GNU bug report logs - #45444
depmod: ERROR: could not open directory /lib/modules/5.10.2-gnu

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jonathan Brielmaier <jonathan.brielmaier <at> web.de>
To: bug-guix <bug-guix <at> gnu.org>
Subject: depmod: ERROR: could not open directory /lib/modules/5.10.2-gnu
Date: Sat, 26 Dec 2020 11:28:13 +0100

depmod doesn't seem to be happy about our paths...

```
# depmod
depmod: ERROR: could not open directory /lib/modules/5.10.2-gnu: No such
file or directory
depmod: FATAL: could not search modules: No such file or directory
```

Happens on up to date master branch:
```
$ guix system describe
Generation 129	Dec 26 2020 11:13:28	(current)
  file name: /var/guix/profiles/system-129-link
  canonical file name: /gnu/store/yb73df860bd39hzrbvhz79ydqyqfbbdh-system
  label: GNU with Linux-Libre 5.10.2
  bootloader: grub
  root device: UUID: d5e47476-ccdb-4dd5-8f69-f670d5ab25a0
  kernel:
/gnu/store/si6ly6im9ih9fpycp5zq1895y2jl4kzm-linux-libre-5.10.2/bzImage
  channels:
    guix:
      repository URL: https://git.savannah.gnu.org/git/guix.git
      branch: master
      commit: 7be871bb69b8df20e566aa3d078b8cbe453693e2
  configuration file:
/gnu/store/gy14nza51q9s8fyhd53caaf0bvv3363w-configuration.scm
```

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Tobias Geerinckx-Rice <me <at> tobias.gr>
To: Jonathan Brielmaier <jonathan.brielmaier <at> web.de>
Cc: 45444 <at> debbugs.gnu.org, bug-guix <at> gnu.org
Subject: Re: bug#45444: depmod: ERROR: could not open directory
 /lib/modules/5.10.2-gnu
Date: Sat, 26 Dec 2020 22:57:27 +0100

[Message part 1 (text/plain, inline)]

Hi Jonathan,

Jonathan Brielmaier 写道：
> depmod doesn't seem to be happy about our paths...

...and?  :-)

Would I be correct if I guessed that you're using some third-party 
script/how-to that thinks it should run depmod?  That's not 
generally true.  It's also incompatible with (or, irrelevant on) 
Guix by design.  With any system with a read-only root fs, in 
fact.  *points at cloud*  I wonder what depmod does on such 
systems.

 $ sudo depmod -b /run/booted-system/kernel
 depmod: ERROR: 
 openat(/run/booted-system/kernel/lib/modules/5.10.0-r3-16.2429ba5-X230, 
 modules.dep.32260.31994.1609018567, 301, 644): Read-only file 
 system

Followed by about ten more similar errors.  Do we care?  Why?

Thanks for starting the discussion,

T G-R

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