From de91a963fc7210e8bcc6e0856f2e1a0c92bab61d Mon Sep 17 00:00:00 2001
From: Matthias Wachs <wachs@net.in.tum.de>
Date: Tue, 22 Jan 2013 11:04:05 +0000
Subject: print dmesg messages with human readable timestamps useful to check
 when segfaults etc happened

---
 contrib/pydmesg | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100755 contrib/pydmesg

(limited to 'contrib')

diff --git a/contrib/pydmesg b/contrib/pydmesg
new file mode 100755
index 000000000..d60e08fe3
--- /dev/null
+++ b/contrib/pydmesg
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+# coding=utf8
+
+# Copyright (C) 2010 Saúl ibarra Corretgé <saghul@gmail.com>
+#
+
+"""
+pydmesg: dmesg with human-readable timestamps
+"""
+
+from __future__ import with_statement
+
+import re
+import subprocess
+import sys
+
+from datetime import datetime, timedelta
+
+
+_datetime_format = "%Y-%m-%d %H:%M:%S"
+_dmesg_line_regex = re.compile("^\[(?P<time>\d+\.\d+)\](?P<line>.*)$")
+
+def exec_process(cmdline, silent, input=None, **kwargs):
+    """Execute a subprocess and returns the returncode, stdout buffer and stderr buffer.
+       Optionally prints stdout and stderr while running."""
+    try:
+        sub = subprocess.Popen(cmdline, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, **kwargs)
+        stdout, stderr = sub.communicate(input=input)
+        returncode = sub.returncode
+        if not silent:
+            sys.stdout.write(stdout)
+            sys.stderr.write(stderr)
+    except OSError,e:
+        if e.errno == 2:
+            raise RuntimeError('"%s" is not present on this system' % cmdline[0])
+        else:
+            raise
+    if returncode != 0:
+        raise RuntimeError('Got return value %d while executing "%s", stderr output was:\n%s' % (returncode, " ".join(cmdline), stderr.rstrip("\n")))
+    return stdout
+
+def human_dmesg():
+    now = datetime.now()
+    uptime_diff = None
+    try:
+        with open('/proc/uptime') as f:
+            uptime_diff = f.read().strip().split()[0]
+    except IndexError:
+        return
+    else:
+        try:
+            uptime = now - timedelta(seconds=int(uptime_diff.split('.')[0]), microseconds=int(uptime_diff.split('.')[1]))
+        except IndexError:
+            return
+
+    dmesg_data = exec_process(['dmesg'], True)
+    for line in dmesg_data.split('\n'):
+        if not line:
+            continue
+        match = _dmesg_line_regex.match(line)
+        if match:
+            try:
+                seconds = int(match.groupdict().get('time', '').split('.')[0])
+                nanoseconds = int(match.groupdict().get('time', '').split('.')[1])
+                microseconds = int(round(nanoseconds * 0.001))
+                line = match.groupdict().get('line', '')
+                t = uptime + timedelta(seconds=seconds, microseconds=microseconds)
+            except IndexError:
+                pass
+            else:
+                print "[%s]%s" % (t.strftime(_datetime_format), line)
+
+
+if __name__ == '__main__':
+    human_dmesg()
-- 
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