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-rwxr-xr-xscripts/environment.js24
1 files changed, 24 insertions, 0 deletions
diff --git a/scripts/environment.js b/scripts/environment.js
new file mode 100755
index 0000000000..b071a484e7
--- /dev/null
+++ b/scripts/environment.js
@@ -0,0 +1,24 @@
+#!/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'];
+if (pr) {
+ const number = +pr.match(/\/(\d+)\/?$/)[1];
+ return github.pullRequests.get({
+ owner: 'mapbox',
+ repo: 'mapbox-gl-native',
+ number
+ }).then(({data}) => {
+ const base = data.base.ref;
+ const head = process.env['CIRCLE_SHA1'];
+ const mergeBase = execSync(`git merge-base origin/${base} ${head}`).toString().trim();
+
+ console.log(`export CIRCLE_TARGET_BRANCH=${base}`);
+ console.log(`export CIRCLE_MERGE_BASE=${mergeBase}`);
+ });
+}