Re: Removing systemd from Buster: everything gets slow

[Reco <recoverym4n@enotuniq.net>]

	Hi.

On Wed, Nov 06, 2019 at 12:02:04PM -0500, Dan Ritter wrote:
> Reco wrote: 
> > On Tue, Nov 05, 2019 at 10:13:35PM -0500, Dan Ritter wrote:
> > > If you are removing systemd from a Buster installation, and upon
> > > reboot everything is ridiculously slow:
> > > 
> > > Check for the presence of "systemd" options in /etc/nsswitch.conf.
> > 
> > I'm curious. Which libnss-* package failed to remove itself from
> > nsswitch.conf?
> 
> Looks like libnss-systemd

That's interesting. libnss-systemd ships a valid postrm script that's
supposed to do just that - removing "systemd" entries from
nsswitch.conf ($module=systemd, $file=/etc/nsswitch.conf):

    # we must remove possible [foo=bar] options as well
    sed -i -r "/(passwd|group):/ s/[[:space:]]+$module\b([[:space:]]*\[[^]]*\])*//" $file

But:

1) postrm script bails if it finds that libnss-systemd is still
installed, but for another architecture.

2) It invokes "sed", not "/bin/sed", and that's another possible reason
for such failure - locally installed /usr/local/bin/sed which does not
understand "-i" option or misinterprets that regexp.


I suggest you to file a bug against libnss-systemd. They use perl in
postinst already, they might use it in postrm as well.

Reco