Re: [ptxdist] How to express a dependency that can be satisfied by alternative packages

[Michael Olbrich <m.olbrich@pengutronix.de>]

Hi,

On Thu, Jan 02, 2020 at 12:53:36PM +0100, Roland Hieber wrote:
> On Mon, Dec 16, 2019 at 07:23:13PM +0100, Guillermo Rodriguez Garcia wrote:
> > Let's say I have a package that requires a specific cmd line utility
> > (e.g. openvt).
> > This can be provided by two different packages (e.g. busybox or kbd)
> > How to express that dependency in the .in file of my package ?
> 
> PTXdist (or rather kconfig) does not have a notion of "provides" or
> metapackages. I think is currently no way other than making a choice
> option that selects the one or the other, or letting your config option
> deoend on BUSYBOX_OPENVT || KBD_OPENVT. In the latter case it is
> probably good to add a comment above it that depends on the opposite
> value notifying the user that neither one of them is selected (see the
> comment above IPTABLES_INSTALL_IPTABLES_APPLY in iptables.in for
> example).

Actually, the correct way to do this is probably:

	select KBD		if !BUSYBOX_OPENVT && RUNTIME
	select KBD_OPENVT	if !BUSYBOX_OPENVT && RUNTIME

rules/openvpn.in or rules/easy-rsa.in already do something like this.

Using 'depends' is not really a good idea. It hides options and can cause
Dependency Chains that cannot be resolved automatically.

Michael

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

_______________________________________________
ptxdist mailing list
ptxdist@pengutronix.de