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# upgrade.py - functions for in place upgrade of Mercurial repository
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#
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# Copyright (c) 2016-present, Gregory Szorc
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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 stat
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from ..i18n import _
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from ..pycompat import getattr
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from .. import (
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changelog,
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error,
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filelog,
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manifest,
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metadata,
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pycompat,
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requirements,
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revlog,
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scmutil,
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util,
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vfs as vfsmod,
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)
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def _revlogfrompath(repo, path):
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"""Obtain a revlog from a repo path.
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An instance of the appropriate class is returned.
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"""
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if path == b'00changelog.i':
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return changelog.changelog(repo.svfs)
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elif path.endswith(b'00manifest.i'):
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mandir = path[: -len(b'00manifest.i')]
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return manifest.manifestrevlog(repo.svfs, tree=mandir)
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else:
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# reverse of "/".join(("data", path + ".i"))
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return filelog.filelog(repo.svfs, path[5:-2])
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def _copyrevlog(tr, destrepo, oldrl, unencodedname):
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"""copy all relevant files for `oldrl` into `destrepo` store
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Files are copied "as is" without any transformation. The copy is performed
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without extra checks. Callers are responsible for making sure the copied
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content is compatible with format of the destination repository.
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"""
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oldrl = getattr(oldrl, '_revlog', oldrl)
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newrl = _revlogfrompath(destrepo, unencodedname)
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newrl = getattr(newrl, '_revlog', newrl)
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oldvfs = oldrl.opener
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newvfs = newrl.opener
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oldindex = oldvfs.join(oldrl.indexfile)
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newindex = newvfs.join(newrl.indexfile)
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olddata = oldvfs.join(oldrl.datafile)
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newdata = newvfs.join(newrl.datafile)
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with newvfs(newrl.indexfile, b'w'):
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pass # create all the directories
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util.copyfile(oldindex, newindex)
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copydata = oldrl.opener.exists(oldrl.datafile)
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if copydata:
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util.copyfile(olddata, newdata)
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if not (
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unencodedname.endswith(b'00changelog.i')
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or unencodedname.endswith(b'00manifest.i')
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):
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destrepo.svfs.fncache.add(unencodedname)
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if copydata:
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destrepo.svfs.fncache.add(unencodedname[:-2] + b'.d')
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UPGRADE_CHANGELOG = b"changelog"
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UPGRADE_MANIFEST = b"manifest"
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UPGRADE_FILELOGS = b"all-filelogs"
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UPGRADE_ALL_REVLOGS = frozenset(
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[UPGRADE_CHANGELOG, UPGRADE_MANIFEST, UPGRADE_FILELOGS]
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)
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def getsidedatacompanion(srcrepo, dstrepo):
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sidedatacompanion = None
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removedreqs = srcrepo.requirements - dstrepo.requirements
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addedreqs = dstrepo.requirements - srcrepo.requirements
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if requirements.SIDEDATA_REQUIREMENT in removedreqs:
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def sidedatacompanion(rl, rev):
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rl = getattr(rl, '_revlog', rl)
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if rl.flags(rev) & revlog.REVIDX_SIDEDATA:
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return True, (), {}, 0, 0
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return False, (), {}, 0, 0
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elif requirements.COPIESSDC_REQUIREMENT in addedreqs:
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sidedatacompanion = metadata.getsidedataadder(srcrepo, dstrepo)
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elif requirements.COPIESSDC_REQUIREMENT in removedreqs:
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sidedatacompanion = metadata.getsidedataremover(srcrepo, dstrepo)
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return sidedatacompanion
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def matchrevlog(revlogfilter, entry):
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"""check if a revlog is selected for cloning.
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In other words, are there any updates which need to be done on revlog
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or it can be blindly copied.
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The store entry is checked against the passed filter"""
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if entry.endswith(b'00changelog.i'):
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return UPGRADE_CHANGELOG in revlogfilter
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elif entry.endswith(b'00manifest.i'):
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return UPGRADE_MANIFEST in revlogfilter
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return UPGRADE_FILELOGS in revlogfilter
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def _perform_clone(
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ui,
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dstrepo,
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tr,
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old_revlog,
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unencoded,
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upgrade_op,
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sidedatacompanion,
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oncopiedrevision,
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):
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""" returns the new revlog object created"""
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newrl = None
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if matchrevlog(upgrade_op.revlogs_to_process, unencoded):
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ui.note(
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_(b'cloning %d revisions from %s\n') % (len(old_revlog), unencoded)
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)
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newrl = _revlogfrompath(dstrepo, unencoded)
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old_revlog.clone(
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tr,
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newrl,
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addrevisioncb=oncopiedrevision,
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deltareuse=upgrade_op.delta_reuse_mode,
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forcedeltabothparents=upgrade_op.force_re_delta_both_parents,
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sidedatacompanion=sidedatacompanion,
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)
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else:
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msg = _(b'blindly copying %s containing %i revisions\n')
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ui.note(msg % (unencoded, len(old_revlog)))
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_copyrevlog(tr, dstrepo, old_revlog, unencoded)
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newrl = _revlogfrompath(dstrepo, unencoded)
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return newrl
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def _clonerevlogs(
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ui,
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srcrepo,
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dstrepo,
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tr,
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upgrade_op,
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):
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"""Copy revlogs between 2 repos."""
