| # Copyright 2010 Gentoo Foundation |
| # Distributed under the terms of the GNU General Public License v2 |
| |
| from portage import os |
| from portage.process import find_binary |
| from portage.util import shlex_split |
| |
| def validate_cmd_var(v): |
| """ |
| Validate an evironment variable value to see if it |
| contains an executable command as the first token. |
| returns (valid, token_list) where 'valid' is boolean and 'token_list' |
| is the (possibly empty) list of tokens split by shlex. |
| """ |
| invalid = False |
| v_split = shlex_split(v) |
| if not v_split: |
| invalid = True |
| elif os.path.isabs(v_split[0]): |
| invalid = not os.access(v_split[0], os.EX_OK) |
| elif find_binary(v_split[0]) is None: |
| invalid = True |
| return (not invalid, v_split) |
