Add CODE_SCANNING_* vars to EnvVar enum

Author: mbg

lib/entry-points.js

@@ -429,8 +429,10 @@ export function getPullRequestBranches(
 
   // PR analysis under Default Setup does not have the pull_request context,
   // but it should set CODE_SCANNING_REF and CODE_SCANNING_BASE_BRANCH.
-  const codeScanningRef = env.getOptional("CODE_SCANNING_REF");
-  const codeScanningBaseBranch = env.getOptional("CODE_SCANNING_BASE_BRANCH");
+  const codeScanningRef = env.getOptional(EnvVar.CODE_SCANNING_REF);
+  const codeScanningBaseBranch = env.getOptional(
+    EnvVar.CODE_SCANNING_BASE_BRANCH,
+  );
   if (codeScanningRef && codeScanningBaseBranch) {
     return {
       base: codeScanningBaseBranch,

src/actions-util.ts

@@ -17,6 +17,18 @@ export enum EnvVar {
    */
   CLI_VERBOSITY = "CODEQL_VERBOSITY",
 
+  /**
+   * Set by Default Setup to the base branch of the PR being analysed, if analysing a PR.
+   * This is needed because the `pull_request` context is not available for `dynamic` events.
+   */
+  CODE_SCANNING_BASE_BRANCH = "CODE_SCANNING_BASE_BRANCH",
+
+  /**
+   * Set by Default Setup to the full ref being analysed, if analysing a PR.
+   * This is needed because the `pull_request` context is not available for `dynamic` events.
+   */
+  CODE_SCANNING_REF = "CODE_SCANNING_REF",
+
   /**
    * `PersistedVersionInfo` for the CodeQL CLI, so later Actions steps can reuse it instead of
    * invoking `codeql version` again.

src/environment.ts

@@ -7,6 +7,7 @@ import * as sinon from "sinon";
 
 import * as actionsUtil from "./actions-util";
 import * as api from "./api-client";
+import { EnvVar } from "./environment";
 import { Feature } from "./feature-flags";
 import { getRunnerLogger } from "./logging";
 import { getCacheRestoreKeyPrefix } from "./overlay/caching";
@@ -637,8 +638,8 @@ test.serial(
   async (t) => {
     await withTmpDir(async (tmpDir) => {
       setupActionsVars(tmpDir, tmpDir);
-      process.env["CODE_SCANNING_REF"] = "refs/heads/feature-branch";
-      process.env["CODE_SCANNING_BASE_BRANCH"] = "main";
+      process.env[EnvVar.CODE_SCANNING_REF] = "refs/heads/feature-branch";
+      process.env[EnvVar.CODE_SCANNING_BASE_BRANCH] = "main";
 
       sinon.stub(api, "getAutomationID").resolves("test/");
       const listStub = sinon.stub(api, "listActionsCaches").resolves([