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839e1372bd
I would like to make an extension that replaces one of the layers (by replacing makecachestores) with a layer that reads from an existing machine-local caching system. This would speed up my accesses a lot and reduce a lot of duplication on my disk.
259 lines
10 KiB
Python
259 lines
10 KiB
Python
# shallowrepo.py - shallow repository that uses remote filelogs
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#
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# Copyright 2013 Facebook, Inc.
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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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from mercurial.i18n import _
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from mercurial.node import hex, nullid, nullrev
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from mercurial import localrepo, util, match, scmutil
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from . import remotefilelog, remotefilectx, fileserverclient
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import constants, shallowutil
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from contentstore import remotefilelogcontentstore, unioncontentstore
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from contentstore import remotecontentstore
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from metadatastore import remotefilelogmetadatastore, unionmetadatastore
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from metadatastore import remotemetadatastore
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from datapack import datapackstore
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from historypack import historypackstore
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import os
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requirement = "remotefilelog"
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_prefetching = _('prefetching')
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# These make*stores functions are global so that other extensions can replace
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# them.
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def makelocalstores(repo):
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"""In-repo stores, like .hg/store/data; can not be discarded."""
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localpath = os.path.join(repo.svfs.vfs.base, 'data')
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if not os.path.exists(localpath):
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os.makedirs(localpath)
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# Instantiate local data stores
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localcontent = remotefilelogcontentstore(repo, localpath, repo.name,
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shared=False)
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localmetadata = remotefilelogmetadatastore(repo, localpath, repo.name,
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shared=False)
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return localcontent, localmetadata
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def makecachestores(repo):
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"""Typically machine-wide, cache of remote data; can be discarded."""
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# Instantiate shared cache stores
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cachepath = shallowutil.getcachepath(repo.ui)
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cachecontent = remotefilelogcontentstore(repo, cachepath, repo.name,
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shared=True)
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cachemetadata = remotefilelogmetadatastore(repo, cachepath, repo.name,
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shared=True)
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repo.sharedstore = cachecontent
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repo.shareddatastores.append(cachecontent)
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repo.sharedhistorystores.append(cachemetadata)
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return cachecontent, cachemetadata
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def makeremotestores(repo, cachecontent, cachemetadata):
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"""These stores fetch data from a remote server."""
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# Instantiate remote stores
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repo.fileservice = fileserverclient.fileserverclient(repo)
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remotecontent = remotecontentstore(repo.ui, repo.fileservice,
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cachecontent)
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remotemetadata = remotemetadatastore(repo.ui, repo.fileservice,
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cachemetadata)
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return remotecontent, remotemetadata
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def makepackstores(repo):
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"""Packs are more efficient (to read from) cache stores."""
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# Instantiate pack stores
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packpath = shallowutil.getcachepackpath(repo,
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constants.FILEPACK_CATEGORY)
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packcontentstore = datapackstore(
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repo.ui,
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packpath,
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usecdatapack=repo.ui.configbool('remotefilelog', 'fastdatapack'))
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packmetadatastore = historypackstore(repo.ui, packpath)
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repo.shareddatastores.append(packcontentstore)
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repo.sharedhistorystores.append(packmetadatastore)
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return packcontentstore, packmetadatastore
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def makeunionstores(repo):
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"""Union stores iterate the other stores and return the first result."""
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repo.shareddatastores = []
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repo.sharedhistorystores = []
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packcontentstore, packmetadatastore = makepackstores(repo)
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cachecontent, cachemetadata = makecachestores(repo)
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localcontent, localmetadata = makelocalstores(repo)
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remotecontent, remotemetadata = makeremotestores(repo, cachecontent,
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cachemetadata)
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# Instantiate union stores
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repo.contentstore = unioncontentstore(packcontentstore, cachecontent,
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localcontent, remotecontent, writestore=localcontent)
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repo.metadatastore = unionmetadatastore(packmetadatastore, cachemetadata,
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localmetadata, remotemetadata, writestore=localmetadata)
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fileservicedatawrite = cachecontent
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fileservicehistorywrite = cachecontent
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if repo.ui.configbool('remotefilelog', 'fetchpacks'):
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fileservicedatawrite = packcontentstore
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fileservicehistorywrite = packmetadatastore
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repo.fileservice.setstore(repo.contentstore, repo.metadatastore,
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fileservicedatawrite, fileservicehistorywrite)
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def wraprepo(repo):
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class shallowrepository(repo.__class__):
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@util.propertycache
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def name(self):
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return self.ui.config('remotefilelog', 'reponame', '')
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@util.propertycache
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def fallbackpath(self):
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return repo.ui.config("remotefilelog", "fallbackpath",
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# fallbackrepo is the old, deprecated name
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repo.ui.config("remotefilelog", "fallbackrepo",
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repo.ui.config("paths", "default")))
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def maybesparsematch(self, *revs, **kwargs):
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'''
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A wrapper that allows the remotefilelog to invoke sparsematch() if
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this is a sparse repository, or returns None if this is not a
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sparse repository.
