# hg.py - repository classes for mercurial

#

# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.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 i18n import _

from lock import release

from node import hex, nullid, nullrev, short

import localrepo, bundlerepo, httprepo, sshrepo, statichttprepo

import lock, util, extensions, error, encoding, node

import cmdutil, discovery, url

import merge as mergemod

import verify as verifymod

import errno, os, shutil

def _local(path):

    path = util.expandpath(util.drop_scheme('file', path))

    return (os.path.isfile(path) and bundlerepo or localrepo)

def addbranchrevs(lrepo, repo, branches, revs):

    hashbranch, branches = branches

    if not hashbranch and not branches:

        return revs or None, revs and revs[0] or None

    revs = revs and list(revs) or []

    if not repo.capable('branchmap'):

        if branches:

            raise util.Abort(_("remote branch lookup not supported"))

        revs.append(hashbranch)

        return revs, revs[0]

    branchmap = repo.branchmap()

    def primary(branch):

        if branch == '.':

            if not lrepo or not lrepo.local():

                raise util.Abort(_("dirstate branch not accessible"))

            branch = lrepo.dirstate.branch()

        if branch in branchmap:

            revs.extend(node.hex(r) for r in reversed(branchmap[branch]))

            return True

        else:

            return False

    for branch in branches:

        if not primary(branch):

            raise error.RepoLookupError(_("unknown branch '%s'") % branch)

    if hashbranch:

        if not primary(hashbranch):

            revs.append(hashbranch)

    return revs, revs[0]

def parseurl(url, branches=None):

    '''parse url#branch, returning (url, (branch, branches))'''

    if '#' not in url:

        return url, (None, branches or [])

    url, branch = url.split('#', 1)

    return url, (branch, branches or [])

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 share(ui, source, dest=None, update=True):

    '''create a shared repository'''

    if not islocal(source):

        raise util.Abort(_('can only share local repositories'))

    if not dest:

        dest = defaultdest(source)

    else:

        dest = ui.expandpath(dest)

    if isinstance(source, str):

        origsource = ui.expandpath(source)

        source, branches = parseurl(origsource)

        srcrepo = repository(ui, source)

        rev, checkout = addbranchrevs(srcrepo, srcrepo, branches, None)

    else:

        srcrepo = source

        origsource = source = srcrepo.url()

        checkout = None

    sharedpath = srcrepo.sharedpath # if our source is already sharing

    root = os.path.realpath(dest)

    roothg = os.path.join(root, '.hg')

    if os.path.exists(roothg):

        raise util.Abort(_('destination already exists'))

    if not os.path.isdir(root):

        os.mkdir(root)

    os.mkdir(roothg)

    requirements = ''

    try:

        requirements = srcrepo.opener('requires').read()

    except IOError, inst:

        if inst.errno != errno.ENOENT:

            raise

    requirements += 'shared\n'

    file(os.path.join(roothg, 'requires'), 'w').write(requirements)

    file(os.path.join(roothg, 'sharedpath'), 'w').write(sharedpath)

    default = srcrepo.ui.config('paths', 'default')

    if default:

        f = file(os.path.join(roothg, 'hgrc'), 'w')

        f.write('[paths]\ndefault = %s\n' % default)

        f.close()

    r = repository(ui, root)

    if update:

        r.ui.status(_("updating working directory\n"))

        if update is not True:

            checkout = update

        for test in (checkout, 'default', 'tip'):

            if test is None:

                continue

            try:

                uprev = r.lookup(test)

                break

            except error.RepoLookupError:

                continue

        _update(r, uprev)

def clone(ui, source, dest=None, pull=False, rev=None, update=True,

          stream=False, branch=None):

    """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)

    branch: branches to clone

    """

    if isinstance(source, str):

        origsource = ui.expandpath(source)

        source, branch = parseurl(origsource, branch)

        src_repo = repository(ui, source)

    else:

        src_repo = source

        branch = (None, branch or [])

        origsource = source = src_repo.url()

    rev, checkout = addbranchrevs(src_repo, src_repo, branch, rev)

    if dest is None:

        dest = defaultdest(source)

        ui.status(_("destination directory: %s\n") % dest)

    else:

        dest = ui.expandpath(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(wait=False)

            except error.LockError:

                copy = False

        if copy:

            src_repo.hook('preoutgoing', throw=True, source='clone')

            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

            hardlink = None

            num = 0

            for f in src_repo.store.copylist():

                src = os.path.join(src_repo.sharedpath, 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"))

                    hardlink, n = util.copyfiles(src, dst, hardlink)

                    num += n

            if hardlink:

                ui.debug("linked %d files\n" % num)

            else:

                ui.debug("copied %d files\n" % num)

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

            # into it

            dest_repo = repository(ui, dest)

            src_repo.hook('outgoing', source='clone',

                          node=node.hex(node.nullid))

        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]

                checkout = revs[0]

            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()

            dest_repo.ui.setconfig('paths', 'default', abspath)

            if update:

                if update is not True:

                    checkout = update

                    if src_repo.local():

                        checkout = src_repo.lookup(update)

                for test in (checkout, 'default', 'tip'):

                    if test is None:

                        continue

                    try:

                        uprev = dest_repo.lookup(test)

                        break

                    except error.RepoLookupError:

                        continue

                bn = dest_repo[uprev].branch()

                dest_repo.ui.status(_("updating to branch %s\n") % bn)