You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
78 lines
3.0 KiB
Python
78 lines
3.0 KiB
Python
# Copyright 2019, David Wilson
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are met:
|
|
#
|
|
# 1. Redistributions of source code must retain the above copyright notice,
|
|
# this list of conditions and the following disclaimer.
|
|
#
|
|
# 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
# this list of conditions and the following disclaimer in the documentation
|
|
# and/or other materials provided with the distribution.
|
|
#
|
|
# 3. Neither the name of the copyright holder nor the names of its contributors
|
|
# may be used to endorse or promote products derived from this software without
|
|
# specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
# POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
from __future__ import absolute_import, division, print_function
|
|
from __future__ import unicode_literals
|
|
__metaclass__ = type
|
|
|
|
import mitogen.core
|
|
|
|
|
|
def parse_script_interpreter(source):
|
|
"""
|
|
Parse the script interpreter portion of a UNIX hashbang using the rules
|
|
Linux uses.
|
|
|
|
:param str source: String like "/usr/bin/env python".
|
|
|
|
:returns:
|
|
Tuple of `(interpreter, arg)`, where `intepreter` is the script
|
|
interpreter and `arg` is its sole argument if present, otherwise
|
|
:py:data:`None`.
|
|
"""
|
|
# Find terminating newline. Assume last byte of binprm_buf if absent.
|
|
nl = source.find(b'\n', 0, 128)
|
|
if nl == -1:
|
|
nl = min(128, len(source))
|
|
|
|
# Split once on the first run of whitespace. If no whitespace exists,
|
|
# bits just contains the interpreter filename.
|
|
bits = source[0:nl].strip().split(None, 1)
|
|
if len(bits) == 1:
|
|
return mitogen.core.to_text(bits[0]), None
|
|
return mitogen.core.to_text(bits[0]), mitogen.core.to_text(bits[1])
|
|
|
|
|
|
def parse_hashbang(source):
|
|
"""
|
|
Parse a UNIX "hashbang line" using the syntax supported by Linux.
|
|
|
|
:param str source: String like "#!/usr/bin/env python".
|
|
|
|
:returns:
|
|
Tuple of `(interpreter, arg)`, where `intepreter` is the script
|
|
interpreter and `arg` is its sole argument if present, otherwise
|
|
:py:data:`None`.
|
|
"""
|
|
# Linux requires first 2 bytes with no whitespace, pretty sure it's the
|
|
# same everywhere. See binfmt_script.c.
|
|
if not source.startswith(b'#!'):
|
|
return None, None
|
|
|
|
return parse_script_interpreter(source[2:])
|