Re: Inherit, rewrite: different binaries?

[Tobias Geerinckx-Rice <me@tobias.gr>]

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Zimoun,

zimoun 写道：
> Somehow, the 3 packages ’hello’, ’hello-bis’ and ’hello-ter’ are 
> the
> same.
>
> Using Guix 04a459a069155a6b676b6b93d7dbddb426dd0679, the 
> binaries do not
> seem the same:
>
> --8<---------------cut 
> here---------------start------------->8---
> $ for h in hello hello-bis hello-ter; do md5sum $(guix build -L 
> . $h)/bin/hello; done
> 4183f77722b91fb156403838f299cc7f 
> /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/bin/hello
> 4c6b9c3b6eca974c1433ec489a7abe92 
> /gnu/store/zpmd9s4yggrksr2rki8xkxvzp44q8zmk-hello-bis-2.10/bin/hello
> 0c34626a575622351678d8554b7b5310 
> /gnu/store/dg0lxrxc5wz3k3ljc82n5pn3y9ffg8s4-hello-ter-2.10/bin/hello
> --8<---------------cut 
> here---------------end--------------->8---

This is expected: each hello binary contains its own store 
directory:

  $ grep /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10 \
    /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/bin/hello
  Binary file [...]/bin/hello matches.

In the above case you're changing the package name and hence the 
hash, and both of those things change the store directory 
(obviously, or you wouldn't have three things to compare).  The 
string embedded inside each hello binary will also differ.  In 
this case, it's the 
/gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/share/locale 
used to look up translations, but packages are free to refer to 
themselves as much as they like.  Without inside information, one 
can never assume two different outputs are identical.

Kind regards,

T G-R

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