remotefilelog: use sysstr to check for attribute presence

We do not need bytes here.

hgext/remotefilelog/__init__.py

@@ -1,1259 +1,1259 b''
 # __init__.py - remotefilelog extension
 #
 # Copyright 2013 Facebook, Inc.
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 """remotefilelog causes Mercurial to lazilly fetch file contents (EXPERIMENTAL)
 
 This extension is HIGHLY EXPERIMENTAL. There are NO BACKWARDS COMPATIBILITY
 GUARANTEES. This means that repositories created with this extension may
 only be usable with the exact version of this extension/Mercurial that was
 used. The extension attempts to enforce this in order to prevent repository
 corruption.
 
 remotefilelog works by fetching file contents lazily and storing them
 in a cache on the client rather than in revlogs. This allows enormous
 histories to be transferred only partially, making them easier to
 operate on.
 
 Configs:
 
     ``packs.maxchainlen`` specifies the maximum delta chain length in pack files
 
     ``packs.maxpacksize`` specifies the maximum pack file size
 
     ``packs.maxpackfilecount`` specifies the maximum number of packs in the
       shared cache (trees only for now)
 
     ``remotefilelog.backgroundprefetch`` runs prefetch in background when True
 
     ``remotefilelog.bgprefetchrevs`` specifies revisions to fetch on commit and
       update, and on other commands that use them. Different from pullprefetch.
 
     ``remotefilelog.gcrepack`` does garbage collection during repack when True
 
     ``remotefilelog.nodettl`` specifies maximum TTL of a node in seconds before
       it is garbage collected
 
     ``remotefilelog.repackonhggc`` runs repack on hg gc when True
 
     ``remotefilelog.prefetchdays`` specifies the maximum age of a commit in
       days after which it is no longer prefetched.
 
     ``remotefilelog.prefetchdelay`` specifies delay between background
       prefetches in seconds after operations that change the working copy parent
 
     ``remotefilelog.data.gencountlimit`` constraints the minimum number of data
       pack files required to be considered part of a generation. In particular,
       minimum number of packs files > gencountlimit.
 
     ``remotefilelog.data.generations`` list for specifying the lower bound of
       each generation of the data pack files. For example, list ['100MB','1MB']
       or ['1MB', '100MB'] will lead to three generations: [0, 1MB), [
       1MB, 100MB) and [100MB, infinity).
 
     ``remotefilelog.data.maxrepackpacks`` the maximum number of pack files to
       include in an incremental data repack.
 
     ``remotefilelog.data.repackmaxpacksize`` the maximum size of a pack file for
       it to be considered for an incremental data repack.
 
     ``remotefilelog.data.repacksizelimit`` the maximum total size of pack files
       to include in an incremental data repack.
 
     ``remotefilelog.history.gencountlimit`` constraints the minimum number of
       history pack files required to be considered part of a generation. In
       particular, minimum number of packs files > gencountlimit.
 
     ``remotefilelog.history.generations`` list for specifying the lower bound of
       each generation of the history pack files. For example, list [
       '100MB', '1MB'] or ['1MB', '100MB'] will lead to three generations: [
       0, 1MB), [1MB, 100MB) and [100MB, infinity).
 
     ``remotefilelog.history.maxrepackpacks`` the maximum number of pack files to
       include in an incremental history repack.
 
     ``remotefilelog.history.repackmaxpacksize`` the maximum size of a pack file
       for it to be considered for an incremental history repack.
 
     ``remotefilelog.history.repacksizelimit`` the maximum total size of pack
       files to include in an incremental history repack.
 
     ``remotefilelog.backgroundrepack`` automatically consolidate packs in the
       background
 
     ``remotefilelog.cachepath`` path to cache
 
     ``remotefilelog.cachegroup`` if set, make cache directory sgid to this
       group
 
     ``remotefilelog.cacheprocess`` binary to invoke for fetching file data
 
     ``remotefilelog.debug`` turn on remotefilelog-specific debug output
 
     ``remotefilelog.excludepattern`` pattern of files to exclude from pulls
 
     ``remotefilelog.includepattern`` pattern of files to include in pulls
 
     ``remotefilelog.fetchwarning``: message to print when too many
       single-file fetches occur
 
     ``remotefilelog.getfilesstep`` number of files to request in a single RPC
 
     ``remotefilelog.getfilestype`` if set to 'threaded' use threads to fetch
       files, otherwise use optimistic fetching
 
     ``remotefilelog.pullprefetch`` revset for selecting files that should be
       eagerly downloaded rather than lazily
 
     ``remotefilelog.reponame`` name of the repo. If set, used to partition
       data from other repos in a shared store.
 
     ``remotefilelog.server`` if true, enable server-side functionality
 
     ``remotefilelog.servercachepath`` path for caching blobs on the server
 
     ``remotefilelog.serverexpiration`` number of days to keep cached server
       blobs
 
     ``remotefilelog.validatecache`` if set, check cache entries for corruption
       before returning blobs
 
     ``remotefilelog.validatecachelog`` if set, check cache entries for
       corruption before returning metadata
 
 """
 
 import os
 import time
 import traceback
 
 from mercurial.node import (
     hex,
     wdirrev,
 )
 from mercurial.i18n import _
 from mercurial.pycompat import open
 from mercurial import (
     changegroup,
     changelog,
     commands,
     configitems,
     context,
     copies,
     debugcommands as hgdebugcommands,
     dispatch,
     error,
     exchange,
     extensions,
     hg,
     localrepo,
     match as matchmod,
     merge,
     mergestate as mergestatemod,
     patch,
     pycompat,
     registrar,
     repair,
     repoview,
     revset,
     scmutil,
     smartset,
     streamclone,
     util,
 )
 from . import (
     constants,
     debugcommands,
     fileserverclient,
     remotefilectx,
     remotefilelog,
     remotefilelogserver,
     repack as repackmod,
     shallowbundle,
     shallowrepo,
     shallowstore,
     shallowutil,
     shallowverifier,
 )
 
 # ensures debug commands are registered
 hgdebugcommands.command
 
 cmdtable = {}
 command = registrar.command(cmdtable)
 
 configtable = {}
 configitem = registrar.configitem(configtable)
 
 configitem(b'remotefilelog', b'debug', default=False)
 
 configitem(b'remotefilelog', b'reponame', default=b'')
 configitem(b'remotefilelog', b'cachepath', default=None)
 configitem(b'remotefilelog', b'cachegroup', default=None)
 configitem(b'remotefilelog', b'cacheprocess', default=None)
 configitem(b'remotefilelog', b'cacheprocess.includepath', default=None)
 configitem(b"remotefilelog", b"cachelimit", default=b"1000 GB")
 
 configitem(
     b'remotefilelog',
     b'fallbackpath',
     default=configitems.dynamicdefault,
     alias=[(b'remotefilelog', b'fallbackrepo')],
 )
 
