view mercurial/hg.py @ 8294:48a382c23226

transaction: refactor transaction.abort and rollback to use the same code

This adds a change to the way that abort is processed, as it will not continue
truncating files beyond the first failure, otherwise the respective
functionality is maintained, i.e. abort will not unlink files, but rollback
will.

Co-contributor: Sune Foldager <[e-mail]>

# hg.py - repository classes for mercurial
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
# Copyright 2006 Vadim Gelfer <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

from i18n import _
from lock import release
import localrepo, bundlerepo, httprepo, sshrepo, statichttprepo
import errno, lock, os, shutil, util, extensions, error
import merge as _merge
import verify as _verify

def _local(path):
    return (os.path.isfile(util.drop_scheme('file', path)) and
            bundlerepo or localrepo)

def parseurl(url, revs=[]):
    '''parse url#branch, returning url, branch + revs'''

    if '#' not in url:
        return url, (revs or None), revs and revs[-1] or None

    url, branch = url.split('#', 1)
    checkout = revs and revs[-1] or branch
    return url, (revs or []) + [branch], checkout

schemes = {
    'bundle': bundlerepo,
    'file': _local,
    'http': httprepo,
    'https': httprepo,
    'ssh': sshrepo,
    'static-http': statichttprepo,
}

def _lookup(path):
    scheme = 'file'
    if path:
        c = path.find(':')
        if c > 0:
            scheme = path[:c]
    thing = schemes.get(scheme) or schemes['file']
    try:
        return thing(path)
    except TypeError:
        return thing

def islocal(repo):
    '''return true if repo or path is local'''
    if isinstance(repo, str):
        try:
            return _lookup(repo).islocal(repo)
        except AttributeError:
            return False
    return repo.local()

def repository(ui, path='', create=False):
    """return a repository object for the specified path"""
    repo = _lookup(path).instance(ui, path, create)
    ui = getattr(repo, "ui", ui)
    for name, module in extensions.extensions():
        hook = getattr(module, 'reposetup', None)
        if hook:
            hook(ui, repo)
    return repo

def defaultdest(source):
    '''return default destination of clone if none is given'''
    return os.path.basename(os.path.normpath(source))

def localpath(path):
    if path.startswith('file://localhost/'):
        return path[16:]
    if path.startswith('file://'):
        return path[7:]
    if path.startswith('file:'):
        return path[5:]
    return path

def clone(ui, source, dest=None, pull=False, rev=None, update=True,
          stream=False):
    """Make a copy of an existing repository.

    Create a copy of an existing repository in a new directory.  The
    source and destination are URLs, as passed to the repository
    function.  Returns a pair of repository objects, the source and
    newly created destination.

    The location of the source is added to the new repository's
    .hg/hgrc file, as the default to be used for future pulls and
    pushes.

    If an exception is raised, the partly cloned/updated destination
    repository will be deleted.

    Arguments:

    source: repository object or URL

    dest: URL of destination repository to create (defaults to base
    name of source repository)

    pull: always pull from source repository, even in local case

    stream: stream raw data uncompressed from repository (fast over
    LAN, slow over WAN)

    rev: revision to clone up to (implies pull=True)

    update: update working directory after clone completes, if
    destination is local repository (True means update to default rev,
    anything else is treated as a revision)
    """

    if isinstance(source, str):
        origsource = ui.expandpath(source)
        source, rev, checkout = parseurl(origsource, rev)
        src_repo = repository(ui, source)
    else:
        src_repo = source
        origsource = source = src_repo.url()
        checkout = rev and rev[-1] or None

    if dest is None:
        dest = defaultdest(source)
        ui.status(_("destination directory: %s\n") % dest)

    dest = localpath(dest)
    source = localpath(source)

    if os.path.exists(dest):
        if not os.path.isdir(dest):
            raise util.Abort(_("destination '%s' already exists") % dest)
        elif os.listdir(dest):
            raise util.Abort(_("destination '%s' is not empty") % dest)

    class DirCleanup(object):
        def __init__(self, dir_):
            self.rmtree = shutil.rmtree
            self.dir_ = dir_
        def close(self):
            self.dir_ = None
        def cleanup(self):
            if self.dir_:
                self.rmtree(self.dir_, True)

    src_lock = dest_lock = dir_cleanup = None
    try:
        if islocal(dest):
            dir_cleanup = DirCleanup(dest)

        abspath = origsource
        copy = False
        if src_repo.cancopy() and islocal(dest):
            abspath = os.path.abspath(util.drop_scheme('file', origsource))
            copy = not pull and not rev

