build: Add GitHub scripts for rebasing PRs (#18359)

PR Close #18359
2017-07-26 12:37:14 -07:00 · 2017-07-26 12:37:14 -07:00 · d1764fc3dd
parent 2e714f9f2a
commit d1764fc3dd
10 changed files with 706 additions and 2 deletions
--- a/docs/CARETAKER.md
+++ b/docs/CARETAKER.md
@ -0,0 +1,92 @@
+# Caretaker
+
+Caretaker is responsible for merging PRs into the individual branches and internally at Google.
+
+## Responsibilities
+
+- Draining the queue of PRs ready to be merged. (PRs with [`PR action: merge`](https://github.com/angular/angular/pulls?q=is%3Aopen+is%3Apr+label%3A%22PR+action%3A+merge%22) label)
+- Assigining [new issues](https://github.com/angular/angular/issues?q=is%3Aopen+is%3Aissue+no%3Alabel) to individual component authors.
+
+## Setup
+
+### Set `upstream` to fetch PRs into your local repo
+
+Use this conmmands to configure your `git` to fetch PRs into your local repo.
+
+```
+git remote add upstream git@github.com:angular/angular.git
+git config --add remote.upstream.fetch +refs/pull/*/head:refs/remotes/upstream/pr/*
+```
+
+
+## Merging the PR
+
+A PR needs to have `PR action: merge` and `PR target: *` labels to be considered
+ready to merge. Merging is performed by running `merge-pr` with a PR number to merge.
+
+NOTE: before running `merge-pr` ensure that you have synced all of the PRs
+locally by running:
+
+```
+$ git fetch upstream
+```
+
+To merge a PR run:
+
+```
+$ ./scripts/github/merge-pr 1234
+```
+
+The `merge-pr` script will:
+- Ensure that all approriate labels are on the PR.
+- That the current branch (`master` or `?.?.x` patch) mathches the `PR target: *` label.
+- It will `cherry-pick` all of the SHAs from the PR into the current branch.
+- It will rewrite commit history by automatically adding `Close #1234` and `(#1234)` into the commit message.
+
+
+### Recovering from failed `merge-pr` due to conflicts
+
+When running `merge-pr` the script will output the commands which it is about to run.
+
+```
+$ ./scripts/github/merge-pr 1234
+======================
+GitHub Merge PR Steps
+======================
+   git cherry-pick upstream/pr/1234~1..upstream/pr/1234
+   git filter-branch -f --msg-filter "/usr/local/google/home/misko/angular-pr/scripts/github/utils/github.closes 1234" HEAD~1..HEAD
+```
+
+If the `cherry-pick` command fails than resolve conflicts and use `git cherry-pick --continue` once ready. After the `cherry-pick` is done cut&paste and run the `filter-branch` command to properly rewrite the messages
+
+## Cherry-picking PRs into patch branch
+
+In addition to merging PRs into the master branch, many PRs need to be also merged into a patch branch.
+Follow these steps to get path brach up to date.
+
+1. Check out the most recent patch branch: `git checkout 4.3.x`
+2. Get a list of PRs merged into master: `git log master --oneline -n10`
+3. For each PR number in the commit message run: `././scripts/github/merge-pr 1234`
+   - The PR will only merge if the `PR target:` matches the branch.
+
+Once all of the PRs are in patch branch, push the all branches and tags to github using `push-upstream` script.
+
+
+## Pushing merged PRs into github
+
+Use `push-upstream` script to push all of the branch and tags to github.
+
+```
+$ ./scripts/github/push-upstream
+git push git@github.com:angular/angular.git master:master 4.3.x:4.3.x
+Counting objects: 25, done.
+Delta compression using up to 6 threads.
+Compressing objects: 100% (17/17), done.
+Writing objects: 100% (25/25), 2.22 KiB | 284.00 KiB/s, done.