 configitem(b'remotefilelog', b'validatecachelog', default=None)
 configitem(b'remotefilelog', b'validatecache', default=b'on')
 configitem(b'remotefilelog', b'server', default=None)
 configitem(b'remotefilelog', b'servercachepath', default=None)
 configitem(b"remotefilelog", b"serverexpiration", default=30)
 configitem(b'remotefilelog', b'backgroundrepack', default=False)
 configitem(b'remotefilelog', b'bgprefetchrevs', default=None)
 configitem(b'remotefilelog', b'pullprefetch', default=None)
 configitem(b'remotefilelog', b'backgroundprefetch', default=False)
 configitem(b'remotefilelog', b'prefetchdelay', default=120)
 configitem(b'remotefilelog', b'prefetchdays', default=14)
 # Other values include 'local' or 'none'. Any unrecognized value is 'all'.
 configitem(b'remotefilelog', b'strip.includefiles', default='all')
 
 configitem(b'remotefilelog', b'getfilesstep', default=10000)
 configitem(b'remotefilelog', b'getfilestype', default=b'optimistic')
 configitem(b'remotefilelog', b'batchsize', configitems.dynamicdefault)
 configitem(b'remotefilelog', b'fetchwarning', default=b'')
 
 configitem(b'remotefilelog', b'includepattern', default=None)
 configitem(b'remotefilelog', b'excludepattern', default=None)
 
 configitem(b'remotefilelog', b'gcrepack', default=False)
 configitem(b'remotefilelog', b'repackonhggc', default=False)
 configitem(b'repack', b'chainorphansbysize', default=True, experimental=True)
 
 configitem(b'packs', b'maxpacksize', default=0)
 configitem(b'packs', b'maxchainlen', default=1000)
 
 configitem(b'devel', b'remotefilelog.bg-wait', default=False)
 
 #  default TTL limit is 30 days
 _defaultlimit = 60 * 60 * 24 * 30
 configitem(b'remotefilelog', b'nodettl', default=_defaultlimit)
 
 configitem(b'remotefilelog', b'data.gencountlimit', default=2),
 configitem(
     b'remotefilelog', b'data.generations', default=[b'1GB', b'100MB', b'1MB']
 )
 configitem(b'remotefilelog', b'data.maxrepackpacks', default=50)
 configitem(b'remotefilelog', b'data.repackmaxpacksize', default=b'4GB')
 configitem(b'remotefilelog', b'data.repacksizelimit', default=b'100MB')
 
 configitem(b'remotefilelog', b'history.gencountlimit', default=2),
 configitem(b'remotefilelog', b'history.generations', default=[b'100MB'])
 configitem(b'remotefilelog', b'history.maxrepackpacks', default=50)
 configitem(b'remotefilelog', b'history.repackmaxpacksize', default=b'400MB')
 configitem(b'remotefilelog', b'history.repacksizelimit', default=b'100MB')
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = b'ships-with-hg-core'
 
 repoclass = localrepo.localrepository
 repoclass._basesupported.add(constants.SHALLOWREPO_REQUIREMENT)
 
 isenabled = shallowutil.isenabled
 
 
 def uisetup(ui):
     """Wraps user facing Mercurial commands to swap them out with shallow
     versions.
     """
     hg.wirepeersetupfuncs.append(fileserverclient.peersetup)
 
     entry = extensions.wrapcommand(commands.table, b'clone', cloneshallow)
     entry[1].append(
         (
             b'',
             b'shallow',
             None,
             _(b"create a shallow clone which uses remote file history"),
         )
     )
 
     extensions.wrapcommand(
         commands.table, b'debugindex', debugcommands.debugindex
     )
     extensions.wrapcommand(
         commands.table, b'debugindexdot', debugcommands.debugindexdot
     )
     extensions.wrapcommand(commands.table, b'log', log)
     extensions.wrapcommand(commands.table, b'pull', pull)
 
     # Prevent 'hg manifest --all'
     def _manifest(orig, ui, repo, *args, **opts):
         if isenabled(repo) and opts.get('all'):
             raise error.Abort(_(b"--all is not supported in a shallow repo"))
 
         return orig(ui, repo, *args, **opts)
 
     extensions.wrapcommand(commands.table, b"manifest", _manifest)
 
     # Wrap remotefilelog with lfs code
     def _lfsloaded(loaded=False):
         lfsmod = None
         try:
             lfsmod = extensions.find(b'lfs')
         except KeyError:
             pass
         if lfsmod:
             lfsmod.wrapfilelog(remotefilelog.remotefilelog)
             fileserverclient._lfsmod = lfsmod
 
     extensions.afterloaded(b'lfs', _lfsloaded)
 
     # debugdata needs remotefilelog.len to work
     extensions.wrapcommand(commands.table, b'debugdata', debugdatashallow)
 
     changegroup.cgpacker = shallowbundle.shallowcg1packer
 
     extensions.wrapfunction(
         changegroup, '_addchangegroupfiles', shallowbundle.addchangegroupfiles
     )
     extensions.wrapfunction(
         changegroup, 'makechangegroup', shallowbundle.makechangegroup
     )
     extensions.wrapfunction(localrepo, 'makestore', storewrapper)
     extensions.wrapfunction(exchange, 'pull', exchangepull)
     extensions.wrapfunction(merge, 'applyupdates', applyupdates)
     extensions.wrapfunction(merge, '_checkunknownfiles', checkunknownfiles)
     extensions.wrapfunction(context.workingctx, '_checklookup', checklookup)
     extensions.wrapfunction(scmutil, '_findrenames', findrenames)
     extensions.wrapfunction(
         copies, '_computeforwardmissing', computeforwardmissing
     )
     extensions.wrapfunction(dispatch, 'runcommand', runcommand)
     extensions.wrapfunction(repair, '_collectbrokencsets', _collectbrokencsets)
     extensions.wrapfunction(context.changectx, 'filectx', filectx)
     extensions.wrapfunction(context.workingctx, 'filectx', workingfilectx)
     extensions.wrapfunction(patch, 'trydiff', trydiff)
     extensions.wrapfunction(hg, 'verify', _verify)
     scmutil.fileprefetchhooks.add(b'remotefilelog', _fileprefetchhook)
 
     # disappointing hacks below
     extensions.wrapfunction(scmutil, 'getrenamedfn', getrenamedfn)
     extensions.wrapfunction(revset, 'filelog', filelogrevset)
     revset.symbols[b'filelog'] = revset.filelog
 
 
 def cloneshallow(orig, ui, repo, *args, **opts):
     if opts.get('shallow'):
         repos = []
 
         def pull_shallow(orig, self, *args, **kwargs):
             if not isenabled(self):
                 repos.append(self.unfiltered())
                 # set up the client hooks so the post-clone update works
                 setupclient(self.ui, self.unfiltered())
 
                 # setupclient fixed the class on the repo itself
                 # but we also need to fix it on the repoview
                 if isinstance(self, repoview.repoview):
                     self.__class__.__bases__ = (
                         self.__class__.__bases__[0],
                         self.unfiltered().__class__,
                     )
                 self.requirements.add(constants.SHALLOWREPO_REQUIREMENT)
                 with self.lock():
                     # acquire store lock before writing requirements as some
                     # requirements might be written to .hg/store/requires
                     scmutil.writereporequirements(self)
 
