Hi Jonas,
I'd like to talk about this patchset from a non-technical view.
And to be brief, my conclusion is suggesting using some switch, e.g.
DISTRO_FEATURE, to control this 'stateless' behavior.
Please see details below.
This patchset is based on two assumptions:
1) Users would generally want 'stateless' system. Or in other words,
they would prefer 'stateless' more than 'stateful'.
2) Other softwares/upstreams are also working against this 'stateless' goal.
From the current situation, both are not that true. As your [PATCH 7/7]
points out, even systemd defaults to install things under /etc.
Cleaning up systemd's /etc files while leaving other softwares requiring
/etc files is not that pleasant. At a minimum, systemd users who are not
aware of this 'stateless' concept would be confused. "Where's my
/etc/systemd/system.conf file?!" They would ask.
So I'd suggest using something like 'stateless' DISTRO_FEATURE (just
like 'usrmerge') to control each recipe's behavior.
Best Regards,
Chen Qi
On 12/31/2018 08:05 PM, Jonas Bonn wrote:
These patches make some modifications to systemd with the long-term goal
of being able to run OE in systemd's "stateless" configuration.
"Stateless" boils down to building an image with empty /etc and /var
directories so that volatile (tmpfs) filesystems can be mounted there;
this requires that the system subsequently be able to populate these
directories dynamically, which systemd mostly takes care of if things
are done right.
In these patches:
i) Don't include machine-id in writable images so that systemd can run
its first-boot machinery
ii) Move systemd configuration files out of /etc
iii) Allow systemd to dynamically enable services and populate
/etc/systemd/system via the presets mechanism
There's a long way to go to get to a working "stateless" configuration.
Getting to a "volatile" system (just empty /var) should be easier and
I'll post patches moving things in that direction shortly.
/Jonas
Jonas Bonn (7):
systemd: do not create machine-id
systemd-conf: simplify creation of configuration
systemd: move additional conffiles to systemd-conf
systemd: create preset files instead of installing in image
systemd-systemctl-native: simplify and support preset-all
rootfs-postcommands: call preset-all for read-only-rootfs
systemd: do not pre-enable services, rely on presets
meta/classes/rootfs-postcommands.bbclass | 8 ++++
meta/classes/systemd.bbclass | 33 +++++++-------
meta/recipes-core/systemd/systemd-conf.bb | 45 +++++++------------
.../systemd/systemd-systemctl/systemctl | 36 +++------------
meta/recipes-core/systemd/systemd_239.bb | 4 ++
5 files changed, 52 insertions(+), 74 deletions(-)
--
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