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def validate_version(base_version, vcs_info):

    branch = vcs_info.branch

    brnorm = utils.normalize_branch_name(branch)

    btypestr = utils.get_branch_type(branch)

    try:

        btype = BRANCH_TYPES[btypestr]

    except KeyError:

        allowed_branches = ", ".join(x for x in BRANCH_TYPES.keys())

        raise ValueError("Malformed branch name '%s', cannot classify as one "

                         "of %s" % (btypestr, allowed_branches))

    if btype.versioned:

        try:

            bverstr = brnorm.split("-")[1]

        except IndexError:

            # No version

            raise ValueError("Branch name '%s' should contain version" %

                             branch)

        # Check that version is well-formed

        if not re.match(VERSION_RE, bverstr):

            raise ValueError("Malformed version '%s' in branch name '%s'" %

                             (bverstr, branch))

    m = re.match(btype.allowed_version_re, base_version)

    if not m or (btype.versioned and m.groupdict()["bverstr"] != bverstr):

        raise ValueError("Base version '%s' unsuitable for branch name '%s'" %

                         (base_version, branch))

    validate_version(base_version, vcs_info)

    #this cannot fail

    btype = BRANCH_TYPES[btypestr]