Mercurial > hg
view mercurial/statichttprepo.py @ 46335:25be21ec6c65
share: rework config options to be much clearer and easier
Recently I implemented various boolean configs which control how to behave when
there is a share-safe mismatch between source and share repository. Mismatch
means that source supports share-safe where as share does not or vice versa.
However, while discussion and documentation we realized that it's too
complicated and there are some combinations of values which makes no sense.
We decided to introduce a config option with 4 possible values which
makes controlling and understanding things easier.
The config option `share.safe-mismatch.source-{not-}safe` can have
following 4 values:
* abort (default): error out if there is mismatch
* allow: allow to work with respecting share source configuration
* {up|down}grade-abort: try to {up|down}grade, if it fails, abort
* {up|down}grade-allow: try to {up|down}grade, if it fails, continue in allow
mode
I am not sure if I can explain 3 config options which I deleted right now in
just 5 lines which is a sign of how complex they became.
No test changes demonstrate that functionality is same, only names have changed.
Differential Revision: https://phab.mercurial-scm.org/D9785
author | Pulkit Goyal <7895pulkit@gmail.com> |
---|---|
date | Mon, 18 Jan 2021 21:37:20 +0530 |
parents | 5135b393884b |
children | bc2519513ae0 |
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# 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 <mpm@selenic.com> # # 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 .i18n import _ from . import ( branchmap, changelog, error, localrepo, manifest, namespaces, pathutil, pycompat, url, util, vfs as vfsmod, ) urlerr = util.urlerr urlreq = util.urlreq class httprangereader(object): def __init__(self, url, opener): # we assume opener has HTTPRangeHandler self.url = url self.pos = 0 self.opener = opener self.name = url def __enter__(self): return self def __exit__(self, exc_type, exc_value, traceback): self.close() def seek(self, pos): self.pos = pos def read(self, bytes=None): req = urlreq.request(pycompat.strurl(self.url)) end = b'' if bytes: end = self.pos + bytes - 1 if self.pos or end: req.add_header('Range', 'bytes=%d-%s' % (self.pos, end)) try: f = self.opener.open(req) data = f.read() code = f.code except urlerr.httperror as inst: num = inst.code == 404 and errno.ENOENT or None # Explicitly convert the exception to str as Py3 will try # convert it to local encoding and with as the HTTPResponse # instance doesn't support encode. raise IOError(num, str(inst)) except urlerr.urlerror as inst: raise IOError(None, inst.reason) 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 readlines(self): return self.read().splitlines(True) def __iter__(self): return iter(self.readlines()) def close(self): pass # _RangeError and _HTTPRangeHandler were originally in byterange.py, # which was itself extracted from urlgrabber. See the last version of # byterange.py from history if you need more information. class _RangeError(IOError): """Error raised when an unsatisfiable range is requested.""" class _HTTPRangeHandler(urlreq.basehandler): """Handler that enables HTTP Range headers. This was extremely simple. The Range header is a HTTP feature to begin with so all this class does is tell urllib2 that the "206 Partial Content" response from the HTTP server is what we expected. """ def http_error_206(self, req, fp, code, msg, hdrs): # 206 Partial Content Response r = urlreq.addinfourl(fp, hdrs, req.get_full_url()) r.code = code r.msg = msg return r def http_error_416(self, req, fp, code, msg, hdrs): # HTTP's Range Not Satisfiable error raise _RangeError(b'Requested Range Not Satisfiable') def build_opener(ui, authinfo): # urllib cannot handle URLs with embedded user or passwd urlopener = url.opener(ui, authinfo) urlopener.add_handler(_HTTPRangeHandler()) class statichttpvfs(vfsmod.abstractvfs): def __init__(self, base): self.base = base self.options = {} def __call__(self, path, mode=b'r', *args, **kw): if mode not in (b'r', b'rb'): raise IOError(b'Permission denied') f = b"/".join((self.base, urlreq.quote(path))) return httprangereader(f, urlopener) def join(self, path): if path: return pathutil.join(self.base, path) else: return self.base return statichttpvfs class statichttppeer(localrepo.localpeer): def local(self): return None def canpush(self): return False class statichttprepository( localrepo.localrepository, localrepo.revlogfilestorage ): supported = localrepo.localrepository._basesupported def __init__(self, ui, path): self._url = path self.ui = ui self.root = path u = util.url(path.rstrip(b'/') + b"/.hg") self.path, authinfo = u.authinfo() vfsclass = build_opener(ui, authinfo) self.vfs = vfsclass(self.path) self.cachevfs = vfsclass(self.vfs.join(b'cache')) self._phasedefaults = [] self.names = namespaces.namespaces() self.filtername = None self._extrafilterid = None try: requirements = set(self.vfs.read(b'requires').splitlines()) except IOError as inst: if inst.errno != errno.ENOENT: raise requirements = set() # check if it is a non-empty old-style repository try: fp = self.vfs(b"00changelog.i") fp.read(1) fp.close() except IOError as inst: if inst.errno != errno.ENOENT: raise # we do not care about empty old-style repositories here msg = _(b"'%s' does not appear to be an hg repository") % path raise error.RepoError(msg) supportedrequirements = localrepo.gathersupportedrequirements(ui) localrepo.ensurerequirementsrecognized( requirements, supportedrequirements ) localrepo.ensurerequirementscompatible(ui, requirements) # setup store self.store = localrepo.makestore(requirements, self.path, vfsclass) self.spath = self.store.path self.svfs = self.store.opener self.sjoin = self.store.join self._filecache = {} self.requirements = requirements rootmanifest = manifest.manifestrevlog(self.svfs) self.manifestlog = manifest.manifestlog( self.svfs, self, rootmanifest, self.narrowmatch() ) self.changelog = changelog.changelog(self.svfs) self._tags = None self.nodetagscache = None self._branchcaches = branchmap.BranchMapCache() self._revbranchcache = None self.encodepats = None self.decodepats = None self._transref = None def _restrictcapabilities(self, caps): caps = super(statichttprepository, self)._restrictcapabilities(caps) return caps.difference([b"pushkey"]) def url(self): return self._url def local(self): return False def peer(self): return statichttppeer(self) def wlock(self, wait=True): raise error.LockUnavailable( 0, _(b'lock not available'), b'lock', _(b'cannot lock static-http repository'), ) def lock(self, wait=True): raise error.LockUnavailable( 0, _(b'lock not available'), b'lock', _(b'cannot lock static-http repository'), ) def _writecaches(self): pass # statichttprepository are read only def instance(ui, path, create, intents=None, createopts=None): if create: raise error.Abort(_(b'cannot create new static-http repository')) return statichttprepository(ui, path[7:])