[bug#43769] [PATCH v2 2/2] guix-install.sh: Check the service 'nscd' and suggest it.

[zimoun <zimon.toutoune@gmail.com>]

>> In practice, you enable nscd by running ‘apt install nscd’ or similar,
>> and I think we cannot guess what the right command is.  WDYT?
>
> I agree: I was under the assumption that nscd is commonly installed as part of
> the base OS, but disabled by default at the init system level.  If that's not
> likely to be true, don't let's bother.

>> ask and then try to start the service depending on the init system if nscd
>> is not running
>
> If the distro equivalent of ‘service start nscd’ works in the *common* case, I
> like it.  Otherwise a warning/suggestion to manually install & enable it is
> fine.
>
> My general point was that guix-install.sh should do as much as it can with the
> information it already has ($INIT_SYS) and be consistent in using it, not that
> we start sniffing $LEGACY_PKG_MANAGER too :-)

As said, I have tried somehting like this uglyness… but it’s wrong!  It
is overcomplicated and if the package is installed, then it is highly
probable that is running.  I mean 2 kind of users:

 - the noob as me: “Please install nscd” and the I do “aptitude install
   nscd” and my distro takes care of everything (start it etc.)
   
 - the control-freak: they knows what to do with the message “Please
   install nscd”.

And we can try to guess the distro… but again it is overcomplicated.


So it’s not useful.  A message is enough.  Please give a look at v3.

Thanks,
simon

--8<---------------cut here---------------start------------->8---
sys_enable_nscd()
{ # Check if nscd is up and suggest to start it or install it
    flag=""
    if [ "$(type -P pidof)" ]; then
        if [ ! "$(pidof nscd)" ]; then
            _msg "${INF}We recommend installing and/or starting your distribution 'nscd' service"
            while true; do
                read -p "Permit to try starting your 'nscd' service? (yes/no) " yn
                case $yn in
                    [Yy]*) case "$INIT_SYS" in
                               upstart)
                                   { initctl reload-configuration;
                                     /etc/init/ &&
                                         start nscd; } &&
                                       _msg "${PAS}enabled 'nscd' service via upstart"
                                   ;;
                               systemd)
                                   if [ ( systemctl daemon-reload &&
                                              systemctl enable nscd &&
                                              systemctl start nscd; ) ]; then
                                       _msg "${PAS}enabled 'nscd' service via systemd";
                                   else
                                       flag=failure
                                   fi

                                   ;;
                               sysv-init)
                                   { update-rc.d nscd defaults &&
                                         update-rc.d nscd enable &&
                                         service nscd start; } &&
                                       _msg "${PAS}enabled 'nscd' service via sysv"
                                   ;;
                               openrc)
                                   { rc-update add nscd default &&
                                        rc-service nscd start; } &&
                                       _msg "${PAS}enabled 'nscd' service via OpenRC"
                                   ;;
                               NA|*)
                                   _msg "${ERR}unsupported init system; run the 'ncsd' service manually"
                                   ;;
                           esac;
                           break;;
                    [Nn]*) _msg "${INF}Skipped 'nscd' service"
                           flag=failure
                           break;;
                    *) _msg "Please answer yes or no.";
                esac
            done
        fi
    else
        _msg "${WAR}We cannot determine1 if your distribution 'nscd' service is running"
        failure=failure
    fi
    if [[ $flag == failure ]]; then
        _msg "${WAR}Please read 'info guix \"Application Setup\"' about \"Name Service Switch\""
    fi
}
--8<---------------cut here---------------end--------------->8---