From 583c79488bc15e8c4d4b2b152c5d7a258be02d02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Tue, 25 Sep 2018 13:14:27 +0200
Subject: [build] compare clang-tidy with merge base instead of master

---
 circle.yml             | 14 +++++++++++---
 package.json           |  1 +
 scripts/clang-tools.sh |  5 +++--
 scripts/environment.js | 34 ++++++++++++++++++++++++++++++++++
 4 files changed, 49 insertions(+), 5 deletions(-)
 create mode 100755 scripts/environment.js

diff --git a/circle.yml b/circle.yml
index e7e348635f..0e89074bfb 100644
--- a/circle.yml
+++ b/circle.yml
@@ -52,6 +52,15 @@ workflows:
               only: /node-.*/
 
 step-library:
+  - &npm-install
+      run:
+        name: npm install
+        command: npm install --ignore-scripts
+  - &prepare-environment
+      run:
+        name: Prepare environment
+        command: touch "$BASH_ENV" && ./scripts/environment.js | tee -a "$BASH_ENV"
+
   - &generate-cache-key
       run:
         name: Generate cache key
@@ -285,12 +294,11 @@ jobs:
       BUILDTYPE: Debug
     steps:
       - checkout
+      - *npm-install
+      - *prepare-environment
       - *generate-cache-key
       - *restore-cache
       - *reset-ccache-stats
-      - run:
-          name: Fetch 'origin/master' branch
-          command: git fetch origin master:refs/remotes/origin/master
       - run:
           name: Generate compilation database
           command: make compdb
diff --git a/package.json b/package.json
index 208d4e4c4a..632110660f 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "npm-run-all": "^4.0.2"
   },
   "devDependencies": {
+    "@octokit/rest": "^15.9.2",
     "aws-sdk": "^2.3.5",
     "csscolorparser": "^1.0.2",
     "ejs": "^2.4.1",
diff --git a/scripts/clang-tools.sh b/scripts/clang-tools.sh
index bdda4544b9..735c758d64 100755
--- a/scripts/clang-tools.sh
+++ b/scripts/clang-tools.sh
@@ -2,6 +2,7 @@
 
 set -e
 set -o pipefail
+set -u
 
 CLANG_TIDY_PREFIX=${CLANG_TIDY_PREFIX:-$(scripts/mason.sh PREFIX clang-tidy VERSION 4.0.1)}
 CLANG_TIDY=${CLANG_TIDY:-${CLANG_TIDY_PREFIX}/bin/clang-tidy}
@@ -33,7 +34,7 @@ function run_clang_tidy() {
 }
 
 function run_clang_tidy_diff() {
-    OUTPUT=$(git diff origin/master --src-prefix=${CDUP} --dst-prefix=${CDUP} | \
+    OUTPUT=$(git diff ${CIRCLE_MERGE_BASE} --src-prefix=${CDUP} --dst-prefix=${CDUP} | \
                 ${CLANG_TIDY_PREFIX}/share/clang-tidy-diff.py \
                     -clang-tidy-binary ${CLANG_TIDY} \
                     2>/dev/null)
@@ -45,7 +46,7 @@ function run_clang_tidy_diff() {
 
 function run_clang_format() {
     echo "Running clang-format on $0..."
-    DIFF_FILES=$(git diff origin/master --name-only *cpp)
+    DIFF_FILES=$(git diff ${CIRCLE_MERGE_BASE} --name-only *cpp)
     echo "${DIFF_FILES}" | xargs -I{} -P ${JOBS} bash -c 'run_clang_format' {}
     ${CLANG_FORMAT} -i ${CDUP}/$0 || exit 1
 }
diff --git a/scripts/environment.js b/scripts/environment.js
new file mode 100755
index 0000000000..cb533a74a8
--- /dev/null
+++ b/scripts/environment.js
@@ -0,0 +1,34 @@
+#!/usr/bin/env node
+
+// Output some `export` commands with a few extra environment variables. They'll be evaluated
+// into the build environment and available for use in later steps.
+
+const github = require('@octokit/rest')();
+const {execSync} = require('child_process');
+
+const pr = process.env['CIRCLE_PULL_REQUEST'];
+const head = process.env['CIRCLE_SHA1'] || 'HEAD';
+if (pr) {
+    const number = +pr.match(/\/(\d+)\/?$/)[1];
+    return github.pullRequests.get({
+        owner: 'mapbox',
+        repo: 'mapbox-gl-native',
+        number
+    }).then(({data}) => {
+        const base = data.base.ref;
+        const mergeBase = execSync(`git merge-base origin/${base} ${head}`).toString().trim();
+
+        console.log(`export CIRCLE_TARGET_BRANCH=${base}`);
+        console.log(`export CIRCLE_MERGE_BASE=${mergeBase}`);
+    });
+} else {
+    for (const sha of execSync(`git rev-list --max-count=10 ${head}`).toString().trim().split('\n')) {
+        const base = execSync(`git branch -r --contains ${sha} origin/master origin/release-*`).toString().split('\n')[0].trim().replace(/^origin\//, '');
+        if (base.match(/^(master|release-[a-z]+)$/)) {
+            const mergeBase = execSync(`git merge-base origin/${base} ${head}`).toString().trim();
+            console.log(`export CIRCLE_TARGET_BRANCH=${base}`);
+            console.log(`export CIRCLE_MERGE_BASE=${mergeBase}`);
+            break;
+        }
+    }
+}
-- 
cgit v1.2.1