##// END OF EJS Templates
namespaces: let namespaces override singlenode() definition...
namespaces: let namespaces override singlenode() definition Some namespaces have multiple nodes per name (meaning that their namemap() returns multiple nodes). One such namespace is the "topics" namespace (from the evolve repo). We also have our own internal namespace at Google (for review units) that has multiple nodes per name. These namespaces may not want to use the default "pick highest revnum" resolution that we currently use when resolving a name to a single node. As an example, they may decide that `hg co <name>` should check out a commit that's last in some sense even if an earlier commit had just been amended and thus had a higher revnum [1]. This patch gives the namespace the option to continue to return multiple nodes and to override how the best node is picked. Allowing namespaces to override that may also be useful as an optimization (it may be cheaper for the namespace to find just that node). I have been arguing (in D3715) for using all the nodes returned from namemap() when resolving the symbol to a revset, so e.g. `hg log -r stable` would resolve to *all* nodes on stable, not just the one with the highest revnum (except that I don't actually think we should change it for the branch namespace because of BC). Most people seem opposed to that. If we decide not to do it, I think we can deprecate the namemap() function in favor of the new singlenode() (I find it weird to have namespaces, like the branch namespace, where namemap() isn't nodemap()'s inverse). I therefore think this patch makes sense regardless of what we decide on that issue. [1] Actually, even the branch namespace would have wanted to override singlenode() if it had supported multiple nodes. That's because closes branch heads are mostly ignored, so "hg co default" will not check out the highest-revnum node if that's a closed head. Differential Revision: https://phab.mercurial-scm.org/D3852

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r37102:f0b6fbea default
r38505:4c068365 @58 default
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remotestore.py
132 lines | 4.9 KiB | text/x-python | PythonLexer
# Copyright 2010-2011 Fog Creek Software
# Copyright 2010-2011 Unity Technologies
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''remote largefile store; the base class for wirestore'''
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import (
error,
util,
)
from mercurial.utils import (
stringutil,
)
from . import (
basestore,
lfutil,
localstore,
)
urlerr = util.urlerr
urlreq = util.urlreq
class remotestore(basestore.basestore):
'''a largefile store accessed over a network'''
def __init__(self, ui, repo, url):
super(remotestore, self).__init__(ui, repo, url)
self._lstore = None
if repo is not None:
self._lstore = localstore.localstore(self.ui, self.repo, self.repo)
def put(self, source, hash):
if self.sendfile(source, hash):
raise error.Abort(
_('remotestore: could not put %s to remote store %s')
% (source, util.hidepassword(self.url)))
self.ui.debug(
_('remotestore: put %s to remote store %s\n')
% (source, util.hidepassword(self.url)))
def exists(self, hashes):
return dict((h, s == 0) for (h, s) in # dict-from-generator
self._stat(hashes).iteritems())
def sendfile(self, filename, hash):
self.ui.debug('remotestore: sendfile(%s, %s)\n' % (filename, hash))
try:
with lfutil.httpsendfile(self.ui, filename) as fd:
return self._put(hash, fd)
except IOError as e:
raise error.Abort(
_('remotestore: could not open file %s: %s')
% (filename, stringutil.forcebytestr(e)))
def _getfile(self, tmpfile, filename, hash):
try:
chunks = self._get(hash)
except urlerr.httperror as e:
# 401s get converted to error.Aborts; everything else is fine being
# turned into a StoreError
raise basestore.StoreError(filename, hash, self.url,
stringutil.forcebytestr(e))
except urlerr.urlerror as e:
# This usually indicates a connection problem, so don't
# keep trying with the other files... they will probably
# all fail too.
raise error.Abort('%s: %s' %
(util.hidepassword(self.url), e.reason))
except IOError as e:
raise basestore.StoreError(filename, hash, self.url,
stringutil.forcebytestr(e))
return lfutil.copyandhash(chunks, tmpfile)
def _hashesavailablelocally(self, hashes):
existslocallymap = self._lstore.exists(hashes)
localhashes = [hash for hash in hashes if existslocallymap[hash]]
return localhashes
def _verifyfiles(self, contents, filestocheck):
failed = False
expectedhashes = [expectedhash
for cset, filename, expectedhash in filestocheck]
localhashes = self._hashesavailablelocally(expectedhashes)
stats = self._stat([expectedhash for expectedhash in expectedhashes
if expectedhash not in localhashes])
for cset, filename, expectedhash in filestocheck:
if expectedhash in localhashes:
filetocheck = (cset, filename, expectedhash)
verifyresult = self._lstore._verifyfiles(contents,
[filetocheck])
if verifyresult:
failed = True
else:
stat = stats[expectedhash]
if stat:
if stat == 1:
self.ui.warn(
_('changeset %s: %s: contents differ\n')
% (cset, filename))
failed = True
elif stat == 2:
self.ui.warn(
_('changeset %s: %s missing\n')
% (cset, filename))
failed = True
else:
raise RuntimeError('verify failed: unexpected response '
'from statlfile (%r)' % stat)
return failed
def _put(self, hash, fd):
'''Put file with the given hash in the remote store.'''
raise NotImplementedError('abstract method')
def _get(self, hash):
'''Get a iterator for content with the given hash.'''
raise NotImplementedError('abstract method')
def _stat(self, hashes):
'''Get information about availability of files specified by
hashes in the remote store. Return dictionary mapping hashes
to return code where 0 means that file is available, other
values if not.'''
raise NotImplementedError('abstract method')