systemd/DISTRO_PORTING
Lennart Poettering 2ed3de9cc4 build-sys: warn if people don't change the default NTP servers when building systemd
Also, explain the situation in the docs.

Relates to #437
2015-07-11 14:24:29 -03:00

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Porting systemd To New Distributions
HOWTO:
You need to make the follow changes to adapt systemd to your
distribution:
1) Find the right configure parameters for:
--with-rootprefix=
--with-sysvinit-path=
--with-sysvrcnd-path=
--with-rc-local-script-path-start=
--with-rc-local-script-path-stop=
--with-kbd-loadkeys=
--with-kbd-setfont=
--with-tty-gid=
--with-ntp-servers=
2) Try it out. Play around (as an ordinary user) with
'/usr/lib/systemd/systemd --test --system' for a test run
of systemd without booting. This will read the unit files and
print the initial transaction it would execute during boot-up.
This will also inform you about ordering loops and suchlike
NTP POOL:
By default, timesyncd uses the Google NTP servers
time[1-4].google.com. They serve time that is not standards
compliant, and can be up to .5s off. Google does not
officially support these servers for the broader
audience. Distributions and vendors really should not ship
OSes or devices with these NTP servers configured. Instead,
please register your own vendor pool at ntp.org and make it
the built-in default by passing --with-ntp-servers= to
configure. Registering vendor pools is free:
http://www.pool.ntp.org/en/vendors.html
Again, if you ship your software or device with the default
NTP servers, then you will get served wrong time, and will
rely on services that might not be supported for long.
CONTRIBUTING UPSTREAM:
We generally do no longer accept distribution-specific
patches to systemd upstream. If you have to make changes to
systemd's source code to make it work on your distribution,
unless your code is generic enough to be generally useful, we
are unlikely to merge it. Please always consider adopting the
upstream defaults. If that is not possible, please maintain
the relevant patches downstream.
Thank you for understanding.