                 # Since setupclient hadn't been called, exchange.pull was not
                 # wrapped. So we need to manually invoke our version of it.
                 return exchangepull(orig, self, *args, **kwargs)
             else:
                 return orig(self, *args, **kwargs)
 
         extensions.wrapfunction(exchange, 'pull', pull_shallow)
 
         # Wrap the stream logic to add requirements and to pass include/exclude
         # patterns around.
         def setup_streamout(repo, remote):
             # Replace remote.stream_out with a version that sends file
             # patterns.
             def stream_out_shallow(orig):
                 caps = remote.capabilities()
                 if constants.NETWORK_CAP_LEGACY_SSH_GETFILES in caps:
                     opts = {}
                     if repo.includepattern:
                         opts['includepattern'] = b'\0'.join(repo.includepattern)
                     if repo.excludepattern:
                         opts['excludepattern'] = b'\0'.join(repo.excludepattern)
                     return remote._callstream(b'stream_out_shallow', **opts)
                 else:
                     return orig()
 
             extensions.wrapfunction(remote, 'stream_out', stream_out_shallow)
 
         def stream_wrap(orig, op):
             setup_streamout(op.repo, op.remote)
             return orig(op)
 
         extensions.wrapfunction(
             streamclone, 'maybeperformlegacystreamclone', stream_wrap
         )
 
         def canperformstreamclone(orig, pullop, bundle2=False):
             # remotefilelog is currently incompatible with the
             # bundle2 flavor of streamclones, so force us to use
             # v1 instead.
             if b'v2' in pullop.remotebundle2caps.get(b'stream', []):
                 pullop.remotebundle2caps[b'stream'] = []
             if bundle2:
                 return False, None
             supported, requirements = orig(pullop, bundle2=bundle2)
             if requirements is not None:
                 requirements.add(constants.SHALLOWREPO_REQUIREMENT)
             return supported, requirements
 
         extensions.wrapfunction(
             streamclone, 'canperformstreamclone', canperformstreamclone
         )
 
     try:
         orig(ui, repo, *args, **opts)
     finally:
         if opts.get('shallow'):
             for r in repos:
-                if util.safehasattr(r, b'fileservice'):
+                if util.safehasattr(r, 'fileservice'):
                     r.fileservice.close()
 
 
 def debugdatashallow(orig, *args, **kwds):
     oldlen = remotefilelog.remotefilelog.__len__
     try:
         remotefilelog.remotefilelog.__len__ = lambda x: 1
         return orig(*args, **kwds)
     finally:
         remotefilelog.remotefilelog.__len__ = oldlen
 
 
 def reposetup(ui, repo):
     if not repo.local():
         return
 
     # put here intentionally bc doesnt work in uisetup
     ui.setconfig(b'hooks', b'update.prefetch', wcpprefetch)
     ui.setconfig(b'hooks', b'commit.prefetch', wcpprefetch)
 
     isserverenabled = ui.configbool(b'remotefilelog', b'server')
     isshallowclient = isenabled(repo)
 
     if isserverenabled and isshallowclient:
         raise RuntimeError(b"Cannot be both a server and shallow client.")
 
     if isshallowclient:
         setupclient(ui, repo)
 
     if isserverenabled:
         remotefilelogserver.setupserver(ui, repo)
 
 
 def setupclient(ui, repo):
     if not isinstance(repo, localrepo.localrepository):
         return
 
     # Even clients get the server setup since they need to have the
     # wireprotocol endpoints registered.
     remotefilelogserver.onetimesetup(ui)
     onetimeclientsetup(ui)
 
     shallowrepo.wraprepo(repo)
     repo.store = shallowstore.wrapstore(repo.store)
 
 
 def storewrapper(orig, requirements, path, vfstype):
     s = orig(requirements, path, vfstype)
     if constants.SHALLOWREPO_REQUIREMENT in requirements:
         s = shallowstore.wrapstore(s)
 
     return s
 
 
 # prefetch files before update
 def applyupdates(
     orig, repo, mresult, wctx, mctx, overwrite, wantfiledata, **opts
 ):
     if isenabled(repo):
         manifest = mctx.manifest()
         files = []
         for f, args, msg in mresult.getactions([mergestatemod.ACTION_GET]):
             files.append((f, hex(manifest[f])))
         # batch fetch the needed files from the server
         repo.fileservice.prefetch(files)
     return orig(repo, mresult, wctx, mctx, overwrite, wantfiledata, **opts)
 
 
 # Prefetch merge checkunknownfiles
 def checkunknownfiles(orig, repo, wctx, mctx, force, mresult, *args, **kwargs):
     if isenabled(repo):
         files = []
         sparsematch = repo.maybesparsematch(mctx.rev())
         for f, (m, actionargs, msg) in mresult.filemap():
             if sparsematch and not sparsematch(f):
                 continue
             if m in (
                 mergestatemod.ACTION_CREATED,
                 mergestatemod.ACTION_DELETED_CHANGED,
                 mergestatemod.ACTION_CREATED_MERGE,
             ):
                 files.append((f, hex(mctx.filenode(f))))
             elif m == mergestatemod.ACTION_LOCAL_DIR_RENAME_GET:
                 f2 = actionargs[0]
                 files.append((f2, hex(mctx.filenode(f2))))
         # batch fetch the needed files from the server
         repo.fileservice.prefetch(files)
     return orig(repo, wctx, mctx, force, mresult, *args, **kwargs)
 
 
 # Prefetch files before status attempts to look at their size and contents
 def checklookup(orig, self, files, mtime_boundary):
     repo = self._repo
     if isenabled(repo):
         prefetchfiles = []
         for parent in self._parents:
             for f in files:
                 if f in parent:
                     prefetchfiles.append((f, hex(parent.filenode(f))))
         # batch fetch the needed files from the server
         repo.fileservice.prefetch(prefetchfiles)
     return orig(self, files, mtime_boundary)
 
 
 # Prefetch the logic that compares added and removed files for renames
 def findrenames(orig, repo, matcher, added, removed, *args, **kwargs):
     if isenabled(repo):
         files = []
         pmf = repo[b'.'].manifest()
         for f in removed:
             if f in pmf:
                 files.append((f, hex(pmf[f])))
         # batch fetch the needed files from the server
         repo.fileservice.prefetch(files)
     return orig(repo, matcher, added, removed, *args, **kwargs)
 
 
 # prefetch files before pathcopies check
 def computeforwardmissing(orig, a, b, match=None):
     missing = orig(a, b, match=match)
     repo = a._repo
     if isenabled(repo):
         mb = b.manifest()
 
         files = []
         sparsematch = repo.maybesparsematch(b.rev())
         if sparsematch:
             sparsemissing = set()
             for f in missing:
                 if sparsematch(f):
                     files.append((f, hex(mb[f])))
                     sparsemissing.add(f)
             missing = sparsemissing
 
