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# Copyright 2009-2010 Gregory P. Ward
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# Copyright 2009-2010 Intelerad Medical Systems Incorporated
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# Copyright 2010-2011 Fog Creek Software
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# Copyright 2010-2011 Unity Technologies
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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'''base class for store implementations and store-related utility code'''
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import binascii
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import re
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from mercurial import util, node, hg
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from mercurial.i18n import _
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import lfutil
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class StoreError(Exception):
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'''Raised when there is a problem getting files from or putting
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files to a central store.'''
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def __init__(self, filename, hash, url, detail):
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self.filename = filename
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self.hash = hash
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self.url = url
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self.detail = detail
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def longmessage(self):
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return (_("error getting id %s from url %s for file %s: %s\n") %
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(self.hash, self.url, self.filename, self.detail))
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def __str__(self):
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return "%s: %s" % (self.url, self.detail)
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class basestore(object):
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def __init__(self, ui, repo, url):
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self.ui = ui
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self.repo = repo
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self.url = url
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def put(self, source, hash):
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'''Put source file into the store under <filename>/<hash>.'''
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raise NotImplementedError('abstract method')
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def exists(self, hashes):
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'''Check to see if the store contains the given hashes. Given an
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iterable of hashes it returns a mapping from hash to bool.'''
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raise NotImplementedError('abstract method')
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def get(self, files):
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'''Get the specified largefiles from the store and write to local
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files under repo.root. files is a list of (filename, hash)
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tuples. Return (success, missing), lists of files successfully
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downloaded and those not found in the store. success is a list
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of (filename, hash) tuples; missing is a list of filenames that
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we could not get. (The detailed error message will already have
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been presented to the user, so missing is just supplied as a
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summary.)'''
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success = []
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missing = []
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ui = self.ui
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at = 0
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for filename, hash in files:
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ui.progress(_('getting largefiles'), at, unit='lfile',
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total=len(files))
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at += 1
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ui.note(_('getting %s:%s\n') % (filename, hash))
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storefilename = lfutil.storepath(self.repo, hash)
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tmpfile = util.atomictempfile(storefilename + '.tmp',
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createmode=self.repo.store.createmode)
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try:
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hhash = binascii.hexlify(self._getfile(tmpfile, filename, hash))
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except StoreError, err:
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ui.warn(err.longmessage())
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hhash = ""
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tmpfile.close() # has probably already been closed!
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if hhash != hash:
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if hhash != "":
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ui.warn(_('%s: data corruption (expected %s, got %s)\n')
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% (filename, hash, hhash))
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util.unlink(storefilename + '.tmp')
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missing.append(filename)
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continue
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util.rename(storefilename + '.tmp', storefilename)
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lfutil.linktousercache(self.repo, hash)
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success.append((filename, hhash))
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ui.progress(_('getting largefiles'), None)
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return (success, missing)
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def verify(self, revs, contents=False):
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'''Verify the existence (and, optionally, contents) of every big
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file revision referenced by every changeset in revs.
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Return 0 if all is well, non-zero on any errors.'''
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failed = False
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self.ui.status(_('searching %d changesets for largefiles\n') %
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len(revs))
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verified = set() # set of (filename, filenode) tuples
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for rev in revs:
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cctx = self.repo[rev]
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cset = "%d:%s" % (cctx.rev(), node.short(cctx.node()))
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for standin in cctx:
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if self._verifyfile(cctx, cset, contents, standin, verified):
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failed = True
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numrevs = len(verified)
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numlfiles = len(set([fname for (fname, fnode) in verified]))
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if contents:
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self.ui.status(
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_('verified contents of %d revisions of %d largefiles\n')
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% (numrevs, numlfiles))
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else:
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self.ui.status(
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_('verified existence of %d revisions of %d largefiles\n')
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% (numrevs, numlfiles))
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return int(failed)
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def _getfile(self, tmpfile, filename, hash):
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'''Fetch one revision of one file from the store and write it
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to tmpfile. Compute the hash of the file on-the-fly as it
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downloads and return the binary hash. Close tmpfile. Raise
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StoreError if unable to download the file (e.g. it does not
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exist in the store).'''
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raise NotImplementedError('abstract method')
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def _verifyfile(self, cctx, cset, contents, standin, verified):
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'''Perform the actual verification of a file in the store.
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'''
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raise NotImplementedError('abstract method')
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import localstore, wirestore
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_storeprovider = {
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'file': [localstore.localstore],
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'http': [wirestore.wirestore],
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'https': [wirestore.wirestore],
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'ssh': [wirestore.wirestore],
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}
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_scheme_re = re.compile(r'^([a-zA-Z0-9+-.]+)://')
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# During clone this function is passed the src's ui object
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# but it needs the dest's ui object so it can read out of
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# the config file. Use repo.ui instead.
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def _openstore(repo, remote=None, put=False):
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ui = repo.ui
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if not remote:
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lfpullsource = getattr(repo, 'lfpullsource', None)
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if lfpullsource:
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path = ui.expandpath(lfpullsource)
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else:
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path = ui.expandpath('default-push', 'default')
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# ui.expandpath() leaves 'default-push' and 'default' alone if
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# they cannot be expanded: fallback to the empty string,
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# meaning the current directory.
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if path == 'default-push' or path == 'default':
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path = ''
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remote = repo
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else:
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path, _branches = hg.parseurl(path)
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remote = hg.peer(repo, {}, path)
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# The path could be a scheme so use Mercurial's normal functionality
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# to resolve the scheme to a repository and use its path
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path = util.safehasattr(remote, 'url') and remote.url() or remote.path
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match = _scheme_re.match(path)
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if not match: # regular filesystem path
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scheme = 'file'
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else:
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scheme = match.group(1)
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try:
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storeproviders = _storeprovider[scheme]
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except KeyError:
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raise util.Abort(_('unsupported URL scheme %r') % scheme)
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for classobj in storeproviders:
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try:
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return classobj(ui, repo, remote)
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except lfutil.storeprotonotcapable:
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pass
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raise util.Abort(_('%s does not appear to be a largefile store') % path)
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