Return the current commit SHA if no new commit was created.

Author: fnesveda

commit/README.md

@@ -35,7 +35,7 @@ steps:
 
 ### Outputs
 
-- `commit-sha` — The SHA of the created commit. Empty when `committed` is `false`.
+- `commit-sha` — The SHA of the created commit, or the current commit SHA if no new commit was created.
 - `committed` — `'true'` when a commit was created, `'false'` when there were no changes to commit.
 
 ### Example: commit to a new branch

commit/index.mts

@@ -92,8 +92,9 @@ export async function main({ github, env, core }: { github: Octokit, env: Record
 
     if (fileChanges.additions.length === 0 && fileChanges.deletions.length === 0) {
         core.info('no staged changes — skipping commit');
+        const currentHeadSha = (await exec('git rev-parse HEAD', { encoding: 'utf8' })).stdout.trim();
         core.setOutput('committed', 'false');
-        core.setOutput('commit-sha', '');
+        core.setOutput('commit-sha', currentHeadSha);
         return;
     }
 

commit/index.test.mts

@@ -128,6 +128,8 @@ describe('signed commit action', () => {
         const graphql = vi.fn();
         const fakeGithub = { graphql };
 
+        const headSha = (await doExec('git rev-parse HEAD')).stdout.trim();
+
         const originalCwd = process.cwd();
         try {
             process.chdir(repoDir);
@@ -147,7 +149,7 @@ describe('signed commit action', () => {
 
         expect(graphql).not.toHaveBeenCalled();
         expect(outputs.committed).toEqual('false');
-        expect(outputs['commit-sha']).toEqual('');
+        expect(outputs['commit-sha']).toEqual(headSha);
     });
 
     it('checks file modes and does not throw when correct', async () => {