Mercurial > hg
view hgext/fetch.py @ 46843:728d89f6f9b1
refactor: prefer checks against nullrev over nullid
A common pattern is using a changeset context and obtaining the node to
compare against nullid. Change this to obtain the nullrev instead. In
the future, the nullid becomes a property of the repository and is no
longer a global constant, so using nullrev is much easier to reason
about. Python function call overhead makes the difference moot, but
future changes will result in more dictionary lookups otherwise, so
prefer the simpler pattern.
Differential Revision: https://phab.mercurial-scm.org/D10290
author | Joerg Sonnenberger <joerg@bec.de> |
---|---|
date | Tue, 30 Mar 2021 02:32:30 +0200 |
parents | 89a2afe31e82 |
children | ffd3e823a7e5 |
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# fetch.py - pull and merge remote changes # # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. '''pull, update and merge in one command (DEPRECATED)''' from __future__ import absolute_import from mercurial.i18n import _ from mercurial.node import short from mercurial import ( cmdutil, error, exchange, hg, lock, pycompat, registrar, util, ) from mercurial.utils import dateutil release = lock.release cmdtable = {} command = registrar.command(cmdtable) # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should # be specifying the version(s) of Mercurial they are tested with, or # leave the attribute unspecified. testedwith = b'ships-with-hg-core' @command( b'fetch', [ ( b'r', b'rev', [], _(b'a specific revision you would like to pull'), _(b'REV'), ), (b'', b'edit', None, _(b'invoke editor on commit messages')), (b'', b'force-editor', None, _(b'edit commit message (DEPRECATED)')), (b'', b'switch-parent', None, _(b'switch parents when merging')), ] + cmdutil.commitopts + cmdutil.commitopts2 + cmdutil.remoteopts, _(b'hg fetch [SOURCE]'), helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT, ) def fetch(ui, repo, source=b'default', **opts): """pull changes from a remote repository, merge new changes if needed. This finds all changes from the repository at the specified path or URL and adds them to the local repository. If the pulled changes add a new branch head, the head is automatically merged, and the result of the merge is committed. Otherwise, the working directory is updated to include the new changes. When a merge is needed, the working directory is first updated to the newly pulled changes. Local changes are then merged into the pulled changes. To switch the merge order, use --switch-parent. See :hg:`help dates` for a list of formats valid for -d/--date. Returns 0 on success. """ opts = pycompat.byteskwargs(opts) date = opts.get(b'date') if date: opts[b'date'] = dateutil.parsedate(date) parent = repo.dirstate.p1() branch = repo.dirstate.branch() try: branchnode = repo.branchtip(branch) except error.RepoLookupError: branchnode = None if parent != branchnode: raise error.Abort( _(b'working directory not at branch tip'), hint=_(b"use 'hg update' to check out branch tip"), ) wlock = lock = None try: wlock = repo.wlock() lock = repo.lock() cmdutil.bailifchanged(repo) bheads = repo.branchheads(branch) bheads = [head for head in bheads if len(repo[head].children()) == 0] if len(bheads) > 1: raise error.Abort( _( b'multiple heads in this branch ' b'(use "hg heads ." and "hg merge" to merge)' ) ) other = hg.peer(repo, opts, ui.expandpath(source)) ui.status( _(b'pulling from %s\n') % util.hidepassword(ui.expandpath(source)) ) revs = None if opts[b'rev']: try: revs = [other.lookup(rev) for rev in opts[b'rev']] except error.CapabilityError: err = _( b"other repository doesn't support revision lookup, " b"so a rev cannot be specified." ) raise error.Abort(err) # Are there any changes at all? modheads = exchange.pull(repo, other, heads=revs).cgresult if modheads == 0: return 0 # Is this a simple fast-forward along the current branch? newheads = repo.branchheads(branch) newchildren = repo.changelog.nodesbetween([parent], newheads)[2] if len(newheads) == 1 and len(newchildren): if newchildren[0] != parent: return hg.update(repo, newchildren[0]) else: return 0 # Are there more than one additional branch heads? newchildren = [n for n in newchildren if n != parent] newparent = parent if newchildren: newparent = newchildren[0] hg.clean(repo, newparent) newheads = [n for n in newheads if n != newparent] if len(newheads) > 1: ui.status( _( b'not merging with %d other new branch heads ' b'(use "hg heads ." and "hg merge" to merge them)\n' ) % (len(newheads) - 1) ) return 1 if not newheads: return 0 # Otherwise, let's merge. err = False if newheads: # By default, we consider the repository we're pulling # *from* as authoritative, so we merge our changes into # theirs. if opts[b'switch_parent']: firstparent, secondparent = newparent, newheads[0] else: firstparent, secondparent = newheads[0], newparent ui.status( _(b'updating to %d:%s\n') % (repo.changelog.rev(firstparent), short(firstparent)) ) hg.clean(repo, firstparent) p2ctx = repo[secondparent] ui.status( _(b'merging with %d:%s\n') % (p2ctx.rev(), short(secondparent)) ) err = hg.merge(p2ctx, remind=False) if not err: # we don't translate commit messages message = cmdutil.logmessage(ui, opts) or ( b'Automated merge with %s' % util.removeauth(other.url()) ) editopt = opts.get(b'edit') or opts.get(b'force_editor') editor = cmdutil.getcommiteditor(edit=editopt, editform=b'fetch') n = repo.commit( message, opts[b'user'], opts[b'date'], editor=editor ) ui.status( _(b'new changeset %d:%s merges remote changes with local\n') % (repo.changelog.rev(n), short(n)) ) return err finally: release(lock, wlock)