Mercurial > hg
view mercurial/discovery.py @ 14077:c285bdb0572a
util.url: copy urllib.unquote() into util to improve startup times
The ui class uses util.hasscheme() in a couple of places, causing hg
to import urllib even when it doesn't need to. This copies
urllib.unquote() to avoid that import.
perfstartup time before the URL refactoring (8796fb6af67e):
! wall 0.050692 comb 0.000000 user 0.000000 sys 0.000000 (best of 100)
before this change:
! wall 0.064742 comb 0.000000 user 0.000000 sys 0.000000 (best of 100)
after this change:
! wall 0.052126 comb 0.000000 user 0.000000 sys 0.000000 (best of 100
author | Brodie Rao <brodie@bitheap.org> |
---|---|
date | Sat, 30 Apr 2011 09:43:23 -0700 |
parents | 72c84f24b420 |
children | cb98fed52495 |
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# discovery.py - protocol changeset discovery functions # # Copyright 2010 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from node import nullid, short from i18n import _ import util, error def findcommonincoming(repo, remote, heads=None, force=False): """Return a tuple (common, anyincoming, heads) used to identify the common subset of nodes between repo and remote. "common" is a list of (at least) the heads of the common subset. "anyincoming" is testable as a boolean indicating if any nodes are missing locally. If remote does not support getbundle, this actually is a list of roots of the nodes that would be incoming, to be supplied to changegroupsubset. No code except for pull should be relying on this fact any longer. "heads" is either the supplied heads, or else the remote's heads. """ m = repo.changelog.nodemap search = [] fetch = set() seen = set() seenbranch = set() base = set() if not heads: heads = remote.heads() if repo.changelog.tip() == nullid: base.add(nullid) if heads != [nullid]: return [nullid], [nullid], list(heads) return [nullid], [], [] # assume we're closer to the tip than the root # and start by examining the heads repo.ui.status(_("searching for changes\n")) if remote.capable('getbundle'): myheads = repo.heads() known = remote.known(myheads) if util.all(known): hasincoming = set(heads).difference(set(myheads)) and True return myheads, hasincoming, heads unknown = [] for h in heads: if h not in m: unknown.append(h) else: base.add(h) heads = unknown if not unknown: return list(base), [], [] req = set(unknown) reqcnt = 0 # search through remote branches # a 'branch' here is a linear segment of history, with four parts: # head, root, first parent, second parent # (a branch always has two parents (or none) by definition) unknown = remote.branches(unknown) while unknown: r = [] while unknown: n = unknown.pop(0) if n[0] in seen: continue repo.ui.debug("examining %s:%s\n" % (short(n[0]), short(n[1]))) if n[0] == nullid: # found the end of the branch pass elif n in seenbranch: repo.ui.debug("branch already found\n") continue elif n[1] and n[1] in m: # do we know the base? repo.ui.debug("found incomplete branch %s:%s\n" % (short(n[0]), short(n[1]))) search.append(n[0:2]) # schedule branch range for scanning seenbranch.add(n) else: if n[1] not in seen and n[1] not in fetch: if n[2] in m and n[3] in m: repo.ui.debug("found new changeset %s\n" % short(n[1])) fetch.add(n[1]) # earliest unknown for p in n[2:4]: if p in m: base.add(p) # latest known for p in n[2:4]: if p not in req and p not in m: r.append(p) req.add(p) seen.add(n[0]) if r: reqcnt += 1 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) repo.ui.debug("request %d: %s\n" % (reqcnt, " ".join(map(short, r)))) for p in xrange(0, len(r), 10): for b in remote.branches(r[p:p + 10]): repo.ui.debug("received %s:%s\n" % (short(b[0]), short(b[1]))) unknown.append(b) # do binary search on the branches we found while search: newsearch = [] reqcnt += 1 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) for n, l in zip(search, remote.between(search)): l.append(n[1]) p = n[0] f = 1 for i in l: repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i))) if i in m: if f <= 2: repo.ui.debug("found new branch changeset %s\n" % short(p)) fetch.add(p) base.add(i) else: repo.ui.debug("narrowed branch search to %s:%s\n" % (short(p), short(i))) newsearch.append((p, i)) break p, f = i, f * 2 search = newsearch # sanity check our fetch list for f in fetch: if f in m: raise error.RepoError(_("already have changeset ") + short(f[:4])) base = list(base) if base == [nullid]: if force: repo.ui.warn(_("warning: repository is unrelated\n")) else: raise util.Abort(_("repository is unrelated")) repo.ui.debug("found new changesets starting at " + " ".join([short(f) for f in fetch]) + "\n") repo.ui.progress(_('searching'), None) repo.ui.debug("%d total queries\n" % reqcnt) return base, list(fetch), heads def prepush(repo, remote, force, revs, newbranch): '''Analyze the local and remote repositories and determine which changesets need to be pushed to the remote. Return value depends on circumstances: If we are not going to push anything, return a tuple (None, outgoing) where outgoing is 0 if there are no outgoing changesets and 1 if there are, but we refuse to push them (e.g. would create new remote heads). Otherwise, return a tuple (changegroup, remoteheads), where changegroup is a readable file-like object whose read() returns successive changegroup chunks ready to be sent over the wire and remoteheads is the list of remote heads.''' remoteheads = remote.heads() common, inc, _rheads = findcommonincoming(repo, remote, heads=remoteheads, force=force) cl = repo.changelog outg = cl.findmissing(common, revs) if not outg: repo.ui.status(_("no changes found\n")) return None, 1 if not force and remoteheads != [nullid]: if remote.capable('branchmap'): # Check for each named branch if we're creating new remote heads. # To be a remote head after push, node must be either: # - unknown locally # - a local outgoing head descended from update # - a remote head that's known locally and not # ancestral to an outgoing head # 1. Create set of branches involved in the push. branches = set(repo[n].branch() for n in outg) # 2. Check for new branches on the remote. remotemap = remote.branchmap() newbranches = branches - set(remotemap) if newbranches and not newbranch: # new branch requires --new-branch branchnames = ', '.join(sorted(newbranches)) raise util.Abort(_("push creates new remote branches: %s!") % branchnames, hint=_("use 'hg push --new-branch' to create" " new remote branches")) branches.difference_update(newbranches) # 3. Construct the initial oldmap and newmap dicts. # They contain information about the remote heads before and # after the push, respectively. # Heads not found locally are not included in either dict, # since they won't be affected by the push. # unsynced contains all branches with incoming changesets. oldmap = {} newmap = {} unsynced = set() for branch in branches: remotebrheads = remotemap[branch] prunedbrheads = [h for h in remotebrheads if h in cl.nodemap] oldmap[branch] = prunedbrheads newmap[branch] = list(prunedbrheads) if len(remotebrheads) > len(prunedbrheads): unsynced.add(branch) # 4. Update newmap with outgoing changes. # This will possibly add new heads and remove existing ones. ctxgen = (repo[n] for n in outg) repo._updatebranchcache(newmap, ctxgen) else: # 1-4b. old servers: Check for new topological heads. # Construct {old,new}map with branch = None (topological branch). # (code based on _updatebranchcache) oldheads = set(h for h in remoteheads if h in cl.nodemap) newheads = oldheads.union(outg) if len(newheads) > 1: for latest in reversed(outg): if latest not in newheads: continue minhrev = min(cl.rev(h) for h in newheads) reachable = cl.reachable(latest, cl.node(minhrev)) reachable.remove(latest) newheads.difference_update(reachable) branches = set([None]) newmap = {None: newheads} oldmap = {None: oldheads} unsynced = inc and branches or set() # 5. Check for new heads. # If there are more heads after the push than before, a suitable # error message, depending on unsynced status, is displayed. error = None for branch in branches: newhs = set(newmap[branch]) oldhs = set(oldmap[branch]) if len(newhs) > len(oldhs): if error is None: if branch: error = _("push creates new remote heads " "on branch '%s'!") % branch else: error = _("push creates new remote heads!") if branch in unsynced: hint = _("you should pull and merge or " "use push -f to force") else: hint = _("did you forget to merge? " "use push -f to force") if branch: repo.ui.debug("new remote heads on branch '%s'\n" % branch) for h in (newhs - oldhs): repo.ui.debug("new remote head %s\n" % short(h)) if error: raise util.Abort(error, hint=hint) # 6. Check for unsynced changes on involved branches. if unsynced: repo.ui.warn(_("note: unsynced remote changes!\n")) if revs is None: # use the fast path, no race possible on push cg = repo._changegroup(outg, 'push') else: cg = repo.getbundle('push', heads=revs, common=common) return cg, remoteheads