Cuirass and duplicate derivations

[ludo@gnu.org (Ludovic Courtès)]

Hello!

Cuirass is almost up and running on the new machine!  :-)

The last problem I experienced is this:

--8<---------------cut here---------------start------------->8---
evaluate 'gfortran-4.9.4.x86_64-linux': 0.136 seconds
evaluate 'gfortran-4.9.4.x86_64-linux': 0.000 seconds
Backtrace:
In ice-9/boot-9.scm:
 160: 12 [catch #t #<catch-closure 1b9bc40> ...]
In unknown file:
   ?: 11 [apply-smob/1 #<catch-closure 1b9bc40>]
In ice-9/boot-9.scm:
  66: 10 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 9 [eval # #]
In ice-9/r4rs.scm:
  90: 8 [dynamic-wind #<procedure a26a600 at ice-9/boot-9.scm:1136:2 _> ...]
In ice-9/eval.scm:
 481: 7 [lp (#<fluid 22> #<fluid 34>) ("/var/run/cuirass/cuirass.db" #f)]
 481: 6 [lp (#<fluid 34>) (#f)]
 432: 5 [eval # #]
 387: 4 [eval # #]
In ice-9/boot-9.scm:
 705: 3 [map #<procedure c3bbdb0 at ice-9/eval.scm:416:20 (a)> #]
In ice-9/eval.scm:
 432: 2 [eval # #]
In src/cuirass/database.scm:
  54: 1 [sqlite-exec # ...]
In ice-9/eval.scm:
 432: 0 [eval # #]

ice-9/eval.scm:432:17: In procedure eval:
ice-9/eval.scm:432:17: Throw to key `sqlite-error' with args `(#f 1555 "UNIQUE constraint failed: Derivations.derivation, Derivations.evaluation")'.
--8<---------------cut here---------------end--------------->8---

… which commit 7355634db3ccf0d86f8e34c4aea37392c1a0ab0a fixes.

Then there was another one:

--8<---------------cut here---------------start------------->8---
evaluate 'wine-1.9.24.i686-linux': 0.205 seconds
Backtrace:
In ice-9/boot-9.scm:
 160: 12 [catch #t #<catch-closure 9efb20> ...]
In unknown file:
   ?: 11 [apply-smob/1 #<catch-closure 9efb20>]
In ice-9/boot-9.scm:
  66: 10 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 9 [eval # #]
In ice-9/r4rs.scm:
  90: 8 [dynamic-wind #<procedure 9104c20 at ice-9/boot-9.scm:1136:2 _> ...]
In ice-9/eval.scm:
 481: 7 [lp (#<fluid 22> #<fluid 34>) ("/var/run/cuirass/cuirass.db" #f)]
 481: 6 [lp (#<fluid 34>) (#f)]
 432: 5 [eval # #]
 387: 4 [eval # #]
In ice-9/boot-9.scm:
 703: 3 [map #<procedure b0913f0 at ice-9/eval.scm:416:20 (a)> #]
In ice-9/eval.scm:
 432: 2 [eval # #]
In src/cuirass/database.scm:
  54: 1 [sqlite-exec # ...]
In ice-9/eval.scm:
 432: 0 [eval # #]

ice-9/eval.scm:432:17: In procedure eval:
ice-9/eval.scm:432:17: Throw to key `sqlite-error' with args `(#f 1555 "UNIQUE constraint failed: Derivations.derivation, Derivations.evaluation")'.
--8<---------------cut here---------------end--------------->8---

This is because Wine is always built for i686-linux, even on x86_64,
hence the same .drv.  So I hacked my way to ignore Wine.

But then ‘cargo-bootstrap’ showed the same problem.

Hence this message.  :-)

What change would you suggest to solve this problem?  It would be best
if Cuirass allowed several jobs building the same derivations (the key
could be an autoincrement counter instead of the (drv,eval) pair maybe?)

TIA!

Ludo’.