+Total 25 (delta 22), reused 8 (delta 7)
+remote: Resolving deltas: 100% (22/22), completed with 18 local objects.
+To github.com:angular/angular.git
+   079d884b6..d1c4a94bb  master -> master
+git push --tags -f git@github.com:angular/angular.git patch_sync:patch_sync
+Everything up-to-date
+```
--- a/docs/COMMITTER.md
+++ b/docs/COMMITTER.md
@ -13,8 +13,8 @@ Change approvals in our monorepo are managed via [pullapprove.com](https://about

 # Merging

-Once a change has all the approvals either the last approver or the PR author (if PR author has the project collaborator status) should mark the PR with "PR: merge" label.
-This signals to the caretaker that the PR should be merged.
+Once a change has all the approvals either the last approver or the PR author (if PR author has the project collaborator status) should mark the PR with `PR: merge` as well as `PR target: *` labels.
+This signals to the caretaker that the PR should be merged. See [merge instructions](../CARETAKER.md).

 # Who is the Caretaker?

--- a/scripts/github/merge-pr
+++ b/scripts/github/merge-pr
@ -0,0 +1,90 @@
+#!/bin/sh
+
+set -u -e -o pipefail
+
+BASEDIR=$(dirname "$0")
+BASEDIR=`(cd $BASEDIR; pwd)`
+
+if [ $# -eq 0 ]; then
+  echo "Merge github PR into the current branch"
+  echo
+  echo "$0 PR_NUMBER"
+  echo
+  exit 0
+fi
+
+PR_NUMBER="$1"
+CURRENT_BRANCH=`git rev-parse --abbrev-ref HEAD`
+PR_SHA_COUNT=`curl -s https://api.github.com/repos/angular/angular/pulls/$PR_NUMBER | node $BASEDIR/utils/json_extract.js commits`
+PR_LABELS=`curl -s https://api.github.com/repos/angular/angular/issues/$PR_NUMBER/labels`
+PR_ACTION=`echo "$PR_LABELS" | node $BASEDIR/utils/json_extract.js "name=^PR action:"`
+PR_TARGET=`echo "$PR_LABELS"  | node $BASEDIR/utils/json_extract.js "name=^PR target:"`
+PR_CLA=`echo "$PR_LABELS"  | node $BASEDIR/utils/json_extract.js "name=^cla"`
+MASTER_BRANCH='master'
+SHA=`git rev-parse HEAD`
+PATCH_BRANCH=`git branch --list '*.x' | cut -d ' ' -f2- | sort -r | head -n1`
+# Trim whitespace
+PATCH_BRANCH=`echo $PATCH_BRANCH`
+
+if [[ "$PR_ACTION" != "PR action: merge" ]]; then
+  echo The PR is missing 'PR action: merge' label, found: $PR_ACTION
+  exit 1
+fi
+
+if [[ "$PR_CLA" != "cla: yes" ]]; then
+  echo The PR is missing 'cla: Yes' label, found: $PR_CLA
+  exit 1
+fi
+
+
+if [[ $PR_TARGET == "PR target: master & patch" ]]; then
+  MERGE_MASTER=1
+  MERGE_PATCH=1
+elif [[ $PR_TARGET == "PR target: master-only" ]]; then
+  MERGE_MASTER=1
+  MERGE_PATCH=0
+elif [[ $PR_TARGET == "PR target: patch-only" ]]; then
+  MERGE_MASTER=0
+  MERGE_PATCH=1
+else
+  echo "Unknown PR target format: $PR_TARGET"
+  exit 1;
+fi
+
+if [[ $CURRENT_BRANCH == $MASTER_BRANCH ]]; then
+  if [[ $MERGE_MASTER == 0 ]]; then
+    echo "This PR is not intended for master branch: $PR_TARGET"
+    exit 1
+  fi
+elif [[ $CURRENT_BRANCH == $PATCH_BRANCH ]]; then
+  if [[ $MERGE_PATCH == 0 ]]; then
+    echo "This PR is not intended for patch branch: $PR_TARGET"
+    exit 1
+  fi
+else
+  echo "Current branch $CURRENT_BRANCH does not match $MASTER_BRANCH or $PATCH_BRANCH."
