Lawrence Hudson, SF #401702: Modify co_filename in frozen programs

This patch was developed primarily to reduce the size of the
  frozen binary.  It is particularly useful when freezing for 'small'
  platforms, such as Palm OS, where you really want to save that
  last miserable byte.

  A limitation of this patch is that it does not provide any feedback
  about the replacements being made.  As the path matching
  is case-sensitive this may lead to unexpected behaviour for DOS
  and Windows people, eg
      > freeze.py -r C:\Python\Lib\=py\ goats.py
  should probably be:
      > freeze.py -r c:\python\lib\=py\ goats.py

Tools/freeze/freeze.py

@@ -57,6 +57,10 @@
               (For debugging only -- on a win32 platform, win32 behavior
               is automatic.)
 
+-r prefix=f:  Replace path prefix.
+              Replace prefix with f in the source path references 
+              contained in the resulting binary.
+
 Arguments:
 
 script:       The Python script to be executed by the resulting binary.
@@ -109,6 +113,7 @@ def main():
     debug = 1
     odir = ''
     win = sys.platform[:3] == 'win'
+    replace_paths = []                  # settable with -r option
 
     # default the exclude list for each platform
     if win: exclude = exclude + [
@@ -139,7 +144,7 @@ def main():
 
     # Now parse the command line with the extras inserted.
     try:
-        opts, args = getopt.getopt(sys.argv[1:], 'a:de:hmo:p:P:qs:wx:l:')
+        opts, args = getopt.getopt(sys.argv[1:], 'r:a:de:hmo:p:P:qs:wx:l:')
     except getopt.error, msg:
         usage('getopt error: ' + str(msg))
 
@@ -174,6 +179,9 @@ def main():
             addn_link.append(a)
         if o == '-a':
             apply(modulefinder.AddPackagePath, tuple(string.split(a,"=", 2)))
+        if o == '-r':
+            f,r = string.split(a,"=", 2)
+            replace_paths.append( (f,r) )
 
     # default prefix and exec_prefix
     if not exec_prefix:
@@ -310,7 +318,7 @@ def main():
     # collect all modules of the program
     dir = os.path.dirname(scriptfile)
     path[0] = dir
-    mf = modulefinder.ModuleFinder(path, debug, exclude)
+    mf = modulefinder.ModuleFinder(path, debug, exclude, replace_paths)
     
     if win and subsystem=='service':
         # If a Windows service, then add the "built-in" module.

Tools/freeze/modulefinder.py

@@ -7,6 +7,7 @@
 import re
 import string
 import sys
+import new
 
 IMPORT_NAME = dis.opname.index('IMPORT_NAME')
 IMPORT_FROM = dis.opname.index('IMPORT_FROM')
@@ -49,7 +50,7 @@ def __repr__(self):
 
 class ModuleFinder:
 
-    def __init__(self, path=None, debug=0, excludes = []):
+    def __init__(self, path=None, debug=0, excludes = [], replace_paths = []):
         if path is None:
             path = sys.path
         self.path = path
@@ -58,6 +59,8 @@ def __init__(self, path=None, debug=0, excludes = []):
         self.debug = debug
         self.indent = 0
         self.excludes = excludes
+        self.replace_paths = replace_paths
+        self.processed_paths = []   # Used in debugging only
 
     def msg(self, level, str, *args):
         if level <= self.debug:
@@ -250,6 +253,8 @@ def load_module(self, fqname, fp, pathname, (suffix, mode, type)):
         m = self.add_module(fqname)
         m.__file__ = pathname
         if co:
+            if self.replace_paths:
+                co = self.replace_paths_in_code(co)
             m.__code__ = co
             self.scan_code(co, m)
         self.msgout(2, "load_module ->", m)
@@ -369,6 +374,32 @@ def report(self):
                 mods.sort()
                 print "?", key, "from", string.join(mods, ', ')
 
+    def replace_paths_in_code(self, co):
+        new_filename = original_filename = os.path.normpath(co.co_filename)
+        for f,r in self.replace_paths:
+            if original_filename.startswith(f):
+                new_filename = r+original_filename[len(f):]
+                break
+
+        if self.debug and original_filename not in self.processed_paths:
+            if new_filename!=original_filename:
+                self.msgout(2, "co_filename %r changed to %r" \
+                                    % (original_filename,new_filename,))
+            else:
+                self.msgout(2, "co_filename %r remains unchanged" \
+                                    % (original_filename,))
+            self.processed_paths.append(original_filename)
+
+        consts = list(co.co_consts)
+        for i in range(len(consts)):
+            if isinstance(consts[i], type(co)):
+                consts[i] = self.replace_paths_in_code(consts[i])
+
+        return new.code(co.co_argcount, co.co_nlocals, co.co_stacksize, 
+                         co.co_flags, co.co_code, tuple(consts), co.co_names, 
+                         co.co_varnames, new_filename, co.co_name, 
+                         co.co_firstlineno, co.co_lnotab)
+
 
 def test():
     # Parse command line