Openrc service files are non-functional if sys-apps/openrc isn't yet installed on the system

[Peter-Levine]

System information

Type	Version/Name
Distribution Name	Gentoo Linux
Distribution Version	17.1
Kernel Version	5.10.61-gentoo-x86_64
Architecture	x86_64
OpenZFS Version	zfs-2.1.1-r2-gentoo / zfs-kmod-2.1.1-r0-gentoo

Describe the problem you're observing

When switching from systemd to openrc on Gentoo, if sys-fs/zfs is merged before sys-apps/openrc then zfs service scripts appear to succeed but have no effect.

Describe how to reproduce the problem

(Switch from a systemd to a non-systemd profile, eg.)

eselect profile set  default/linux/amd64/17.1/desktop/plasma
emerge -1 sys-fs/zfs sys-apps/openrc

The issue occurs because of:

zfs/config/zfs-build.m4

Line 572 in 90b77a0

AS_IF([test -x "/sbin/openrc-run"],

In general, Gentoo installs openrc init scripts and systemd unit files unconditioally. This removes the need for dependencies on individual init systems and aids the transition between openrc and systemd. All openrc init scripts are expected to have the shebang #!/sbin/openrc-run. AFAICT, it's the same for Alpine, though they package the init scripts seperatly and don't support systemd.

See https://bugs.gentoo.org/820278

[rincebrain]

You probably want to reopen this, I think, lest it get lost in the shuffle if your PR doesn't get merged in a timely fashion.

[gyakovlev]

similar issue: #8204