hgext/convert/hg.py

rebase: block collapse with keepbranches on multiple named branches (issue2112)

Collapse and keepbranches should be blocked when there is more than
one named branch on the branch that's going to be rebased.

# hg.py - hg backend for convert extension
#
#  Copyright 2005-2009 Matt Mackall <[e-mail]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

# Notes for hg->hg conversion:
#
# * Old versions of Mercurial didn't trim the whitespace from the ends
#   of commit messages, but new versions do.  Changesets created by
#   those older versions, then converted, may thus have different
#   hashes for changesets that are otherwise identical.
#
# * Using "--config convert.hg.saverev=true" will make the source
#   identifier to be stored in the converted revision. This will cause
#   the converted revision to have a different identity than the
#   source.


import os, time, cStringIO
from mercurial.i18n import _
from mercurial.node import bin, hex, nullid
from mercurial import hg, util, context, bookmarks, error

from common import NoRepo, commit, converter_source, converter_sink

class mercurial_sink(converter_sink):
    def __init__(self, ui, path):
        converter_sink.__init__(self, ui, path)
        self.branchnames = ui.configbool('convert', 'hg.usebranchnames', True)
        self.clonebranches = ui.configbool('convert', 'hg.clonebranches', False)
        self.tagsbranch = ui.config('convert', 'hg.tagsbranch', 'default')
        self.lastbranch = None
        if os.path.isdir(path) and len(os.listdir(path)) > 0:
            try:
                self.repo = hg.repository(self.ui, path)
                if not self.repo.local():
                    raise NoRepo(_('%s is not a local Mercurial repository')
                                 % path)
            except error.RepoError, err:
                ui.traceback()
                raise NoRepo(err.args[0])
        else:
            try:
                ui.status(_('initializing destination %s repository\n') % path)
                self.repo = hg.repository(self.ui, path, create=True)
                if not self.repo.local():
                    raise NoRepo(_('%s is not a local Mercurial repository')
                                 % path)
                self.created.append(path)
            except error.RepoError:
                ui.traceback()
                raise NoRepo(_("could not create hg repository %s as sink")
                             % path)
        self.lock = None
        self.wlock = None
        self.filemapmode = False

    def before(self):
        self.ui.debug('run hg sink pre-conversion action\n')
        self.wlock = self.repo.wlock()
        self.lock = self.repo.lock()

    def after(self):
        self.ui.debug('run hg sink post-conversion action\n')
        if self.lock:
            self.lock.release()
        if self.wlock:
            self.wlock.release()

    def revmapfile(self):
        return os.path.join(self.path, ".hg", "shamap")

    def authorfile(self):
        return os.path.join(self.path, ".hg", "authormap")

    def getheads(self):
        h = self.repo.changelog.heads()
        return [hex(x) for x in h]

    def setbranch(self, branch, pbranches):
        if not self.clonebranches:
            return

        setbranch = (branch != self.lastbranch)
        self.lastbranch = branch
        if not branch:
            branch = 'default'
        pbranches = [(b[0], b[1] and b[1] or 'default') for b in pbranches]
        pbranch = pbranches and pbranches[0][1] or 'default'

        branchpath = os.path.join(self.path, branch)
        if setbranch:
            self.after()
            try:
                self.repo = hg.repository(self.ui, branchpath)
            except:
                self.repo = hg.repository(self.ui, branchpath, create=True)
            self.before()

        # pbranches may bring revisions from other branches (merge parents)
        # Make sure we have them, or pull them.
        missings = {}
        for b in pbranches:
            try:
                self.repo.lookup(b[0])
            except:
                missings.setdefault(b[1], []).append(b[0])

        if missings:
            self.after()
            for pbranch, heads in missings.iteritems():
                pbranchpath = os.path.join(self.path, pbranch)
                prepo = hg.peer(self.ui, {}, pbranchpath)
                self.ui.note(_('pulling from %s into %s\n') % (pbranch, branch))
                self.repo.pull(prepo, [prepo.lookup(h) for h in heads])
            self.before()

    def _rewritetags(self, source, revmap, data):
        fp = cStringIO.StringIO()
        for line in data.splitlines():
            s = line.split(' ', 1)
            if len(s) != 2:
                continue
            revid = revmap.get(source.lookuprev(s[0]))
            if not revid:
                continue
            fp.write('%s %s\n' % (revid, s[1]))
        return fp.getvalue()

