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

From: Andrew Tropin <[email-masked]>
Date: Mon, 08 Nov 2021 12:24:35 +0300

On 2021-11-05 17:58, Xinglu Chen wrote:

> 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 <[email-masked]>
>> 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?

Addressed suggestions, attaching updated patch.

From 8b924b02ab917632047d6653f19d9b16175989bf Mon Sep 17 00:00:00 2001
From: Andrew Tropin <[email-masked]>
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 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/gnu/home/services.scm b/gnu/home/services.scm
index 5c9b743f7b..1e295b6afe 100644
--- a/gnu/home/services.scm
+++ b/gnu/home/services.scm
@@ -286,8 +286,13 @@ (define (compute-on-first-login-script _ gexps)
        ;; 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 #$@gexps (touch flag-file-path))))))
+       (if (file-exists? xdg-runtime-dir)
+           (unless (file-exists? flag-file-path)
+             (begin #$@gexps (touch flag-file-path)))
+           (display "XDG_RUNTIME_DIR doesn't exists, on-first-login script
+won't execute anything.  You can check if xdg runtime directory exists,
+XDG_RUNTIME_DIR variable is set to apropriate value and manually execute the
+script by running '$HOME/.guix-home/on-first-login'")))))
 
 (define (on-first-login-script-entry m-on-first-login)
   "Return, as a monadic value, an entry for the on-first-login script
-- 
2.33.0

Also, added a note about elogind/XDG_RUNTIME_DIR to manual.

From f5d35fd4f542a11226c0159ee32498e374ff40a2 Mon Sep 17 00:00:00 2001
From: Andrew Tropin <[email-masked]>
Date: Mon, 8 Nov 2021 12:22:04 +0300
Subject: [PATCH] doc: Add a note about elogind and XDG_RUNTIME_DIR for Guix
 Home.

* doc/guix.texi (Declaring the Home Environment): Add a note about elogind and
XDG_RUNTIME_DIR.
---
 doc/guix.texi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index 3355a535ad..36437cf161 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -35916,6 +35916,13 @@ guix home reconfigure config.scm
 This ``builds'' your home environment and creates @file{~/.guix-home}
 pointing to it.  Voilà!
 
+@quotation 
+Ensure that operating system has elogind or any other mechanism, which
+creates xdg runtime directory and sets @env{XDG_RUNTIME_DIR} variable.
+Otherwise, @file{on-first-login} script won't execute anything, and
+process like userland Shepherd and its descendants won't start.
+@end quotation
+
 @node Configuring the Shell
 @section Configuring the Shell
 This section is safe to skip if your shell or shells are managed by
-- 
2.33.0

Oleg, please apply it if it looks good.

-- 
Best regards,
Andrew Tropin