Method forkWorkspace

src/node/runtime/CoderSSHRuntime.ts:749–769

* Fork workspace: delegates to SSHRuntime, but marks both source and fork * as existingWorkspace=true so neither can delete the shared Coder workspace. * * IMPORTANT: Also updates this instance's coderConfig so that if postCreateSetup * runs on this same runtime instance (for the forked

(params: WorkspaceForkParams)

   * to create a new Coder workspace.
   */
  override async forkWorkspace(params: WorkspaceForkParams): Promise<WorkspaceForkResult> {
    const result = await super.forkWorkspace(params);
    // Coder tasks must share the parent's VM - don't fall back to creating a new one
    if (!result.success) return { ...result, failureIsFatal: true };

    // Both workspaces now share the Coder workspace - mark as existing so
    // deleting either mux workspace won't destroy the underlying Coder workspace
    const sharedCoderConfig = { ...this.coderConfig, existingWorkspace: true };

    // Update this instance's config so postCreateSetup() skips coder create
    this.coderConfig = sharedCoderConfig;

    const sshConfig = this.getConfig();
    const sharedRuntimeConfig = { type: "ssh" as const, ...sshConfig, coder: sharedCoderConfig };

    return {
      ...result,
      forkedRuntimeConfig: sharedRuntimeConfig,
      sourceRuntimeConfig: sharedRuntimeConfig,
    };
  }

  /**
   * Post-create setup: provision Coder workspace and configure SSH.