         # batch fetch the needed files from the server
         repo.fileservice.prefetch(files)
     return missing
 
 
 # close cache miss server connection after the command has finished
 def runcommand(orig, lui, repo, *args, **kwargs):
     fileservice = None
     # repo can be None when running in chg:
     # - at startup, reposetup was called because serve is not norepo
     # - a norepo command like "help" is called
     if repo and isenabled(repo):
         fileservice = repo.fileservice
     try:
         return orig(lui, repo, *args, **kwargs)
     finally:
         if fileservice:
             fileservice.close()
 
 
 # prevent strip from stripping remotefilelogs
 def _collectbrokencsets(orig, repo, files, striprev):
     if isenabled(repo):
         files = list([f for f in files if not repo.shallowmatch(f)])
     return orig(repo, files, striprev)
 
 
 # changectx wrappers
 def filectx(orig, self, path, fileid=None, filelog=None):
     if fileid is None:
         fileid = self.filenode(path)
     if isenabled(self._repo) and self._repo.shallowmatch(path):
         return remotefilectx.remotefilectx(
             self._repo, path, fileid=fileid, changectx=self, filelog=filelog
         )
     return orig(self, path, fileid=fileid, filelog=filelog)
 
 
 def workingfilectx(orig, self, path, filelog=None):
     if isenabled(self._repo) and self._repo.shallowmatch(path):
         return remotefilectx.remoteworkingfilectx(
             self._repo, path, workingctx=self, filelog=filelog
         )
     return orig(self, path, filelog=filelog)
 
 
 # prefetch required revisions before a diff
 def trydiff(
     orig,
     repo,
     revs,
     ctx1,
     ctx2,
     modified,
     added,
     removed,
     copy,
     getfilectx,
     *args,
     **kwargs
 ):
     if isenabled(repo):
         prefetch = []
         mf1 = ctx1.manifest()
         for fname in modified + added + removed:
             if fname in mf1:
                 fnode = getfilectx(fname, ctx1).filenode()
                 # fnode can be None if it's a edited working ctx file
                 if fnode:
                     prefetch.append((fname, hex(fnode)))
             if fname not in removed:
                 fnode = getfilectx(fname, ctx2).filenode()
                 if fnode:
                     prefetch.append((fname, hex(fnode)))
 
         repo.fileservice.prefetch(prefetch)
 
     return orig(
         repo,
         revs,
         ctx1,
         ctx2,
         modified,
         added,
         removed,
         copy,
         getfilectx,
         *args,
         **kwargs
     )
 
 
 # Prevent verify from processing files
 # a stub for mercurial.hg.verify()
 def _verify(orig, repo, level=None):
     lock = repo.lock()
     try:
         return shallowverifier.shallowverifier(repo).verify()
     finally:
         lock.release()
 
 
 clientonetime = False
 
 
 def onetimeclientsetup(ui):
     global clientonetime
     if clientonetime:
         return
     clientonetime = True
 
     # Don't commit filelogs until we know the commit hash, since the hash
     # is present in the filelog blob.
     # This violates Mercurial's filelog->manifest->changelog write order,
     # but is generally fine for client repos.
     pendingfilecommits = []
 
     def addrawrevision(
         orig,
         self,
         rawtext,
         transaction,
         link,
         p1,
         p2,
         node,
         flags,
         cachedelta=None,
         _metatuple=None,
     ):
         if isinstance(link, int):
             pendingfilecommits.append(
                 (
                     self,
                     rawtext,
                     transaction,
                     link,
                     p1,
                     p2,
                     node,
                     flags,
                     cachedelta,
                     _metatuple,
                 )
             )
             return node
         else:
             return orig(
                 self,
                 rawtext,
                 transaction,
                 link,
                 p1,
                 p2,
                 node,
                 flags,
                 cachedelta,
                 _metatuple=_metatuple,
             )
 
     extensions.wrapfunction(
         remotefilelog.remotefilelog, 'addrawrevision', addrawrevision
     )
 
     def changelogadd(orig, self, *args, **kwargs):
         oldlen = len(self)
         node = orig(self, *args, **kwargs)
         newlen = len(self)
         if oldlen != newlen:
             for oldargs in pendingfilecommits:
                 log, rt, tr, link, p1, p2, n, fl, c, m = oldargs
                 linknode = self.node(link)
                 if linknode == node:
                     log.addrawrevision(rt, tr, linknode, p1, p2, n, fl, c, m)
                 else:
                     raise error.ProgrammingError(
                         b'pending multiple integer revisions are not supported'
                     )
         else:
             # "link" is actually wrong here (it is set to len(changelog))
             # if changelog remains unchanged, skip writing file revisions
             # but still do a sanity check about pending multiple revisions
             if len({x[3] for x in pendingfilecommits}) > 1:
                 raise error.ProgrammingError(
                     b'pending multiple integer revisions are not supported'
                 )
         del pendingfilecommits[:]
         return node
 
     extensions.wrapfunction(changelog.changelog, 'add', changelogadd)
 
 
 def getrenamedfn(orig, repo, endrev=None):
     if not isenabled(repo) or copies.usechangesetcentricalgo(repo):
         return orig(repo, endrev)
 
     rcache = {}
 
     def getrenamed(fn, rev):
         """looks up all renames for a file (up to endrev) the first
         time the file is given. It indexes on the changerev and only
         parses the manifest if linkrev != changerev.
         Returns rename info for fn at changerev rev."""
         if rev in rcache.setdefault(fn, {}):
             return rcache[fn][rev]
 
         try:
             fctx = repo[rev].filectx(fn)
             for ancestor in fctx.ancestors():
                 if ancestor.path() == fn:
                     renamed = ancestor.renamed()
                     rcache[fn][ancestor.rev()] = renamed and renamed[0]
 
             renamed = fctx.renamed()
             return renamed and renamed[0]
         except error.LookupError:
             return None
 
     return getrenamed
 
 
 def filelogrevset(orig, repo, subset, x):
     """``filelog(pattern)``
     Changesets connected to the specified filelog.
 
     For performance reasons, ``filelog()`` does not show every changeset
     that affects the requested file(s). See :hg:`help log` for details. For
     a slower, more accurate result, use ``file()``.
     """
 
     if not isenabled(repo):
         return orig(repo, subset, x)
 
     # i18n: "filelog" is a keyword
     pat = revset.getstring(x, _(b"filelog requires a pattern"))
     m = matchmod.match(
         repo.root, repo.getcwd(), [pat], default=b'relpath', ctx=repo[None]
     )
     s = set()
 
     if not matchmod.patkind(pat):
         # slow
         for r in subset:
             ctx = repo[r]
             cfiles = ctx.files()
             for f in m.files():
                 if f in cfiles:
                     s.add(ctx.rev())
                     break
     else:
         # partial
         files = (f for f in repo[None] if m(f))
         for f in files:
             fctx = repo[None].filectx(f)
             s.add(fctx.linkrev())
             for actx in fctx.ancestors():
                 s.add(actx.linkrev())
 
     return smartset.baseset([r for r in subset if r in s])
 
 
 @command(b'gc', [], _(b'hg gc [REPO...]'), norepo=True)
 def gc(ui, *args, **opts):
     """garbage collect the client and server filelog caches"""
     cachepaths = set()
 
