Protocol switch from using generators to stream-like objects.
This allows the the pull side to precisely control how much data is
read so that another encapsulation layer is not needed.
An http client gets a response with a finite size. Because ssh clients
need to keep the stream open, we must not read more data than is sent
in a response. But due to the streaming nature of the changegroup
scheme, only the piece that's parsing the data knows how far it's
allowed to read.
This means the generator scheme isn't fine-grained enough. Instead we
need file-like objects with a read(x) method. This switches everything
for push/pull over to using file-like objects rather than generators.
# Copyright (C) 2005 by Intevation GmbH
# Author(s):
# Thomas Arendsen Hein <thomas@intevation.de>
#
# This program is free software under the GNU GPL (>=v2)
# Read the file COPYING coming with the software for details.
"""
Mercurial version
"""
import os
import os.path
import re
import time
import util
unknown_version = 'unknown'
remembered_version = False
def get_version():
"""Return version information if available."""
try:
from mercurial.__version__ import version
except ImportError:
version = unknown_version
return version
def write_version(version):
"""Overwrite version file."""
filename = os.path.join(os.path.dirname(__file__), '__version__.py')
f = open(filename, 'w')
f.write("# This file is auto-generated.\n")
f.write("version = %r\n" % version)
f.close()
def remember_version(version=None):
"""Store version information."""
global remembered_version
if not version and os.path.isdir(".hg"):
f = os.popen("hg identify 2> %s" % util.nulldev) # use real hg installation
ident = f.read()[:-1]
if not f.close() and ident:
ids = ident.split(' ', 1)
version = ids.pop(0)
if version[-1] == '+':
version = version[:-1]
modified = True
else:
modified = False
if version.isalnum() and ids:
for tag in ids[0].split('/'):
# is a tag is suitable as a version number?
if re.match(r'^(\d+\.)+[\w.-]+$', tag):
version = tag
break
if modified:
version += time.strftime('+%Y%m%d')
if version:
remembered_version = True
write_version(version)
def forget_version():
"""Remove version information."""
if remembered_version:
write_version(unknown_version)