+  exit 1
+fi
+
+
+CHERRY_PICK_PR="git cherry-pick upstream/pr/$PR_NUMBER~$PR_SHA_COUNT..upstream/pr/$PR_NUMBER"
+REWRITE_MESSAGE="git filter-branch -f --msg-filter \"$BASEDIR/utils/github_closes.js $PR_NUMBER\" HEAD~$PR_SHA_COUNT..HEAD"
+
+echo "======================"
+echo "GitHub Merge PR Steps"
+echo "======================"
+echo "   $CHERRY_PICK_PR"
+echo "   $REWRITE_MESSAGE"
+echo "----------------------"
+
+echo ">>> Cherry Pick: $CHERRY_PICK_PR"
+$CHERRY_PICK_PR
+
+echo
+echo ">>> Rewrite Messages: $REWRITE_MESSAGE"
+# Next line should work, but it errors, hence copy paste the command.
+# $REWRITE_MESSAGE
+git filter-branch -f --msg-filter "$BASEDIR/utils/github_closes.js $PR_NUMBER" HEAD~$PR_SHA_COUNT..HEAD
+
+echo
+echo ">>>>>> SUCCESS <<<<<<"
--- a/scripts/github/push-upstream
+++ b/scripts/github/push-upstream
@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -u -e -o pipefail
+
+PATCH_BRANCH=`git branch --list '*.x' | cut -d ' ' -f2- | sort -r | head -n1`
+# Trim whitespace
+PATCH_BRANCH=`echo $PATCH_BRANCH`
+
+PUSH_BRANCHES="git push git@github.com:angular/angular.git master:master $PATCH_BRANCH:$PATCH_BRANCH"
+
+echo $PUSH_BRANCHES
+$PUSH_BRANCHES
--- a/scripts/github/rebase-pr
+++ b/scripts/github/rebase-pr
@ -0,0 +1,45 @@
+#!/bin/sh
+
+set -u -e -o pipefail
+
+BASEDIR=$(dirname "$0")
+
+if [ $# -eq 0 ]; then
+    echo "Rebase github PR onto a branch"
+    echo
+    echo "$0 branch_to_rebase_on PR_NUMBER"
+    echo
+    exit 0
+fi
+
+REBASE_ON="$1"
+PR_NO="$2"
+
+
+HEAD_LABEL=`curl -s https://api.github.com/repos/angular/angular/pulls/$PR_NO | node $BASEDIR/utils/json_extract.js head.label`
+echo $HEAD_LABEL
+IFS=':' read -r -a array <<< "$HEAD_LABEL"
+USER="${array[0]}"
+USER_GIT_URL="git@github.com:$USER/angular.git"
+BRANCH="${array[1]}"
+OLD_BRANCH=`git branch | grep \* | cut -d ' ' -f2`
+
+echo =====================================================
+echo Rebasing $USER_GIT_URL branch $BRANCH onto $REBASE_ON
+echo =====================================================
+
+git fetch $USER_GIT_URL $BRANCH
+git co FETCH_HEAD
+PUSH_CMD="git push $USER_GIT_URL HEAD:$BRANCH -f";
+RESTORE_CMD="git co $OLD_BRANCH"
+git rebase upstream/master
+if [ $? -eq 0 ]; then
+    $PUSH_CMD
+    $RESTORE_CMD
+else
+    echo ===========================
+    echo Git rebase failed. RECOVER WITH:
+    echo "       $PUSH_CMD"
+    echo "       $RESTORE_CMD"
+    echo ===========================
+fi
--- a/scripts/github/utils/github_closes.js
+++ b/scripts/github/utils/github_closes.js
@ -0,0 +1,28 @@
+#!/usr/bin/env node
+
+var msg = '';
+
+if (require.main === module) {
+  process.stdin.setEncoding('utf8');
+
+  process.stdin.on('readable', () => {
+    const chunk = process.stdin.read();
+    if (chunk !== null) {
+      msg += chunk;
+    }
+  });
+
+  process.stdin.on('end', () => {
+    var argv = process.argv.slice(2);
+    console.log(rewriteMsg(msg, argv[0]));
+  });
+}
+
+function rewriteMsg(msg, prNo) {
+  var lines = msg.split(/\n/);
+  lines[0] += ' (#' + prNo +')';
+  lines.push('PR Close #' + prNo);
+  return lines.join('\n');
+}
+
+exports.rewriteMsg = rewriteMsg;
--- a/scripts/github/utils/json_extract.js
+++ b/scripts/github/utils/json_extract.js
@ -0,0 +1,54 @@
+#!/usr/bin/env node
+
+var json = '';
+
+if (require.main === module) {