     # get the system client cache
     systemcache = shallowutil.getcachepath(ui, allowempty=True)
     if systemcache:
         cachepaths.add(systemcache)
 
     # get repo client and server cache
     repopaths = []
     pwd = ui.environ.get(b'PWD')
     if pwd:
         repopaths.append(pwd)
 
     repopaths.extend(args)
     repos = []
     for repopath in repopaths:
         try:
             repo = hg.peer(ui, {}, repopath)
             repos.append(repo)
 
             repocache = shallowutil.getcachepath(repo.ui, allowempty=True)
             if repocache:
                 cachepaths.add(repocache)
         except error.RepoError:
             pass
 
     # gc client cache
     for cachepath in cachepaths:
         gcclient(ui, cachepath)
 
     # gc server cache
     for repo in repos:
         remotefilelogserver.gcserver(ui, repo._repo)
 
 
 def gcclient(ui, cachepath):
     # get list of repos that use this cache
     repospath = os.path.join(cachepath, b'repos')
     if not os.path.exists(repospath):
         ui.warn(_(b"no known cache at %s\n") % cachepath)
         return
 
     reposfile = open(repospath, b'rb')
     repos = {r[:-1] for r in reposfile.readlines()}
     reposfile.close()
 
     # build list of useful files
     validrepos = []
     keepkeys = set()
 
     sharedcache = None
     filesrepacked = False
 
     count = 0
     progress = ui.makeprogress(
         _(b"analyzing repositories"), unit=b"repos", total=len(repos)
     )
     for path in repos:
         progress.update(count)
         count += 1
         try:
             path = util.expandpath(os.path.normpath(path))
         except TypeError as e:
             ui.warn(_(b"warning: malformed path: %r:%s\n") % (path, e))
             traceback.print_exc()
             continue
         try:
             peer = hg.peer(ui, {}, path)
             repo = peer._repo
         except error.RepoError:
             continue
 
         validrepos.append(path)
 
         # Protect against any repo or config changes that have happened since
         # this repo was added to the repos file. We'd rather this loop succeed
         # and too much be deleted, than the loop fail and nothing gets deleted.
         if not isenabled(repo):
             continue
 
-        if not util.safehasattr(repo, b'name'):
+        if not util.safehasattr(repo, 'name'):
             ui.warn(
                 _(b"repo %s is a misconfigured remotefilelog repo\n") % path
             )
             continue
 
         # If garbage collection on repack and repack on hg gc are enabled
         # then loose files are repacked and garbage collected.
         # Otherwise regular garbage collection is performed.
         repackonhggc = repo.ui.configbool(b'remotefilelog', b'repackonhggc')
         gcrepack = repo.ui.configbool(b'remotefilelog', b'gcrepack')
         if repackonhggc and gcrepack:
             try:
                 repackmod.incrementalrepack(repo)
                 filesrepacked = True
                 continue
             except (IOError, repackmod.RepackAlreadyRunning):
                 # If repack cannot be performed due to not enough disk space
                 # continue doing garbage collection of loose files w/o repack
                 pass
 
         reponame = repo.name
         if not sharedcache:
             sharedcache = repo.sharedstore
 
         # Compute a keepset which is not garbage collected
         def keyfn(fname, fnode):
             return fileserverclient.getcachekey(reponame, fname, hex(fnode))
 
         keepkeys = repackmod.keepset(repo, keyfn=keyfn, lastkeepkeys=keepkeys)
 
     progress.complete()
 
     # write list of valid repos back
     oldumask = os.umask(0o002)
     try:
         reposfile = open(repospath, b'wb')
         reposfile.writelines([(b"%s\n" % r) for r in validrepos])
         reposfile.close()
     finally:
         os.umask(oldumask)
 
     # prune cache
     if sharedcache is not None:
         sharedcache.gc(keepkeys)
     elif not filesrepacked:
         ui.warn(_(b"warning: no valid repos in repofile\n"))
 
 
 def log(orig, ui, repo, *pats, **opts):
     if not isenabled(repo):
         return orig(ui, repo, *pats, **opts)
 
     follow = opts.get('follow')
     revs = opts.get('rev')
     if pats:
         # Force slowpath for non-follow patterns and follows that start from
         # non-working-copy-parent revs.
         if not follow or revs:
             # This forces the slowpath
             opts['removed'] = True
 
         # If this is a non-follow log without any revs specified, recommend that
         # the user add -f to speed it up.
         if not follow and not revs:
             match = scmutil.match(repo[b'.'], pats, pycompat.byteskwargs(opts))
             isfile = not match.anypats()
             if isfile:
                 for file in match.files():
                     if not os.path.isfile(repo.wjoin(file)):
                         isfile = False
                         break
 
             if isfile:
                 ui.warn(
                     _(
                         b"warning: file log can be slow on large repos - "
                         + b"use -f to speed it up\n"
                     )
                 )
 
     return orig(ui, repo, *pats, **opts)
 
 
 def revdatelimit(ui, revset):
     """Update revset so that only changesets no older than 'prefetchdays' days
     are included. The default value is set to 14 days. If 'prefetchdays' is set
     to zero or negative value then date restriction is not applied.
     """
     days = ui.configint(b'remotefilelog', b'prefetchdays')
     if days > 0:
         revset = b'(%s) & date(-%s)' % (revset, days)
     return revset
 
 
 def readytofetch(repo):
     """Check that enough time has passed since the last background prefetch.
     This only relates to prefetches after operations that change the working
     copy parent. Default delay between background prefetches is 2 minutes.
     """
     timeout = repo.ui.configint(b'remotefilelog', b'prefetchdelay')
     fname = repo.vfs.join(b'lastprefetch')
 
     ready = False
     with open(fname, b'a'):
         # the with construct above is used to avoid race conditions
         modtime = os.path.getmtime(fname)
         if (time.time() - modtime) > timeout:
             os.utime(fname, None)
             ready = True
 
     return ready
 
 
 def wcpprefetch(ui, repo, **kwargs):
     """Prefetches in background revisions specified by bgprefetchrevs revset.
     Does background repack if backgroundrepack flag is set in config.
     """
     shallow = isenabled(repo)
     bgprefetchrevs = ui.config(b'remotefilelog', b'bgprefetchrevs')
     isready = readytofetch(repo)
 
     if not (shallow and bgprefetchrevs and isready):
         return
 
     bgrepack = repo.ui.configbool(b'remotefilelog', b'backgroundrepack')
     # update a revset with a date limit
     bgprefetchrevs = revdatelimit(ui, bgprefetchrevs)
 
     def anon(unused_success):
-        if util.safehasattr(repo, b'ranprefetch') and repo.ranprefetch:
+        if util.safehasattr(repo, 'ranprefetch') and repo.ranprefetch:
             return
         repo.ranprefetch = True
         repo.backgroundprefetch(bgprefetchrevs, repack=bgrepack)
 
     repo._afterlock(anon)
 
 
 def pull(orig, ui, repo, *pats, **opts):
     result = orig(ui, repo, *pats, **opts)
 
