From 3d260cc741a317ba8e075b18c07a9d0a82e6877c Mon Sep 17 00:00:00 2001
From: Marten Seemann <martenseemann@gmail.com>
Date: Fri, 8 Jan 2021 20:23:38 +0800
Subject: [PATCH] add a workflow to manually trigger a rebase of a PR opened by
 ipldbot

This is useful in repositories where the update of a workflow initially
fails, and the problem is subsequently fixed. It's necessary to rebase
the PR updating the workflow to make sure that all tests now actually
pass.

The new workflow (which will distribited to every participating repo)
achieves this by running on every issue comment, and triggers a rebase
if the comment was made on a PR opened by ipldbot, and it contains the
keywords "@ipldbot rebase".
---
 .github/workflows/copy-workflow.yml |  8 ++++++--
 workflow-templates/autorebase.yml   | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 workflow-templates/autorebase.yml

diff --git a/.github/workflows/copy-workflow.yml b/.github/workflows/copy-workflow.yml
index 20898fc6..e6fbd04d 100644
--- a/.github/workflows/copy-workflow.yml
+++ b/.github/workflows/copy-workflow.yml
@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         cfg: ${{ fromJson(needs.matrix.outputs.targets) }}
-        workflow: [ "go-test", "go-check" ]
+        workflow: [ "autorebase", "go-test", "go-check" ]
     env:
       WORKFLOW_DIR: "workflow-repo"
       FILE: "${{ matrix.workflow }}.yml"
@@ -64,7 +64,11 @@ jobs:
       with:
         commit-message: update ${{ env.FILE }}
         title: update ${{ matrix.workflow }} workflow
-        body: update to https://github.com/${{ github.repository }}/commit/${{ github.sha }}
+        body:  |
+          update to https://github.com/${{ github.repository }}/commit/${{ github.sha }}
+
+          ---
+          You can trigger a rebase by commenting `@ipldbot rebase`.
         token: ${{ secrets.IPLDBOT_GITHUB_TOKEN }}
         committer: ipldbot <ipldbot@users.noreply.github.com>
         author: ipldbot <ipldbot@users.noreply.github.com>
diff --git a/workflow-templates/autorebase.yml b/workflow-templates/autorebase.yml
new file mode 100644
index 00000000..e5355482
--- /dev/null
+++ b/workflow-templates/autorebase.yml
@@ -0,0 +1,22 @@
+# Allow PRs opened by ipldbot to be rebased by commenting "@ipldbot rebase" on the PR.
+
+on: 
+  issue_comment:
+    types: [ created ]
+    
+name: Automatic Rebase
+jobs:
+  rebase:
+    name: Rebase
+    if: github.event.issue.pull_request != '' && github.event.issue.user.login == 'ipldbot' && contains(github.event.comment.body, '@ipldbot rebase')
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout the latest code
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+        token: ${{ secrets.IPLDBOT_GITHUB_TOKEN }}
+    - name: Automatic Rebase
+      uses: cirrus-actions/rebase@1.4
+      env:
+        GITHUB_TOKEN: ${{ secrets.IPLDBOT_GITHUB_TOKEN }}