shows unsatisfied dependencies for a set of ipkg files

ipkg_deps.py

#!/usr/bin/python
#
# show unsatisfied depedencies for a set of ipkg files
# useful when creating a self-sufficient set of packages offline
#
# 2016.07.05 darell tan
#

import tarfile
import sys
import os

def get_control_dict(ipkg):
	pkgf = tarfile.open(ipkg, 'r')
	cf = tarfile.open(fileobj=pkgf.extractfile('./control.tar.gz'), mode='r')
	control = cf.extractfile('./control').readlines()
	cf.close()
	pkgf.close()

	# parse control data
	control_dict = {}
	for l in control:
		kv = l.strip().split(':', 1)
		k = kv[0].strip()
		control_dict[k] = kv[1].strip() if len(kv) > 1 else None

	return control_dict

def main():
	# collect deps
	dep_map = {}
	pkgdir = sys.argv[1]
	filelist = [pkgdir] if os.path.isfile(pkgdir) else \
			[os.path.join(pkgdir, f) for f in os.listdir(pkgdir)]
	for f in filelist:
		if not f.endswith('.ipk'):
			continue
		print 'processing ' + f
		c = get_control_dict(f)
		deps = c.get('Depends', None)
		dep_map[c['Package']] = [] if not deps else \
			[d.strip() for d in deps.split(',')]

	# parse deps
	allpkgs = set(dep_map.keys())
	for pkg in dep_map:
		pkg_deps = dep_map[pkg]
		print pkg, pkg_deps
		missing_deps = set(pkg_deps) - allpkgs
		dep_map[pkg] = missing_deps

	print ''

	allmissing = set()
	for pkg in dep_map:
		allmissing |= dep_map[pkg]
	print 'unsatisfied deps:'
	print allmissing

if __name__ == '__main__':
	main()