repoview: extract a function for wrapping changelog
I would like to clean up the changelog class by moving out knowledge
of filtering. The filtering will instead be done in a class that wraps
the changelog. This patch prepares for that.
Differential Revision: https://phab.mercurial-scm.org/D7235
# 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.
'''base class for store implementations and store-related utility code'''
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import node, util
from . import lfutil
class StoreError(Exception):
'''Raised when there is a problem getting files from or putting
files to a central store.'''
def __init__(self, filename, hash, url, detail):
self.filename = filename
self.hash = hash
self.url = url
self.detail = detail
def longmessage(self):
return _(b"error getting id %s from url %s for file %s: %s\n") % (
self.hash,
util.hidepassword(self.url),
self.filename,
self.detail,
)
def __str__(self):
return b"%s: %s" % (util.hidepassword(self.url), self.detail)
class basestore(object):
def __init__(self, ui, repo, url):
self.ui = ui
self.repo = repo
self.url = url
def put(self, source, hash):
'''Put source file into the store so it can be retrieved by hash.'''
raise NotImplementedError(b'abstract method')
def exists(self, hashes):
'''Check to see if the store contains the given hashes. Given an
iterable of hashes it returns a mapping from hash to bool.'''
raise NotImplementedError(b'abstract method')
def get(self, files):
'''Get the specified largefiles from the store and write to local
files under repo.root. files is a list of (filename, hash)
tuples. Return (success, missing), lists of files successfully
downloaded and those not found in the store. success is a list
of (filename, hash) tuples; missing is a list of filenames that
we could not get. (The detailed error message will already have
been presented to the user, so missing is just supplied as a
summary.)'''
success = []
missing = []
ui = self.ui
at = 0
available = self.exists(set(hash for (_filename, hash) in files))
with ui.makeprogress(
_(b'getting largefiles'), unit=_(b'files'), total=len(files)
) as progress:
for filename, hash in files:
progress.update(at)
at += 1
ui.note(_(b'getting %s:%s\n') % (filename, hash))
if not available.get(hash):
ui.warn(
_(b'%s: largefile %s not available from %s\n')
% (filename, hash, util.hidepassword(self.url))
)
missing.append(filename)
continue
if self._gethash(filename, hash):
success.append((filename, hash))
else:
missing.append(filename)
return (success, missing)
def _gethash(self, filename, hash):
"""Get file with the provided hash and store it in the local repo's
store and in the usercache.
filename is for informational messages only.
"""
util.makedirs(lfutil.storepath(self.repo, b''))
storefilename = lfutil.storepath(self.repo, hash)
tmpname = storefilename + b'.tmp'
with util.atomictempfile(
tmpname, createmode=self.repo.store.createmode
) as tmpfile:
try:
gothash = self._getfile(tmpfile, filename, hash)
except StoreError as err:
self.ui.warn(err.longmessage())
gothash = b""
if gothash != hash:
if gothash != b"":
self.ui.warn(
_(b'%s: data corruption (expected %s, got %s)\n')
% (filename, hash, gothash)
)
util.unlink(tmpname)
return False
util.rename(tmpname, storefilename)
lfutil.linktousercache(self.repo, hash)
return True
def verify(self, revs, contents=False):
'''Verify the existence (and, optionally, contents) of every big
file revision referenced by every changeset in revs.
Return 0 if all is well, non-zero on any errors.'''
self.ui.status(
_(b'searching %d changesets for largefiles\n') % len(revs)
)
verified = set() # set of (filename, filenode) tuples
filestocheck = [] # list of (cset, filename, expectedhash)
for rev in revs:
cctx = self.repo[rev]
cset = b"%d:%s" % (cctx.rev(), node.short(cctx.node()))
for standin in cctx:
filename = lfutil.splitstandin(standin)
if filename:
fctx = cctx[standin]
key = (filename, fctx.filenode())
if key not in verified:
verified.add(key)
expectedhash = lfutil.readasstandin(fctx)
filestocheck.append((cset, filename, expectedhash))
failed = self._verifyfiles(contents, filestocheck)
numrevs = len(verified)
numlfiles = len({fname for (fname, fnode) in verified})
if contents:
self.ui.status(
_(b'verified contents of %d revisions of %d largefiles\n')
% (numrevs, numlfiles)
)
else:
self.ui.status(
_(b'verified existence of %d revisions of %d largefiles\n')
% (numrevs, numlfiles)
)
return int(failed)
def _getfile(self, tmpfile, filename, hash):
'''Fetch one revision of one file from the store and write it
to tmpfile. Compute the hash of the file on-the-fly as it
downloads and return the hash. Close tmpfile. Raise
StoreError if unable to download the file (e.g. it does not
exist in the store).'''
raise NotImplementedError(b'abstract method')
def _verifyfiles(self, contents, filestocheck):
'''Perform the actual verification of files in the store.
'contents' controls verification of content hash.
'filestocheck' is list of files to check.
Returns _true_ if any problems are found!
'''
raise NotImplementedError(b'abstract method')