graphmod: add config cache
Before, we'd lookup the branch for every edge segment in the entire
graph: extremely expensive. This happened even when no per-branch
settings existed.
Now we define a revision -> config cache function that's LRU-cached
and is a no-op when no configuration exists. Still not terribly fast,
but hopefully only one real branch lookup per revision. This might
degenerate for wide graphs as the LRU is hard-coded to 20 elements.
# 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'''
from mercurial.i18n import _
from mercurial.node import nullid, short
from mercurial import commands, cmdutil, hg, util, error
from mercurial.lock import release
def fetch(ui, repo, source='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 occurs, the newly pulled changes are assumed to be
"authoritative". The head of the new changes is used as the first
parent, with local changes as the second. 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.
'''
date = opts.get('date')
if date:
opts['date'] = util.parsedate(date)
parent, p2 = repo.dirstate.parents()
branch = repo.dirstate.branch()
branchnode = repo.branchtags().get(branch)
if parent != branchnode:
raise util.Abort(_('working dir not at branch tip '
'(use "hg update" to check out branch tip)'))
if p2 != nullid:
raise util.Abort(_('outstanding uncommitted merge'))
wlock = lock = None
try:
wlock = repo.wlock()
lock = repo.lock()
mod, add, rem, del_ = repo.status()[:4]
if mod or add or rem:
raise util.Abort(_('outstanding uncommitted changes'))
if del_:
raise util.Abort(_('working directory is missing some files'))
bheads = repo.branchheads(branch)
bheads = [head for head in bheads if len(repo[head].children()) == 0]
if len(bheads) > 1:
raise util.Abort(_('multiple heads in this branch '
'(use "hg heads ." and "hg merge" to merge)'))
other = hg.peer(repo, opts, ui.expandpath(source))
ui.status(_('pulling from %s\n') %
util.hidepassword(ui.expandpath(source)))
revs = None
if opts['rev']:
try:
revs = [other.lookup(rev) for rev in opts['rev']]
except error.CapabilityError:
err = _("Other repository doesn't support revision lookup, "
"so a rev cannot be specified.")
raise util.Abort(err)
# Are there any changes at all?
modheads = repo.pull(other, heads=revs)
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(_('not merging with %d other new branch heads '
'(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['switch_parent']:
firstparent, secondparent = newparent, newheads[0]
else:
firstparent, secondparent = newheads[0], newparent
ui.status(_('updating to %d:%s\n') %
(repo.changelog.rev(firstparent),
short(firstparent)))
hg.clean(repo, firstparent)
ui.status(_('merging with %d:%s\n') %
(repo.changelog.rev(secondparent), short(secondparent)))
err = hg.merge(repo, secondparent, remind=False)
if not err:
# we don't translate commit messages
message = (cmdutil.logmessage(ui, opts) or
('Automated merge with %s' %
util.removeauth(other.url())))
editor = cmdutil.commiteditor
if opts.get('force_editor') or opts.get('edit'):
editor = cmdutil.commitforceeditor
n = repo.commit(message, opts['user'], opts['date'], editor=editor)
ui.status(_('new changeset %d:%s merges remote changes '
'with local\n') % (repo.changelog.rev(n),
short(n)))
return err
finally:
release(lock, wlock)
cmdtable = {
'fetch':
(fetch,
[('r', 'rev', [],
_('a specific revision you would like to pull'), _('REV')),
('e', 'edit', None, _('edit commit message')),
('', 'force-editor', None, _('edit commit message (DEPRECATED)')),
('', 'switch-parent', None, _('switch parents when merging')),
] + commands.commitopts + commands.commitopts2 + commands.remoteopts,
_('hg fetch [SOURCE]')),
}