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revcount = 0
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srcsize = 0
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srcrawsize = 0
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dstsize = 0
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fcount = 0
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frevcount = 0
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fsrcsize = 0
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frawsize = 0
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fdstsize = 0
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mcount = 0
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mrevcount = 0
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msrcsize = 0
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mrawsize = 0
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mdstsize = 0
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crevcount = 0
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csrcsize = 0
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crawsize = 0
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cdstsize = 0
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alldatafiles = list(srcrepo.store.walk())
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# mapping of data files which needs to be cloned
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# key is unencoded filename
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# value is revlog_object_from_srcrepo
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manifests = {}
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changelogs = {}
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filelogs = {}
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# Perform a pass to collect metadata. This validates we can open all
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# source files and allows a unified progress bar to be displayed.
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for unencoded, encoded, size in alldatafiles:
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if unencoded.endswith(b'.d'):
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continue
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rl = _revlogfrompath(srcrepo, unencoded)
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info = rl.storageinfo(
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exclusivefiles=True,
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revisionscount=True,
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trackedsize=True,
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storedsize=True,
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)
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revcount += info[b'revisionscount'] or 0
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datasize = info[b'storedsize'] or 0
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rawsize = info[b'trackedsize'] or 0
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srcsize += datasize
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srcrawsize += rawsize
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# This is for the separate progress bars.
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if isinstance(rl, changelog.changelog):
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changelogs[unencoded] = rl
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crevcount += len(rl)
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csrcsize += datasize
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crawsize += rawsize
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elif isinstance(rl, manifest.manifestrevlog):
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manifests[unencoded] = rl
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mcount += 1
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mrevcount += len(rl)
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msrcsize += datasize
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mrawsize += rawsize
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elif isinstance(rl, filelog.filelog):
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filelogs[unencoded] = rl
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fcount += 1
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frevcount += len(rl)
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fsrcsize += datasize
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frawsize += rawsize
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else:
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error.ProgrammingError(b'unknown revlog type')
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if not revcount:
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return
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ui.status(
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_(
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b'migrating %d total revisions (%d in filelogs, %d in manifests, '
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b'%d in changelog)\n'
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)
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% (revcount, frevcount, mrevcount, crevcount)
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)
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ui.status(
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_(b'migrating %s in store; %s tracked data\n')
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% ((util.bytecount(srcsize), util.bytecount(srcrawsize)))
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)
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# Used to keep track of progress.
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progress = None
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def oncopiedrevision(rl, rev, node):
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progress.increment()
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sidedatacompanion = getsidedatacompanion(srcrepo, dstrepo)
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# Migrating filelogs
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ui.status(
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_(
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b'migrating %d filelogs containing %d revisions '
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b'(%s in store; %s tracked data)\n'
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)
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% (
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fcount,
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frevcount,
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util.bytecount(fsrcsize),
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util.bytecount(frawsize),
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)
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)
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progress = srcrepo.ui.makeprogress(_(b'file revisions'), total=frevcount)
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for unencoded, oldrl in sorted(filelogs.items()):
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newrl = _perform_clone(
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ui,
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dstrepo,
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tr,
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oldrl,
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unencoded,
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upgrade_op,
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sidedatacompanion,
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oncopiedrevision,
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)
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info = newrl.storageinfo(storedsize=True)
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fdstsize += info[b'storedsize'] or 0
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ui.status(
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_(
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b'finished migrating %d filelog revisions across %d '
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b'filelogs; change in size: %s\n'
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)
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% (frevcount, fcount, util.bytecount(fdstsize - fsrcsize))
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)
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# Migrating manifests
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ui.status(
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_(
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b'migrating %d manifests containing %d revisions '
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b'(%s in store; %s tracked data)\n'
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)
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% (
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mcount,
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mrevcount,
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util.bytecount(msrcsize),
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util.bytecount(mrawsize),
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)
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)
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if progress:
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progress.complete()
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progress = srcrepo.ui.makeprogress(
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_(b'manifest revisions'), total=mrevcount
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)
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for unencoded, oldrl in sorted(manifests.items()):
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newrl = _perform_clone(
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ui,
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dstrepo,
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tr,
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oldrl,
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unencoded,
