv) > 0 {
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chroot = cc.ChrootEnv
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}
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// Emit the event that we are going to be building the task directory
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h.runner.EmitEvent(structs.NewTaskEvent(structs.TaskSetup).SetMessage(structs.TaskBuildingTaskDir))
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// Build the task directory structure
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fsi := h.runner.driverCapabilities.FSIsolation
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err := h.runner.taskDir.Build(fsi == drivers.FSIsolationChroot, chroot)
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if err != nil {
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return err
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}
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// Update the environment variables based on the built task directory
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setEnvvars(h.runner.envBuilder, fsi, h.runner.taskDir, h.runner.clientConfig)
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resp.Done = true
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return nil
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}
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// setEnvvars sets path and host env vars depending on the FS isolation used.
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func setEnvvars(envBuilder *taskenv.Builder, fsi drivers.FSIsolation, taskDir *allocdir.TaskDir, conf *cconfig.Config) {
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// Set driver-specific environment variables
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switch fsi {
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case drivers.FSIsolationNone:
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// Use host paths
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envBuilder.SetAllocDir(taskDir.SharedAllocDir)
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envBuilder.SetTaskLocalDir(taskDir.LocalDir)
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envBuilder.SetSecretsDir(taskDir.SecretsDir)
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default:
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// filesystem isolation; use container paths
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envBuilder.SetAllocDir(allocdir.SharedAllocContainerPath)
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envBuilder.SetTaskLocalDir(allocdir.TaskLocalContainerPath)
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envBuilder.SetSecretsDir(allocdir.TaskSecretsContainerPath)
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}
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// Set the host environment variables for non-image based drivers
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if fsi != drivers.FSIsolationImage {
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filter := strings.Split(conf.ReadDefault("env.blacklist", cconfig.DefaultEnvBlacklist), ",")
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envBuilder.SetHostEnvvars(filter)
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}
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}
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