Bug#923478: initscripts use unsafe `: >` shell command to create files

[Dmitry Bogatov]

[2019-04-08 20:20] Cristian Ionescu-Idbohrn <cristian.ionescu-idbohrn at axis.com>
> On Mon, 8 Apr 2019, Dmitry Bogatov wrote:
> > [2019-04-07 10:52] Cristian Ionescu-Idbohrn <cristian.ionescu-idbohrn at axis.com>
> > > On Sat, 6 Apr 2019, Dmitry Bogatov wrote:
> > >
> > > The redirection in /etc/init.d/bootmisc.sh on line 29 is _not_ error 
> > > handled.  Writing to a file can fail (for various reasons).
> > >
> > > OTOH, the redirection in /lib/init/bootclean.sh on line 22 _is_ error 
> > > handled.
> > 
> > Good catch. Mind to send a patch into a separate bug?
>
> Sure.  So, what do you want it to do when truncating /var/run/utmp 
> fails?
>
>      29         : > /var/run/utmp
>      30         if grep -q ^utmp: /etc/group
>      31         then
>      32                 chmod 664 /var/run/utmp
>      33                 chgrp utmp /var/run/utmp
>      34         fi

Warning message and make do_start return 1, I guess.

By the way, is

	# Create /var/run/utmp so we can login
	
comment still accurate? I am confident, that `fgetty' does not check for
presence of /var/run/utmp, and at glance, I can't find code in
src:util-linux, that would prevent login when /var/run/utmp is absent.
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