import sys

try:
    open('/usr/bin/reprepro')
except IOError:
    sys.stderr.write('Missing dependency: install reprepro and '
                     'try again\n')

CONF_DIR_PATH = '/etc/debderiver'

try:
    open('%s/debderiver.yaml' % CONF_DIR_PATH)
except IOError:
    sys.stderr.write('Copy "debderiver.yaml" to "%s" and edit it '
                     'to suit your needs\n' % CONF_DIR_PATH)