Initial commit

skills/root-cause-tracing/find-polluter.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+# Bisection script to find which test creates unwanted files/state
+# Usage: ./find-polluter.sh <file_or_dir_to_check> <test_pattern>
+# Example: ./find-polluter.sh '.git' 'src/**/*.test.ts'
+
+set -e
+
+if [ $# -ne 2 ]; then
+  echo "Usage: $0 <file_to_check> <test_pattern>"
+  echo "Example: $0 '.git' 'src/**/*.test.ts'"
+  exit 1
+fi
+
+POLLUTION_CHECK="$1"
+TEST_PATTERN="$2"
+
+echo "🔍 Searching for test that creates: $POLLUTION_CHECK"
+echo "Test pattern: $TEST_PATTERN"
+echo ""
+
+# Get list of test files
+# Extract filename pattern from glob (e.g., "src/**/*.test.ts" -> "*.test.ts")
+# Note: -name only matches the filename, not full path. For complex path patterns,
+# consider using: find . -type f -name "*.test.ts" | grep -E "src/.*"
+FILENAME_PATTERN="${TEST_PATTERN##*/}"
+TEST_FILES=$(find . -type f -name "$FILENAME_PATTERN" 2>/dev/null | sort)
+
+if [ -z "$TEST_FILES" ]; then
+  echo "No test files found matching pattern: $TEST_PATTERN"
+  echo "Filename pattern extracted: $FILENAME_PATTERN"
+  exit 1
+fi
+
+TOTAL=$(echo "$TEST_FILES" | wc -l | tr -d ' ')
+
+echo "Found $TOTAL test files"
+echo ""
+
+COUNT=0
+while IFS= read -r TEST_FILE; do
+  COUNT=$((COUNT + 1))
+
+  # Skip if pollution already exists
+  if [ -e "$POLLUTION_CHECK" ]; then
+    echo "⚠️  Pollution already exists before test $COUNT/$TOTAL"
+    echo "   Skipping: $TEST_FILE"
+    continue
+  fi
+
+  echo "[$COUNT/$TOTAL] Testing: $TEST_FILE"
+
+  # Run the test
+  npm test "$TEST_FILE" > /dev/null 2>&1 || true
+
+  # Check if pollution appeared
+  if [ -e "$POLLUTION_CHECK" ]; then
+    echo ""
+    echo "🎯 FOUND POLLUTER!"
+    echo "   Test: $TEST_FILE"
+    echo "   Created: $POLLUTION_CHECK"
+    echo ""
+    echo "Pollution details:"
+    ls -la "$POLLUTION_CHECK"
+    echo ""
+    echo "To investigate:"
+    echo "  npm test $TEST_FILE    # Run just this test"
+    echo "  cat $TEST_FILE         # Review test code"
+    exit 1
+  fi
+done <<< "$TEST_FILES"
+
+echo ""
+echo "✅ No polluter found - all tests clean!"
+exit 0