fix copy implementation.

    '''

    Copy an image from a repository to another one

    '''

    args.repo_filter = args.repo_src

    # load repositories

    repoman = load_repositories(args)

    repo_src = select_one_repository(repoman)

    args.repo_filter = args.repo_dst

    repoman = load_repositories(args)

    repo_dst = select_one_repository(repoman)

    if args.image_version is None:

        args.image_version = repo_src.last(args.image)

        if args.image_version == -1:

            raise Exception("Unable to find last version of %s" % args.image)

    arrow("Copying %s v%s from %s to %s" % (args.image, args.image_version,

                                   repo_src.config.name, repo_dst.config.name))

    srcrepo = repoman[args.repo_src]

    dstrepo = repoman[args.repo_dst]

    # load source image

    srcimg = srcrepo.get(args.image, args.image_version)

    # Advertise

    arrow("Copying %s v%s from %s to %s" % (srcimg.name,

                                             srcimg.version,

                                             srcrepo.config.name,

                                             dstrepo.config.name))

    arrowlevel(1)

    pkg = repo_src.get(args.image, args.image_version)

    repo_dst.add(pkg)

    dstrepo.add(srcimg)

    arrowlevel(-1)

    arrow("Done")

def c_help(parser, args):

    '''

        '''

        return self.db.ask("SELECT name,version FROM image WHERE name = ? AND version = ? LIMIT 1", (name,version)).fetchone() is not None

    def get(self, name, version):

    def get(self, name, version=None):

        '''

        Return an image from a name and version

        '''

        # is no version take the last

        if version is None:

            version = self.last(name)

        # get file md5 from db

        r = self.db.ask("select md5 from image where name = ? and version = ? limit 1",

                        (name,version)).fetchone()

        '''

        Return a repostiory by its position in list

        '''

        if type(key) == int:

            return self.repos[key]

        elif type(key) == str:

            for repo in self.repos:

                if repo.config.name == key:

                    return repo

            raise Exception("No repository named: %s" % key)

        else:

            raise TypeError

    def register(self, config):

        '''