With just `After=` we'll still try to run in the scenario
where `sysroot.mount` fails because the rootfs didn't appear.
And this will end up spewing an error which can confuse people
into thinking something is wrong at the ostree level.
This has come up numerous times w/{Fedora,RHEL} CoreOS, most
recently while looking at
https://bugzilla.redhat.com/show_bug.cgi?id=1803130
Previously, we were preparing the root very late in the boot process;
right before we switch root. The issue with that is that most services
in the initrd that run `After=initrd-root-fs.target` expect that
`/sysroot` already points to the rootfs we'll be pivoting to. Running
this late violates that assumption.
This patch fixes this by making `ostree-prepare-root.service` instead
run right after `sysroot.mount` (the physical sysroot mounted by
systemd) but still before `initrd-root-fs.target` (which is the target
signalling that `/sysroot` is now valid and ready).
This should make it easier to integrate OSTree with other initrd
services such as Ignition.
Related: https://github.com/dustymabe/ignition-dracut/issues/20Closes: #1759
Approved by: cgwalters
For the same reasons as #1697. This is especially important in services
that are likely to be used as an `After/Before=` target in other units.
`ostree-prepare-root.service` is one such service.
Closes: #1759
Approved by: cgwalters
It's a neat way to point folks to the documentation (of course, better
would be to have man pages for each of those services). Also
consistently use Title Case everywhere.
Closes: #1750
Approved by: cgwalters
Follow systemd units in using emergency.target, not emergency.service
(which is the sole unit, by default, in emergency.target) so we can
easily reconfigure the units which are actived when entering
emergency mode.
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Closes: #1665
Approved by: cgwalters
Why not to use libexecdir?
Because this directory does not exist on some distros or paths
between distros varies. There are several reasons why a well
known path is prefered, for example when generating a kernel
command line:
init=${ostree}/usr/lib/ostree-boot/ostree-prepare-root
In addition this saves us some typing in a console when wanting
to access the "ostree" cmd line.
Closes: #449
Approved by: cgwalters
Joseph Marrero
Simon McVittie
Colin Walters
Jonathan Lebon
Alex Kiernan
Gatis Paeglis
Daniel Narvaez