# hg.py - repository classes for mercurial

#

# Copyright 2005 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms

# of the GNU General Public License, incorporated herein by reference.

from node import *

from repo import *

from demandload import *

from i18n import gettext as _

demandload(globals(), "localrepo bundlerepo httprepo sshrepo statichttprepo")

demandload(globals(), "errno lock os shutil util")

def _local(path):

schemes = {

    'bundle': bundlerepo,

    'file': _local,

    'hg': httprepo,

    'http': httprepo,

    'https': httprepo,

    'old-http': statichttprepo,

    '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=None, create=False):

    return _lookup(path).instance(ui, path, create)

def defaultdest(source):

    '''return default destination of clone if none is given'''

    return os.path.basename(os.path.normpath(source))

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

    """

    if isinstance(source, str):

        src_repo = repository(ui, source)

    else:

        src_repo = source

        source = src_repo.url()

    if dest is None:

        dest = defaultdest(source)

    def localpath(path):

        if path.startswith('file://'):

            return path[7:]

        if path.startswith('file:'):

            return path[5:]

        return path

    dest = localpath(dest)

    source = localpath(source)

    if os.path.exists(dest):

        raise util.Abort(_("destination '%s' already exists"), dest)

    class DirCleanup(object):

        def __init__(self, dir_):

            self.rmtree = shutil.rmtree

            self.dir_ = dir_

        def close(self):

            self.dir_ = None

        def __del__(self):

            if self.dir_:

                self.rmtree(self.dir_, True)

    dest_repo = None

    try:

        dest_repo = repository(ui, dest)

        raise util.Abort(_("destination '%s' already exists." % dest))

    except RepoError:

        dest_repo = repository(ui, dest, create=True)

    dest_path = None

    dir_cleanup = None

    if dest_repo.local():

        dest_path = os.path.realpath(dest_repo.root)

        dir_cleanup = DirCleanup(dest_path)

    abspath = source

    copy = False

    if src_repo.local() and dest_repo.local():

        abspath = os.path.abspath(source)

        copy = not pull and not rev

    src_lock, dest_lock = None, None

    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 lock.LockException:

            copy = False

    if copy:

        # we lock here to avoid premature writing to the target

        dest_lock = lock.lock(os.path.join(dest_path, ".hg", "lock"))

        # we need to remove the (empty) data dir in dest so copyfiles

        # can do its work

        os.rmdir(os.path.join(dest_path, ".hg", "data"))

        files = "data 00manifest.d 00manifest.i 00changelog.d 00changelog.i"

        for f in files.split():

            src = os.path.join(source, ".hg", f)

            dst = os.path.join(dest_path, ".hg", f)

            try:

                util.copyfiles(src, dst)

            except OSError, inst:

                if inst.errno != errno.ENOENT:

                    raise

        # we need to re-init the repo after manually copying the data

        # into it

        dest_repo = repository(ui, dest)

    else:

        revs = None

        if rev:

            if not src_repo.local():

                raise util.Abort(_("clone by revision not supported yet "

                                   "for remote repositories"))

            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 src_lock:

        src_lock.release()

    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 dest_lock:

            dest_lock.release()

        if update:

            dest_repo.update(dest_repo.changelog.tip())

    if dir_cleanup:

        dir_cleanup.close()

    return src_repo, dest_repo