#!/usr/bin/python

import sys
import datetime
sys.path.append("/usr/lib/portage/pym")
import portage_checksum
import portage_const

usage=	"usage: %s [-p] \n" % sys.argv[0] + \
		"read file paths from stdin and perform_md5() on each file\n"+ \
		"options:\n" +\
		"   -p      use calc_prelink=1 (disabled by default)\n"

if __name__=="__main__":
	if len(sys.argv)>2 or (len(sys.argv)==2 and sys.argv[1]!="-p"):
		sys.stderr.write(usage)
		sys.stderr.flush()
		sys.exit(1)
	
	calc_prelink=0
	if len(sys.argv)==2 and sys.argv[1]=="-p":
		if not portage_checksum.prelink_capable:
			sys.stderr.write("Could not find prelink binary:"+portage_const.PRELINK_BINARY+"\n")
			sys.exit(1)
		calc_prelink=1
	
	for line in sys.stdin:
		path=line.rstrip("\n")
		portage_checksum.perform_checksum(path,calc_prelink=calc_prelink)