Update Entropy Beauty scan to match 4.x

Contains all the python and repo reference fixes

Author: akarnokd

.github/workflows/compute-entropy.py

@@ -1,64 +1,81 @@
-#!/usr/bin/env python3
-import sys, math, json, subprocess
-from collections import Counter
-from pathlib import Path
-
-def shannon_entropy(text: str) -> float:
-    if not text or len(text) < 10:
-        return 0.0
-    freq = Counter(text)
-    probs = [count / len(text) for count in freq.values()]
-    return -sum(p * math.log2(p) for p in probs if p > 0)
-
-# Get changed files safely for pull_request events
-changed_files = []
-try:
-    # GitHub provides github.event.pull_request.base.sha and head.sha in the context
-    base_sha = subprocess.check_output(['git', 'rev-parse', 'origin/${{ github.base_ref }}'], text=True).strip()
-    changed_files = subprocess.check_output(
-        ['git', 'diff', '--name-only', base_sha, 'HEAD'], text=True
-    ).splitlines()
-except subprocess.CalledProcessError:
-    # Fallback for first-time PRs or edge cases: use the merge-base or just files in HEAD
-    try:
-        changed_files = subprocess.check_output(
-            ['git', 'diff', '--name-only', 'HEAD~1', 'HEAD'], text=True
-        ).splitlines()
-    except subprocess.CalledProcessError:
-        # Last resort: all files in the repo
-        changed_files = subprocess.check_output(['git', 'ls-files'], text=True).splitlines()
-
-results = []
-total_ent = 0.0
-count = 0
-
-for f in changed_files:
-    path = Path(f.strip())
-    if not path.exists() or path.suffix in {'.png', '.jpg', '.gif', '.bin', '.lock', '.exe', '.dll', '.so'}:
-        continue
-    try:
-        content = path.read_text(encoding='utf-8', errors='ignore')
-        ent = shannon_entropy(content)
-        results.append(f"{f}: {ent:.3f}")
-        total_ent += ent
-        count += 1
-    except Exception:
-        pass
-
-avg = round(total_ent / count, 3) if count > 0 else 0.0
-
-verdict = (
-    "✅ Mid-4 beauty detected (thoughtful human code!)" if 4.3 <= avg <= 4.7 else
-    "⚠️ Consider review — entropy outside sweet spot" if avg > 0 else
-    "No source files changed"
-)
-
-with open('/tmp/beauty.json', 'w') as f:
-    json.dump({
-        "average_entropy": avg,
-        "verdict": verdict,
-        "files": results[:20]
-    }, f, indent=2)
-
-print(f"Average entropy: {avg}")
-print(verdict)
+#!/usr/bin/env python3
+import os
+import sys
+import math
+import json
+import subprocess
+from collections import Counter
+from pathlib import Path
+
+def shannon_entropy(text: str) -> float:
+    if not text or len(text) < 10:
+        return 0.0
+    freq = Counter(text)
+    probs = [count / len(text) for count in freq.values()]
+    return -sum(p * math.log2(p) for p in probs if p > 0)
+
+# Determine changed files based on event type
+changed_files = []
+event_name = os.environ.get("EVENT_NAME", "")
+base_sha = os.environ.get("BASE_SHA", "").strip()
+head_sha = os.environ.get("HEAD_SHA", "").strip() or "HEAD"
+
+try:
+    if event_name == "pull_request_target" and base_sha:
+        # PR case: we checked out the PR head and fetched the base commit
+        changed_files = subprocess.check_output(
+            ["git", "diff", "--name-only", base_sha, head_sha],
+            text=True
+        ).splitlines()
+    else:
+        # push / release: diff against previous commit
+        changed_files = subprocess.check_output(
+            ["git", "diff", "--name-only", "HEAD~1", "HEAD"],
+            text=True
+        ).splitlines()
+except subprocess.CalledProcessError:
+    # Fallbacks
+    try:
+        changed_files = subprocess.check_output(
+            ["git", "diff", "--name-only", "HEAD~1", "HEAD"],
+            text=True
+        ).splitlines()
+    except subprocess.CalledProcessError:
+        changed_files = subprocess.check_output(
+            ["git", "ls-files"], text=True
+        ).splitlines()
+
+results = []
+total_ent = 0.0
+count = 0
+
+for f in changed_files:
+    path = Path(f.strip())
+    if not path.exists() or path.suffix in {'.png', '.jpg', '.gif', '.bin', '.lock', '.exe', '.dll', '.so'}:
+        continue
+    try:
+        content = path.read_text(encoding="utf-8", errors="ignore")
+        ent = shannon_entropy(content)
+        results.append(f"{f}: {ent:.3f}")
+        total_ent += ent
+        count += 1
+    except Exception:
+        pass
+
+avg = round(total_ent / count, 3) if count > 0 else 0.0
+
+verdict = (
+    "✅ Mid-4 beauty detected (thoughtful human code!)" if 4.3 <= avg <= 4.7 else
+    "⚠️ Consider review — entropy outside sweet spot" if avg > 0 else
+    "No source files changed"
+)
+
+with open("/tmp/beauty.json", "w") as f:
+    json.dump({
+        "average_entropy": avg,
+        "verdict": verdict,
+        "files": results[:20]
+    }, f, indent=2)
+
+print(f"Average entropy: {avg}")
+print(verdict)