# Goals stdlib url module.
# Copyright (C) 2019 Richard W.M. Jones
# Copyright (C) 2019 Red Hat Inc.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# Predicates for dealing with URLs.  These require the curl command
# line tool.

# XXX predicate is-url

# Check only if a URL exists without considering its age.
predicate is-url-exists (url) = {
    curl --output /dev/null --silent --head --fail %url || exit 99
}