package uninstall & install - different classes

[Martin Krämer]

Hi both,

thank you for your replies.

@Thomas: As of now your proposal or the workaround I am using currently are
both OK for me.
   Additionally I understood that this is more like a "logical bug" and not
really the wanted behavior, but changing is not easily possible on a quick
fix.
   As of today I am on another project but maybe in future I have some
spear time to check the "install_packages" script in more detail and make a
proposal.

@Matteo: Thanks for the provided information & code. (I have something more
or less similar in use)
   Unfortunately this is not really a solution related to the problem since
the definition of classes within $classes variable / FAI_CLASSES file does
not correctly take place here.
   Due to this independently of the definition order of defined classes the
wrong / correct package actions are applied depending on classes order
within install_packages config file.


Am Mo., 6. Mai 2019 um 21:18 Uhr schrieb Matteo Guglielmi <
Matteo.Guglielmi at dalco.ch>:

> This is how I solved my needs to handle or adjust the
>
> order of classes in FAI.
>
>
>
> In my case, I always wanted to define the "essential"
>
> classes in:
>
>
> 50-host-classes
>
>
> and leaving the job of filing up the voids (or even
>
> remove or change the order of classes) to a secondary
>
> script (in my case '60-expand-classes').
>
>
>
> If you find this useful, you are welcome to use it.
>
>
>
>
> ###
>
>
>
> cat /srv/fai/config/hooks/subroutines
>
>
>
>
> prependClass() {
>   sed -ri "/^$2$/i $1" /tmp/fai/FAI_CLASSES
> }
>
> appendClass() {
>   sed -ri "/^$2$/a $1" /tmp/fai/FAI_CLASSES
> }
>
> deleteClass() {
>   sed -ri "/^$1$/d" /tmp/fai/FAI_CLASSES
> }
>
> replaceClass() {
>   sed -ri "/^$2$/c $1" /tmp/fai/FAI_CLASSES
> }
>
> listClasses() {
>   cat /tmp/fai/FAI_CLASSES
> }
>
> assertUfbiClasses() {
>   grep -q '^UFBI' /tmp/fai/FAI_CLASSES || return 1
> }
>
>
>
>
> cat /srv/fai/config/class/50-host-classes
>
>
>
>
> case $HOSTNAME in
>   node01)
>     echo CENTOS75 MLKERNEL UFBIMONITOR UFBIOFED UFBISLURM
>   ;;
>   node02)
>     echo CENTOS76 LTKERNEL UFBIMONITOR UFBIOFED UFBISLURM
>   ;;
>   node03)
>     echo CENTOS75 MLKERNEL UFBIMONITOR UFBIOFED UFBISLURM
>   ;;
>   node04)
>     echo CENTOS76 LTKERNEL UFBIMONITOR UFBIOFED UFBISLURM
>   ;;
>   *)
>     echo CENTOS76
>   ;;
> esac
>
>
>
>
> cat /srv/fai/config/class/60-expand-classes
>
>
>
> if ifclass AMD64 ; then
>   appendClass FAIBASE AMD64
> else
>   exit 700 # we don't support 32-bit OSes
> fi
>
> if ifclass -o CENTOS75 CENTOS76 ; then
>   prependClass CENTOS 'CENTOS7[5-6]'
>
>   if ifclass -o LTKERNEL MLKERNEL ; then
>     if ifclass UFBIOFED ; then
>       replaceClass UFBIIB UFBIOFED
>     fi
>   fi
> fi
>
> if ifclass -o SLES150 SLES151 ; then
>   prependClass SLES 'SLES15[0,1]'
> fi
>
> if ifclass UBUNTU18 ; then
>   prependClass UBUNTU UBUNTU18
> fi
>
> if ifclass DEBIAN9 ; then
>   prependClass DEBIAN DEBIAN9
> fi
>
> if assertUfbiClasses ; then
>   ifclass UFBI || echo UFBI
> fi
>
>
> [ -d /sys/firmware/efi ] && echo EFI || echo BIOS
>
>
>
> ________________________________
> From: linux-fai <linux-fai-bounces at uni-koeln.de> on behalf of Thomas
> Lange <lange at informatik.uni-koeln.de>
> Sent: Monday, May 6, 2019 10:34:40 AM
> To: fully automatic installation for Linux
> Subject: Re: package uninstall & install - different classes
>
> Your observation is correct. The order of classes are important when
> selecting configuration files, but do not matter inside a
> package_config file itself. The script install_packages reads the files in
> subdirectory package_config in the order given by the classes. But each
> file is read from the beginning to the end. If a line
> PACKAGE install CLASSA
> is found it justs checks if CLASSA is also defined, otherwise skips
> this part. So inside thise config the class is more like a true/false flag.
>
> It's not easy to change this, because you can list multiple classes
> after the PACKAGE install marker which forms a logical OR
> function. It's then hard to decide to which class the packages listed
> should be assigned to.
>
> In your case, is it possible to change your config by creating two
> files named CLASS1 and CLASS2 which each include a section PACKAGES
> install STRETCH64? Would that help you?
>
> --
> regards Thomas
>
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