context: introduce p[12]copies() methods and debugp[12]copies commands
As mentioned earlier, I'm working on support for storing copy metadata
in the changeset instead of in the filelog.
In order to transition a repo from storing metadata in filelogs to
storing it in the changeset, I'm going to provide a config option for
reading the metadata from the changeset, but falling back to getting
it from the filelog if it's not in the changeset. In this compatiblity
mode, the changeset-optmized algorithms will be used. We will then
need to convert the filelog copy metadata to look like that provided
by changeset copy metadata. This patch introduces methods that do just
that.
By having these methods here, we can start writing changeset-optimized
algorithms that should work already before we add any support for
storing the metadata in the changesets.
This commit also includes new debugp[12]copies commands and exercises
them in test-copies.t.
Differential Revision: https://phab.mercurial-scm.org/D5990
# loggingutil.py - utility for logging events
#
# 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.
from __future__ import absolute_import
import errno
from . import (
pycompat,
)
from .utils import (
dateutil,
procutil,
stringutil,
)
def openlogfile(ui, vfs, name, maxfiles=0, maxsize=0):
"""Open log file in append mode, with optional rotation
If maxsize > 0, the log file will be rotated up to maxfiles.
"""
def rotate(oldpath, newpath):
try:
vfs.unlink(newpath)
except OSError as err:
if err.errno != errno.ENOENT:
ui.debug("warning: cannot remove '%s': %s\n" %
(newpath, err.strerror))
try:
if newpath:
vfs.rename(oldpath, newpath)
except OSError as err:
if err.errno != errno.ENOENT:
ui.debug("warning: cannot rename '%s' to '%s': %s\n" %
(newpath, oldpath, err.strerror))
if maxsize > 0:
try:
st = vfs.stat(name)
except OSError:
pass
else:
if st.st_size >= maxsize:
path = vfs.join(name)
for i in pycompat.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')
return vfs(name, 'a', makeparentdirs=False)
def _formatlogline(msg):
date = dateutil.datestr(format=b'%Y/%m/%d %H:%M:%S')
pid = procutil.getpid()
return b'%s (%d)> %s' % (date, pid, msg)
def _matchevent(event, tracked):
return b'*' in tracked or event in tracked
class filelogger(object):
"""Basic logger backed by physical file with optional rotation"""
def __init__(self, vfs, name, tracked, maxfiles=0, maxsize=0):
self._vfs = vfs
self._name = name
self._trackedevents = set(tracked)
self._maxfiles = maxfiles
self._maxsize = maxsize
def tracked(self, event):
return _matchevent(event, self._trackedevents)
def log(self, ui, event, msg, opts):
line = _formatlogline(msg)
try:
with openlogfile(ui, self._vfs, self._name,
maxfiles=self._maxfiles,
maxsize=self._maxsize) as fp:
fp.write(line)
except IOError as err:
ui.debug(b'cannot write to %s: %s\n'
% (self._name, stringutil.forcebytestr(err)))
class fileobjectlogger(object):
"""Basic logger backed by file-like object"""
def __init__(self, fp, tracked):
self._fp = fp
self._trackedevents = set(tracked)
def tracked(self, event):
return _matchevent(event, self._trackedevents)
def log(self, ui, event, msg, opts):
line = _formatlogline(msg)
try:
self._fp.write(line)
self._fp.flush()
except IOError as err:
ui.debug(b'cannot write to %s: %s\n'
% (stringutil.forcebytestr(self._fp.name),
stringutil.forcebytestr(err)))
class proxylogger(object):
"""Forward log events to another logger to be set later"""
def __init__(self):
self.logger = None
def tracked(self, event):
return self.logger is not None and self.logger.tracked(event)
def log(self, ui, event, msg, opts):
assert self.logger is not None
self.logger.log(ui, event, msg, opts)