+  process.stdin.setEncoding('utf8');
+
+  process.stdin.on('readable', () => {
+    const chunk = process.stdin.read();
+    if (chunk !== null) {
+      json += chunk;
+    }
+  });
+
+  process.stdin.on('end', () => {
+    var obj = JSON.parse(json);
+    var argv = process.argv.slice(2);
+    extractPaths(obj, argv).forEach(function(line) {
+      console.log(line);
+    })
+  });
+}
+
+function extractPaths(obj, paths) {
+  var lines = [];
+  paths.forEach(function(exp) {
+    var objs = obj instanceof Array ? [].concat(obj) : [obj];
+    exp.split('.').forEach(function(name) {
+      for(var i = 0; i < objs.length; i++) {
+        var o = objs[i];
+        if (o instanceof Array) {
+          // Expand and do over
+          objs = objs.slice(0, i).concat(o).concat(objs.slice(i+1, objs.length));
+          i--;
+        } else {
+          name.split("=").forEach(function(name, index) {
+            if (index == 0) {
+              objs[i] = o = o[name];
+            } else if (name.charAt(0) == '^') {
+              if (o.indexOf(name.substr(1)) !== 0) {
+                objs.splice(i, 1);
+                i--;
+              }
+            }
+          });
+        }
+      }
+    });
+    lines.push(objs.join("|"));
+  });
+  return lines;
+}
+
+exports.extractPaths = extractPaths;
--- a/scripts/github/utils/json_extract_test.js
+++ b/scripts/github/utils/json_extract_test.js
@ -0,0 +1,39 @@
+#!/usr/bin/env node
+
+var assert = require("assert");
+var extractPaths = require('./json_extract').extractPaths;
+
+var SAMPLE_LABELS = [
+  {
+    "id": 149476251,
+    "url": "https://api.github.com/repos/angular/angular/labels/cla:%20yes",
+    "name": "cla: yes",
+    "color": "009800",
+    "default": false
+  },
+  {
+    "id": 533874619,
+    "url": "https://api.github.com/repos/angular/angular/labels/comp:%20aio",
+    "name": "comp: aio",
+    "color": "c7def8",
+    "default": false
+  },
+  {
+    "id": 133556520,
+    "url": "https://api.github.com/repos/angular/angular/labels/PR%20action:%20merge",
+    "name": "PR action: merge",
+    "color": "99ff66",
+    "default": false
+  },
+  {
+    "id": 655699838,
+    "url": "https://api.github.com/repos/angular/angular/labels/PR%20target:%20master%20&%20patch",
+    "name": "PR target: master & patch",
+    "color": "5319e7",
+    "default": false
+  }
+];
+
+assert.deepEqual(extractPaths({head: {label: 'value1'}}, ['head.label']), ['value1']);
+assert.deepEqual(extractPaths(SAMPLE_LABELS, ['name']), ['cla: yes|comp: aio|PR action: merge|PR target: master & patch']);
+assert.deepEqual(extractPaths(SAMPLE_LABELS, ['name=^PR target:']), ['PR target: master & patch']);
--- a/scripts/github/utils/labels.json
+++ b/scripts/github/utils/labels.json
@ -0,0 +1,30 @@
+[
+  {
+    "id": 149476251,
+    "url": "https://api.github.com/repos/angular/angular/labels/cla:%20yes",
+    "name": "cla: yes",
+    "color": "009800",
+    "default": false
+  },
+  {
+    "id": 533874619,
+    "url": "https://api.github.com/repos/angular/angular/labels/comp:%20aio",
+    "name": "comp: aio",
+    "color": "c7def8",
+    "default": false
+  },
+  {
+    "id": 133556520,
+    "url": "https://api.github.com/repos/angular/angular/labels/PR%20action:%20merge",
+    "name": "PR action: merge",
+    "color": "99ff66",
