I took a look at macholib just now, and it seems like it would be able to 
get us most of the way there, at least as far keeping the headers updated.

Here's a post on StackOverflow that describes embedding arbitrary data at 
link time:

http://stackoverflow.com/questions/1604673/how-do-i-embed-data-into-a-mac-os-x-mach-o-binary-files-text-section?rq=1

Obviously, we don't want to force the user to rebuild the bootloader, but 
experimentation with the -sectcreate flag on ld should provide some 
illumination about how the data is supposed to be embedded in the 
executable.

Jeff

On Tuesday, December 11, 2012 11:37:08 AM UTC-7, Martin Z wrote:

> Jeff Keacher píše v Út 11. 12. 2012 v 09:55 -0800: 
> > Now, pyinstaller does include the ability to look backwards from the 
> > end of the executable a little ways in an effort to find the magic 
> > number (a feature that was apparently added to support digital 
> > signatures on Windows), so a relatively small change might add support 
> > for sticking the archive further back in the executable. 
>
> I'm going to work more on the bootloader code so this could be done as 
> part of that. 
>
> > One possibility would be sticking the archive in a TEXT segment of the 
> > executable (caveat: I haven't investigated that thoroughly), but then 
> > the pyinstaller build script would need to be able to intelligently 
> > reconstruct the executable with a valid MachO structure, all without 
> > disrupting the pointers in the "load commands" section of the file. 
>
> Do you think that library macholib would be able to do this 'intelligent 
> reconstructions'? 
>
> We already use that library for some manipulation with MachO headers. 
>
>
>

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