# vim: set fileencoding=utf-8 :
#
# (C) 2012 Intel Corporation <markus.lehtonen@linux.intel.com>
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, please see
#    <http://www.gnu.org/licenses/>
"""Default packaging policy for RPM"""

import re
from gbp.pkg import PkgPolicy, parse_archive_filename

class RpmPkgPolicy(PkgPolicy):
    """Packaging policy for RPM"""

    # Special rpmlib python module for GBP (only)
    python_rpmlib_module_name = "rpm"

    alnum = 'a-zA-Z0-9'
    # Valid characters for RPM pkg name
    name_whitelist_chars = '._+%{}\-'
    # Valid characters for RPM pkg version
    version_whitelist_chars = '._+%{}~'

    # Regexp for checking the validity of package name
    packagename_re = re.compile("^[%s][%s%s]+$" %
                                        (alnum, alnum, name_whitelist_chars))
    packagename_msg = ("Package names must be at least two characters long, "
                       "start with an alphanumeric and can only contain "
                       "alphanumerics or characters in %s" %
                            list(name_whitelist_chars))

    # Regexp for checking the validity of package (upstream) version
    upstreamversion_re = re.compile("^[0-9][%s%s]*$" %
                                        (alnum, version_whitelist_chars))
    upstreamversion_msg = ("Upstream version numbers must start with a digit "
                           "and can only containg alphanumerics or characters "
                           "in %s" % list(version_whitelist_chars))

    @classmethod
    def is_valid_orig_archive(cls, filename):
        """
        Is this a valid orig source archive

        @param filename: upstream source archive filename
        @type filename: C{str}
        @return: true if valid upstream source archive filename
        @rtype: C{bool}

        >>> RpmPkgPolicy.is_valid_orig_archive("foo/bar_baz.tar.gz")
        True
        >>> RpmPkgPolicy.is_valid_orig_archive("foo.bar.tar")
        True
        >>> RpmPkgPolicy.is_valid_orig_archive("foo.bar")
        False
        >>> RpmPkgPolicy.is_valid_orig_archive("foo.gz")
        False
        """
        _base, arch_fmt, _compression = parse_archive_filename(filename)
        if arch_fmt:
            return True
        return False

