Re: [OE-core] How to trigger Yocto Linux /etc/profile or shell scripts in /etc/profile.d without shell logging in?

[Federico Pellegrin <fede@evolware.org>]

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Hi Jupiter,
To centralize, agreed that you are using systemd, one way I could see is
setting the variables in systemd-system.conf using the DefaultEnvironment
directive, see:
https://freedesktop.org/software/systemd/man/systemd-system.conf.html

This states:

----
DefaultEnvironment=¶
<https://freedesktop.org/software/systemd/man/systemd-system.conf.html#DefaultEnvironment=>

Configures environment variables passed to all executed processes. Takes a
space-separated list of variable assignments. See environ(7)
<http://man7.org/linux/man-pages/man7/environ.7.html> for details about
environment variables.

Simple "%"-specifier expansion is supported, see below for a list of
supported specifiers.

Example:

DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"

Sets three variables "VAR1", "VAR2", "VAR3".
----

This should have you variables management in each. Otherwise as you mention
one can put in each script with either Environment to have them explicitly
enumerated or with EnvironmentFile to read from a file, which may also fit
your centralization hopes (but still require one line per startup script at
least) and could be further sourced by non-systemd components as well if
needed. (https://www.freedesktop.org/software/systemd/man/systemd.exec.html
under Environment section)

HTH,
Federico


Il giorno lun 11 ott 2021 alle ore 11:05 Jupiter <jupiter.hce@gmail.com> ha
scritto:

> Hi Federico,
>
> Thanks for your response.
>
> > /etc/profile and similar are interactive shell (/bash) concepts, not
> really
> > system startup ones. So indeed: just on a login (be it local, ssh and so
> > on) they are executed.
>
> Understood, here is what I try to figure out. I use several systemd
> services to start my tasks, each task is not just a system process, I
> found it also has a system environment similar in user login from
> /etcprofile, /home/user/.profile, my question is where is a system
> environment file that each systemd service runs from?
>
> I also thought that /etc/profile.d files should be automatically
> invoked for each user login, but a systemd service does not run
> /etc/profile.d files.
>
> > If you want to execute something else without the need for logging it,
> you
> > should look elsewhere, depending on your system manager: if systemd you
> > should create a service and enable it, if sysvinit a init.d script.
>
> Understood, that was what I did originally, I have to run the setup
> system environment in each service ExecStart script, that is why I am
> looking for a global environment setup file to avoid duplication of
> putting my environment scripts in each ExecStart execution file.
>
> Thank you.
>
> Kind regards,
>
> - jupiter
>
> > HTH,
> > Federico
> >
> >
> > Il giorno lun 11 ott 2021 alle ore 06:30 JH <jupiter.hce@gmail.com> ha
> > scritto:
> >
> >> Hi,
> >>
> >> The Yocto uses /etc/profile for root login, but there is no root
> >> physical login in an embedded device so the /etc/profile is never
> >> called, I added a shell script to /etc/profile.d, it was not called
> >> either. Both /etc/profile and scripts in /etc/profile.d can only be
> >> invoked when I physically log into the debug console, that is
> >> impractical. Appreciate your advice, how do you resolve that kind of
> >> problem?
> >>
> >> Thank you.
> >>
> >> Kind regards,
> >>
> >> - jupiter
> >>
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>
> --
> "A man can fail many times, but he isn't a failure until he begins to
> blame somebody else."
> -- John Burroughs
>

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