     if isenabled(repo):
         # prefetch if it's configured
         prefetchrevset = ui.config(b'remotefilelog', b'pullprefetch')
         bgrepack = repo.ui.configbool(b'remotefilelog', b'backgroundrepack')
         bgprefetch = repo.ui.configbool(b'remotefilelog', b'backgroundprefetch')
 
         if prefetchrevset:
             ui.status(_(b"prefetching file contents\n"))
             revs = scmutil.revrange(repo, [prefetchrevset])
             base = repo[b'.'].rev()
             if bgprefetch:
                 repo.backgroundprefetch(prefetchrevset, repack=bgrepack)
             else:
                 repo.prefetch(revs, base=base)
                 if bgrepack:
                     repackmod.backgroundrepack(repo, incremental=True)
         elif bgrepack:
             repackmod.backgroundrepack(repo, incremental=True)
 
     return result
 
 
 def exchangepull(orig, repo, remote, *args, **kwargs):
     # Hook into the callstream/getbundle to insert bundle capabilities
     # during a pull.
     def localgetbundle(
         orig, source, heads=None, common=None, bundlecaps=None, **kwargs
     ):
         if not bundlecaps:
             bundlecaps = set()
         bundlecaps.add(constants.BUNDLE2_CAPABLITY)
         return orig(
             source, heads=heads, common=common, bundlecaps=bundlecaps, **kwargs
         )
 
-    if util.safehasattr(remote, b'_callstream'):
+    if util.safehasattr(remote, '_callstream'):
         remote._localrepo = repo
-    elif util.safehasattr(remote, b'getbundle'):
+    elif util.safehasattr(remote, 'getbundle'):
         extensions.wrapfunction(remote, 'getbundle', localgetbundle)
 
     return orig(repo, remote, *args, **kwargs)
 
 
 def _fileprefetchhook(repo, revmatches):
     if isenabled(repo):
         allfiles = []
         for rev, match in revmatches:
             if rev == wdirrev or rev is None:
                 continue
             ctx = repo[rev]
             mf = ctx.manifest()
             sparsematch = repo.maybesparsematch(ctx.rev())
             for path in ctx.walk(match):
                 if (not sparsematch or sparsematch(path)) and path in mf:
                     allfiles.append((path, hex(mf[path])))
         repo.fileservice.prefetch(allfiles)
 
 
 @command(
     b'debugremotefilelog',
     [
         (b'd', b'decompress', None, _(b'decompress the filelog first')),
     ],
     _(b'hg debugremotefilelog <path>'),
     norepo=True,
 )
 def debugremotefilelog(ui, path, **opts):
     return debugcommands.debugremotefilelog(ui, path, **opts)
 
 
 @command(
     b'verifyremotefilelog',
     [
         (b'd', b'decompress', None, _(b'decompress the filelogs first')),
     ],
     _(b'hg verifyremotefilelogs <directory>'),
     norepo=True,
 )
 def verifyremotefilelog(ui, path, **opts):
     return debugcommands.verifyremotefilelog(ui, path, **opts)
 
 
 @command(
     b'debugdatapack',
     [
         (b'', b'long', None, _(b'print the long hashes')),
         (b'', b'node', b'', _(b'dump the contents of node'), b'NODE'),
     ],
     _(b'hg debugdatapack <paths>'),
     norepo=True,
 )
 def debugdatapack(ui, *paths, **opts):
     return debugcommands.debugdatapack(ui, *paths, **opts)
 
 
 @command(b'debughistorypack', [], _(b'hg debughistorypack <path>'), norepo=True)
 def debughistorypack(ui, path, **opts):
     return debugcommands.debughistorypack(ui, path)
 
 
 @command(b'debugkeepset', [], _(b'hg debugkeepset'))
 def debugkeepset(ui, repo, **opts):
     # The command is used to measure keepset computation time
     def keyfn(fname, fnode):
         return fileserverclient.getcachekey(repo.name, fname, hex(fnode))
 
     repackmod.keepset(repo, keyfn)
     return
 
 
 @command(b'debugwaitonrepack', [], _(b'hg debugwaitonrepack'))
 def debugwaitonrepack(ui, repo, **opts):
     return debugcommands.debugwaitonrepack(repo)
 
 
 @command(b'debugwaitonprefetch', [], _(b'hg debugwaitonprefetch'))
 def debugwaitonprefetch(ui, repo, **opts):
     return debugcommands.debugwaitonprefetch(repo)
 
 
 def resolveprefetchopts(ui, opts):
     if not opts.get(b'rev'):
         revset = [b'.', b'draft()']
 
         prefetchrevset = ui.config(b'remotefilelog', b'pullprefetch', None)
         if prefetchrevset:
             revset.append(b'(%s)' % prefetchrevset)
         bgprefetchrevs = ui.config(b'remotefilelog', b'bgprefetchrevs', None)
         if bgprefetchrevs:
             revset.append(b'(%s)' % bgprefetchrevs)
         revset = b'+'.join(revset)
 
         # update a revset with a date limit
         revset = revdatelimit(ui, revset)
 
         opts[b'rev'] = [revset]
 
     if not opts.get(b'base'):
         opts[b'base'] = None
 
     return opts
 
 
 @command(
     b'prefetch',
     [
         (b'r', b'rev', [], _(b'prefetch the specified revisions'), _(b'REV')),
         (b'', b'repack', False, _(b'run repack after prefetch')),
         (b'b', b'base', b'', _(b"rev that is assumed to already be local")),
     ]
     + commands.walkopts,
     _(b'hg prefetch [OPTIONS] [FILE...]'),
     helpcategory=command.CATEGORY_MAINTENANCE,
 )
 def prefetch(ui, repo, *pats, **opts):
     """prefetch file revisions from the server
 
     Prefetchs file revisions for the specified revs and stores them in the
     local remotefilelog cache.  If no rev is specified, the default rev is
     used which is the union of dot, draft, pullprefetch and bgprefetchrev.
     File names or patterns can be used to limit which files are downloaded.
 
     Return 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
     if not isenabled(repo):
         raise error.Abort(_(b"repo is not shallow"))
 
     opts = resolveprefetchopts(ui, opts)
     revs = scmutil.revrange(repo, opts.get(b'rev'))
     repo.prefetch(revs, opts.get(b'base'), pats, opts)
 
