Bug#840469: dh_sysuser: should add a dependency to "perl-modules" to remove sysuser.

[Dmitry Bogatov]

>   There is no guarantee that package dependencies will be available
>   when postrm is run, but the depended-on package is more likely to be
>   available if the package declares a dependency (particularly in the
>   case of postrm remove). The postrm script must gracefully skip actions
>   that require a dependency if that dependency isn't available.
>
> So apparently you'll need to handle this deluser failure mode in the
> postrm script.

It is unfortunate. I am considering following patch:

	--- a/postrm-sysuser.sh
	+++ b/postrm-sysuser.sh
	@@ -3,6 +3,8 @@
	 if [ "$1" = purge ] ; then
	        rm -f "$store/$package"
	        if [ $(count_files_in "$store") = 1 ] ; then
	-               deluser --force --remove-home "$username"
	+               home=$(getent passwd "$username"| cut -d: -f6)
	+               deluser --force "$username"
	+               rm -fr --preserve-root --one-file-system -- "$home"
	        fi
	 fi

but I am scared to invoke `rm -fr' with root. I beleive, that deluser would
handle it better then me.

Ah, and by the way, why `adduser' package, from which `deluser' binary comes
is still present during post-rm? `adduser' is not Essential, only Important.

I know that abusing Pre-Depends is frowned upon, but would
Pre-Depends: perl help?

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