bug#28094: cuirass doesn’t build i686 things

[Ricardo Wurmus]

Hi Guix,

it looks like Cuirass refuses to build i686 things because that would
violate a UNIQUE constraint:

--8<---------------cut here---------------start------------->8---
@ build-started /gnu/store/2qpglj9ylcb72c51m1qr8qfmdi20aa16-grub-2.02.drv - 
i686-linux 
/var/log/guix/drvs/2q//pglj9ylcb72c51m1qr8qfmdi20aa16-grub-2.02.drv.bz2
In ice-9/boot-9.scm:
   230:29 19 (map1 (((#:eval-id . 5) (#:duration . 102000.0) # # ?) ?))
   230:29 18 (map1 (((#:eval-id . 5) (#:duration . 69000.0) # # ?) ?))
   230:29 17 (map1 (((#:eval-id . 5) (#:duration . 86000.0) # # ?) ?))
   230:29 16 (map1 (((#:eval-id . 5) (#:duration . 81000.0) # # ?) ?))
   230:29 15 (map1 (((#:eval-id . 5) (#:duration . 82000.0) # # ?) ?))
   230:29 14 (map1 (((#:eval-id . 5) (#:duration . 68000.0) # # ?) ?))
   230:29 13 (map1 (((#:eval-id . 5) (#:duration . 74000.0) # # ?) ?))
   230:29 12 (map1 (((#:eval-id . 5) (#:duration . 77000.0) # # ?) ?))
   230:29 11 (map1 (((#:eval-id . 5) (#:duration . 98000.0) # # ?) ?))
   230:29 10 (map1 (((#:eval-id . 5) (#:duration . 103000.0) # # ?) ?))
   230:29  9 (map1 (((#:eval-id . 5) (#:duration . 75000.0) # # ?) ?))
   230:29  8 (map1 (((#:eval-id . 5) (#:duration . 74000.0) # # ?) ?))
   230:29  7 (map1 (((#:eval-id . 5) (#:duration . 75000.0) # # ?) ?))
   230:29  6 (map1 (((#:eval-id . 5) (#:duration . 64000.0) # # ?) ?))
   230:17  5 (map1 (((#:eval-id . 5) (#:duration . 147000.0) # # ?) ?))
In cuirass/base.scm:
    145:6  4 (register _)
In ice-9/boot-9.scm:
   268:13  3 (for-each #<procedure 4a51ae0 at cuirass/base.scm:145:?> ?)
In cuirass/database.scm:
    186:2  2 (db-add-build #<<sqlite-db> pointer: #<pointer 0x23455?> ?)
    54:28  1 (sqlite-exec _ _ . _)
In ice-9/eval.scm:
    619:8  0 (_ #(#(#(#(#<directory (sqlite3) 23c0a00> #<?>) #) #) #))
ice-9/eval.scm:619:8: ice-9/eval.scm:619:8: Throw to key `sqlite-error' with 
args `(#f 1555 "UNIQUE const
raint failed: Builds.derivation, Builds.evaluation, Builds.output")'.
--8<---------------cut here---------------end--------------->8---

https://berlin.guixsd.org is configured to provide substitutes for
x86_64 and i686 yet it has barely built any i686 packages so far.

--
Ricardo

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