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'''
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if util.safehasattr(self, 'sparsematch'):
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return self.sparsematch(*revs, **kwargs)
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return None
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def file(self, f):
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if f[0] == '/':
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f = f[1:]
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if self.shallowmatch(f):
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return remotefilelog.remotefilelog(self.svfs, f, self)
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else:
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return super(shallowrepository, self).file(f)
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def filectx(self, path, changeid=None, fileid=None):
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if self.shallowmatch(path):
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return remotefilectx.remotefilectx(self, path, changeid, fileid)
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else:
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return super(shallowrepository, self).filectx(path, changeid,
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fileid)
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@localrepo.unfilteredmethod
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def commitctx(self, ctx, error=False):
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"""Add a new revision to current repository.
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Revision information is passed via the context argument.
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"""
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# some contexts already have manifest nodes, they don't need any
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# prefetching (for example if we're just editing a commit message
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# we can reuse manifest
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if not ctx.manifestnode():
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# prefetch files that will likely be compared
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m1 = ctx.p1().manifest()
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files = []
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for f in ctx.modified() + ctx.added():
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fparent1 = m1.get(f, nullid)
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if fparent1 != nullid:
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files.append((f, hex(fparent1)))
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self.fileservice.prefetch(files)
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return super(shallowrepository, self).commitctx(ctx,
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error=error)
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def prefetch(self, revs, base=None, pats=None, opts=None):
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"""Prefetches all the necessary file revisions for the given revs
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"""
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fallbackpath = self.fallbackpath
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if fallbackpath:
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# If we know a rev is on the server, we should fetch the server
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# version of those files, since our local file versions might
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# become obsolete if the local commits are stripped.
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localrevs = repo.revs('outgoing(%s)', fallbackpath)
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if base is not None and base != nullrev:
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serverbase = list(repo.revs('first(reverse(::%s) - %ld)',
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base, localrevs))
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if serverbase:
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base = serverbase[0]
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else:
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localrevs = repo
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mfl = repo.manifestlog
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mfrevlog = mfl._revlog
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if base is not None:
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mfdict = mfl[repo[base].manifestnode()].read()
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skip = set(mfdict.iteritems())
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else:
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skip = set()
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# Copy the skip set to start large and avoid constant resizing,
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# and since it's likely to be very similar to the prefetch set.
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files = skip.copy()
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serverfiles = skip.copy()
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visited = set()
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visited.add(nullrev)
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revnum = 0
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revcount = len(revs)
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self.ui.progress(_prefetching, revnum, total=revcount)
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for rev in sorted(revs):
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ctx = repo[rev]
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if pats:
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m = scmutil.match(ctx, pats, opts)
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sparsematch = repo.maybesparsematch(rev)
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mfnode = ctx.manifestnode()
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mfrev = mfrevlog.rev(mfnode)
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# Decompressing manifests is expensive.
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# When possible, only read the deltas.
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p1, p2 = mfrevlog.parentrevs(mfrev)
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if p1 in visited and p2 in visited:
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mfdict = mfl[mfnode].readfast()
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else:
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mfdict = mfl[mfnode].read()
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diff = mfdict.iteritems()
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if pats:
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diff = (pf for pf in diff if m(pf[0]))
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if sparsematch:
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diff = (pf for pf in diff if sparsematch(pf[0]))
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if rev not in localrevs:
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serverfiles.update(diff)
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else:
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files.update(diff)
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visited.add(mfrev)
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revnum += 1
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self.ui.progress(_prefetching, revnum, total=revcount)
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files.difference_update(skip)
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serverfiles.difference_update(skip)
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self.ui.progress(_prefetching, None)
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# Fetch files known to be on the server
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if serverfiles:
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results = [(path, hex(fnode)) for (path, fnode) in serverfiles]
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repo.fileservice.prefetch(results, force=True)
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# Fetch files that may or may not be on the server
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if files:
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results = [(path, hex(fnode)) for (path, fnode) in files]
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repo.fileservice.prefetch(results)
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repo.__class__ = shallowrepository
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repo.shallowmatch = match.always(repo.root, '')
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makeunionstores(repo)
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repo.includepattern = repo.ui.configlist("remotefilelog", "includepattern",
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None)
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repo.excludepattern = repo.ui.configlist("remotefilelog", "excludepattern",
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None)
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if repo.includepattern or repo.excludepattern:
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repo.shallowmatch = match.match(repo.root, '', None,
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repo.includepattern, repo.excludepattern)
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