Mercurial > hg
view mercurial/discovery.py @ 12044:bcc7139521b7
bundlerepo: remove duplication of bundle decompressors
author | Matt Mackall <mpm@selenic.com> |
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date | Wed, 25 Aug 2010 16:55:54 -0500 |
parents | bb7af1de5e38 |
children | 9c5794223340 |
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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 findincoming(repo, remote, base=None, heads=None, force=False): """Return list of roots of the subsets of missing nodes from remote If base dict is specified, assume that these nodes and their parents exist on the remote side and that no child of a node of base exists in both remote and repo. Furthermore base will be updated to include the nodes that exists in repo and remote but no children exists in repo and remote. If a list of heads is specified, return only nodes which are heads or ancestors of these heads. All the ancestors of base are in repo and in remote. All the descendants of the list returned are missing in repo. (and so we know that the rest of the nodes are missing in remote, see outgoing) """ return findcommonincoming(repo, remote, base, heads, force)[1] def findcommonincoming(repo, remote, base=None, heads=None, force=False): """Return a tuple (common, missing roots, heads) used to identify missing nodes from remote. If base dict is specified, assume that these nodes and their parents exist on the remote side and that no child of a node of base exists in both remote and repo. Furthermore base will be updated to include the nodes that exists in repo and remote but no children exists in both repo and remote. In other words, base is the set of heads of the DAG resulting from the intersection of the nodes from repo and remote. If a list of heads is specified, return only nodes which are heads or ancestors of these heads. All the ancestors of base are in repo and in remote. """ m = repo.changelog.nodemap search = [] fetch = set() seen = set() seenbranch = set() if base is None: base = {} if not heads: heads = remote.heads() if repo.changelog.tip() == nullid: base[nullid] = 1 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")) unknown = [] for h in heads: if h not in m: unknown.append(h) else: base[h] = 1 heads = unknown if not unknown: return base.keys(), [], [] 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[p] = 1 # 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[i] = 1 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])) if base.keys() == [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.keys(), list(fetch), heads def findoutgoing(repo, remote, base=None, remoteheads=None, force=False): """Return list of nodes that are roots of subsets not in remote If base dict is specified, assume that these nodes and their parents exist on the remote side. If remotehead is specified, assume it is the list of the heads from the remote repository. """ if base is None: base = {} findincoming(repo, remote, base, remoteheads, force=force) repo.ui.debug("common changesets up to " + " ".join(map(short, base.keys())) + "\n") remain = set(repo.changelog.nodemap) # prune everything remote has from the tree remain.remove(nullid) remove = base.keys() while remove: n = remove.pop(0) if n in remain: remain.remove(n) for p in repo.changelog.parents(n): remove.append(p) # find every node whose parents have been pruned subset = [] # find every remote head that will get new children for n in remain: p1, p2 = repo.changelog.parents(n) if p1 not in remain and p2 not in remain: subset.append(n) return subset 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.''' common = {} remoteheads = remote.heads() inc = findincoming(repo, remote, common, remoteheads, force=force) cl = repo.changelog update = findoutgoing(repo, remote, common, remoteheads) outg, bases, heads = cl.nodesbetween(update, revs) if not bases: 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 # # New named branches cannot be created without --force. # 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 # warning, depending on unsynced status, is displayed. for branch in branches: if len(newmap[branch]) > len(oldmap[branch]): if branch: msg = _("push creates new remote heads " "on branch '%s'!") % branch else: msg = _("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") raise util.Abort(msg, 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 nodes = repo.changelog.findmissing(common.keys()) cg = repo._changegroup(nodes, 'push') else: cg = repo.changegroupsubset(update, revs, 'push') return cg, remoteheads