        if copy:
            try:
                # we use a lock here because if we race with commit, we
                # can end up with extra data in the cloned revlogs that's
                # not pointed to by changesets, thus causing verify to
                # fail
                src_lock = src_repo.lock()
            except error.LockError:
                copy = False

        if copy:
            hgdir = os.path.realpath(os.path.join(dest, ".hg"))
            if not os.path.exists(dest):
                os.mkdir(dest)
            else:
                # only clean up directories we create ourselves
                dir_cleanup.dir_ = hgdir
            try:
                dest_path = hgdir
                os.mkdir(dest_path)
            except OSError, inst:
                if inst.errno == errno.EEXIST:
                    dir_cleanup.close()
                    raise util.Abort(_("destination '%s' already exists")
                                     % dest)
                raise

            for f in src_repo.store.copylist():
                src = os.path.join(src_repo.path, f)
                dst = os.path.join(dest_path, f)
                dstbase = os.path.dirname(dst)
                if dstbase and not os.path.exists(dstbase):
                    os.mkdir(dstbase)
                if os.path.exists(src):
                    if dst.endswith('data'):
                        # lock to avoid premature writing to the target
                        dest_lock = lock.lock(os.path.join(dstbase, "lock"))
                    util.copyfiles(src, dst)

            # we need to re-init the repo after manually copying the data
            # into it
            dest_repo = repository(ui, dest)

        else:
            try:
                dest_repo = repository(ui, dest, create=True)
            except OSError, inst:
                if inst.errno == errno.EEXIST:
                    dir_cleanup.close()
                    raise util.Abort(_("destination '%s' already exists")
                                     % dest)
                raise

            revs = None
            if rev:
                if 'lookup' not in src_repo.capabilities:
                    raise util.Abort(_("src repository does not support revision "
                                       "lookup and so doesn't support clone by "
                                       "revision"))
                revs = [src_repo.lookup(r) for r in rev]

            if dest_repo.local():
                dest_repo.clone(src_repo, heads=revs, stream=stream)
            elif src_repo.local():
                src_repo.push(dest_repo, revs=revs)
            else:
                raise util.Abort(_("clone from remote to remote not supported"))

        if dir_cleanup:
            dir_cleanup.close()

        if dest_repo.local():
            fp = dest_repo.opener("hgrc", "w", text=True)
            fp.write("[paths]\n")
            fp.write("default = %s\n" % abspath)
            fp.close()

            if update:
                dest_repo.ui.status(_("updating working directory\n"))
                if update is not True:
                    checkout = update
                for test in (checkout, 'default', 'tip'):
                    try:
                        uprev = dest_repo.lookup(test)
                        break
                    except:
                        continue
                _update(dest_repo, uprev)

        return src_repo, dest_repo
    finally:
        release(src_lock, dest_lock)
        if dir_cleanup is not None:
            dir_cleanup.cleanup()

def _showstats(repo, stats):
    stats = ((stats[0], _("updated")),
             (stats[1], _("merged")),
             (stats[2], _("removed")),
             (stats[3], _("unresolved")))
    note = ", ".join([_("%d files %s") % s for s in stats])
    repo.ui.status("%s\n" % note)

def update(repo, node):
    """update the working directory to node, merging linear changes"""
    stats = _merge.update(repo, node, False, False, None)
    _showstats(repo, stats)
    if stats[3]:
        repo.ui.status(_("use 'hg resolve' to retry unresolved file merges\n"))
    return stats[3] > 0

# naming conflict in clone()
_update = update

def clean(repo, node, show_stats=True):
    """forcibly switch the working directory to node, clobbering changes"""
    stats = _merge.update(repo, node, False, True, None)
    if show_stats: _showstats(repo, stats)
    return stats[3] > 0

def merge(repo, node, force=None, remind=True):
    """branch merge with node, resolving changes"""
    stats = _merge.update(repo, node, True, force, False)
    _showstats(repo, stats)
    if stats[3]:
        repo.ui.status(_("use 'hg resolve' to retry unresolved file merges "
                         "or 'hg up --clean' to abandon\n"))
    elif remind:
        repo.ui.status(_("(branch merge, don't forget to commit)\n"))
    return stats[3] > 0

def revert(repo, node, choose):
    """revert changes to revision in node without updating dirstate"""
    return _merge.update(repo, node, False, True, choose)[3] > 0

def verify(repo):
    """verify the consistency of a repository"""
    return _verify.verify(repo)