bug#46362: got unexpected path `Backtrace:' from substituter

[Ludovic Courtès]

Hi,

Zhu Zihao <all_but_last@163.com> skribis:

> This issue is similar with https://issues.guix.gnu.org/45828. But it
> still not fixed in 127a88d390417d5d7b1b4a18c1b69c7169dcaf34.
>
> When you have multiple substituters, Guix will try to fetch narinfo from
> the second or even third substituters, and it dies.
>
> ```
> chino@asus-laptop:~$ guix build opencv 
> --substitute-urls="https://mirror.sjtu.edu.cn/guix https://mirror.guix.org.cn 
> https://mirror.c1r3u.xyz https://ci.guix.gnu.org";
> substitute: updating substitutes from 'https://mirror.sjtu.edu.cn/guix'... 
> 100.0%
> substitute: 
> guix build: error: got unexpected path `Backtrace:' from substituter
> ```

Commit ee3226e9d54891c7e696912245e4904435be191c addresses the
error-reporting issue: now the backtrace will be properly displayed (we
still need to update the ‘guix’ package before you can deploy the fix.)

> If there's one substituter, it will work and do the substitution.

Did you find out which of these substitute URLs is causing troubles?  I
tried the exact same command and it works for me.

Thanks,
Ludo’.