hgext/largefiles/localstore.py

rebase: improve error message on improper phases

The previous error message had two issues: The first issue was that it
wasn't, in fact, an error but a warning, even though it described a
fatal error condition preventing the successful completion of the
command. The second was that it didn't mention the immutable
changesets, leaving the user guessing at the true cause of the error.

The main downside to this change is that we now get an 'abort: can't
abort...' message which technically contradicts itself. In this case,
I blame that on the two uses we have for the word; if it weren't for
backwards compatibility, we could make util.Abort print out 'error:
<whatever>'.

# 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.path, '.hg', lfutil.longname)
        super(localstore, self).__init__(ui, repo, util.expandpath(url))
        self.remote = remote

    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