ref: 04c4a9ca8b06e34a203f7ddacc2263cf2077e1aa
dir: /sys/src/cmd/hg/mercurial/statichttprepo.py/
# statichttprepo.py - simple http repository class for mercurial
#
# This provides read-only repo access to repositories exported via static http
#
# Copyright 2005-2007 Matt Mackall <[email protected]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
from i18n import _
import changelog, byterange, url, error
import localrepo, manifest, util, store
import urllib, urllib2, errno
class httprangereader(object):
def __init__(self, url, opener):
# we assume opener has HTTPRangeHandler
self.url = url
self.pos = 0
self.opener = opener
def seek(self, pos):
self.pos = pos
def read(self, bytes=None):
req = urllib2.Request(self.url)
end = ''
if bytes:
end = self.pos + bytes - 1
req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
try:
f = self.opener.open(req)
data = f.read()
if hasattr(f, 'getcode'):
# python 2.6+
code = f.getcode()
elif hasattr(f, 'code'):
# undocumented attribute, seems to be set in 2.4 and 2.5
code = f.code
else:
# Don't know how to check, hope for the best.
code = 206
except urllib2.HTTPError, inst:
num = inst.code == 404 and errno.ENOENT or None
raise IOError(num, inst)
except urllib2.URLError, inst:
raise IOError(None, inst.reason[1])
if code == 200:
# HTTPRangeHandler does nothing if remote does not support
# Range headers and returns the full entity. Let's slice it.
if bytes:
data = data[self.pos:self.pos + bytes]
else:
data = data[self.pos:]
elif bytes:
data = data[:bytes]
self.pos += len(data)
return data
def build_opener(ui, authinfo):
# urllib cannot handle URLs with embedded user or passwd
urlopener = url.opener(ui, authinfo)
urlopener.add_handler(byterange.HTTPRangeHandler())
def opener(base):
"""return a function that opens files over http"""
p = base
def o(path, mode="r"):
f = "/".join((p, urllib.quote(path)))
return httprangereader(f, urlopener)
return o
return opener
class statichttprepository(localrepo.localrepository):
def __init__(self, ui, path):
self._url = path
self.ui = ui
self.path, authinfo = url.getauthinfo(path.rstrip('/') + "/.hg")
opener = build_opener(ui, authinfo)
self.opener = opener(self.path)
# find requirements
try:
requirements = self.opener("requires").read().splitlines()
except IOError, inst:
if inst.errno != errno.ENOENT:
raise
# check if it is a non-empty old-style repository
try:
self.opener("00changelog.i").read(1)
except IOError, inst:
if inst.errno != errno.ENOENT:
raise
# we do not care about empty old-style repositories here
msg = _("'%s' does not appear to be an hg repository") % path
raise error.RepoError(msg)
requirements = []
# check them
for r in requirements:
if r not in self.supported:
raise error.RepoError(_("requirement '%s' not supported") % r)
# setup store
def pjoin(a, b):
return a + '/' + b
self.store = store.store(requirements, self.path, opener, pjoin)
self.spath = self.store.path
self.sopener = self.store.opener
self.sjoin = self.store.join
self.manifest = manifest.manifest(self.sopener)
self.changelog = changelog.changelog(self.sopener)
self._tags = None
self.nodetagscache = None
self.encodepats = None
self.decodepats = None
def url(self):
return self._url
def local(self):
return False
def lock(self, wait=True):
raise util.Abort(_('cannot lock static-http repository'))
def instance(ui, path, create):
if create:
raise util.Abort(_('cannot create new static-http repository'))
return statichttprepository(ui, path[7:])