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hgext/largefiles/localstore.py
author Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
Fri, 13 Jul 2012 21:47:06 +0200
changeset 17192 1ac628cd7113
parent 17191 5884812686f7
child 17411 a02e36568e88
child 17424 e7cfe3587ea4
permissions -rw-r--r--
peer: introduce real peer classes This change separates peer implementations from the repository implementation. localpeer currently is a simple pass-through to localrepository, except for legacy calls, which have already been removed from localpeer. This ensures that the local client code only uses the most modern peer API when talking to local repos. Peers have a .local() method which returns either None or the underlying localrepository (or descendant thereof). Repos have a .peer() method to return a freshly constructed localpeer. The latter is used by hg.peer(), and also to allow folks to pass either a peer or a repo to some generic helper methods. We might want to get rid of .peer() eventually. The only user of locallegacypeer is debugdiscovery, which uses it to pose as a pre-setdiscovery client. But we decided to leave the old API defined in locallegacypeer for clarity and maybe for other uses in the future. It might be nice to actually define the peer API directly in peer.py as stub methods. One problem there is, however, that localpeer implements lock/addchangegroup, whereas the true remote peers implement unbundle. It might be desireable to get rid of this distinction eventually.

# Copyright 2009-2010 Gregory P. Ward
# Copyright 2009-2010 Intelerad Medical Systems Incorporated
# 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.

'''store class for local filesystem'''

import os

from mercurial import util
from mercurial.i18n import _

import lfutil
import basestore

class localstore(basestore.basestore):
    '''localstore first attempts to grab files out of the store in the remote
    Mercurial repository.  Failling that, it attempts to grab the files from
    the user cache.'''

    def __init__(self, ui, repo, remote):
        url = os.path.join(remote.local().path, '.hg', lfutil.longname)
        super(localstore, self).__init__(ui, repo, util.expandpath(url))
        self.remote = remote.local()

    def put(self, source, hash):
        util.makedirs(os.path.dirname(lfutil.storepath(self.remote, hash)))
        if lfutil.instore(self.remote, hash):
            return
        lfutil.link(lfutil.storepath(self.repo, hash),
                lfutil.storepath(self.remote, hash))

    def exists(self, hash):
        return lfutil.instore(self.remote, hash)

    def _getfile(self, tmpfile, filename, hash):
        if lfutil.instore(self.remote, hash):
            path = lfutil.storepath(self.remote, hash)
        elif lfutil.inusercache(self.ui, hash):
            path = lfutil.usercachepath(self.ui, hash)
        else:
            raise basestore.StoreError(filename, hash, '',
                _("can't get file locally"))
        fd = open(path, 'rb')
        try:
            return lfutil.copyandhash(fd, tmpfile)
        finally:
            fd.close()

    def _verifyfile(self, cctx, cset, contents, standin, verified):
        filename = lfutil.splitstandin(standin)
        if not filename:
            return False
        fctx = cctx[standin]
        key = (filename, fctx.filenode())
        if key in verified:
            return False

        expecthash = fctx.data()[0:40]
        verified.add(key)
        if not lfutil.instore(self.remote, expecthash):
            self.ui.warn(
                _('changeset %s: %s missing\n'
                  '  (looked for hash %s)\n')
                % (cset, filename, expecthash))
            return True                 # failed

        if contents:
            storepath = lfutil.storepath(self.remote, expecthash)
            actualhash = lfutil.hashfile(storepath)
            if actualhash != expecthash:
                self.ui.warn(
                    _('changeset %s: %s: contents differ\n'
                      '  (%s:\n'
                      '  expected hash %s,\n'
                      '  but got %s)\n')
                    % (cset, filename, storepath, expecthash, actualhash))
                return True             # failed
        return False
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