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# Copyright (C) 2015 Codethink Limited
#
# 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; version 2 of the License.
#
# 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, see <http://www.gnu.org/licenses/>.
import logging
import os
import shutil
import subprocess
import sys
import sandboxlib
def check_parameter(name, value, supported_values):
assert value in supported_values, \
"'%(value)s' is an unsupported value for '%(name)s' in this " \
"backend. Supported values: %(supported_values)s".format(
name=name, value=value,
supported_values=', '.join(supported_values))
def find_program(program_name):
search_path = os.environ.get('PATH')
# Python 3.3 and newer provide a 'find program in PATH' function. Otherwise
# we fall back to the `which` program.
if sys.version_info.major >= 3 and sys.version_info.minor >= 3:
program_path = shutil.which(program_name, path=search_path)
else:
try:
argv = ['which', program_name]
program_path = subprocess.check_output(argv).strip()
except subprocess.CalledProcessError as e:
logging.debug("Error searching for %s: %s", program_name, e)
program_path = None
if program_path is None:
raise sandboxlib.ProgramNotFound(
"Did not find '%s' in PATH. Searched '%s'" % (
program_name, search_path))
return program_path
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