Obscure gentoo utility script to merge files of profiles into one each. Useful if trying to combine different gentoo profiles.

reduce_profiles.py

#!/usr/bin/env python
# Reduces gentoos portage configuration, found in profiles, files into single respective config files.

import sys
import argparse
import subprocess
import re
import os.path

base_path = "/usr/portage/profiles/"
get_profiles_cmd = "eselect profile list"

profile_files = ["packages.build","package.use","package.use.mask","packages","make.defaults","package.use.mask","use.mask","package.use.force","use.force","profile.bashrc", "package.provided", "package.unmask", "use.stable.mask"]

parent = "parent"

def collect_profile_file(path, file, content=""):
	"""Merges the profile hierachy at 'path' for the specified file 'file'."""
	realpath = os.path.realpath(path)+'/'
	profile_file = realpath + file
#	print "Collecting "+profile_file+':'
	if os.path.isfile(profile_file):
#		print "Found a profile file!"
		content += open(profile_file,'r').read()
	parent_file = path + parent
	if os.path.isfile(parent_file):
		parent_symlink = open(parent_file,'r')
		for link in parent_symlink:
			if "base" not in link:
#				print "Found parent file, following it to " + link
				content += collect_profile_file(realpath+link.strip()+'/', file, content)
	return content


parser = argparse.ArgumentParser(description='Specify the profile IDs you wish to merge.')
parser.add_argument('integers', metavar='N', type=int, nargs='+', help='profile ID')

args = parser.parse_args()

get_profiles_process = subprocess.Popen(get_profiles_cmd, shell=True, stdout=subprocess.PIPE)
(selectable_profiles, error) = get_profiles_process.communicate()

profiles_marked_for_merge = args.integers

if error:
	print "Unable to execute " + get_profiles_command + "."
	sys.exit(1)

available_profiles =  map(lambda x: int(x),re.findall('\[(\d+)\]',selectable_profiles))

# only proceed if the selected profiles actually exist
if not set( profiles_marked_for_merge).issubset( available_profiles):
	print "You have selected profiles " + str(profiles_marked_for_merge) +". At least one of those could not be found using '"+ get_profiles_cmd +"'."
	sys.exit(1)

lines = set()
for profile_id in profiles_marked_for_merge:
	pattern = '\s*\['+str(profile_id)+'\]\s*(.*)'
	matched_path = re.search('\s*\['+str(profile_id)+'\]\s*(.*)',selectable_profiles)
	if matched_path:
		profile_path = base_path + matched_path.group(1).strip()+'/'
		for file in profile_files:
			profile_file_collected = collect_profile_file(profile_path, file)
			if profile_file_collected:
				with open(file,'a') as output_file:
					for line in profile_file_collected.splitlines():
						if line not in lines:
							lines.add(line)
							output_file.write("\n" + line)
				output_file.closed