Re: Understanding package dependencies
On Sun, Oct 08, 2023 at 10:47:58AM +0200, Jörg-Volker Peetz wrote:
> Greg Wooledge wrote on 07/10/2023 20:45:
> > unicorn:~$ apt list '?provides(~nlsb-base)'
> > Listing... Error!
> > E: input:0-21: error: Unrecognized pattern '?provides'
> > ?provides(~nlsb-base)
> > ^^^^^^^^^^^^^^^^^^^^^
> >
> How about
>
> apt list '?reverse-depends(?name(lsb-base))'
Reverse-depends isn't the same as Provides, though.
unicorn:~$ aptitude search '~Pmail-transport-agent'
p courier-mta - Courier mail server - ESMTP daemon
p courier-mta:i386 - Courier mail server - ESMTP daemon
p dma - lightweight mail transport agent
p dma:i386 - lightweight mail transport agent [...]
unicorn:~$ apt list '?reverse-depends(~nmail-transport-agent)'
Listing... Done
unicorn:~$
The only way I know of, to get that list from apt, is by parsing it
out of the output of "apt-cache showpkg".
unicorn:~$ apt-cache showpkg mail-transport-agent | sed -n '/^Reverse Provides/,$p'
Reverse Provides:
mta-local 1.0 (= )
exim4-daemon-light 4.96-15+deb12u2 (= )
exim4-daemon-heavy 4.96-15+deb12u2 (= )
dma:i386 0.13-1+b1 (= )
ssmtp 2.64-11 (= )
[...]
Which is... better than nothing, admittedly, but it still mystifies me
why this *one* feature is excluded from apt-patterns, when so many others
are included.
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