fix: bug with retrieving the base sha when since last commit is enabled (#1213)

Co-authored-by: GitHub Action <action@github.com>

dist/index.js

@@ -436,16 +436,9 @@ const getSHAForPullRequestEvent = (inputs, env, workingDirectory, isShallow, has
         if (inputs.sinceLastRemoteCommit) {
             previousSha = env.GITHUB_EVENT_BEFORE;
             if (!previousSha) {
-                previousSha = yield (0, utils_1.getRemoteBranchHeadSha)({
+                previousSha = yield (0, utils_1.getParentSha)({ cwd: workingDirectory });
-                    cwd: workingDirectory,
-                    branch: currentBranch
-                });
             }
-            if ((yield (0, utils_1.verifyCommitSha)({
+            if (!previousSha) {
-                sha: previousSha,
-                cwd: workingDirectory,
-                showAsErrorMessage: false
-            })) !== 0) {
                 previousSha = env.GITHUB_EVENT_PULL_REQUEST_BASE_SHA;
             }
         }
@@ -1524,7 +1517,7 @@ const getHeadSha = ({ cwd }) => __awaiter(void 0, void 0, void 0, function* () {
 });
 exports.getHeadSha = getHeadSha;
 const getRemoteBranchHeadSha = ({ cwd, branch }) => __awaiter(void 0, void 0, void 0, function* () {
-    const { stdout } = yield exec.getExecOutput('git', ['rev-parse', `refs/remotes/origin/${branch}`], {
+    const { stdout } = yield exec.getExecOutput('git', ['rev-parse', `origin/${branch}`], {
         cwd,
         silent: process.env.RUNNER_DEBUG !== '1'
     });

src/commitSha.ts

@@ -360,19 +360,10 @@ export const getSHAForPullRequestEvent = async (
       previousSha = env.GITHUB_EVENT_BEFORE
 
       if (!previousSha) {
-        previousSha = await getRemoteBranchHeadSha({
+        previousSha = await getParentSha({cwd: workingDirectory})
-          cwd: workingDirectory,
-          branch: currentBranch
-        })
       }
 
-      if (
+      if (!previousSha) {
-        (await verifyCommitSha({
-          sha: previousSha,
-          cwd: workingDirectory,
-          showAsErrorMessage: false
-        })) !== 0
-      ) {
         previousSha = env.GITHUB_EVENT_PULL_REQUEST_BASE_SHA
       }
     } else {

src/utils.ts

@@ -510,7 +510,7 @@ export const getRemoteBranchHeadSha = async ({
 }): Promise<string> => {
   const {stdout} = await exec.getExecOutput(
     'git',
-    ['rev-parse', `refs/remotes/origin/${branch}`],
+    ['rev-parse', `origin/${branch}`],
     {
       cwd,
       silent: process.env.RUNNER_DEBUG !== '1'