bug#50945: Guix home: No such file or directory: "/run/user/1003/on-first-login-executed"

[Xinglu Chen <public@yoctocell.xyz>]

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Hi,

On Thu, Oct 07 2021, Andrew Tropin wrote:

> On 2021-10-01 17:46, Jan Nieuwenhuizen wrote:
>
>> Hi,
>>
>> When using su or sudo to enter an account managed by guix home, I get
>> this error
>>
>> --8<---------------cut here---------------start------------->8---
>> Backtrace:
>>            2 (primitive-load "/home/guix/.guix-home/on-first-login")
>> In ice-9/ports.scm:
>>    461:11  1 (call-with-output-file "/run/user/1003/on-first-login-…" …)
>> In unknown file:
>>            0 (open-file "/run/user/1003/on-first-login-executed" "w" …)
>>
>> ERROR: In procedure open-file:
>> In procedure open-file: No such file or directory: "/run/user/1003/on-first-login-executed"
>> --8<---------------cut here---------------end--------------->8---
>>
>> [...]
>
> Thank you for a very detailed report.
>
> pam_elogind doesn't create a session, when the login shell spawned by
> sudo or su => XDG_RUNTIME_DIR not get created => this message appears.
>
> I think we can omit execution of any processes by on-first-login script
> in case session wasn't created.  Added the check:
>
> From aab6df0298963fe91a6ebfd1dadbc1530eceeff7 Mon Sep 17 00:00:00 2001
> From: Andrew Tropin <andrew@trop.in>
> Date: Thu, 7 Oct 2021 08:12:04 +0300
> Subject: [PATCH] home-services: on-first-login: Check if XDG_RUNTIME_DIR
>  exists.
>
> * gnu/home-services.scm (on-first-login): on-first-login won't execute
> anything if XDG_RUNTIME_DIR doesn't exists.
> ---
>  gnu/home-services.scm | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/gnu/home-services.scm b/gnu/home-services.scm
> index 9f1e986616..0b77a1321d 100644
> --- a/gnu/home-services.scm
> +++ b/gnu/home-services.scm
> @@ -286,8 +286,11 @@ will be put in @file{~/.guix-home/files}.")))
>         ;; XDG_RUNTIME_DIR dissapears on logout, that means such trick
>         ;; allows to launch on-first-login script on first login only
>         ;; after complete logout/reboot.
> -       (when (not (file-exists? flag-file-path))
> -         (begin #$@gexps (touch flag-file-path))))))
> +       (if (file-exists? xdg-runtime-dir)
> +           (when (not (file-exists? flag-file-path))

Use (unless …) instead of (when (not …)…).

> +             (begin #$@gexps (touch flag-file-path)))
> +           (display "XDG_RUNTIME_DIR doesn't exists, the session wasn't
> +created, on-first-login script won't execute anything.")))))

It would be good to tell the user how they could manually run the
script, that way they could manually set/create $XDG_RUNTIME_DIR and run
the script.

  "XDG_RUNTIME_DIR doesn't exist; the 'on-first-login' script won't
  execute anything.  You can manually execute the script by running
  '$HOME/.guix-home/on-first-login'

WDYT?

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