bug#32347: gzip cannot be patched

[Maxim Cournoyer]

Hi Efraim,

Efraim Flashner <efraim@flashner.co.il> writes:

> On Sun, Aug 19, 2018 at 03:48:05PM +0200, Ludovic Courtès wrote:
>> Hello,
>> 
>> Efraim Flashner <efraim@flashner.co.il> skribis:
>> 
>> > On Thu, Aug 02, 2018 at 01:32:02PM +0200, Marius Bakke wrote:
>> >> Hello!
>> >> 
>> >> I'm trying to add a patch to 'gzip', but it causes an infinite loop and
>> >> eventually the system runs out of memory.
>> >> 
>> >> It can be reproduced by adding this hunk:
>> >> 
>> >
>> >> modified   gnu/packages/compression.scm
>> >> @@ -215,6 +215,7 @@ adding and extracting files to/from a tar archive.")
>> >>              (method url-fetch)
>> >>              (uri (string-append "mirror://gnu/gzip/gzip-"
>> >>                                  version ".tar.xz"))
>> >> +            (snippet '(#t))
>> >>              (sha256
>> >>               (base32
>> >>                "16h8g4acy7fgfxcjacr3wijjsnixwsfd2jhz3zwdi2qrzi262l5f"))))
>> >> 
>> >> [back]
>> >> 
>> >> I guess this is because gzip itself is a patch input.  Is this something
>> >> that can be fixed, or do we have to use "patching phases" in these cases?
>> >
>> > Its also in commencement.scm, so that might be the loop instead. You
>> > could try "unpatching" it there. It looks like it has a pseudo-package
>> > inside of glibc-utf8-locales-final, with grep-final a few packages lower
>> > being potential inspiration for undoing the modifications in "real
>> > gzip".
>> 
>> Indeed.  The ‘bootstrap-origin’ procedure, defined in (gnu packages
>> bootstrap), arranges to use the bootstrap binaries of gzip, patch,
>> guile, etc. when patching origins.
>> 
>> Perhaps we’re missing a use of ‘bootstrap-origin’ somewhere in (gnu
>> packages commencement)?
>> 
>
> Looks like it in the end. the gzip for glibc-utf8-locales-final uses the
> bootstrap guile for its building, but doesn't get the input rewriting
> that comes from package-with-bootstrap-guile. With this patch adding the
> trivial snippet to gzip doesn't cause an infinite loop anymore. Since
> the patch doesn't change the hash of glibc-utf8-locales-final it should
> be OK for master.

If you have verified the patch doesn't cause a world rebuild (guix build
libreoffice), feel free t opush and close this old bug!

-- 
Thanks,
Maxim