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dirstate: ignore symlinks when fs cannot handle them (issue1888)...
dirstate: ignore symlinks when fs cannot handle them (issue1888) When the filesystem cannot handle the executable bit, we currently ignore it completely when looking for modified files. Similarly, it is impossible to set or clear the bit when the filesystem ignores it. This patch makes Mercurial treat symbolic links the same way. Symlinks are a little different since they manifest themselves as small files containing a filename (the symlink target). On Windows, these files show up as regular files, and on Linux and Mac they show up as real symlinks. Issue1888 presents a case where the symlink files are better ignored from the Windows side. A Linux client creates symlinks in a working copy which is shared over a network between Linux and Windows clients. The Samba server is helpful and defererences the symlink when the Windows client looks at it. This means that Mercurial on the Windows side sees file content instead of a file name in the symlink, and hence flags the link as modified. Ignoring the change would be much more helpful, similarly to how Mercurial does not report any changes when executable bits are ignored in a checkout on Windows. An initial checkout of a symbolic link on a file system that cannot handle symbolic links will still result in a regular file containing the target file name as its content. Sharing such a checkout with a Linux client will not turn the file into a symlink automatically, but 'hg revert' can fix that. After the revert, the Windows client will see the correct file content (provided by the Samba server when it follows the link on the Linux side) and otherwise ignore the change. Running 'hg perfstatus' 10 times gives these results: Before: After: min: 0.544703 min: 0.546549 med: 0.547592 med: 0.548881 avg: 0.549146 avg: 0.548549 max: 0.564112 max: 0.551504 The median time is increased about 0.24%.

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streamclone.py
69 lines | 2.2 KiB | text/x-python | PythonLexer
# streamclone.py - streaming clone server support for mercurial
#
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import util, error
from mercurial import store
class StreamException(Exception):
def __init__(self, code):
Exception.__init__(self)
self.code = code
def __str__(self):
return '%i\n' % self.code
# if server supports streaming clone, it advertises "stream"
# capability with value that is version+flags of repo it is serving.
# client only streams if it can read that repo format.
# stream file format is simple.
#
# server writes out line that says how many files, how many total
# bytes. separator is ascii space, byte counts are strings.
#
# then for each file:
#
# server writes out line that says filename, how many bytes in
# file. separator is ascii nul, byte count is string.
#
# server writes out raw file data.
def allowed(ui):
return ui.configbool('server', 'uncompressed', True, untrusted=True)
def stream_out(repo):
'''stream out all metadata files in repository.
writes to file-like object, must support write() and optional flush().'''
if not allowed(repo.ui):
raise StreamException(1)
entries = []
total_bytes = 0
try:
# get consistent snapshot of repo, lock during scan
lock = repo.lock()
try:
repo.ui.debug('scanning\n')
for name, ename, size in repo.store.walk():
entries.append((name, size))
total_bytes += size
finally:
lock.release()
except error.LockError:
raise StreamException(2)
yield '0\n'
repo.ui.debug('%d files, %d bytes to transfer\n' %
(len(entries), total_bytes))
yield '%d %d\n' % (len(entries), total_bytes)
for name, size in entries:
repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
# partially encode name over the wire for backwards compat
yield '%s\0%d\n' % (store.encodedir(name), size)
for chunk in util.filechunkiter(repo.sopener(name), limit=size):
yield chunk