[Aptitude-devel] Bug#956390: aptitude -o complains about empty value

[Dmitry Alexandrov]

David Kalnischkies <david at kalnischkies.de> wrote:
> That said, it might make sense to be able to set an empty value from the cmdline, yes, but apt doesn't have a way for it either

It seems, that tools from apt package now (ver. 2.2.3) _do_ allow to unset an apt.conf(5) option by using `-o`:

	$ apt-cache policy
	Package files:
	 100 /var/lib/dpkg/status
	     release a=now
	 500 https://deb.debian.org/debian rc-buggy/main amd64 Packages
	     release o=Debian,a=experimental,n=experimental,l=Debian,c=main,b=amd64
	     origin deb.debian.org
	 990 https://deb.debian.org/debian sid/main amd64 Packages
	     release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=amd64
	     origin deb.debian.org
	Pinned packages:

	$ apt-cache -o APT::Default-Release='' policy
	Package files:
	 100 /var/lib/dpkg/status
	     release a=now
	 500 https://deb.debian.org/debian rc-buggy/main amd64 Packages
	     release o=Debian,a=experimental,n=experimental,l=Debian,c=main,b=amd64
	     origin deb.debian.org
	 500 https://deb.debian.org/debian sid/main amd64 Packages
	     release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=amd64
	     origin deb.debian.org
	Pinned packages:

While aptitude(8) still complains about syntax:

	$ aptitude -o APT::Default-Release='' show
	-o requires an argument of the form key=value, got APT::Default-Release=

Should not it be brought into the line?
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