Tools/freeze/freeze.py

#! /usr/bin/env python

"""Freeze a Python script into a binary.

usage: freeze [options...] script.py [module]...

Options:

-p prefix:    This is the prefix used when you ran ``make install''
              in the Python build directory.
              (If you never ran this, freeze won't work.)
              The default is whatever sys.prefix evaluates to.
	      It can also be the top directory of the Python source
	      tree; then -P must point to the build tree.

-P exec_prefix: Like -p but this is the 'exec_prefix', used to
		install objects etc.  The default is whatever sys.exec_prefix
		evaluates to, or the -p argument if given.
		If -p points to the Python source tree, -P must point
		to the build tree, if different.

-e extension: A directory containing additional .o files that
              may be used to resolve modules.  This directory
              should also have a Setup file describing the .o files.
              More than one -e option may be given.

-o dir:       Directory where the output files are created; default '.'.

-h:           Print this help message.

Arguments:

script.py:    The Python script to be executed by the resulting binary.
	      It *must* end with a .py suffix!

module ...:   Additional Python modules (referenced by pathname)
              that will be included in the resulting binary.  These
              may be .py or .pyc files.

NOTES:

In order to use freeze successfully, you must have built Python and
installed it ("make install").

The script should not use modules provided only as shared libraries;
if it does, the resulting binary is not self-contained.
"""


# Import standard modules

import cmp
import getopt
import os
import string
import sys
import addpack


# Import the freeze-private modules

import checkextensions
import findmodules
import makeconfig
import makefreeze
import makemakefile
import parsesetup


# Main program

def main():
	# overridable context
	prefix = None			# settable with -p option
	exec_prefix = None		# settable with -P option
	extensions = []
	path = sys.path
	odir = ''

	# output files
	frozen_c = 'frozen.c'
	config_c = 'config.c'
	target = 'a.out'		# normally derived from script name
	makefile = 'Makefile'

	# parse command line
	try:
		opts, args = getopt.getopt(sys.argv[1:], 'he:o:p:P:')
	except getopt.error, msg:
		usage('getopt error: ' + str(msg))

	# proces option arguments
	for o, a in opts:
		if o == '-h':
			print __doc__
			return
		if o == '-e':
			extensions.append(a)
		if o == '-o':
			odir = a
		if o == '-p':
			prefix = a
		if o == '-P':
			exec_prefix = a
	
	# default prefix and exec_prefix
	if not exec_prefix:
		if prefix:
			exec_prefix = prefix
		else:
			exec_prefix = sys.exec_prefix
	if not prefix:
		prefix = sys.prefix

	# determine whether -p points to the Python source tree
	ishome = os.path.exists(os.path.join(prefix, 'Include', 'pythonrun.h'))

	# locations derived from options
	version = sys.version[:3]
	if ishome:
	    print "(Using Python source directory)"
	    binlib = exec_prefix
	    incldir = os.path.join(prefix, 'Include')
	    config_c_in = os.path.join(prefix, 'Modules', 'config.c.in')
	    frozenmain_c = os.path.join(prefix, 'Modules', 'frozenmain.c')
	    makefile_in = os.path.join(exec_prefix, 'Modules', 'Makefile')
	else:
	    binlib = os.path.join(exec_prefix,
				  'lib', 'python%s' % version, 'config')
	    incldir = os.path.join(prefix, 'include', 'python%s' % version)
	    config_c_in = os.path.join(binlib, 'config.c.in')
	    frozenmain_c = os.path.join(binlib, 'frozenmain.c')
	    makefile_in = os.path.join(binlib, 'Makefile')
	supp_sources = []
	defines = []
	includes = ['-I' + incldir, '-I' + binlib]

	# sanity check of directories and files
	for dir in [prefix, exec_prefix, binlib, incldir] + extensions:
		if not os.path.exists(dir):
			usage('needed directory %s not found' % dir)
		if not os.path.isdir(dir):
			usage('%s: not a directory' % dir)
	for file in [config_c_in, makefile_in] + supp_sources:
		if not os.path.exists(file):
			usage('needed file %s not found' % file)
		if not os.path.isfile(file):
			usage('%s: not a plain file' % file)
	for dir in extensions:
		setup = os.path.join(dir, 'Setup')
		if not os.path.exists(setup):
			usage('needed file %s not found' % setup)
		if not os.path.isfile(setup):
			usage('%s: not a plain file' % setup)

