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# 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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import os
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from mercurial.i18n import _
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from mercurial.node import hex, nullrev
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from mercurial import (
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encoding,
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error,
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localrepo,
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match,
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scmutil,
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sparse,
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util,
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)
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from mercurial.utils import procutil
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from . import (
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connectionpool,
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constants,
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contentstore,
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datapack,
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fileserverclient,
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historypack,
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metadatastore,
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remotefilectx,
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remotefilelog,
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shallowutil,
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)
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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, b'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 = contentstore.remotefilelogcontentstore(
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repo, localpath, repo.name, shared=False
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)
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localmetadata = metadatastore.remotefilelogmetadatastore(
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repo, localpath, repo.name, shared=False
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)
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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 = contentstore.remotefilelogcontentstore(
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repo, cachepath, repo.name, shared=True
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)
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cachemetadata = metadatastore.remotefilelogmetadatastore(
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repo, cachepath, repo.name, shared=True
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)
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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 = contentstore.remotecontentstore(
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repo.ui, repo.fileservice, cachecontent
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)
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remotemetadata = metadatastore.remotemetadatastore(
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repo.ui, repo.fileservice, cachemetadata
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)
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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, constants.FILEPACK_CATEGORY)
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packcontentstore = datapack.datapackstore(repo.ui, packpath)
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packmetadatastore = historypack.historypackstore(repo.ui, packpath)
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repo.shareddatastores.append(packcontentstore)
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repo.sharedhistorystores.append(packmetadatastore)
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shallowutil.reportpackmetrics(
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repo.ui, b'filestore', packcontentstore, packmetadatastore
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)
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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(
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repo, cachecontent, cachemetadata
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)
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# Instantiate union stores
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repo.contentstore = contentstore.unioncontentstore(
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packcontentstore,
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cachecontent,
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localcontent,
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remotecontent,
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writestore=localcontent,
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)
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repo.metadatastore = metadatastore.unionmetadatastore(
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packmetadatastore,
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cachemetadata,
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localmetadata,
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remotemetadata,
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writestore=localmetadata,
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)
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fileservicedatawrite = cachecontent
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fileservicehistorywrite = cachemetadata
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repo.fileservice.setstore(
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repo.contentstore,
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repo.metadatastore,
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fileservicedatawrite,
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fileservicehistorywrite,
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)
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shallowutil.reportpackmetrics(
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repo.ui, b'filestore', packcontentstore, packmetadatastore
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)
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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(b'remotefilelog', b'reponame')
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@util.propertycache
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def fallbackpath(self):
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path = repo.ui.config(
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b"remotefilelog",
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b"fallbackpath",
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repo.ui.config(b'paths', b'default'),
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)
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if not path:
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raise error.Abort(
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b"no remotefilelog server "
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b"configured - is your .hg/hgrc trusted?"
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)
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return path
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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 revs:
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ret = sparse.matcher(repo, revs=revs)
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else:
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ret = sparse.matcher(repo)
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if ret.always():
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return None
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return ret
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def file(self, f):
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if f[0] == b'/':
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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, *args, **kwargs):
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if self.shallowmatch(path):
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return remotefilectx.remotefilectx(self, path, *args, **kwargs)
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else:
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return super(shallowrepository, self).filectx(
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path, *args, **kwargs
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)
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@localrepo.unfilteredmethod
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def commitctx(self, ctx, error=False, origctx=None):
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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, self.nullid)
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if fparent1 != self.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(
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ctx, error=error, origctx=origctx
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)
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def backgroundprefetch(
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self, revs, base=None, repack=False, pats=None, opts=None
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):
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"""Runs prefetch in background with optional repack"""
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cmd = [procutil.hgexecutable(), b'-R', repo.origroot, b'prefetch']
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if repack:
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cmd.append(b'--repack')
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if revs:
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cmd += [b'-r', revs]
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# We know this command will find a binary, so don't block
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# on it starting.
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kwargs = {}
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if repo.ui.configbool(b'devel', b'remotefilelog.bg-wait'):
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kwargs['record_wait'] = repo.ui.atexit
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procutil.runbgcommand(
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cmd, encoding.environ, ensurestart=False, **kwargs
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)
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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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Optionally runs repack in background
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"""
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with repo._lock(
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repo.svfs,
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b'prefetchlock',
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True,
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None,
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None,
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_(b'prefetching in %s') % repo.origroot,
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):
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self._prefetch(revs, base, pats, opts)
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def _prefetch(self, revs, base=None, pats=None, opts=None):
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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(b'outgoing(%s)', fallbackpath)
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if base is not None and base != nullrev:
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serverbase = list(
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repo.revs(
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b'first(reverse(::%s) - %ld)', base, localrevs
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)
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)
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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.getstorage(b'')
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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.items())
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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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revcount = len(revs)
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progress = self.ui.makeprogress(_(b'prefetching'), total=revcount)
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progress.update(0)
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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.items()
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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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progress.increment()
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files.difference_update(skip)
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serverfiles.difference_update(skip)
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progress.complete()
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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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def close(self):
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super(shallowrepository, self).close()
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self.connectionpool.close()
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repo.__class__ = shallowrepository
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repo.shallowmatch = match.always()
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makeunionstores(repo)
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repo.includepattern = repo.ui.configlist(
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b"remotefilelog", b"includepattern", None
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)
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repo.excludepattern = repo.ui.configlist(
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b"remotefilelog", b"excludepattern", None
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)
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if not util.safehasattr(repo, 'connectionpool'):
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repo.connectionpool = connectionpool.connectionpool(repo)
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if repo.includepattern or repo.excludepattern:
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repo.shallowmatch = match.match(
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repo.root, b'', None, repo.includepattern, repo.excludepattern
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)
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