RE: [PATCH 1/1] fix on-first-boot for systemd >= 247

["Moessbauer, Felix" <felix.moessbauer@siemens.com>]

> -----Original Message-----
> From: Schild, Henning (T CED SES-DE) <henning.schild@siemens.com>
> Sent: Friday, July 22, 2022 10:27 AM
> To: Schmidl, Tobias (T CED SES-DE) <tobiasschmidl@siemens.com>
> Cc: isar-users@googlegroups.com; Moessbauer, Felix (T CED SES-DE)
> <felix.moessbauer@siemens.com>; Kiszka, Jan (T CED)
> <jan.kiszka@siemens.com>; Schmidl, Tobias (SI EP MF GWA EA 4)
> <tobias.schmidl@siemens.com>
> Subject: Re: [PATCH 1/1] fix on-first-boot for systemd >= 247
> 
> Am Fri, 22 Jul 2022 10:02:35 +0200
> schrieb "Schmidl, Tobias (T CED SES-DE)" <tobiasschmidl@siemens.com>:
> 
> > Hi Felix,
> >
> > Am Freitag, dem 22.07.2022 um 00:04 +0200 schrieb Felix Moessbauer:
> > >
> > > This patch fixes the bug that /etc/machine-id is never generated
> > > when running from within an initrd with an ro rootfs.
> > >
> > > In this case, the magic value "uninitialized" has to be used instead
> > > of deleting the file.
> > >
> >
> > Unfortunately, this doesn't seem to work on debian-buster (for
> > qemuamd64):
> >
> > ```
> > Jul 22 07:52:21 localhost systemd[1]: System cannot boot: Missing
> > /etc/machine-id and /etc is mounted read-only. Jul 22 07:52:21
> > localhost systemd[1]: Booting up is supported only when: Jul 22
> > 07:52:21 localhost systemd[1]: 1) /etc/machine-id exists and is
> > populated. Jul 22 07:52:21 localhost systemd[1]: 2) /etc/machine-id
> > exists and is empty. ```
> 
> Sounds like one more >= cases to cover, and another number to find for when it
> changed in systemd.

I don't know if we will find a solution for buster as the bug only has been fixed for system >= 247.
For the technical reasoning, have a look here at [1].

> Ideally the numbers would be the ones where systemd
> really changed things, not the numbers we find in debian releases ... who knows
> whether ubuntu uses the same ones, or what is in some inbetween package
> feeds like backports.

The corresponding commit in systemd is a48627ef and I just checked which git tags contain that commit to get the version number.
So that should be fine.

PS: I just added the "right" Tobias and removed the other one.
Please apology for the confusion.

Felix

[1] https://github.com/systemd/systemd/pull/16939

> 
> Henning
> 
> > Kind regards,
> >
> > Tobias