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import Options
from optparse import SUPPRESS_HELP

def set_options(opt):
    # allow users to disable gnutls
    opt.add_option('--enable-gnutls',
                   help=("Enable use of gnutls"),
                   action="store_true", dest='enable_gnutls', default=True)
    opt.add_option('--disable-gnutls', help=SUPPRESS_HELP, action="store_false", dest='enable_gnutls')


def configure(conf):
    conf.env.enable_gnutls = Options.options.enable_gnutls
    if not conf.env.enable_gnutls:
        return

    conf.check_cfg(package='gnutls',
                   args='"gnutls >= 1.4.0" --cflags --libs',
                   msg='Checking for gnutls >= 1.4.0', mandatory=False)

    if 'HAVE_GNUTLS' in conf.env and not Options.options.disable_gnutls:
        conf.DEFINE('ENABLE_GNUTLS', 1)

    conf.CHECK_FUNCS_IN('gnutls_global_init', 'gnutls',
                        headers='gnutls/gnutls.h')

    conf.CHECK_VARIABLE('gnutls_x509_crt_set_version',
                        headers='gnutls/gnutls.h gnutls/x509.h',
                        define='HAVE_GNUTLS_X509_CRT_SET_VERSION',
                        lib='gnutls')
    conf.CHECK_VARIABLE('gnutls_x509_crt_set_subject_key_id',
                        headers='gnutls/gnutls.h gnutls/x509.h',
                        define='HAVE_GNUTLS_X509_CRT_SET_SUBJECT_KEY_ID',
                        lib='gnutls')

    # check for gnutls_datum types
    conf.CHECK_TYPES('gnutls_datum gnutls_datum_t',
                     headers='gnutls/gnutls.h', lib='gnutls')

    conf.CHECK_FUNCS_IN('gcry_control', 'gcrypt', headers='gcrypt.h')
    conf.CHECK_FUNCS_IN('gpg_err_code_from_errno', 'gpg-error')


def build(bld):
    bld.SAMBA_SUBSYSTEM('LIBTLS',
                        source='tls.c tlscert.c',
                        public_deps='talloc gnutls gcrypt LIBSAMBA-HOSTCONFIG samba_socket',
                        enabled = bld.env.enable_gnutls
                        )