+    "default": false
+  },
+  {
+    "id": 655699838,
+    "url": "https://api.github.com/repos/angular/angular/labels/PR%20target:%20master%20&%20patch",
+    "name": "PR target: master & patch",
+    "color": "5319e7",
+    "default": false
+  }
+]
--- a/scripts/github/utils/pulls.json
+++ b/scripts/github/utils/pulls.json
@ -0,0 +1,314 @@
+{
+  "url": "https://api.github.com/repos/angular/angular/pulls/18730",
+  "id": 136020267,
+  "html_url": "https://github.com/angular/angular/pull/18730",
+  "diff_url": "https://github.com/angular/angular/pull/18730.diff",
+  "patch_url": "https://github.com/angular/angular/pull/18730.patch",
+  "issue_url": "https://api.github.com/repos/angular/angular/issues/18730",
+  "number": 18730,
+  "state": "open",
+  "locked": false,
+  "title": "docs(aio): typo in metadata guide",
+  "user": {
+    "login": "cexbrayat",
+    "id": 411874,
+    "avatar_url": "https://avatars3.githubusercontent.com/u/411874?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/cexbrayat",
+    "html_url": "https://github.com/cexbrayat",
+    "followers_url": "https://api.github.com/users/cexbrayat/followers",
+    "following_url": "https://api.github.com/users/cexbrayat/following{/other_user}",
+    "gists_url": "https://api.github.com/users/cexbrayat/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/cexbrayat/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/cexbrayat/subscriptions",
+    "organizations_url": "https://api.github.com/users/cexbrayat/orgs",
+    "repos_url": "https://api.github.com/users/cexbrayat/repos",
+    "events_url": "https://api.github.com/users/cexbrayat/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/cexbrayat/received_events",
+    "type": "User",
+    "site_admin": false
+  },
+  "body": "## PR Type\r\n\r\nSimple typo fix in aio guide\r\n\r\n<!-- Please check the one that applies to this PR using \"x\". -->\r\n```\r\n[ ] Bugfix\r\n[ ] Feature\r\n[ ] Code style update (formatting, local variables)\r\n[ ] Refactoring (no functional changes, no api changes)\r\n[ ] Build related changes\r\n[ ] CI related changes\r\n[x] Documentation content changes\r\n[ ] angular.io application / infrastructure changes\r\n[ ] Other... Please describe:\r\n```",
+  "created_at": "2017-08-16T13:11:04Z",
+  "updated_at": "2017-08-17T13:59:21Z",
+  "closed_at": null,
+  "merged_at": null,
+  "merge_commit_sha": "35f8a4fdd7b37d41d8ed71c0f9978ed3e751da43",
+  "assignee": null,
+  "assignees": [
+
+  ],
+  "requested_reviewers": [
+
+  ],
+  "milestone": null,
+  "commits_url": "https://api.github.com/repos/angular/angular/pulls/18730/commits",
+  "review_comments_url": "https://api.github.com/repos/angular/angular/pulls/18730/comments",
+  "review_comment_url": "https://api.github.com/repos/angular/angular/pulls/comments{/number}",
+  "comments_url": "https://api.github.com/repos/angular/angular/issues/18730/comments",
+  "statuses_url": "https://api.github.com/repos/angular/angular/statuses/d59a5eec6cc60e301033300957f0c959b8056650",
+  "head": {
+    "label": "cexbrayat:docs/metadata-guide",
+    "ref": "docs/metadata-guide",
+    "sha": "d59a5eec6cc60e301033300957f0c959b8056650",
+    "user": {
+      "login": "cexbrayat",
+      "id": 411874,
+      "avatar_url": "https://avatars3.githubusercontent.com/u/411874?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/cexbrayat",
