codeql-action/src/setup/repository.ts

import { isRunningLocalAction } from "../actions-util";
import { Logger } from "../logging";
import * as util from "../util";

export const CODEQL_DEFAULT_ACTION_REPOSITORY = "github/codeql-action";

export function getCodeQLActionRepository(logger: Logger): string {
  if (isRunningLocalAction()) {
    // This handles the case where the Action does not come from an Action repository,
    // e.g. our integration tests which use the Action code from the current checkout.
    // In these cases, the GITHUB_ACTION_REPOSITORY environment variable is not set.
    logger.info(
      "The CodeQL Action is checked out locally. Using the default CodeQL Action repository.",
    );
    return CODEQL_DEFAULT_ACTION_REPOSITORY;
  }

  return util.getRequiredEnvParam("GITHUB_ACTION_REPOSITORY");
}