dmesg differ

scripts/diff_dmesg.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+
+import os
+import re
+import argparse
+
+RED = '\033[91m'
+GREEN = '\033[92m'
+YELLOW = '\033[93m'
+ENDC = '\033[0m'
+
+def split_line(l):
+  try:
+    parts = l.split('] ')
+    ts = float(parts[0][1:])
+    line = '] '.join(parts[1:])
+    return ts, line
+  except ValueError:
+    return None, l
+
+def find_matching_idx(lines, line, disable_known_mismatches):
+  def cleanup(l):
+    if disable_known_mismatches:
+      return l
+
+    if 'wlan:' in l:
+      l = re.sub(r'\[\d+\]', '', l)
+      l = re.sub(r'\[\d+:\d+:\d+\.\d+\]', '', l)
+      l = re.sub(r'\[\d+:', '', l)
+      l = re.sub(r'\[kworker/u16:\d', '', l)
+
+    return l
+
+  for i, l in enumerate(lines):
+    if cleanup(line) in cleanup(l):
+      return i
+  return None
+
+def print_columns(l1, l2):
+  c1 = RED if len(l2) == 0 else ENDC
+  c2 = GREEN if len(l1) == 0 else ENDC
+
+  col_width = (os.get_terminal_size().columns // 2) - 4
+  print(f"{c1}{l1[:col_width]:<{col_width}} {YELLOW}|{ENDC} {c2}{l2[:col_width]:<{col_width}}{ENDC}")
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser(description='Compare two dmesg files')
+  parser.add_argument('file1', help='first dmesg file')
+  parser.add_argument('file2', help='second dmesg file')
+  parser.add_argument('--only-diff', action='store_true', help='only show lines that differ')
+  parser.add_argument('--disable-known-mismatches', action='store_true', help='disable known mismatches (such as timestamps in messages)')
+  args = parser.parse_args()
+
+  with open(args.file1) as f1, open(args.file2) as f2:
+    lines1 = f1.readlines()
+    lines2 = f2.readlines()
+
+  while len(lines1) > 0 and len(lines2) > 0:
+    ts1, line1 = split_line(lines1[0])
+    ts2, line2 = split_line(lines2[0])
+
+    if ts1 is None:
+      print_columns(lines1[0].strip(), "")
+      lines1.pop(0)
+    elif ts2 is None:
+      print_columns(lines2[0].strip(), "")
+      lines2.pop(0)
+    elif ts1 <= ts2:
+      idx = find_matching_idx(lines2, line1, args.disable_known_mismatches)
+      if idx is not None:
+        if not args.only_diff:
+          print_columns(lines1[0].strip(), lines2[idx].strip())
+        lines1.pop(0)
+        lines2.pop(idx)
+      else:
+        print_columns(lines1[0].strip(), "")
+        lines1.pop(0)
+    else:
+      idx = find_matching_idx(lines1, line2, args.disable_known_mismatches)
+      if idx is not None:
+        if not args.only_diff:
+          print_columns(lines1[idx].strip(), lines2[0].strip())
+        lines1.pop(idx)
+        lines2.pop(0)
+      else:
+        print_columns("", lines2[0].strip())
+        lines2.pop(0)