    def putcommit(self, files, copies, parents, commit, source, revmap):

        files = dict(files)
        def getfilectx(repo, memctx, f):
            v = files[f]
            data, mode = source.getfile(f, v)
            if f == '.hgtags':
                data = self._rewritetags(source, revmap, data)
            return context.memfilectx(f, data, 'l' in mode, 'x' in mode,
                                      copies.get(f))

        pl = []
        for p in parents:
            if p not in pl:
                pl.append(p)
        parents = pl
        nparents = len(parents)
        if self.filemapmode and nparents == 1:
            m1node = self.repo.changelog.read(bin(parents[0]))[0]
            parent = parents[0]

        if len(parents) < 2:
            parents.append(nullid)
        if len(parents) < 2:
            parents.append(nullid)
        p2 = parents.pop(0)

        text = commit.desc
        extra = commit.extra.copy()
        if self.branchnames and commit.branch:
            extra['branch'] = commit.branch
        if commit.rev:
            extra['convert_revision'] = commit.rev

        while parents:
            p1 = p2
            p2 = parents.pop(0)
            ctx = context.memctx(self.repo, (p1, p2), text, files.keys(),
                                 getfilectx, commit.author, commit.date, extra)
            self.repo.commitctx(ctx)
            text = "(octopus merge fixup)\n"
            p2 = hex(self.repo.changelog.tip())

        if self.filemapmode and nparents == 1:
            man = self.repo.manifest
            mnode = self.repo.changelog.read(bin(p2))[0]
            closed = 'close' in commit.extra
            if not closed and not man.cmp(m1node, man.revision(mnode)):
                self.ui.status(_("filtering out empty revision\n"))
                self.repo.rollback()
                return parent
        return p2

    def puttags(self, tags):
        try:
            parentctx = self.repo[self.tagsbranch]
            tagparent = parentctx.node()
        except error.RepoError:
            parentctx = None
            tagparent = nullid

        try:
            oldlines = sorted(parentctx['.hgtags'].data().splitlines(True))
        except:
            oldlines = []

        newlines = sorted([("%s %s\n" % (tags[tag], tag)) for tag in tags])
        if newlines == oldlines:
            return None, None
        data = "".join(newlines)
        def getfilectx(repo, memctx, f):
            return context.memfilectx(f, data, False, False, None)

        self.ui.status(_("updating tags\n"))
        date = "%s 0" % int(time.mktime(time.gmtime()))
        extra = {'branch': self.tagsbranch}
        ctx = context.memctx(self.repo, (tagparent, None), "update tags",
                             [".hgtags"], getfilectx, "convert-repo", date,
                             extra)
        self.repo.commitctx(ctx)
        return hex(self.repo.changelog.tip()), hex(tagparent)

    def setfilemapmode(self, active):
        self.filemapmode = active

    def putbookmarks(self, updatedbookmark):
        if not len(updatedbookmark):
            return

        self.ui.status(_("updating bookmarks\n"))
        for bookmark in updatedbookmark:
            self.repo._bookmarks[bookmark] = bin(updatedbookmark[bookmark])
            bookmarks.write(self.repo)


class mercurial_source(converter_source):
    def __init__(self, ui, path, rev=None):
        converter_source.__init__(self, ui, path, rev)
        self.ignoreerrors = ui.configbool('convert', 'hg.ignoreerrors', False)
        self.ignored = set()
        self.saverev = ui.configbool('convert', 'hg.saverev', False)
        try:
            self.repo = hg.repository(self.ui, path)
            # try to provoke an exception if this isn't really a hg
            # repo, but some other bogus compatible-looking url
            if not self.repo.local():
                raise error.RepoError()
        except error.RepoError:
            ui.traceback()
            raise NoRepo(_("%s is not a local Mercurial repository") % path)
        self.lastrev = None
        self.lastctx = None
        self._changescache = None
        self.convertfp = None
        # Restrict converted revisions to startrev descendants
        startnode = ui.config('convert', 'hg.startrev')
        if startnode is not None:
            try:
                startnode = self.repo.lookup(startnode)
            except error.RepoError:
                raise util.Abort(_('%s is not a valid start revision')
                                 % startnode)
            startrev = self.repo.changelog.rev(startnode)
            children = {startnode: 1}
            for rev in self.repo.changelog.descendants(startrev):
                children[self.repo.changelog.node(rev)] = 1
            self.keep = children.__contains__
        else:
            self.keep = util.always