+      "html_url": "https://github.com/cexbrayat",
+      "followers_url": "https://api.github.com/users/cexbrayat/followers",
+      "following_url": "https://api.github.com/users/cexbrayat/following{/other_user}",
+      "gists_url": "https://api.github.com/users/cexbrayat/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/cexbrayat/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/cexbrayat/subscriptions",
+      "organizations_url": "https://api.github.com/users/cexbrayat/orgs",
+      "repos_url": "https://api.github.com/users/cexbrayat/repos",
+      "events_url": "https://api.github.com/users/cexbrayat/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/cexbrayat/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "repo": {
+      "id": 25485740,
+      "name": "angular",
+      "full_name": "cexbrayat/angular",
+      "owner": {
+        "login": "cexbrayat",
+        "id": 411874,
+        "avatar_url": "https://avatars3.githubusercontent.com/u/411874?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/cexbrayat",
+        "html_url": "https://github.com/cexbrayat",
+        "followers_url": "https://api.github.com/users/cexbrayat/followers",
+        "following_url": "https://api.github.com/users/cexbrayat/following{/other_user}",
+        "gists_url": "https://api.github.com/users/cexbrayat/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/cexbrayat/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/cexbrayat/subscriptions",
+        "organizations_url": "https://api.github.com/users/cexbrayat/orgs",
+        "repos_url": "https://api.github.com/users/cexbrayat/repos",
+        "events_url": "https://api.github.com/users/cexbrayat/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/cexbrayat/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      "private": false,
+      "html_url": "https://github.com/cexbrayat/angular",
+      "description": null,
+      "fork": true,
+      "url": "https://api.github.com/repos/cexbrayat/angular",
+      "forks_url": "https://api.github.com/repos/cexbrayat/angular/forks",
+      "keys_url": "https://api.github.com/repos/cexbrayat/angular/keys{/key_id}",
+      "collaborators_url": "https://api.github.com/repos/cexbrayat/angular/collaborators{/collaborator}",
+      "teams_url": "https://api.github.com/repos/cexbrayat/angular/teams",
+      "hooks_url": "https://api.github.com/repos/cexbrayat/angular/hooks",
+      "issue_events_url": "https://api.github.com/repos/cexbrayat/angular/issues/events{/number}",
+      "events_url": "https://api.github.com/repos/cexbrayat/angular/events",
+      "assignees_url": "https://api.github.com/repos/cexbrayat/angular/assignees{/user}",
+      "branches_url": "https://api.github.com/repos/cexbrayat/angular/branches{/branch}",
+      "tags_url": "https://api.github.com/repos/cexbrayat/angular/tags",
+      "blobs_url": "https://api.github.com/repos/cexbrayat/angular/git/blobs{/sha}",
+      "git_tags_url": "https://api.github.com/repos/cexbrayat/angular/git/tags{/sha}",
+      "git_refs_url": "https://api.github.com/repos/cexbrayat/angular/git/refs{/sha}",
+      "trees_url": "https://api.github.com/repos/cexbrayat/angular/git/trees{/sha}",
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