# blackbox.py - log repository events to a file for post-mortem debugging
#
# Copyright 2010 Nicolas Dumazet
# Copyright 2013 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""log repository events to a blackbox for debugging
Logs event information to .hg/blackbox.log to help debug and diagnose problems.
The events that get logged can be configured via the blackbox.track config key.
Examples::
[blackbox]
track = *
# dirty is *EXPENSIVE* (slow);
# each log entry indicates `+` if the repository is dirty, like :hg:`id`.
dirty = True
# record the source of log messages
logsource = True
[blackbox]
track = command, commandfinish, commandexception, exthook, pythonhook
[blackbox]
track = incoming
[blackbox]
# limit the size of a log file
maxsize = 1.5 MB
# rotate up to N log files when the current one gets too big
maxfiles = 3
"""
from __future__ import absolute_import
import errno
import re
from mercurial.i18n import _
from mercurial.node import hex
from mercurial import (
cmdutil,
ui as uimod,
util,
)
cmdtable = {}
command = cmdutil.command(cmdtable)
# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'
lastui = None
filehandles = {}
def _openlog(vfs):
path = vfs.join('blackbox.log')
if path in filehandles:
return filehandles[path]
filehandles[path] = fp = vfs('blackbox.log', 'a')
return fp
def _closelog(vfs):
path = vfs.join('blackbox.log')
fp = filehandles[path]
del filehandles[path]
fp.close()
def wrapui(ui):
class blackboxui(ui.__class__):
def __init__(self, src=None):
super(blackboxui, self).__init__(src)
if src is None:
self._partialinit()
else:
self._bbfp = getattr(src, '_bbfp', None)
self._bbinlog = False
self._bbrepo = getattr(src, '_bbrepo', None)
self._bbvfs = getattr(src, '_bbvfs', None)
def _partialinit(self):
if util.safehasattr(self, '_bbvfs'):
return
self._bbfp = None
self._bbinlog = False
self._bbrepo = None
self._bbvfs = None
def copy(self):
self._partialinit()
return self.__class__(self)
@util.propertycache
def track(self):
return self.configlist('blackbox', 'track', ['*'])
def _openlogfile(self):
def rotate(oldpath, newpath):
try:
self._bbvfs.unlink(newpath)
except OSError as err:
if err.errno != errno.ENOENT:
self.debug("warning: cannot remove '%s': %s\n" %
(newpath, err.strerror))
try:
if newpath:
self._bbvfs.rename(oldpath, newpath)
except OSError as err:
if err.errno != errno.ENOENT:
self.debug("warning: cannot rename '%s' to '%s': %s\n" %
(newpath, oldpath, err.strerror))
fp = _openlog(self._bbvfs)
maxsize = self.configbytes('blackbox', 'maxsize', 1048576)
if maxsize > 0:
st = self._bbvfs.fstat(fp)
if st.st_size >= maxsize:
path = fp.name
_closelog(self._bbvfs)
maxfiles = self.configint('blackbox', 'maxfiles', 7)
for i in xrange(maxfiles - 1, 1, -1):
rotate(oldpath='%s.%d' % (path, i - 1),
newpath='%s.%d' % (path, i))
rotate(oldpath=path,
newpath=maxfiles > 0 and path + '.1')
fp = _openlog(self._bbvfs)
return fp
def _bbwrite(self, fmt, *args):
self._bbfp.write(fmt % args)
self._bbfp.flush()
def log(self, event, *msg, **opts):
global lastui
super(blackboxui, self).log(event, *msg, **opts)
self._partialinit()
if not '*' in self.track and not event in self.track:
return
if self._bbfp:
ui = self
elif self._bbvfs:
try:
self._bbfp = self._openlogfile()
except (IOError, OSError) as err:
self.debug('warning: cannot write to blackbox.log: %s\n' %
err.strerror)
del self._bbvfs
self._bbfp = None
ui = self
else:
# certain ui instances exist outside the context of
# a repo, so just default to the last blackbox that
# was seen.
ui = lastui
if not ui or not ui._bbfp:
return
if not lastui or ui._bbrepo:
lastui = ui
if ui._bbinlog:
# recursion guard
return
try:
ui._bbinlog = True
date = util.datestr(None, '%Y/%m/%d %H:%M:%S')
user = util.getuser()
pid = str(util.getpid())
formattedmsg = msg[0] % msg[1:]
rev = '(unknown)'
changed = ''
if ui._bbrepo:
ctx = ui._bbrepo[None]
parents = ctx.parents()
rev = ('+'.join([hex(p.node()) for p in parents]))
if (ui.configbool('blackbox', 'dirty', False) and (
any(ui._bbrepo.status()) or
any(ctx.sub(s).dirty() for s in ctx.substate)
)):
changed = '+'
if ui.configbool('blackbox', 'logsource', False):
src = ' [%s]' % event
else:
src = ''
try:
ui._bbwrite('%s %s @%s%s (%s)%s> %s',
date, user, rev, changed, pid, src, formattedmsg)
except IOError as err:
self.debug('warning: cannot write to blackbox.log: %s\n' %
err.strerror)
finally:
ui._bbinlog = False
def setrepo(self, repo):
self._bbfp = None
self._bbinlog = False
self._bbrepo = repo
self._bbvfs = repo.vfs
ui.__class__ = blackboxui
uimod.ui = blackboxui
def uisetup(ui):
wrapui(ui)
def reposetup(ui, repo):
# During 'hg pull' a httppeer repo is created to represent the remote repo.
# It doesn't have a .hg directory to put a blackbox in, so we don't do
# the blackbox setup for it.
if not repo.local():
return
if util.safehasattr(ui, 'setrepo'):
ui.setrepo(repo)
@command('^blackbox',
[('l', 'limit', 10, _('the number of events to show')),
],
_('hg blackbox [OPTION]...'))
def blackbox(ui, repo, *revs, **opts):
'''view the recent repository events
'''
if not repo.vfs.exists('blackbox.log'):
return
limit = opts.get('limit')
fp = repo.vfs('blackbox.log', 'r')
lines = fp.read().split('\n')
count = 0
output = []
for line in reversed(lines):
if count >= limit:
break
# count the commands by matching lines like: 2013/01/23 19:13:36 root>
if re.match('^\d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2} .*> .*', line):
count += 1
output.append(line)
ui.status('\n'.join(reversed(output)))