	# check that enough arguments are passed
	if not args:
		usage('at least one filename argument required')

	# check that the script name ends in ".py"
	if args[0][-3:] != ".py":
		usage('the script name must have a .py suffix')

	# check that file arguments exist
	for arg in args:
		if not os.path.exists(arg):
			usage('argument %s not found' % arg)
		if not os.path.isfile(arg):
			usage('%s: not a plain file' % arg)

	# process non-option arguments
	scriptfile = args[0]
	modules = args[1:]

	# derive target name from script name
	base = os.path.basename(scriptfile)
	base, ext = os.path.splitext(base)
	if base:
		if base != scriptfile:
			target = base
		else:
			target = base + '.bin'
	
	# handle -o option
	base_frozen_c = frozen_c
	base_config_c = config_c
	base_target = target
	if odir and not os.path.isdir(odir):
		try:
			os.mkdir(odir)
			print "Created output directory", odir
		except os.error, msg:
			usage('%s: mkdir failed (%s)' % (odir, str(msg)))
	if odir:
		frozen_c = os.path.join(odir, frozen_c)
		config_c = os.path.join(odir, config_c)
		target = os.path.join(odir, target)
		makefile = os.path.join(odir,makefile)

	# Actual work starts here...

	dict = findmodules.findmodules(scriptfile, modules, path)
	names = dict.keys()
	names.sort()
	print "Modules being frozen:"
	for name in names:
	    print '\t', name

	backup = frozen_c + '~'
	try:
		os.rename(frozen_c, backup)
	except os.error:
		backup = None
	outfp = open(frozen_c, 'w')
	try:
		makefreeze.makefreeze(outfp, dict)
	finally:
		outfp.close()
	if backup:
		if cmp.cmp(backup, frozen_c):
			sys.stderr.write('%s not changed, not written\n' %
					 frozen_c)
			os.rename(backup, frozen_c)

	builtins = []
	unknown = []
	mods = dict.keys()
	mods.sort()
	for mod in mods:
		if dict[mod] == '<builtin>':
			builtins.append(mod)
		elif dict[mod] == '<unknown>':
			unknown.append(mod)

	addfiles = []
	if unknown:
		addfiles, addmods = \
			  checkextensions.checkextensions(unknown, extensions)
		for mod in addmods:
			unknown.remove(mod)
		builtins = builtins + addmods
	if unknown:
		sys.stderr.write('Warning: unknown modules remain: %s\n' %
				 string.join(unknown))

	builtins.sort()
	infp = open(config_c_in)
	backup = config_c + '~'
	try:
		os.rename(config_c, backup)
	except os.error:
		backup = None
	outfp = open(config_c, 'w')
	try:
		makeconfig.makeconfig(infp, outfp, builtins)
	finally:
		outfp.close()
	infp.close()
	if backup:
		if cmp.cmp(backup, config_c):
			sys.stderr.write('%s not changed, not written\n' %
					 config_c)
			os.rename(backup, config_c)

	cflags = defines + includes + ['$(OPT)']
	libs = [os.path.join(binlib, 'libpython$(VERSION).a')]

	makevars = parsesetup.getmakevars(makefile_in)
	somevars = {}
	for key in makevars.keys():
		somevars[key] = makevars[key]

	somevars['CFLAGS'] = string.join(cflags) # override
	files = ['$(OPT)', '$(LDFLAGS)', base_config_c, base_frozen_c] + \
		supp_sources +  addfiles + libs + \
		['$(MODLIBS)', '$(LIBS)', '$(SYSLIBS)']

	backup = makefile + '~'
	try:
		os.rename(makefile, backup)
	except os.error:
		backup = None
	outfp = open(makefile, 'w')
	try:
		makemakefile.makemakefile(outfp, somevars, files, base_target)
	finally:
		outfp.close()
	if backup:
		if not cmp.cmp(backup, makefile):
			print 'previous Makefile saved as', backup
		else:
			sys.stderr.write('%s not changed, not written\n' %
					 makefile)
			os.rename(backup, makefile)

	# Done!

	if odir:
		print 'Now run "make" in', odir,
		print 'to build the target:', base_target
	else:
		print 'Now run "make" to build the target:', base_target


# Print usage message and exit

def usage(msg):
	sys.stdout = sys.stderr
	print "Error:", msg
	print "Use ``%s -h'' for help" % sys.argv[0]
	sys.exit(2)


main()