Lukas Eipert
--- a/bin/compare_reports.js
+++ b/bin/compare_reports.js
+    if (!fromCommit.parent_ids.includes(to.id)) {
+      throw new Error(
+        `Job ${args.job} ran on ${fromCommit.id}. ${to.id} is not a parent of that commit and should have been`
+      );
+    }
+
+    const masterCommitSHA = fromCommit.parent_ids.find((sha) => sha !== to.id);
+
+    console.warn(`Parent commit from master seems to be: ${masterCommitSHA}`);
+
+    from = await readFromSHA(masterCommitSHA);
+
+    if (args.html) {
+      const url = require("url");
+      fullReport = url.resolve(
+        jobInfo.web_url + "/artifacts/browse/",