Clean up boot files: Remove SysV init scripts and deactivate systemd service units generators

[pmenzel]

Starting MarIuX with debug added to the Linux command line, systemd also prints out more debug messages showing some room for improvements.

[    4.530343] Run /init as init process
[    4.532188]   with arguments:
[    4.533824]     /init
[    4.535260]   with environment:
[    4.536944]     HOME=/
[    4.538392]     TERM=linux
[    4.539926]     BOOT_IMAGE=/boot/bzImage-5.7.0-rc4.mx64.333
[    4.542297]     crashkernel=256M
[    4.726715] XFS (sda1): Mounting V5 Filesystem
[    4.924101] XFS (sda1): Ending clean mount
[    5.893730] systemd[1]: Inserted module 'autofs4'
[    6.151949] NET: Registered protocol family 10
[    6.154270] Segment Routing with IPv6
[    6.175690] NET: Registered protocol family 1
[    6.177796] systemd[1]: Inserted module 'unix'
[    6.508744] systemd[1]: systemd 242 running in system mode. (+PAM -AUDIT -SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP +GCRYPT +GNU
TLS +ACL +XZ +LZ4 -SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[    6.516560] systemd[1]: No virtualization found in DMI
[    6.518908] systemd[1]: No virtualization found in CPUID
[    6.521286] systemd[1]: Virtualization XEN not found, /proc/xen does not exist
[    6.524220] systemd[1]: This platform does not support /proc/device-tree
[    6.538969] systemd[1]: UML virtualization not found in /proc/cpuinfo.
[    6.541704] systemd[1]: This platform does not support /proc/sysinfo
[    6.544390] systemd[1]: Found VM virtualization none
[    6.546671] systemd[1]: Detected architecture x86-64.
[    6.557648] systemd[1]: Mounting cgroup to /sys/fs/cgroup/net_cls,net_prio of type cgroup with options net_cls,net_prio.
[    6.666061] systemd-bless-boot-generator[177]: Skipping generator, not booted with boot counting in effect.
[    6.670736] systemd-hibernate-resume-generator[182]: Not running in an initrd, quitting.
[    6.683233] systemd-rc-local-generator[183]: /etc/rc.local does not exist, skipping.
[    6.685485] systemd-rc-local-generator[183]: /usr/sbin/halt.local does not exist, skipping.
[    6.713611] systemd-fstab-generator[179]: Parsing /etc/fstab...
[    6.714041] systemd-gpt-auto-generator[181]: Failed to chase block device '/', ignoring: No such file or directory
[    6.718691] systemd-gpt-auto-generator[181]: sda1: Root device /dev/sda.
[    6.736056] systemd-fstab-generator[179]: Found entry what=/dev/disk/by-label/root where=/ type=xfs makefs=no growfs=no noauto=no nofail=no
[    6.826542] systemd-sysv-generator[186]: Cannot find unit edac.service.
[    6.858709] systemd-sysv-generator[186]: Cannot find unit safenetauthenticationclient.service.
[    6.882502] systemd-sysv-generator[186]: Ignoring S24portmap symlink in rc3.d, not generating portmap.service.
[    6.886367] systemd-sysv-generator[186]: Ignoring S15setclock symlink in rc3.d, not generating setclock.service.
[    6.890278] systemd-sysv-generator[186]: Ignoring S25amd symlink in rc3.d, not generating amd.service.
[    6.893938] systemd-sysv-generator[186]: Ignoring S07mountfs symlink in rc3.d, not generating mountfs.service.
[    6.897425] systemd-sysv-generator[186]: Ignoring S01kernfs symlink in rc3.d, not generating kernfs.service.
[    6.900604] systemd-sysv-generator[186]: Ignoring S12createfiles symlink in rc3.d, not generating createfiles.service.
[    6.904550] systemd-sysv-generator[186]: Ignoring S20sysklogd symlink in rc3.d, not generating sysklogd.service.
[    6.908473] systemd-sysv-generator[186]: Ignoring S11cleanfs symlink in rc3.d, not generating cleanfs.service.
[    6.964661] printk: systemd-sysv-ge: 6 output lines suppressed due to ratelimiting
[    7.447664] systemd-gpt-auto-generator[181]: No suitable partition table found, ignoring.

So, some SysV scripts can be removed from the system or bee packages, and some systemd generators can be deactivated (with a symbolic link to /dev/null in /etc/systemd/generators).