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upgrade_op,
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sidedatacompanion,
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oncopiedrevision,
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)
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info = newrl.storageinfo(storedsize=True)
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mdstsize += info[b'storedsize'] or 0
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ui.status(
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_(
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b'finished migrating %d manifest revisions across %d '
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b'manifests; change in size: %s\n'
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)
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% (mrevcount, mcount, util.bytecount(mdstsize - msrcsize))
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)
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# Migrating changelog
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ui.status(
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_(
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b'migrating changelog containing %d revisions '
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b'(%s in store; %s tracked data)\n'
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)
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% (
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crevcount,
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util.bytecount(csrcsize),
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util.bytecount(crawsize),
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)
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)
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if progress:
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progress.complete()
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progress = srcrepo.ui.makeprogress(
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_(b'changelog revisions'), total=crevcount
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)
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for unencoded, oldrl in sorted(changelogs.items()):
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newrl = _perform_clone(
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ui,
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dstrepo,
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tr,
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oldrl,
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unencoded,
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upgrade_op,
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sidedatacompanion,
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oncopiedrevision,
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)
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info = newrl.storageinfo(storedsize=True)
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cdstsize += info[b'storedsize'] or 0
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progress.complete()
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ui.status(
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_(
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b'finished migrating %d changelog revisions; change in size: '
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b'%s\n'
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)
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% (crevcount, util.bytecount(cdstsize - csrcsize))
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)
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dstsize = fdstsize + mdstsize + cdstsize
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ui.status(
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_(
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b'finished migrating %d total revisions; total change in store '
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b'size: %s\n'
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)
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% (revcount, util.bytecount(dstsize - srcsize))
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)
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def _filterstorefile(srcrepo, dstrepo, requirements, path, mode, st):
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"""Determine whether to copy a store file during upgrade.
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This function is called when migrating store files from ``srcrepo`` to
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``dstrepo`` as part of upgrading a repository.
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Args:
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srcrepo: repo we are copying from
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dstrepo: repo we are copying to
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requirements: set of requirements for ``dstrepo``
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path: store file being examined
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mode: the ``ST_MODE`` file type of ``path``
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st: ``stat`` data structure for ``path``
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Function should return ``True`` if the file is to be copied.
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"""
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# Skip revlogs.
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if path.endswith((b'.i', b'.d', b'.n', b'.nd')):
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return False
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# Skip transaction related files.
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if path.startswith(b'undo'):
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return False
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# Only copy regular files.
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if mode != stat.S_IFREG:
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return False
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# Skip other skipped files.
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if path in (b'lock', b'fncache'):
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return False
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return True
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def _replacestores(currentrepo, upgradedrepo, backupvfs, upgrade_op):
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"""Replace the stores after current repository is upgraded
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Creates a backup of current repository store at backup path
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Replaces upgraded store files in current repo from upgraded one
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Arguments:
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currentrepo: repo object of current repository
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upgradedrepo: repo object of the upgraded data
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backupvfs: vfs object for the backup path
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upgrade_op: upgrade operation object
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to be used to decide what all is upgraded
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"""
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# TODO: don't blindly rename everything in store
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# There can be upgrades where store is not touched at all
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util.rename(currentrepo.spath, backupvfs.join(b'store'))
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util.rename(upgradedrepo.spath, currentrepo.spath)
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def finishdatamigration(ui, srcrepo, dstrepo, requirements):
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"""Hook point for extensions to perform additional actions during upgrade.
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This function is called after revlogs and store files have been copied but
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before the new store is swapped into the original location.
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"""
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def upgrade(ui, srcrepo, dstrepo, upgrade_op):
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"""Do the low-level work of upgrading a repository.
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The upgrade is effectively performed as a copy between a source
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repository and a temporary destination repository.
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The source repository is unmodified for as long as possible so the
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upgrade can abort at any time without causing loss of service for
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readers and without corrupting the source repository.
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"""
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assert srcrepo.currentwlock()
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assert dstrepo.currentwlock()
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ui.status(
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_(
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b'(it is safe to interrupt this process any time before '
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b'data migration completes)\n'
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)
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)
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with dstrepo.transaction(b'upgrade') as tr:
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_clonerevlogs(
|
|
|
ui,
|
|
|
srcrepo,
|
|
|
dstrepo,
|
|
|
tr,
|
|
|
upgrade_op,
|
|
|
)
|
|
|
|
|
|
# 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()
|
|
|
_replacestores(srcrepo, dstrepo, backupvfs, upgrade_op)
|
|
|
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
|
|
|
|
