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https://github.com/facebook/sapling.git
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b4b2d140d9
statichttprepo inherits from localrepository. In doing so, it obtains default implementations of various methods, like wlock(). Before this change, tags cache writing would call repo.wlock(). This failed on statichttprepo due to localrepository's wlock() looking for an instance attribute that doesn't exist on statichttprepo (statichttprepo doesn't call localrepository.__init__). We /could/ define missing attributes until the base wlock() works. However, a statichttprepo is remote and read-only and can't be locked. The class already has a lock() that short circuits. So it makes sense to implement a short-circuited wlock() as well. That is what this patch does. LockError is expected to be raised when locking fails. The constructor takes a number of arguments that are local repository centric. Rather than rework LockError to not require them (which would not be appropriate for stable), this commit populates dummy values. I don't believe they'll ever be seen by the user, as lock failures on static http repos should be limited to well-defined (and tested) scenarios. We can and should revisit the LockError type to improve this.
199 lines
5.7 KiB
Python
199 lines
5.7 KiB
Python
# statichttprepo.py - simple http repository class for mercurial
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#
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# This provides read-only repo access to repositories exported via static http
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import errno
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import os
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from .i18n import _
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from . import (
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byterange,
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changelog,
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error,
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localrepo,
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manifest,
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namespaces,
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scmutil,
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store,
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url,
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util,
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vfs as vfsmod,
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)
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urlerr = util.urlerr
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urlreq = util.urlreq
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class httprangereader(object):
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def __init__(self, url, opener):
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# we assume opener has HTTPRangeHandler
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self.url = url
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self.pos = 0
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self.opener = opener
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self.name = url
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.close()
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def seek(self, pos):
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self.pos = pos
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def read(self, bytes=None):
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req = urlreq.request(self.url)
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end = ''
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if bytes:
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end = self.pos + bytes - 1
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if self.pos or end:
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req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
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try:
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f = self.opener.open(req)
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data = f.read()
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code = f.code
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except urlerr.httperror as inst:
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num = inst.code == 404 and errno.ENOENT or None
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raise IOError(num, inst)
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except urlerr.urlerror as inst:
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raise IOError(None, inst.reason[1])
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if code == 200:
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# HTTPRangeHandler does nothing if remote does not support
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# Range headers and returns the full entity. Let's slice it.
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if bytes:
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data = data[self.pos:self.pos + bytes]
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else:
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data = data[self.pos:]
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elif bytes:
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data = data[:bytes]
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self.pos += len(data)
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return data
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def readlines(self):
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return self.read().splitlines(True)
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def __iter__(self):
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return iter(self.readlines())
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def close(self):
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pass
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def build_opener(ui, authinfo):
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# urllib cannot handle URLs with embedded user or passwd
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urlopener = url.opener(ui, authinfo)
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urlopener.add_handler(byterange.HTTPRangeHandler())
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class statichttpvfs(vfsmod.abstractvfs):
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def __init__(self, base):
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self.base = base
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def __call__(self, path, mode='r', *args, **kw):
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if mode not in ('r', 'rb'):
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raise IOError('Permission denied')
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f = "/".join((self.base, urlreq.quote(path)))
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return httprangereader(f, urlopener)
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def join(self, path):
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if path:
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return os.path.join(self.base, path)
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else:
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return self.base
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return statichttpvfs
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class statichttppeer(localrepo.localpeer):
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def local(self):
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return None
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def canpush(self):
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return False
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class statichttprepository(localrepo.localrepository):
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supported = localrepo.localrepository._basesupported
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def __init__(self, ui, path):
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self._url = path
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self.ui = ui
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self.root = path
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u = util.url(path.rstrip('/') + "/.hg")
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self.path, authinfo = u.authinfo()
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vfsclass = build_opener(ui, authinfo)
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self.vfs = vfsclass(self.path)
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self.cachevfs = vfsclass(self.vfs.join('cache'))
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self._phasedefaults = []
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self.names = namespaces.namespaces()
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self.filtername = None
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try:
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requirements = scmutil.readrequires(self.vfs, self.supported)
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except IOError as inst:
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if inst.errno != errno.ENOENT:
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raise
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requirements = set()
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# check if it is a non-empty old-style repository
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try:
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fp = self.vfs("00changelog.i")
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fp.read(1)
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fp.close()
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except IOError as inst:
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if inst.errno != errno.ENOENT:
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raise
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# we do not care about empty old-style repositories here
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msg = _("'%s' does not appear to be an hg repository") % path
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raise error.RepoError(msg)
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# setup store
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self.store = store.store(requirements, self.path, vfsclass)
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self.spath = self.store.path
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self.svfs = self.store.opener
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self.sjoin = self.store.join
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self._filecache = {}
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self.requirements = requirements
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self.manifestlog = manifest.manifestlog(self.svfs, self)
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self.changelog = changelog.changelog(self.svfs)
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self._tags = None
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self.nodetagscache = None
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self._branchcaches = {}
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self._revbranchcache = None
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self.encodepats = None
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self.decodepats = None
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self._transref = None
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# Cache of types representing filtered repos.
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self._filteredrepotypes = {}
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def _restrictcapabilities(self, caps):
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caps = super(statichttprepository, self)._restrictcapabilities(caps)
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return caps.difference(["pushkey"])
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def url(self):
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return self._url
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def local(self):
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return False
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def peer(self):
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return statichttppeer(self)
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def wlock(self, wait=True):
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raise error.LockUnavailable(0, _('lock not available'), 'lock',
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_('cannot lock static-http repository'))
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def lock(self, wait=True):
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raise error.Abort(_('cannot lock static-http repository'))
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def _writecaches(self):
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pass # statichttprepository are read only
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def instance(ui, path, create):
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if create:
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raise error.Abort(_('cannot create new static-http repository'))
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return statichttprepository(ui, path[7:])
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