bug#40729: Two rottlog servives causes cryptic etc drv failure

[Ludovic Courtès]

Hi,

Christopher Baines <address@hidden> skribis:

> I got this error when reconfiguring with a recent revision of Guix.
>
>
> /builder for `/gnu/store/kbhl4rk6p0z4jbimlqj57vj3dhyjgv4x-etc.drv' failed 
> with exit code 1
> build of /gnu/store/kbhl4rk6p0z4jbimlqj57vj3dhyjgv4x-etc.drv failed
> View build log at 
> '/var/log/guix/drvs/kb/hl4rk6p0z4jbimlqj57vj3dhyjgv4x-etc.drv.bz2'.
> building /gnu/store/59bd67s06inr5vzyxc70yk6garj2aciz-linux-modules.drv...
> cannot build derivation 
> `/gnu/store/n45vq7jbhn5qz24qlgv6a6ginarqs433-system.drv': 1 dependencies 
> couldn't be built
> guix system: error: build of 
> `/gnu/store/n45vq7jbhn5qz24qlgv6a6ginarqs433-system.drv' failed
> chris@guix-hetzner-1 ~$ bzcat 
> /var/log/guix/drvs/kb/hl4rk6p0z4jbimlqj57vj3dhyjgv4x-etc.drv.bz2
> Backtrace:
>            1 (primitive-load "/gnu/store/g4q88pmwr1vy54qpnkz878k3n7f?")
>            0 (symlink "/gnu/store/939n705vmkn8613b8gjc10llvsr5jcwc-?" ?)
>
> ERROR: In procedure symlink:
> In procedure symlink: File exists

Yeah that’s something I noticed here:

  https://lists.gnu.org/archive/html/guix-devel/2020-04/msg00032.html

Commit a322e9d16b227484ce04721fee0f99618cb1007e does that.

The result is not optimal yet because it just says “duplicate entries”.
Ideally we’d be able to show a ‘fold-services’ trace of sorts telling
showing where the faulty entries come from.

Thanks,
Ludo’.