WIP: Add support for older sysv init as well

[afbjorklund]

Not everything is Systemd or OpenRC yet

Previous code was assuming that everything non-systemd is openrc, which failed on some systems.

So look for OpenRC more explicitly, and add some generic fallback for the older SysV-like systems.

• https://en.wikipedia.org/wiki/OpenRC

• https://en.wikipedia.org/wiki/Init#SYSV

All supported minikube distributions are using Systemd, so this is mostly for the "none" driver...

Should test this on some alternative distributions, such as older Ubuntu/CentOS or maybe Devuan.

• Ubuntu 14.04

• CentOS 6

For #2704 and #6954

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[medyagh]

since we dont have integration test for this, is it possible to test this PR in systemd and init.d distro ot make sure we dont break the current cases? and put the output in the description ?

the cloud shell users need this for none driver

[afbjorklund]

since we dont have integration test for this, is it possible to test this PR in systemd and init.d distro ot make sure we dont break the current cases? and put the output in the description ?

the idea was that there should be no changes for users of systemd and openrc, i.e. all the currently covered sysinit

systemctl --version => systemd

openrc --version ==> openrc

what init system does cloud shell use ? I suppose we could do some even more basic fallback, if both redhat and debian fail

redhat: /etc/rc.d/init.d/functions

debian: /lib/lsb/init-functions

Also, the Enable seems to be totally unimplemented for OpenRC at the moment ? And we are hard-coding systemctl still:

pkg/minikube/cruntime/docker.go: rr, err := runner.RunCmd(exec.Command("sudo", "systemctl", "cat", "docker.service"))

[afbjorklund]

Also note that they are pretty identical (openrc.go and sysv.go), we mostly need to replace start-stop-daemon

https://wiki.alpinelinux.org/wiki/Writing_Init_Scripts

We're assuming here that the standard service wrapper is available, so we can do basic start|stop|restart|status

# /usr/bin/service
#
# A convenient wrapper for the /etc/init.d init scripts.
#
# This script is a modified version of the /sbin/service utility found on
# Red Hat/Fedora systems (licensed GPLv2+).

https://salsa.debian.org/debian/init-system-helpers/-/blob/master/script/service

Not to be confused with the rc-service program in openrc...

As used in for instance Alpine, and some other distributions:

/ # file /sbin/service 
/sbin/service: symbolic link to /sbin/rc-service
/ # file /sbin/rc-service 
/sbin/rc-service: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-x86_64.so.1, stripped