Method validateBeforePersist

src/node/runtime/CoderSSHRuntime.ts:524–554

* Validate before persisting workspace metadata. * Checks if a Coder workspace with this name already exists.

(
    _finalBranchName: string,
    config: RuntimeConfig
  )

   * Checks if a Coder workspace with this name already exists.
   */
  async validateBeforePersist(
    _finalBranchName: string,
    config: RuntimeConfig
  ): Promise<Result<void, string>> {
    if (!isSSHRuntime(config) || !config.coder) {
      return Ok(undefined);
    }

    // Skip for "existing" mode - user explicitly selected an existing workspace
    if (config.coder.existingWorkspace) {
      return Ok(undefined);
    }

    const workspaceName = config.coder.workspaceName;
    if (!workspaceName) {
      return Ok(undefined);
    }

    const exists = await this.coderService.workspaceExists(workspaceName);

    if (exists) {
      await this.coderService.disposeProvisioningSession(workspaceName);
      return Err(
        `A Coder workspace named "${workspaceName}" already exists. ` +
          `Either switch to "Existing" mode to use it, delete/rename it in Coder, ` +
          `or choose a different mux workspace name.`
      );
    }

    return Ok(undefined);
  }

  /**
   * Create workspace (fast path only - no SSH needed).