bin/os_dep.py

#!/usr/bin/python
import os

"""
One day, when this module grows up, it might actually try to fix things.
'apt-cache search | apt-get install' ... or a less terrifying version of
the same. With added distro-independant pixie dust.
"""

def command(cmd):
	# this could use '/usr/bin/which', I suppose. But this seems simpler
	for dir in os.environ['PATH'].split(':'):
		file = os.path.join(dir, cmd)
		if os.path.exists(file):
			return file
	raise 'Missing command: %s' % cmd


def commands(*cmds):
	results = []
	for cmd in cmds:
		results.append(command(cmd))


def library(lib):
	lddirs = [x.rstrip() for x in open('/etc/ld.so.conf', 'r').readlines()]
	for dir in ['/lib', '/usr/lib'] + lddirs:
		file = os.path.join(dir, lib)
		if os.path.exists(file):
			return file
	raise 'Missing library: %s' % lib


def libraries(*libs):
	results = []
	for lib in libs:
		results.append(library(lib))