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#
# namcap rules - utility functions
# Copyright (C) 2009 Dan McGee <dan@archlinux.org>
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import os
import re
import stat
def _read_carefully(path, readcall):
if not os.path.isfile(path):
return False
reset_perms = False
if not os.access(path, os.R_OK):
# don't mess with links we can't read
if os.path.islink(path):
return None
reset_perms = True
# attempt to make it readable if possible
statinfo = os.stat(path)
newmode = statinfo.st_mode | stat.S_IRUSR
try:
os.chmod(path, newmode)
except IOError:
return None
fd = open(path, 'rb')
val = readcall(fd)
fd.close()
# reset permissions if necessary
if reset_perms:
# set file back to original permissions
os.chmod(path, statinfo.st_mode)
return val
def is_elf(path):
"""
Given a file path, ensure it exists and peek at the first few bytes
to determine if it is an ELF file.
"""
magic = _read_carefully(path, lambda fd: fd.read(4))
if not magic:
return False
# magic elf header, present in binaries and libraries
if magic == b"\x7FELF":
return True
else:
return False
def script_type(path):
firstline = _read_carefully(path, lambda fd: fd.readline())
firstline = firstline.decode('ascii', 'ignore')
if not firstline:
return None
script = re.compile('#!.*/(.*)')
m = script.match(firstline)
if m != None:
cmd = m.group(1).split()
name = cmd[0]
if name == 'env':
name = cmd[1]
return name
return None
clean_filename = lambda s: re.search(r"/tmp/namcap\.[0-9]*/(.*)", s).group(1)
# vim: set ts=4 sw=4 noet:
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