Optionally cancel all workflows but the latest

README.md

@@ -6,7 +6,7 @@ This includes runs with a [status](https://docs.github.com/en/rest/reference/che
 
 ## How does it work?
 
-When you `git push`, this GitHub Action will capture the current Branch and SHA. It will query GitHub's API to find previous workflow runs that match the Branch but do not match the SHA. These in-progress runs will be canceled leaving only the latest run.
+When you `git push`, this GitHub Action will capture the current Branch and SHA. It will query GitHub's API to find previous workflow runs that match the Branch but do not match the SHA. These in-progress runs will be cancelled leaving only this run.
 
 Read more about the [Workflow Runs API](https://docs.github.com/en/rest/reference/actions#workflow-runs).
 
@@ -100,6 +100,28 @@ jobs:
           workflow_id: 479426
 ```
 
+## Advanced: Cancel more recent workflows
+
+Because this action can only cancel workflows if it is actually being run, it only helps if the pipeline isn't saturated and there are still runners available to schedule the workflow.
+By default, this action does not cancel any workflows older than itself. The optional flag ``all_but_latest`` switches to a mode where the action also cancels itself and all later-scheduled workflows but the last one.
+
+```yml
+name: Cancel
+on: [push]
+jobs:
+  cancel:
+    name: 'Cancel Previous Runs'
+    runs-on: ubuntu-latest
+    timeout-minutes: 3
+    steps:
+      - uses: styfle/cancel-workflow-action@0.8.0
+        with:
+          all_but_latest: true
+          access_token: ${{ github.token }}
+```
+
+At the time of writing `0.8.0` is the latest release but you can select any [release](https://github.com/styfle/cancel-workflow-action/releases).
+
 ## Contributing
 
 - Clone this repo

action.yml

@@ -2,7 +2,7 @@ name: 'Cancel Workflow Action'
 description: 'This Action will cancel any previous runs that are not `completed` for a given workflow.'
 author: styfle
 branding:
-  icon: 'stop-circle'  
+  icon: 'stop-circle'
   color: 'white'
 inputs:
   workflow_id:
@@ -15,6 +15,10 @@ inputs:
   access_token:
     description: 'Your GitHub Access Token, defaults to: {{ github.token }}'
     default: '${{ github.token }}'
+    required: true
+  all_but_latest:
+    description: "Cancel all actions but the last one"
+    required: false
 runs:
   using: 'node12'
   main: 'dist/index.js'

src/index.ts

@@ -27,6 +27,7 @@ async function main() {
   const token = core.getInput('access_token', { required: true });
   const workflow_id = core.getInput('workflow_id', { required: false });
   const ignore_sha = core.getInput('ignore_sha', { required: false }) === 'true';
+  const all_but_latest = core.getInput('all_but_latest', { required: false });
   console.log(`Found token: ${token ? 'yes' : 'no'}`);
   const workflow_ids: string[] = [];
   const octokit = github.getOctokit(token);
@@ -58,20 +59,35 @@ async function main() {
         workflow_id,
         branch,
       });
+      console.log(`Found ${data.total_count} runs total.`);
 
-      const branchWorkflows = data.workflow_runs.filter(run => run.head_branch === branch);
-      console.log(`Found ${branchWorkflows.length} runs for workflow ${workflow_id} on branch ${branch}`);
-      console.log(branchWorkflows.map(run => `- ${run.html_url}`).join('\n'));
+      let cancel_before;
+      if (all_but_latest) {
+        cancel_before = new Date(data.workflow_runs.reduce((a, b) => Math.max(a.created_at, b.created_at)));
+      } else {
+        cancel_before = new Date(current_run.created_at);
+      }
 
-      const runningWorkflows = branchWorkflows.filter(run =>
-        (ignore_sha || run.head_sha !== headSha) &&
-        run.status !== 'completed' &&
-        new Date(run.created_at) < new Date(current_run.created_at)
+      const runningWorkflows = data.workflow_runs.filter(
+        run => run.head_branch === branch && (ignore_sha || run.head_sha !== headSha) && run.status !== 'completed' &&
+            run != current_run &&
+            new Date(run.created_at) < cancel_before
       );
-      console.log(`with ${runningWorkflows.length} runs to cancel.`);
-
-      for (const {id, head_sha, status, html_url} of runningWorkflows) {
-        console.log('Canceling run: ', {id, head_sha, status, html_url});
+      console.log(`Found ${runningWorkflows.length} runs to cancel.`);
+      for (const {id, head_sha, status} of runningWorkflows) {
+        console.log('Cancelling another run: ', {id, head_sha, status});
+        const res = await octokit.actions.cancelWorkflowRun({
+          owner,
+          repo,
+          run_id: id
+        });
+        console.log(`Cancel run ${id} responded with status ${res.status}`);
+      }
+      // Make sure we cancel this run itself if it's out-of-date.
+      // We postponed canceling this run because otherwise we couldn't cancel the rest.
+      if (all_but_latest && new Date(current_run.created_at) < cancel_before) {
+        // FIXME actions/core doesn't support cancelling, so we need to do it through the API
+        const id = current_run.id;
         const res = await octokit.actions.cancelWorkflowRun({
           owner,
           repo,