    def changectx(self, rev):
        if self.lastrev != rev:
            self.lastctx = self.repo[rev]
            self.lastrev = rev
        return self.lastctx

    def parents(self, ctx):
        return [p for p in ctx.parents() if p and self.keep(p.node())]

    def getheads(self):
        if self.rev:
            heads = [self.repo[self.rev].node()]
        else:
            heads = self.repo.heads()
        return [hex(h) for h in heads if self.keep(h)]

    def getfile(self, name, rev):
        try:
            fctx = self.changectx(rev)[name]
            return fctx.data(), fctx.flags()
        except error.LookupError, err:
            raise IOError(err)

    def getchanges(self, rev):
        ctx = self.changectx(rev)
        parents = self.parents(ctx)
        if not parents:
            files = sorted(ctx.manifest())
            # getcopies() is not needed for roots, but it is a simple way to
            # detect missing revlogs and abort on errors or populate self.ignored
            self.getcopies(ctx, parents, files)
            return [(f, rev) for f in files if f not in self.ignored], {}
        if self._changescache and self._changescache[0] == rev:
            m, a, r = self._changescache[1]
        else:
            m, a, r = self.repo.status(parents[0].node(), ctx.node())[:3]
        # getcopies() detects missing revlogs early, run it before
        # filtering the changes.
        copies = self.getcopies(ctx, parents, m + a)
        changes = [(name, rev) for name in m + a + r
                   if name not in self.ignored]
        return sorted(changes), copies

    def getcopies(self, ctx, parents, files):
        copies = {}
        for name in files:
            if name in self.ignored:
                continue
            try:
                copysource, copynode = ctx.filectx(name).renamed()
                if copysource in self.ignored or not self.keep(copynode):
                    continue
                # Ignore copy sources not in parent revisions
                found = False
                for p in parents:
                    if copysource in p:
                        found = True
                        break
                if not found:
                    continue
                copies[name] = copysource
            except TypeError:
                pass
            except error.LookupError, e:
                if not self.ignoreerrors:
                    raise
                self.ignored.add(name)
                self.ui.warn(_('ignoring: %s\n') % e)
        return copies

    def getcommit(self, rev):
        ctx = self.changectx(rev)
        parents = [p.hex() for p in self.parents(ctx)]
        if self.saverev:
            crev = rev
        else:
            crev = None
        return commit(author=ctx.user(), date=util.datestr(ctx.date()),
                      desc=ctx.description(), rev=crev, parents=parents,
                      branch=ctx.branch(), extra=ctx.extra(),
                      sortkey=ctx.rev())

    def gettags(self):
        tags = [t for t in self.repo.tagslist() if t[0] != 'tip']
        return dict([(name, hex(node)) for name, node in tags
                     if self.keep(node)])

    def getchangedfiles(self, rev, i):
        ctx = self.changectx(rev)
        parents = self.parents(ctx)
        if not parents and i is None:
            i = 0
            changes = [], ctx.manifest().keys(), []
        else:
            i = i or 0
            changes = self.repo.status(parents[i].node(), ctx.node())[:3]
        changes = [[f for f in l if f not in self.ignored] for l in changes]

        if i == 0:
            self._changescache = (rev, changes)

        return changes[0] + changes[1] + changes[2]

    def converted(self, rev, destrev):
        if self.convertfp is None:
            self.convertfp = open(os.path.join(self.path, '.hg', 'shamap'),
                                  'a')
        self.convertfp.write('%s %s\n' % (destrev, rev))
        self.convertfp.flush()

    def before(self):
        self.ui.debug('run hg source pre-conversion action\n')

    def after(self):
        self.ui.debug('run hg source post-conversion action\n')

    def hasnativeorder(self):
        return True

    def lookuprev(self, rev):
        try:
            return hex(self.repo.lookup(rev))
        except error.RepoError:
            return None

    def getbookmarks(self):
        return bookmarks.listbookmarks(self.repo)