Mercurial > hg
view mercurial/upgrade_utils/engine.py @ 46194:4d1cec4e5e1f
engine: unwrap a hard to understand for loop
The loop was iterating over all the datafiles and maintaining a set to check
whether filelogs have been processed, manifests have been processed or not.
The code was hard to understand and it assumed that `alldatafiles` are ordered
in a certain way.
This refactors the for loop in separate parts for each manifests, changelog and
filelogs. This will also help in future work where we will like more better
handling on whether we want to upgrade filelogs or not.
Differential Revision: https://phab.mercurial-scm.org/D9580
author | Pulkit Goyal <7895pulkit@gmail.com> |
---|---|
date | Mon, 14 Dec 2020 14:38:01 +0530 |
parents | 85f7cf314b39 |
children | 6b40aac4da8e |
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# upgrade.py - functions for in place upgrade of Mercurial repository # # Copyright (c) 2016-present, Gregory Szorc # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import stat from ..i18n import _ from ..pycompat import getattr from .. import ( changelog, error, filelog, manifest, metadata, pycompat, requirements, revlog, scmutil, util, vfs as vfsmod, ) def _revlogfrompath(repo, path): """Obtain a revlog from a repo path. An instance of the appropriate class is returned. """ if path == b'00changelog.i': return changelog.changelog(repo.svfs) elif path.endswith(b'00manifest.i'): mandir = path[: -len(b'00manifest.i')] return manifest.manifestrevlog(repo.svfs, tree=mandir) else: # reverse of "/".join(("data", path + ".i")) return filelog.filelog(repo.svfs, path[5:-2]) def _copyrevlog(tr, destrepo, oldrl, unencodedname): """copy all relevant files for `oldrl` into `destrepo` store Files are copied "as is" without any transformation. The copy is performed without extra checks. Callers are responsible for making sure the copied content is compatible with format of the destination repository. """ oldrl = getattr(oldrl, '_revlog', oldrl) newrl = _revlogfrompath(destrepo, unencodedname) newrl = getattr(newrl, '_revlog', newrl) oldvfs = oldrl.opener newvfs = newrl.opener oldindex = oldvfs.join(oldrl.indexfile) newindex = newvfs.join(newrl.indexfile) olddata = oldvfs.join(oldrl.datafile) newdata = newvfs.join(newrl.datafile) with newvfs(newrl.indexfile, b'w'): pass # create all the directories util.copyfile(oldindex, newindex) copydata = oldrl.opener.exists(oldrl.datafile) if copydata: util.copyfile(olddata, newdata) if not ( unencodedname.endswith(b'00changelog.i') or unencodedname.endswith(b'00manifest.i') ): destrepo.svfs.fncache.add(unencodedname) if copydata: destrepo.svfs.fncache.add(unencodedname[:-2] + b'.d') UPGRADE_CHANGELOG = b"changelog" UPGRADE_MANIFEST = b"manifest" UPGRADE_FILELOGS = b"all-filelogs" UPGRADE_ALL_REVLOGS = frozenset( [UPGRADE_CHANGELOG, UPGRADE_MANIFEST, UPGRADE_FILELOGS] ) def getsidedatacompanion(srcrepo, dstrepo): sidedatacompanion = None removedreqs = srcrepo.requirements - dstrepo.requirements addedreqs = dstrepo.requirements - srcrepo.requirements if requirements.SIDEDATA_REQUIREMENT in removedreqs: def sidedatacompanion(rl, rev): rl = getattr(rl, '_revlog', rl) if rl.flags(rev) & revlog.REVIDX_SIDEDATA: return True, (), {}, 0, 0 return False, (), {}, 0, 0 elif requirements.COPIESSDC_REQUIREMENT in addedreqs: sidedatacompanion = metadata.getsidedataadder(srcrepo, dstrepo) elif requirements.COPIESSDC_REQUIREMENT in removedreqs: sidedatacompanion = metadata.getsidedataremover(srcrepo, dstrepo) return sidedatacompanion def matchrevlog(revlogfilter, entry): """check if a revlog is selected for cloning. In other words, are there any updates which need to be done on revlog or it can be blindly copied. The store entry is checked against the passed filter""" if entry.endswith(b'00changelog.i'): return UPGRADE_CHANGELOG in revlogfilter elif entry.endswith(b'00manifest.i'): return UPGRADE_MANIFEST in revlogfilter return UPGRADE_FILELOGS in revlogfilter def _perform_clone( ui, dstrepo, tr, old_revlog, unencoded, deltareuse, forcedeltabothparents, revlogs, sidedatacompanion, oncopiedrevision, ): """ returns the new revlog object created""" newrl = None if matchrevlog(revlogs, unencoded): ui.note( _(b'cloning %d revisions from %s\n') % (len(old_revlog), unencoded) ) newrl = _revlogfrompath(dstrepo, unencoded) old_revlog.clone( tr, newrl, addrevisioncb=oncopiedrevision, deltareuse=deltareuse, forcedeltabothparents=forcedeltabothparents, sidedatacompanion=sidedatacompanion, ) else: msg = _(b'blindly copying %s containing %i revisions\n') ui.note(msg % (unencoded, len(old_revlog))) _copyrevlog(tr, dstrepo, old_revlog, unencoded) newrl = _revlogfrompath(dstrepo, unencoded) return newrl def _clonerevlogs( ui, srcrepo, dstrepo, tr, deltareuse, forcedeltabothparents, revlogs=UPGRADE_ALL_REVLOGS, ): """Copy revlogs between 2 repos.""" revcount = 0 srcsize = 0 srcrawsize = 0 dstsize = 0 fcount = 0 frevcount = 0 fsrcsize = 0 frawsize = 0 fdstsize = 0 mcount = 0 mrevcount = 0 msrcsize = 0 mrawsize = 0 mdstsize = 0 crevcount = 0 csrcsize = 0 crawsize = 0 cdstsize = 0 alldatafiles = list(srcrepo.store.walk()) # mapping of data files which needs to be cloned # key is unencoded filename # value is revlog_object_from_srcrepo manifests = {} changelogs = {} filelogs = {} # Perform a pass to collect metadata. This validates we can open all # source files and allows a unified progress bar to be displayed. for unencoded, encoded, size in alldatafiles: if unencoded.endswith(b'.d'): continue rl = _revlogfrompath(srcrepo, unencoded) info = rl.storageinfo( exclusivefiles=True, revisionscount=True, trackedsize=True, storedsize=True, ) revcount += info[b'revisionscount'] or 0 datasize = info[b'storedsize'] or 0 rawsize = info[b'trackedsize'] or 0 srcsize += datasize srcrawsize += rawsize # This is for the separate progress bars. if isinstance(rl, changelog.changelog): changelogs[unencoded] = rl crevcount += len(rl) csrcsize += datasize crawsize += rawsize elif isinstance(rl, manifest.manifestrevlog): manifests[unencoded] = rl mcount += 1 mrevcount += len(rl) msrcsize += datasize mrawsize += rawsize elif isinstance(rl, filelog.filelog): filelogs[unencoded] = rl fcount += 1 frevcount += len(rl) fsrcsize += datasize frawsize += rawsize else: error.ProgrammingError(b'unknown revlog type') if not revcount: return ui.status( _( b'migrating %d total revisions (%d in filelogs, %d in manifests, ' b'%d in changelog)\n' ) % (revcount, frevcount, mrevcount, crevcount) ) ui.status( _(b'migrating %s in store; %s tracked data\n') % ((util.bytecount(srcsize), util.bytecount(srcrawsize))) ) # Used to keep track of progress. progress = None def oncopiedrevision(rl, rev, node): progress.increment() sidedatacompanion = getsidedatacompanion(srcrepo, dstrepo) # Migrating filelogs ui.status( _( b'migrating %d filelogs containing %d revisions ' b'(%s in store; %s tracked data)\n' ) % ( fcount, frevcount, util.bytecount(fsrcsize), util.bytecount(frawsize), ) ) progress = srcrepo.ui.makeprogress(_(b'file revisions'), total=frevcount) for unencoded, oldrl in sorted(filelogs.items()): newrl = _perform_clone( ui, dstrepo, tr, oldrl, unencoded, deltareuse, forcedeltabothparents, revlogs, sidedatacompanion, oncopiedrevision, ) info = newrl.storageinfo(storedsize=True) datasize = info[b'storedsize'] or 0 dstsize += datasize fdstsize += datasize ui.status( _( b'finished migrating %d filelog revisions across %d ' b'filelogs; change in size: %s\n' ) % (frevcount, fcount, util.bytecount(fdstsize - fsrcsize)) ) # Migrating manifests ui.status( _( b'migrating %d manifests containing %d revisions ' b'(%s in store; %s tracked data)\n' ) % ( mcount, mrevcount, util.bytecount(msrcsize), util.bytecount(mrawsize), ) ) if progress: progress.complete() progress = srcrepo.ui.makeprogress( _(b'manifest revisions'), total=mrevcount ) for unencoded, oldrl in sorted(manifests.items()): newrl = _perform_clone( ui, dstrepo, tr, oldrl, unencoded, deltareuse, forcedeltabothparents, revlogs, sidedatacompanion, oncopiedrevision, ) info = newrl.storageinfo(storedsize=True) datasize = info[b'storedsize'] or 0 dstsize += datasize mdstsize += datasize ui.status( _( b'finished migrating %d manifest revisions across %d ' b'manifests; change in size: %s\n' ) % (mrevcount, mcount, util.bytecount(mdstsize - msrcsize)) ) # Migrating changelog ui.status( _( b'migrating changelog containing %d revisions ' b'(%s in store; %s tracked data)\n' ) % ( crevcount, util.bytecount(csrcsize), util.bytecount(crawsize), ) ) if progress: progress.complete() progress = srcrepo.ui.makeprogress( _(b'changelog revisions'), total=crevcount ) for unencoded, oldrl in sorted(changelogs.items()): newrl = _perform_clone( ui, dstrepo, tr, oldrl, unencoded, deltareuse, forcedeltabothparents, revlogs, sidedatacompanion, oncopiedrevision, ) info = newrl.storageinfo(storedsize=True) datasize = info[b'storedsize'] or 0 dstsize += datasize cdstsize += datasize progress.complete() ui.status( _( b'finished migrating %d changelog revisions; change in size: ' b'%s\n' ) % (crevcount, util.bytecount(cdstsize - csrcsize)) ) ui.status( _( b'finished migrating %d total revisions; total change in store ' b'size: %s\n' ) % (revcount, util.bytecount(dstsize - srcsize)) ) def _filterstorefile(srcrepo, dstrepo, requirements, path, mode, st): """Determine whether to copy a store file during upgrade. This function is called when migrating store files from ``srcrepo`` to ``dstrepo`` as part of upgrading a repository. Args: srcrepo: repo we are copying from dstrepo: repo we are copying to requirements: set of requirements for ``dstrepo`` path: store file being examined mode: the ``ST_MODE`` file type of ``path`` st: ``stat`` data structure for ``path`` Function should return ``True`` if the file is to be copied. """ # Skip revlogs. if path.endswith((b'.i', b'.d', b'.n', b'.nd')): return False # Skip transaction related files. if path.startswith(b'undo'): return False # Only copy regular files. if mode != stat.S_IFREG: return False # Skip other skipped files. if path in (b'lock', b'fncache'): return False return True def _finishdatamigration(ui, srcrepo, dstrepo, requirements): """Hook point for extensions to perform additional actions during upgrade. This function is called after revlogs and store files have been copied but before the new store is swapped into the original location. """ def upgrade(ui, srcrepo, dstrepo, upgrade_op): """Do the