[systemd-devel] [PATCH] man: Add a note about what environment variables are available by default.

[Kay Sievers]

On Fri, Jul 26, 2013 at 12:38 PM, Reindl Harald <h.reindl at thelounge.net> wrote:
>
>
> Am 26.07.2013 12:03, schrieb Kay Sievers:
>>>>  man/systemd.exec.xml | 7 +++++++
>>>>  1 file changed, 7 insertions(+)
>>>>
>>>> diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
>>>> index c0e1d86..b78f255 100644
>>>> --- a/man/systemd.exec.xml
>>>> +++ b/man/systemd.exec.xml
>>>> @@ -77,6 +77,13 @@
>>>>                  configuration options are configured in the [Service],
>>>>                  [Socket], [Mount], or [Swap] sections, depending on the unit
>>>>                  type.</para>
>>>> +
>>>> +                <para>All processes are executed in a clean environment in
>>>> +                which only the TERM, PATH, USER, and HOME variables are set
>>>> +                by default.
>>>
>>> They are just preserved, passed-along, not exported or set by default, isn't it?
>>
>> Seems for the system services, only PATH= and the locale are usually set:
>>
>> $ sudo cat /proc/$(pidof systemd-logind)/environ
>> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/binLANG=en_US.UTF-8LC_TIME=de_DE.UTF-8LC_PAPER=de_DE.UTF-8LC_MEASUREMENT=de_DE.UTF-8
>
> on Fedora 18 (systemd-201-2.fc18.7.x86_64) and Fedora 17 (systemd-44-24.fc17.x86_64)
> i see more like BOOT_IMAGE which also appears all in phpinfo()
>
>  cat /proc/$(pidof systemd-logind)/environ
> BOOT_IMAGE=/vmlinuz-3.9.11-200.fc18.x86_64divider=10biosdevname=0LANG=de_DE.UTF-8PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
>
> cat /proc/$(pidof systemd-logind)/environ
> SYSFONT=latarcyrheb-sun16PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/binbiosdevname=0LANG=de_DE.UTF-8divider=20KEYTABLE=de-latin1-nodeadkeysBOOT_IMAGE=/vmlinuz-3.9.10-100.fc17.x86_64

What's currently done for environment variables and the rules how they
are passed-on is not obvious and quite a mess that needs fixing. I'll
look into it now ...

Kay