     # Run repack in background
     if opts.get(b'repack'):
         repackmod.backgroundrepack(repo, incremental=True)
 
 
 @command(
     b'repack',
     [
         (b'', b'background', None, _(b'run in a background process'), None),
         (b'', b'incremental', None, _(b'do an incremental repack'), None),
         (
             b'',
             b'packsonly',
             None,
             _(b'only repack packs (skip loose objects)'),
             None,
         ),
     ],
     _(b'hg repack [OPTIONS]'),
 )
 def repack_(ui, repo, *pats, **opts):
     if opts.get('background'):
         repackmod.backgroundrepack(
             repo,
             incremental=opts.get('incremental'),
             packsonly=opts.get('packsonly', False),
         )
         return
 
     options = {b'packsonly': opts.get('packsonly')}
 
     try:
         if opts.get('incremental'):
             repackmod.incrementalrepack(repo, options=options)
         else:
             repackmod.fullrepack(repo, options=options)
     except repackmod.RepackAlreadyRunning as ex:
         # Don't propogate the exception if the repack is already in
         # progress, since we want the command to exit 0.
         repo.ui.warn(b'%s\n' % ex)

hgext/remotefilelog/remotefilelogserver.py

@@ -1,446 +1,446 b''
 # remotefilelogserver.py - server logic for a remotefilelog server
 #
 # Copyright 2013 Facebook, Inc.
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 import os
 import stat
 import time
 import zlib
 
 from mercurial.i18n import _
 from mercurial.node import bin, hex
 from mercurial.pycompat import open
 from mercurial import (
     changegroup,
     changelog,
     context,
     error,
     extensions,
     match,
     scmutil,
     store,
     streamclone,
     util,
     wireprotoserver,
     wireprototypes,
     wireprotov1server,
 )
 from . import (
     constants,
     shallowutil,
 )
 
 _sshv1server = wireprotoserver.sshv1protocolhandler
 
 
 def setupserver(ui, repo):
     """Sets up a normal Mercurial repo so it can serve files to shallow repos."""
     onetimesetup(ui)
 
     # don't send files to shallow clients during pulls
     def generatefiles(
         orig, self, changedfiles, linknodes, commonrevs, source, *args, **kwargs
     ):
         caps = self._bundlecaps or []
         if constants.BUNDLE2_CAPABLITY in caps:
             # only send files that don't match the specified patterns
             includepattern = None
             excludepattern = None
             for cap in self._bundlecaps or []:
                 if cap.startswith(b"includepattern="):
                     includepattern = cap[len(b"includepattern=") :].split(b'\0')
                 elif cap.startswith(b"excludepattern="):
                     excludepattern = cap[len(b"excludepattern=") :].split(b'\0')
 
             m = match.always()
             if includepattern or excludepattern:
                 m = match.match(
                     repo.root, b'', None, includepattern, excludepattern
                 )
 
             changedfiles = list([f for f in changedfiles if not m(f)])
         return orig(
             self, changedfiles, linknodes, commonrevs, source, *args, **kwargs
         )
 
     extensions.wrapfunction(
         changegroup.cgpacker, 'generatefiles', generatefiles
     )
 
 
 onetime = False
 
 
 def onetimesetup(ui):
     """Configures the wireprotocol for both clients and servers."""
     global onetime
     if onetime:
         return
     onetime = True
 
     # support file content requests
     wireprotov1server.wireprotocommand(
         b'x_rfl_getflogheads', b'path', permission=b'pull'
     )(getflogheads)
     wireprotov1server.wireprotocommand(
         b'x_rfl_getfiles', b'', permission=b'pull'
     )(getfiles)
     wireprotov1server.wireprotocommand(
         b'x_rfl_getfile', b'file node', permission=b'pull'
     )(getfile)
 
     class streamstate:
         match = None
         shallowremote = False
         noflatmf = False
 
     state = streamstate()
 
     def stream_out_shallow(repo, proto, other):
         includepattern = None
         excludepattern = None
         raw = other.get(b'includepattern')
         if raw:
             includepattern = raw.split(b'\0')
         raw = other.get(b'excludepattern')
         if raw:
             excludepattern = raw.split(b'\0')
 
         oldshallow = state.shallowremote
         oldmatch = state.match
         oldnoflatmf = state.noflatmf
         try:
             state.shallowremote = True
             state.match = match.always()
             state.noflatmf = other.get(b'noflatmanifest') == b'True'
             if includepattern or excludepattern:
                 state.match = match.match(
                     repo.root, b'', None, includepattern, excludepattern
                 )
             streamres = wireprotov1server.stream(repo, proto)
 
             # Force the first value to execute, so the file list is computed
             # within the try/finally scope
             first = next(streamres.gen)
             second = next(streamres.gen)
 
             def gen():
                 yield first
                 yield second
                 for value in streamres.gen:
                     yield value
 
             return wireprototypes.streamres(gen())
         finally:
             state.shallowremote = oldshallow
             state.match = oldmatch
             state.noflatmf = oldnoflatmf
 
     wireprotov1server.commands[b'stream_out_shallow'] = (
         stream_out_shallow,
         b'*',
     )
 
     # don't clone filelogs to shallow clients
     def _walkstreamfiles(
         orig, repo, matcher=None, phase=False, obsolescence=False
     ):
         if state.shallowremote:
             # if we are shallow ourselves, stream our local commits
             if shallowutil.isenabled(repo):
                 striplen = len(repo.store.path) + 1
                 readdir = repo.store.rawvfs.readdir
                 visit = [os.path.join(repo.store.path, b'data')]
                 while visit:
                     p = visit.pop()
                     for f, kind, st in readdir(p, stat=True):
                         fp = p + b'/' + f
                         if kind == stat.S_IFREG:
                             if not fp.endswith(b'.i') and not fp.endswith(
                                 b'.d'
                             ):
                                 n = util.pconvert(fp[striplen:])
                                 d = store.decodedir(n)
                                 yield store.SimpleStoreEntry(
                                     entry_path=d,
                                     is_volatile=False,
                                     file_size=st.st_size,
                                 )
 
                         if kind == stat.S_IFDIR:
                             visit.append(fp)
 
             if scmutil.istreemanifest(repo):
                 for entry in repo.store.data_entries():
                     if not entry.is_revlog:
                         continue
                     if entry.is_manifestlog:
                         yield entry
 
             # Return .d and .i files that do not match the shallow pattern
             match = state.match
             if match and not match.always():
                 for entry in repo.store.data_entries():
                     if not entry.is_revlog:
                         continue
                     if not state.match(entry.target_id):
                         yield entry
 
             for x in repo.store.top_entries():
                 if state.noflatmf and x[1][:11] == b'00manifest.':
                     continue
                 yield x
 
         elif shallowutil.isenabled(repo):
             # don't allow cloning from a shallow repo to a full repo
             # since it would require fetching every version of every
             # file in order to create the revlogs.
             raise error.Abort(
                 _(b"Cannot clone from a shallow repo to a full repo.")
             )
         else:
             for x in orig(
                 repo, matcher, phase=phase, obsolescence=obsolescence
             ):
                 yield x
 
     extensions.wrapfunction(streamclone, '_walkstreamfiles', _walkstreamfiles)
 
