bug#58567: Some grafts use a different input derivation than computed by --no-grafts

[Marius Bakke]

Marius Bakke <marius@gnu.org> skriver:

> Should not the mesa used by icecat be the same as `guix build mesa`,
> just like in the ungrafted case?  Their outputs differ, too:
>
>   $ guix hash -r $(guix build mesa | tail -n1)
>   1invy9jcd1fnfx7d4asfyjqs1jn7lngjfqswak6sy9ffjbhhsg6x
>   $ guix hash -r $(guix size icecat | grep mesa | awk '{ print $1 }')
>   195zk0c0h5m016hp0c1haqws47rwfj7sbpqpddmwk2iw402p3apv

Errh, the difference in output is not surprising since mesa obviously
contains references to itself.  Different derivation, different store
file name.

> Diffoscope says it will take 123 days to process these, so don't hold
> your breath!

It did not take 123 days, but I had diffed the wrong mesa.  Will update
if the difference is anything other than the mesa store file name...

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