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# wrapper.py - methods wrapping core mercurial logic
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#
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# Copyright 2017 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 __future__ import absolute_import
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import hashlib
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from mercurial.i18n import _
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from mercurial.node import bin, nullid, short
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from mercurial import (
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error,
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filelog,
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revlog,
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util,
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)
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from ..largefiles import lfutil
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from . import (
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blobstore,
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pointer,
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)
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def supportedoutgoingversions(orig, repo):
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versions = orig(repo)
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if 'lfs' in repo.requirements:
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versions.discard('01')
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versions.discard('02')
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versions.add('03')
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return versions
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def allsupportedversions(orig, ui):
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versions = orig(ui)
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versions.add('03')
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return versions
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def _capabilities(orig, repo, proto):
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'''Wrap server command to announce lfs server capability'''
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caps = orig(repo, proto)
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# XXX: change to 'lfs=serve' when separate git server isn't required?
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caps.append('lfs')
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return caps
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def bypasscheckhash(self, text):
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return False
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def readfromstore(self, text):
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"""Read filelog content from local blobstore transform for flagprocessor.
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Default tranform for flagprocessor, returning contents from blobstore.
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Returns a 2-typle (text, validatehash) where validatehash is True as the
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contents of the blobstore should be checked using checkhash.
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"""
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p = pointer.deserialize(text)
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oid = p.oid()
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store = self.opener.lfslocalblobstore
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if not store.has(oid):
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p.filename = self.filename
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self.opener.lfsremoteblobstore.readbatch([p], store)
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# The caller will validate the content
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text = store.read(oid, verify=False)
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# pack hg filelog metadata
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hgmeta = {}
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for k in p.keys():
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if k.startswith('x-hg-'):
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name = k[len('x-hg-'):]
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hgmeta[name] = p[k]
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if hgmeta or text.startswith('\1\n'):
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text = filelog.packmeta(hgmeta, text)
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return (text, True)
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def writetostore(self, text):
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# hg filelog metadata (includes rename, etc)
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hgmeta, offset = filelog.parsemeta(text)
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if offset and offset > 0:
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# lfs blob does not contain hg filelog metadata
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text = text[offset:]
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# git-lfs only supports sha256
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oid = hashlib.sha256(text).hexdigest()
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self.opener.lfslocalblobstore.write(oid, text)
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# replace contents with metadata
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longoid = 'sha256:%s' % oid
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metadata = pointer.gitlfspointer(oid=longoid, size=str(len(text)))
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# by default, we expect the content to be binary. however, LFS could also
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# be used for non-binary content. add a special entry for non-binary data.
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# this will be used by filectx.isbinary().
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if not util.binary(text):
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# not hg filelog metadata (affecting commit hash), no "x-hg-" prefix
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metadata['x-is-binary'] = '0'
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# translate hg filelog metadata to lfs metadata with "x-hg-" prefix
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if hgmeta is not None:
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for k, v in hgmeta.iteritems():
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metadata['x-hg-%s' % k] = v
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rawtext = metadata.serialize()
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return (rawtext, False)
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def _islfs(rlog, node=None, rev=None):
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if rev is None:
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if node is None:
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# both None - likely working copy content where node is not ready
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return False
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rev = rlog.rev(node)
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else:
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node = rlog.node(rev)
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if node == nullid:
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return False
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flags = rlog.flags(rev)
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return bool(flags & revlog.REVIDX_EXTSTORED)
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def filelogaddrevision(orig, self, text, transaction, link, p1, p2,
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cachedelta=None, node=None,
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flags=revlog.REVIDX_DEFAULT_FLAGS, **kwds):
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textlen = len(text)
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# exclude hg rename meta from file size
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meta, offset = filelog.parsemeta(text)
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if offset:
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textlen -= offset
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lfstrack = self.opener.options['lfstrack']
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if lfstrack(self.filename, textlen):
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flags |= revlog.REVIDX_EXTSTORED
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return orig(self, text, transaction, link, p1, p2, cachedelta=cachedelta,
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node=node, flags=flags, **kwds)
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def filelogrenamed(orig, self, node):
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if _islfs(self, node):
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rawtext = self.revision(node, raw=True)
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if not rawtext:
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return False
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metadata = pointer.deserialize(rawtext)