     # expose remotefilelog capabilities
     def _capabilities(orig, repo, proto):
         caps = orig(repo, proto)
         if shallowutil.isenabled(repo) or ui.configbool(
             b'remotefilelog', b'server'
         ):
             if isinstance(proto, _sshv1server):
                 # legacy getfiles method which only works over ssh
                 caps.append(constants.NETWORK_CAP_LEGACY_SSH_GETFILES)
             caps.append(b'x_rfl_getflogheads')
             caps.append(b'x_rfl_getfile')
         return caps
 
     extensions.wrapfunction(wireprotov1server, '_capabilities', _capabilities)
 
     def _adjustlinkrev(orig, self, *args, **kwargs):
         # When generating file blobs, taking the real path is too slow on large
         # repos, so force it to just return the linkrev directly.
         repo = self._repo
-        if util.safehasattr(repo, b'forcelinkrev') and repo.forcelinkrev:
+        if util.safehasattr(repo, 'forcelinkrev') and repo.forcelinkrev:
             return self._filelog.linkrev(self._filelog.rev(self._filenode))
         return orig(self, *args, **kwargs)
 
     extensions.wrapfunction(
         context.basefilectx, '_adjustlinkrev', _adjustlinkrev
     )
 
     def _iscmd(orig, cmd):
         if cmd == b'x_rfl_getfiles':
             return False
         return orig(cmd)
 
     extensions.wrapfunction(wireprotoserver, 'iscmd', _iscmd)
 
 
 def _loadfileblob(repo, cachepath, path, node):
     filecachepath = os.path.join(cachepath, path, hex(node))
     if not os.path.exists(filecachepath) or os.path.getsize(filecachepath) == 0:
         filectx = repo.filectx(path, fileid=node)
         if filectx.node() == repo.nullid:
             repo.changelog = changelog.changelog(repo.svfs)
             filectx = repo.filectx(path, fileid=node)
 
         text = createfileblob(filectx)
         # TODO configurable compression engines
         text = zlib.compress(text)
 
         # everything should be user & group read/writable
         oldumask = os.umask(0o002)
         try:
             dirname = os.path.dirname(filecachepath)
             if not os.path.exists(dirname):
                 try:
                     os.makedirs(dirname)
                 except FileExistsError:
                     pass
 
             f = None
             try:
                 f = util.atomictempfile(filecachepath, b"wb")
                 f.write(text)
             except (IOError, OSError):
                 # Don't abort if the user only has permission to read,
                 # and not write.
                 pass
             finally:
                 if f:
                     f.close()
         finally:
             os.umask(oldumask)
     else:
         with open(filecachepath, b"rb") as f:
             text = f.read()
     return text
 
 
 def getflogheads(repo, proto, path):
     """A server api for requesting a filelog's heads"""
     flog = repo.file(path)
     heads = flog.heads()
     return b'\n'.join((hex(head) for head in heads if head != repo.nullid))
 
 
 def getfile(repo, proto, file, node):
     """A server api for requesting a particular version of a file. Can be used
     in batches to request many files at once. The return protocol is:
     <errorcode>\0<data/errormsg> where <errorcode> is 0 for success or
     non-zero for an error.
 
     data is a compressed blob with revlog flag and ancestors information. See
     createfileblob for its content.
     """
     if shallowutil.isenabled(repo):
         return b'1\0' + _(b'cannot fetch remote files from shallow repo')
     cachepath = repo.ui.config(b"remotefilelog", b"servercachepath")
     if not cachepath:
         cachepath = os.path.join(repo.path, b"remotefilelogcache")
     node = bin(node.strip())
     if node == repo.nullid:
         return b'0\0'
     return b'0\0' + _loadfileblob(repo, cachepath, file, node)
 
 
 def getfiles(repo, proto):
     """A server api for requesting particular versions of particular files."""
     if shallowutil.isenabled(repo):
         raise error.Abort(_(b'cannot fetch remote files from shallow repo'))
     if not isinstance(proto, _sshv1server):
         raise error.Abort(_(b'cannot fetch remote files over non-ssh protocol'))
 
     def streamer():
         fin = proto._fin
 
         cachepath = repo.ui.config(b"remotefilelog", b"servercachepath")
         if not cachepath:
             cachepath = os.path.join(repo.path, b"remotefilelogcache")
 
         while True:
             request = fin.readline()[:-1]
             if not request:
                 break
 
             node = bin(request[:40])
             if node == repo.nullid:
                 yield b'0\n'
                 continue
 
             path = request[40:]
 
             text = _loadfileblob(repo, cachepath, path, node)
 
             yield b'%d\n%s' % (len(text), text)
 
             # it would be better to only flush after processing a whole batch
             # but currently we don't know if there are more requests coming
             proto._fout.flush()
 
     return wireprototypes.streamres(streamer())
 
 
 def createfileblob(filectx):
     """
     format:
         v0:
             str(len(rawtext)) + '\0' + rawtext + ancestortext
         v1:
             'v1' + '\n' + metalist + '\0' + rawtext + ancestortext
             metalist := metalist + '\n' + meta | meta
             meta := sizemeta | flagmeta
             sizemeta := METAKEYSIZE + str(len(rawtext))
             flagmeta := METAKEYFLAG + str(flag)
 
             note: sizemeta must exist. METAKEYFLAG and METAKEYSIZE must have a
             length of 1.
     """
     flog = filectx.filelog()
     frev = filectx.filerev()
     revlogflags = flog._revlog.flags(frev)
     if revlogflags == 0:
         # normal files
         text = filectx.data()
     else:
         # lfs, read raw revision data
         text = flog.rawdata(frev)
 
     repo = filectx._repo
 
     ancestors = [filectx]
 
     try:
         repo.forcelinkrev = True
         ancestors.extend([f for f in filectx.ancestors()])
 
         ancestortext = b""
         for ancestorctx in ancestors:
             parents = ancestorctx.parents()
             p1 = repo.nullid
             p2 = repo.nullid
             if len(parents) > 0:
                 p1 = parents[0].filenode()
             if len(parents) > 1:
                 p2 = parents[1].filenode()
 
             copyname = b""
             rename = ancestorctx.renamed()
             if rename:
                 copyname = rename[0]
             linknode = ancestorctx.node()
             ancestortext += b"%s%s%s%s%s\0" % (
                 ancestorctx.filenode(),
                 p1,
                 p2,
                 linknode,
                 copyname,
             )
     finally:
         repo.forcelinkrev = False
 
     header = shallowutil.buildfileblobheader(len(text), revlogflags)
 
     return b"%s\0%s%s" % (header, text, ancestortext)
 
 
 def gcserver(ui, repo):
     if not repo.ui.configbool(b"remotefilelog", b"server"):
         return
 
     neededfiles = set()
     heads = repo.revs(b"heads(tip~25000:) - null")
 
     cachepath = repo.vfs.join(b"remotefilelogcache")
     for head in heads:
         mf = repo[head].manifest()
         for filename, filenode in mf.items():
             filecachepath = os.path.join(cachepath, filename, hex(filenode))
             neededfiles.add(filecachepath)
 
     # delete unneeded older files
     days = repo.ui.configint(b"remotefilelog", b"serverexpiration")
     expiration = time.time() - (days * 24 * 60 * 60)
 
     progress = ui.makeprogress(_(b"removing old server cache"), unit=b"files")
     progress.update(0)
     for root, dirs, files in os.walk(cachepath):
         for file in files:
             filepath = os.path.join(root, file)
             progress.increment()
             if filepath in neededfiles:
                 continue
 
             stat = os.stat(filepath)
             if stat.st_mtime < expiration:
                 os.remove(filepath)
 
     progress.complete()