[yocto] Changing over to systemd (no dhcp)

Thu Jan 19 02:06:50 PST 2017

Thanks Chen.

Currently looking into getting networkd hooked in. (no luck yet!)

I'll also look into moving stuff from local.conf to elsewhere, but where you
say "Distro conf files are not suitable for such kinds of modification", I'm
wondering what sort of modifications they *are* suitable/intended for? (i.e.
the purpose of a distro as opposed to an image recipe)

From: ChenQi [mailto:Qi.Chen at windriver.com] 
Sent: 19 January 2017 08:32
To: colin.helliwell at ln-systems.com; 'Rick Altherr' <raltherr at google.com>;
'Andre McCurdy' <armccurdy at gmail.com>
Cc: 'Yocto discussion list' <yocto at yoctoproject.org>
Subject: Re: [yocto] Changing over to systemd (no dhcp)

Hi Colin,

For the dhcp problem, what you need is a network manager. Any network
manager that supports dhcp would do the job. systemd-networkd might be
sufficient in your case.

For the local.conf problem, you could use a layer to manage all common
things shared by the team.

For the package adding problem, it depends on the purpose.
1) if adding the package is only for local work (dev or test), do it in
local.conf
2) otherwise, do it in image recipe
Distro conf files are not suitable for such kinds of modification.

Best Regards,
Chen Qi

On 01/19/2017 03:21 PM, colin.helliwell at ln-systems.com
<mailto:colin.helliwell at ln-systems.com>  wrote:

Yes, I'd agree with that, Rick.

We run automated regression builds from a fresh version control checkout -
but because local.conf is generated when the build environment is set up, it
isn't suitable for version control. So any mods to it found during
development have to be (remembered to be) put into local.conf.sample, so
that the same build is assured for anyone anywhere.

I've long felt/assumed that local.conf was for truly local mods, for that
user and/or for their temporary try-outs.

Similarly - and this is going even more off-topic so I'll save the detail
for a separate thread - I've still not yet got to grips with whether, when I
want to add a particular package, I should be modifying my image recipe or
set up a custom distro)

From: Rick Altherr [mailto:raltherr at google.com] 
Sent: 19 January 2017 00:22
To: Andre McCurdy  <mailto:armccurdy at gmail.com> <armccurdy at gmail.com>
Cc: colin.helliwell at ln-systems.com <mailto:colin.helliwell at ln-systems.com> ;
Yocto discussion list  <mailto:yocto at yoctoproject.org>
<yocto at yoctoproject.org>
Subject: Re: [yocto] Changing over to systemd (no dhcp)

I was wondering about this recently.  Why are these snippets put in
local.conf.sample.extended instead of separate, well-named .inc files that
can be shared by multiple distros?  The current model seems to encourage
putting lots of configuration in local.conf that probably should be in the
distro or machine conf.

Rick

On Wed, Jan 18, 2017 at 1:35 PM, Andre McCurdy <armccurdy at gmail.com
<mailto:armccurdy at gmail.com> > wrote:

On Wed, Jan 18, 2017 at 7:10 AM,  <colin.helliwell at ln-systems.com
<mailto:colin.helliwell at ln-systems.com> > wrote:

> We have a configuration for our embedded system which is working via SysV,
> but we're investigating moving over to systemd.
>
> Not sure if this is 'wise' - if anyone has technological arguments
> for/against then I'd be interested - but I wanted to investigate it
anyway.
>
> I've modified local.conf (right or wrong) with
>
>   DISTRO_FEATURES_append = " systemd"
>   VIRTUAL-RUNTIME_init_manager = "systemd"
>   DISTRO_FEATURES_BACKFILL_CONSIDERED = "sysvinit"
>   VIRTUAL-RUNTIME_initscripts = ""
>   KERNEL_ENABLE_CGROUPS = "1"
>
> I also found a readme
> (https://cgit.freedesktop.org/systemd/systemd/tree/README#n37) about the
> kernel requirements for systemd, and it does at least now boot.
>
> However although eth0 is coming up ('ifconfig eth0'), there doesn't seem
to
> be any dhcp happening - no IP etc.
>
> Previously (under SysV) I had the busybox dhcp client; now it seems that
is
> missing. There's a symlink /etc/systemd/system/busybox-udhcpc.service to
> /dev/null
>
> I'm using
>
>   Poky Jethro
>   Kernel 4.4.0
>   Busybox 1.23.2 (with 'CONFIG_FEATURE_SYSTEMD=y')
>
> I wondered if this is just a simple switch I'm missing somewhere, or is
> there a whole load more modifications I need to dig into and hand-craft?
> (Was hoping for something 'out of the box'..)

Try:

  VIRTUAL-RUNTIME_initscripts = "systemd-compat-units"

Enabling systemd is somewhat documented by the example in
{meta-poky,openembedded-core/meta}/conf/local.conf.sample.extended,
which is:

#
# Use systemd for system initialization
#
# DISTRO_FEATURES_append = " systemd"
# DISTRO_FEATURES_BACKFILL_CONSIDERED += "sysvinit"
# VIRTUAL-RUNTIME_init_manager = "systemd"
# VIRTUAL-RUNTIME_initscripts = "systemd-compat-units"

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