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if 'x-hg-copy' in metadata and 'x-hg-copyrev' in metadata:
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return metadata['x-hg-copy'], bin(metadata['x-hg-copyrev'])
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else:
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return False
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return orig(self, node)
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def filelogsize(orig, self, rev):
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if _islfs(self, rev=rev):
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# fast path: use lfs metadata to answer size
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rawtext = self.revision(rev, raw=True)
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metadata = pointer.deserialize(rawtext)
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return int(metadata['size'])
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return orig(self, rev)
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def filectxcmp(orig, self, fctx):
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"""returns True if text is different than fctx"""
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# some fctx (ex. hg-git) is not based on basefilectx and do not have islfs
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if self.islfs() and getattr(fctx, 'islfs', lambda: False)():
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# fast path: check LFS oid
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p1 = pointer.deserialize(self.rawdata())
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p2 = pointer.deserialize(fctx.rawdata())
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return p1.oid() != p2.oid()
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return orig(self, fctx)
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def filectxisbinary(orig, self):
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if self.islfs():
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# fast path: use lfs metadata to answer isbinary
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metadata = pointer.deserialize(self.rawdata())
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# if lfs metadata says nothing, assume it's binary by default
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return bool(int(metadata.get('x-is-binary', 1)))
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return orig(self)
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def filectxislfs(self):
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return _islfs(self.filelog(), self.filenode())
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def _updatecatformatter(orig, fm, ctx, matcher, path, decode):
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orig(fm, ctx, matcher, path, decode)
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fm.data(rawdata=ctx[path].rawdata())
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def convertsink(orig, sink):
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sink = orig(sink)
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if sink.repotype == 'hg':
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class lfssink(sink.__class__):
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def putcommit(self, files, copies, parents, commit, source, revmap,
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full, cleanp2):
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pc = super(lfssink, self).putcommit
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node = pc(files, copies, parents, commit, source, revmap, full,
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cleanp2)
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if 'lfs' not in self.repo.requirements:
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ctx = self.repo[node]
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# The file list may contain removed files, so check for
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# membership before assuming it is in the context.
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if any(f in ctx and ctx[f].islfs() for f, n in files):
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self.repo.requirements.add('lfs')
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self.repo._writerequirements()
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# Permanently enable lfs locally
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self.repo.vfs.append(
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'hgrc', util.tonativeeol('\n[extensions]\nlfs=\n'))
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return node
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sink.__class__ = lfssink
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return sink
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def vfsinit(orig, self, othervfs):
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orig(self, othervfs)
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# copy lfs related options
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for k, v in othervfs.options.items():
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if k.startswith('lfs'):
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self.options[k] = v
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# also copy lfs blobstores. note: this can run before reposetup, so lfs
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# blobstore attributes are not always ready at this time.
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for name in ['lfslocalblobstore', 'lfsremoteblobstore']:
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if util.safehasattr(othervfs, name):
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setattr(self, name, getattr(othervfs, name))
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def hgclone(orig, ui, opts, *args, **kwargs):
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result = orig(ui, opts, *args, **kwargs)
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if result is not None:
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sourcerepo, destrepo = result
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repo = destrepo.local()
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# When cloning to a remote repo (like through SSH), no repo is available
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# from the peer. Therefore the hgrc can't be updated.
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if not repo:
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return result
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# If lfs is required for this repo, permanently enable it locally
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if 'lfs' in repo.requirements:
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repo.vfs.append('hgrc',
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util.tonativeeol('\n[extensions]\nlfs=\n'))
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return result
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def hgpostshare(orig, sourcerepo, destrepo, bookmarks=True, defaultpath=None):
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orig(sourcerepo, destrepo, bookmarks, defaultpath)
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# If lfs is required for this repo, permanently enable it locally
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if 'lfs' in destrepo.requirements:
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destrepo.vfs.append('hgrc', util.tonativeeol('\n[extensions]\nlfs=\n'))
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def _prefetchfiles(repo, ctx, files):
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"""Ensure that required LFS blobs are present, fetching them as a group if
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needed."""
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pointers = []
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localstore = repo.svfs.lfslocalblobstore
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for f in files:
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p = pointerfromctx(ctx, f)
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if p and not localstore.has(p.oid()):
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p.filename = f
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pointers.append(p)
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if pointers:
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repo.svfs.lfsremoteblobstore.readbatch(pointers, localstore)
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def _canskipupload(repo):
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# if remotestore is a null store, upload is a no-op and can be skipped
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return isinstance(repo.svfs.lfsremoteblobstore, blobstore._nullremote)
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def candownload(repo):
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# if remotestore is a null store, downloads will lead to nothing
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return not isinstance(repo.svfs.lfsremoteblobstore, blobstore._nullremote)
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def uploadblobsfromrevs(repo, revs):
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'''upload lfs blobs introduced by revs
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Note: also used by other extensions e. g. infinitepush. avoid renaming.
