Add step to GnuTest workflow to compare results against master

.github/workflows/GnuTests.yml

@@ -90,3 +90,16 @@ jobs:
       with:
         name: gnu-result
         path: gnu-result.json
+    - name: Download the result
+      uses: dawidd6/action-download-artifact@v2
+      with:
+        workflow: GnuTests.yml
+        name: gnu-result
+        repo: uutils/coreutils
+        branch: master
+        path: dl
+    - name: Compare against master results
+      shell: bash
+      run: |
+        mv dl/gnu-result.json master-gnu-result.json
+        python uutils/util/compare_gnu_result.py

util/compare_gnu_result.py

@@ -0,0 +1,32 @@
+#! /usr/bin/python
+
+"""
+Compare the current results to the last results gathered from the master branch to highlight
+if a PR is making the results better/worse
+"""
+
+import json
+import sys
+from os import environ
+
+NEW = json.load(open("gnu-result.json"))
+OLD = json.load(open("master-gnu-result.json"))
+
+# Extract the specific results from the dicts
+last = OLD[list(OLD.keys())[0]]
+current = NEW[list(NEW.keys())[0]]
+
+
+pass_d = int(current["pass"]) - int(last["pass"])
+fail_d = int(current["fail"]) - int(last["fail"])
+error_d = int(current["error"]) - int(last["error"])
+skip_d = int(current["skip"]) - int(last["skip"])
+
+# Get an annotation to highlight changes
+print(
+    f"::warning ::Changes from master: PASS {pass_d:+d} / FAIL {fail_d:+d} / ERROR {error_d:+d} / SKIP {skip_d:+d} "
+)
+
+# If results are worse fail the job to draw attention
+if pass_d < 0:
+    sys.exit(1)