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##############################################################################
# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/llnl/spack
# Please also see the LICENSE file for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# 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 terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
import os
from llnl.util.filesystem import *
import llnl.util.tty as tty
import spack
import spack.modules
# Character limit for shebang line. Using Linux's 127 characters
# here, as it is the shortest I could find on a modern OS.
shebang_limit = 127
def shebang_too_long(path):
"""Detects whether a file has a shebang line that is too long."""
with open(path, 'r') as script:
bytes = script.read(2)
if bytes != '#!':
return False
line = bytes + script.readline()
return len(line) > shebang_limit
def filter_shebang(path):
"""Adds a second shebang line, using sbang, at the beginning of a file."""
with open(path, 'r') as original_file:
original = original_file.read()
# This line will be prepended to file
new_sbang_line = '#!/bin/bash %s/bin/sbang\n' % spack.spack_root
# Skip files that are already using sbang.
if original.startswith(new_sbang_line):
return
with open(path, 'w') as new_file:
new_file.write(new_sbang_line)
new_file.write(original)
tty.warn("Patched overly long shebang in %s" % path)
def filter_shebangs_in_directory(directory):
for file in os.listdir(directory):
path = os.path.join(directory, file)
# only handle files
if not os.path.isfile(path):
continue
# only handle links that resolve within THIS package's prefix.
if os.path.islink(path):
real_path = os.path.realpath(path)
if not real_path.startswith(directory + os.sep):
continue
# test the file for a long shebang, and filter
if shebang_too_long(path):
filter_shebang(path)
def post_install(pkg):
"""This hook edits scripts so that they call /bin/bash
$spack_prefix/bin/sbang instead of something longer than the
shebang limit."""
if not os.path.isdir(pkg.prefix.bin):
return
filter_shebangs_in_directory(pkg.prefix.bin)
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