low-level work of upgrading a repository. The upgrade is effectively performed as a copy between a source repository and a temporary destination repository. The source repository is unmodified for as long as possible so the upgrade can abort at any time without causing loss of service for readers and without corrupting the source repository. """ assert srcrepo.currentwlock() assert dstrepo.currentwlock() ui.status( _( b'(it is safe to interrupt this process any time before ' b'data migration completes)\n' ) ) if upgrade_op.has_action(b're-delta-all'): deltareuse = revlog.revlog.DELTAREUSENEVER elif upgrade_op.has_action(b're-delta-parent'): deltareuse = revlog.revlog.DELTAREUSESAMEREVS elif upgrade_op.has_action(b're-delta-multibase'): deltareuse = revlog.revlog.DELTAREUSESAMEREVS elif upgrade_op.has_action(b're-delta-fulladd'): deltareuse = revlog.revlog.DELTAREUSEFULLADD else: deltareuse = revlog.revlog.DELTAREUSEALWAYS with dstrepo.transaction(b'upgrade') as tr: _clonerevlogs( ui, srcrepo, dstrepo, tr, deltareuse, upgrade_op.has_action(b're-delta-multibase'), revlogs=upgrade_op.revlogs_to_process, ) # Now copy other files in the store directory. # The sorted() makes execution deterministic. for p, kind, st in sorted(srcrepo.store.vfs.readdir(b'', stat=True)): if not _filterstorefile( srcrepo, dstrepo, upgrade_op.new_requirements, p, kind, st ): continue srcrepo.ui.status(_(b'copying %s\n') % p) src = srcrepo.store.rawvfs.join(p) dst = dstrepo.store.rawvfs.join(p) util.copyfile(src, dst, copystat=True) _finishdatamigration(ui, srcrepo, dstrepo, requirements) ui.status(_(b'data fully migrated to temporary repository\n')) backuppath = pycompat.mkdtemp(prefix=b'upgradebackup.', dir=srcrepo.path) backupvfs = vfsmod.vfs(backuppath) # Make a backup of requires file first, as it is the first to be modified. util.copyfile(srcrepo.vfs.join(b'requires'), backupvfs.join(b'requires')) # We install an arbitrary requirement that clients must not support # as a mechanism to lock out new clients during the data swap. This is # better than allowing a client to continue while the repository is in # an inconsistent state. ui.status( _( b'marking source repository as being upgraded; clients will be ' b'unable to read from repository\n' ) ) scmutil.writereporequirements( srcrepo, srcrepo.requirements | {b'upgradeinprogress'} ) ui.status(_(b'starting in-place swap of repository data\n')) ui.status(_(b'replaced files will be backed up at %s\n') % backuppath) # Now swap in the new store directory. Doing it as a rename should make # the operation nearly instantaneous and atomic (at least in well-behaved # environments). ui.status(_(b'replacing store...\n')) tstart = util.timer() util.rename(srcrepo.spath, backupvfs.join(b'store')) util.rename(dstrepo.spath, srcrepo.spath) elapsed = util.timer() - tstart ui.status( _( b'store replacement complete; repository was inconsistent for ' b'%0.1fs\n' ) % elapsed ) # We first write the requirements file. Any new requirements will lock # out legacy clients. ui.status( _( b'finalizing requirements file and making repository readable ' b'again\n' ) ) scmutil.writereporequirements(srcrepo, upgrade_op.new_requirements) # The lock file from the old store won't be removed because nothing has a # reference to its new location. So clean it up manually. Alternatively, we # could update srcrepo.svfs and other variables to point to the new # location. This is simpler. backupvfs.unlink(b'store/lock') return backuppath