add additional parameter for controlling fallback sha

README.md

@@ -43,6 +43,7 @@ If your workflow runs are expected to contain no-longer existing commit SHAs (e.
 | `workflow` | Workflow name to look for. | "" |
 | `job` | Job name to look for. | "" |
 | `verify` | Verify workflow commit SHA against list of SHAs in repository | `false` |
+| `fallbackToEarliestSha` | If SHA of last successful commit can not be determined, use earliest (true) or triggering sha (false) | `false` |
 
 
 ### Action outputs

action.yml

@@ -22,6 +22,10 @@ inputs:
     description: 'Verify SHA of workflow run commit against list of commit SHAs in repository'
     required: false
     default: 'false'
+  fallbackToEarliestSha:
+    description: 'If SHA of last successful commit can not be determined, use earliest (true) or triggering sha (false)'
+    required: false
+    default: 'false'
 outputs:
   sha:
     description: 'Sha of the workflow-run matching the requirements.'

dist/index.js

@@ -28976,7 +28976,8 @@ function run() {
                 branch: core.getInput("branch"),
                 workflow: core.getInput("workflow"),
                 job: core.getInput("job"),
-                verify: core.getInput("verify") === "true" ? true : false
+                verify: core.getInput("verify") === "true" ? true : false,
+                fallbackToEarliestSha: core.getInput("fallbackToEarliestSha") === "true" ? true : false
             };
             const octokit = github.getOctokit(inputs.token);
             const repository = process.env.GITHUB_REPOSITORY;
@@ -29039,8 +29040,9 @@ function run() {
                 core.info(`No previous runs found for branch ${inputs.branch}.`);
             }
             if (!sha) {
-                core.warning(`Unable to determine SHA of last successful commit (possibly outside the window of ${runs.length} runs). Using earliest SHA available and run id for current commit.`);
-                sha = lastSha;
+                core.warning(`Unable to determine SHA of last successful commit (possibly outside the window of ${runs.length} runs). 
+                Using ${inputs.fallbackToEarliestSha ? "earliest available" : "triggering"} SHA and run id for current commit.`);
+                sha = inputs.fallbackToEarliestSha ? lastSha : triggeringSha;
                 runId = parseInt(process.env.GITHUB_RUN_ID);
             }
             core.setOutput('sha', sha);

src/main.ts

@@ -36,7 +36,8 @@ async function run(): Promise<void> {
             branch: core.getInput("branch"),
             workflow: core.getInput("workflow"),
             job: core.getInput("job"),
-            verify: core.getInput("verify") === "true" ? true : false
+            verify: core.getInput("verify") === "true" ? true : false,
+            fallbackToEarliestSha: core.getInput("fallbackToEarliestSha") === "true" ? true : false
         };
 
         const octokit = github.getOctokit(inputs.token);
@@ -113,8 +114,9 @@ async function run(): Promise<void> {
         }
 
         if (!sha) {
-            core.warning(`Unable to determine SHA of last successful commit (possibly outside the window of ${runs.length} runs). Using earliest SHA available and run id for current commit.`);
-            sha = lastSha;
+            core.warning(`Unable to determine SHA of last successful commit (possibly outside the window of ${runs.length} runs). 
+                Using ${inputs.fallbackToEarliestSha ? "earliest available" : "triggering" } SHA and run id for current commit.`);
+            sha = inputs.fallbackToEarliestSha ? lastSha : triggeringSha;
             runId = parseInt(process.env.GITHUB_RUN_ID as string);
         }