[yocto] Changing over to systemd (no dhcp)

[colin.helliwell at ln-systems.com]

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 <armccurdy at gmail.com>
Cc: colin.helliwell at ln-systems.com; Yocto discussion list <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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