Mercurial > hg
view mercurial/treediscovery.py @ 51099:eba138890c64
revlog: move entry writing in the inner object
This is the second big piece of API we want to live on the inner object. With
this the inner object have freedom it needs to implement things internally.
(except for the delayed write feature of the changelog, that will be migrated in coming changesets)
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 19 Oct 2023 05:19:55 +0200 |
parents | f64f66167afc |
children |
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# discovery.py - protocol changeset discovery functions # # Copyright 2010 Olivia Mackall <olivia@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. import collections from .i18n import _ from .node import short from . import ( error, ) def findcommonincoming(repo, remote, heads=None, force=False, audit=None): """Return a tuple (common, fetch, 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. "fetch" is a list of roots of the nodes that would be incoming, to be supplied to changegroupsubset. "heads" is either the supplied heads, or else the remote's heads. """ knownnode = repo.changelog.hasnode search = [] fetch = set() seen = set() seenbranch = set() base = set() if not heads: with remote.commandexecutor() as e: heads = e.callcommand(b'heads', {}).result() if audit is not None: audit[b'total-roundtrips'] = 1 audit[b'total-roundtrips-heads'] = 1 audit[b'total-roundtrips-branches'] = 0 audit[b'total-roundtrips-between'] = 0 audit[b'total-queries'] = 0 audit[b'total-queries-branches'] = 0 audit[b'total-queries-between'] = 0 if repo.changelog.tip() == repo.nullid: base.add(repo.nullid) if heads != [repo.nullid]: return [repo.nullid], [repo.nullid], list(heads) return [repo.nullid], [], heads # assume we're closer to the tip than the root # and start by examining the heads repo.ui.status(_(b"searching for changes\n")) unknown = [] for h in heads: if not knownnode(h): unknown.append(h) else: base.add(h) if not unknown: return list(base), [], list(heads) req = set(unknown) reqcnt = 0 progress = repo.ui.makeprogress(_(b'searching'), unit=_(b'queries')) # 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) with remote.commandexecutor() as e: if audit is not None: audit[b'total-queries'] += len(unknown) audit[b'total-queries-branches'] += len(unknown) audit[b'total-roundtrips'] += 1 audit[b'total-roundtrips-branches'] += 1 branches = e.callcommand(b'branches', {b'nodes': unknown}).result() unknown = collections.deque(branches) while unknown: r = [] while unknown: n = unknown.popleft() if n[0] in seen: continue repo.ui.debug(b"examining %s:%s\n" % (short(n[0]), short(n[1]))) if n[0] == repo.nullid: # found the end of the branch pass elif n in seenbranch: repo.ui.debug(b"branch already found\n") continue elif n[1] and knownnode(n[1]): # do we know the base? repo.ui.debug( b"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 knownnode(n[2]) and knownnode(n[3]): repo.ui.debug(b"found new changeset %s\n" % short(n[1])) fetch.add(n[1]) # earliest unknown for p in n[2:4]: if knownnode(p): base.add(p) # latest known for p in n[2:4]: if p not in req and not knownnode(p): r.append(p) req.add(p) seen.add(n[0]) if r: for p in range(0, len(r), 10): reqcnt += 1 progress.increment() if repo.ui.debugflag: msg = b"request %d: %s\n" msg %= (reqcnt, b" ".join(map(short, r))) repo.ui.debug(msg) with remote.commandexecutor() as e: subset = r[p : p + 10] if audit is not None: audit[b'total-queries'] += len(subset) audit[b'total-queries-branches'] += len(subset) audit[b'total-roundtrips'] += 1 audit[b'total-roundtrips-branches'] += 1 branches = e.callcommand( b'branches', { b'nodes': subset, }, ).result() for b in branches: repo.ui.debug( b"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 progress.increment() with remote.commandexecutor() as e: if audit is not None: audit[b'total-queries'] += len(search) audit[b'total-queries-between'] += len(search) audit[b'total-roundtrips'] += 1 audit[b'total-roundtrips-between'] += 1 between = e.callcommand(b'between', {b'pairs': search}).result() for n, l in zip(search, between): l.append(n[1]) p = n[0] f = 1 for i in l: repo.ui.debug(b"narrowing %d:%d %s\n" % (f, len(l), short(i))) if knownnode(i): if f <= 2: repo.ui.debug( b"found new branch changeset %s\n" % short(p) ) fetch.add(p) base.add(i) else: repo.ui.debug( b"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 knownnode(f): raise error.RepoError(_(b"already have changeset ") + short(f[:4])) base = list(base) if base == [repo.nullid]: if force: repo.ui.warn(_(b"warning: repository is unrelated\n")) else: raise error.Abort(_(b"repository is unrelated")) repo.ui.debug( b"found new changesets starting at " + b" ".join([short(f) for f in fetch]) + b"\n" ) progress.complete() repo.ui.debug(b"%d total queries\n" % reqcnt) return base, list(fetch), heads