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'''
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if _canskipupload(repo):
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return
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pointers = extractpointers(repo, revs)
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uploadblobs(repo, pointers)
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def prepush(pushop):
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"""Prepush hook.
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Read through the revisions to push, looking for filelog entries that can be
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deserialized into metadata so that we can block the push on their upload to
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the remote blobstore.
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"""
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return uploadblobsfromrevs(pushop.repo, pushop.outgoing.missing)
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def push(orig, repo, remote, *args, **kwargs):
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"""bail on push if the extension isn't enabled on remote when needed"""
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if 'lfs' in repo.requirements:
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# If the remote peer is for a local repo, the requirement tests in the
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# base class method enforce lfs support. Otherwise, some revisions in
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# this repo use lfs, and the remote repo needs the extension loaded.
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if not remote.local() and not remote.capable('lfs'):
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# This is a copy of the message in exchange.push() when requirements
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# are missing between local repos.
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m = _("required features are not supported in the destination: %s")
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raise error.Abort(m % 'lfs',
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hint=_('enable the lfs extension on the server'))
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return orig(repo, remote, *args, **kwargs)
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def writenewbundle(orig, ui, repo, source, filename, bundletype, outgoing,
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*args, **kwargs):
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"""upload LFS blobs added by outgoing revisions on 'hg bundle'"""
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uploadblobsfromrevs(repo, outgoing.missing)
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return orig(ui, repo, source, filename, bundletype, outgoing, *args,
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**kwargs)
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def extractpointers(repo, revs):
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"""return a list of lfs pointers added by given revs"""
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repo.ui.debug('lfs: computing set of blobs to upload\n')
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pointers = {}
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for r in revs:
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ctx = repo[r]
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for p in pointersfromctx(ctx).values():
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pointers[p.oid()] = p
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return sorted(pointers.values())
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def pointerfromctx(ctx, f, removed=False):
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"""return a pointer for the named file from the given changectx, or None if
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the file isn't LFS.
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Optionally, the pointer for a file deleted from the context can be returned.
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Since no such pointer is actually stored, and to distinguish from a non LFS
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file, this pointer is represented by an empty dict.
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"""
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_ctx = ctx
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if f not in ctx:
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if not removed:
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return None
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if f in ctx.p1():
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_ctx = ctx.p1()
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elif f in ctx.p2():
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_ctx = ctx.p2()
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else:
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return None
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fctx = _ctx[f]
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if not _islfs(fctx.filelog(), fctx.filenode()):
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return None
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try:
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p = pointer.deserialize(fctx.rawdata())
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if ctx == _ctx:
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return p
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return {}
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except pointer.InvalidPointer as ex:
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raise error.Abort(_('lfs: corrupted pointer (%s@%s): %s\n')
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% (f, short(_ctx.node()), ex))
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def pointersfromctx(ctx, removed=False):
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"""return a dict {path: pointer} for given single changectx.
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If ``removed`` == True and the LFS file was removed from ``ctx``, the value
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stored for the path is an empty dict.
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"""
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result = {}
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for f in ctx.files():
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p = pointerfromctx(ctx, f, removed=removed)
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if p is not None:
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result[f] = p
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return result
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def uploadblobs(repo, pointers):
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"""upload given pointers from local blobstore"""
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if not pointers:
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return
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remoteblob = repo.svfs.lfsremoteblobstore
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remoteblob.writebatch(pointers, repo.svfs.lfslocalblobstore)
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def upgradefinishdatamigration(orig, ui, srcrepo, dstrepo, requirements):
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orig(ui, srcrepo, dstrepo, requirements)
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srclfsvfs = srcrepo.svfs.lfslocalblobstore.vfs
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dstlfsvfs = dstrepo.svfs.lfslocalblobstore.vfs
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for dirpath, dirs, files in srclfsvfs.walk():
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for oid in files:
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ui.write(_('copying lfs blob %s\n') % oid)
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lfutil.link(srclfsvfs.join(oid), dstlfsvfs.join(oid))
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def upgraderequirements(orig, repo):
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reqs = orig(repo)
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if 'lfs' in repo.requirements:
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reqs.add('lfs')
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return reqs
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