* bug#30155: 'bag-transitive-inputs' behaves non-deterministically
@ 2018-01-18 11:20 Ludovic Courtès
2018-01-18 17:09 ` Ludovic Courtès
0 siblings, 1 reply; 2+ messages in thread
From: Ludovic Courtès @ 2018-01-18 11:20 UTC (permalink / raw)
To: 30155
On ‘core-updates’ (e80514bc03b003a7ce95d7b55cf33c9f18f9e860) I get:
--8<---------------cut here---------------start------------->8---
ludo@ribbon ~/src/guix/+core-updates$ make -q
make all-recursive
make[1]: Entering directory '/home/ludo/src/guix/+core-updates'
Making all in po/guix
make[1]: Leaving directory '/home/ludo/src/guix/+core-updates'
ludo@ribbon ~/src/guix/+core-updates$ ./pre-inst-env guix build -e '(@@ (gnu packages commencement) static-bash-for-glibc)' -d
/gnu/store/xymnr48xhdzvrw0cakhyn7hgapr4wiix-bash-static-4.4.12.drv
ludo@ribbon ~/src/guix/+core-updates$ rm gnu/packages/commencement.go
ludo@ribbon ~/src/guix/+core-updates$ ./pre-inst-env guix build -e '(@@ (gnu packages commencement) static-bash-for-glibc)' -d
;;; note: source file /home/ludo/src/guix/+core-updates/gnu/packages/commencement.scm
;;; newer than compiled /run/current-system/profile/lib/guile/2.2/site-ccache/gnu/packages/commencement.go
;;; note: source file /home/ludo/src/guix/+core-updates/gnu/packages/commencement.scm
;;; newer than compiled /run/current-system/profile/lib/guile/2.2/site-ccache/gnu/packages/commencement.go
;;; note: source file /home/ludo/src/guix/+core-updates/gnu/packages/commencement.scm
;;; newer than compiled /run/current-system/profile/lib/guile/2.2/site-ccache/gnu/packages/commencement.go
;;; note: source file /home/ludo/src/guix/+core-updates/gnu/packages/commencement.scm
;;; newer than compiled /home/ludo/.cache/guile/ccache/2.2-LE-8-3.A/home/ludo/src/guix/+core-updates/gnu/packages/commencement.scm.go
/gnu/store/crzz4z5k8hpdkbgzqvn7bz3rspq13gb5-bash-static-4.4.12.drv
--8<---------------cut here---------------end--------------->8---
The difference between these two derivations is the build script. In
the second case, it reads this:
--8<---------------cut here---------------start------------->8---
(define %build-inputs
(quote
(("source" . "/gnu/store/hl0xxmm8habnijw7y45dqsp9j5nqxq6i-bash-4.4.tar.xz")
("gcc" . "/gnu/store/a1qrh6iw7gj3f8m0d3v97xc4xrk2qbk9-gcc-cross-boot0-wrapped-5.5.0")
("libc" . "/gnu/store/b6mcmg1wmxz83hd9ffjwzxv9xdb0xsbm-glibc-intermediate-2.26.105-g0890d5379c")
("libc:static" . "/gnu/store/9gy08pnv20v1g1ldmqlsy07lhj2w77gi-glibc-intermediate-2.26.105-g0890d5379c-static")
("ld-wrapper-cross" . "/gnu/store/hmb02fkk0gv2j7l3kb4a1igy6cga7kbl-ld-wrapper-boot0-0")
("binutils-cross" . "/gnu/store/580ywwc0sr3l4dqj36a5jl5ad3yh760b-binutils-cross-boot0-2.28.1")
("make" . "/gnu/store/f7q38v9fh9zz27qinjwscqip8k7fkirs-make-boot0-4.2.1")
("diffutils" . "/gnu/store/96brzsaxvax24qwylwfhb2kjikbm3zhn-diffutils-boot0-3.6")
("findutils" . "/gnu/store/imjcbzjrp4jsvmrznc8xyhja28jgnflv-findutils-boot0-4.6.0")
("file" . "/gnu/store/b18smgaibx4kgbw9sdypdd5x5pxjif5j-file-boot0-5.32")
("coreutils&co" . "/gnu/store/wsb8hrijrss858p2ddwmqwg85z8q719c-bootstrap-binaries-0")
("bash" . "/gnu/store/wsb8hrijrss858p2ddwmqwg85z8q719c-bootstrap-binaries-0")
("kernel-headers" . "/gnu/store/yqahwgll57j88bq275m4xvifg9x3alsb-linux-libre-headers-4.9.59")
("kernel-headers" . "/gnu/store/yqahwgll57j88bq275m4xvifg9x3alsb-linux-libre-headers-4.9.59"))))
--8<---------------cut here---------------end--------------->8---
Notice the “kernel-headers” repetition, which is not in the correct
build script.
The repetition stems from the traversal done by ‘bag-transitive-inputs’,
which relies on pointer identity when comparing packages (via the ‘eq?’
vhash in ‘transitive-inputs’), and for some reason there are two non-eq?
linux-libre-headers packages encountered here. ‘master’ doesn’t have
this problem.
FTR we had a similar issue in <http://bugs.gnu.org/20037> with PAM
services.
Incidentally, I discovered this bug while getting berlin.guixsd.org to
build ‘core-updates’: Cuirass there would exhibit the bug, and thus
berlin would end up building something different from what I have on my
laptop (and what hydra.gnu.org has.)
Ludo’.
^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#30155: 'bag-transitive-inputs' behaves non-deterministically
2018-01-18 11:20 bug#30155: 'bag-transitive-inputs' behaves non-deterministically Ludovic Courtès
@ 2018-01-18 17:09 ` Ludovic Courtès
0 siblings, 0 replies; 2+ messages in thread
From: Ludovic Courtès @ 2018-01-18 17:09 UTC (permalink / raw)
To: 30155-done
ludo@gnu.org (Ludovic Courtès) skribis:
> Notice the “kernel-headers” repetition, which is not in the correct
> build script.
>
> The repetition stems from the traversal done by ‘bag-transitive-inputs’,
> which relies on pointer identity when comparing packages (via the ‘eq?’
> vhash in ‘transitive-inputs’), and for some reason there are two non-eq?
> linux-libre-headers packages encountered here. ‘master’ doesn’t have
> this problem.
This is fixed by 8102cf0b37e100f760d25b500cf91ed38928615c, which makes
sure there’s only one “linux-libre-boot0” package object.
At some point we could change the way ‘transitive-inputs’ checks for
already-visited node, though I think it’d be hard to avoid relying on
eq?-ness.
Ludo’.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-01-18 11:20 bug#30155: 'bag-transitive-inputs' behaves non-deterministically Ludovic Courtès
2018-01-18 17:09 ` Ludovic Courtès
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