How should mock behave when DNF is not available?

[Mike Bonnet]

On 2/11/15 6:33 AM, Clark Williams wrote:
> On Wed, 11 Feb 2015 08:59:23 -0500
> Josh Boyer <jwboyer at fedoraproject.org> wrote:
>
>> On Wed, Feb 11, 2015 at 8:51 AM, Miroslav Suchy <msuchy at redhat.com> wrote:
>>> I am working on switching rawhide targets to DNF. However on EL* is DNF not
>>> available.
>>
>> Mock isn't available on EL* either.  It's in EPEL.
>>
>>> Therefore you will not be able to build rawhide packages on EL7- using
>>> standard mock configuration.
>>
>> Can DNF be packaged for EL7- in EPEL and used that way?
>>
>>> I see several options to offer to user:
>>>
>>> 1) Discourage user from doing that by providing no hints how to workaround
>>> it.
>>>
>>> 2) Tell him that DNF is not available and he must run mock with "--yum"
>>> option. And warn him that he may get different depsolving.
>>>
>>> 3) Tell him that DNF is not available and fall back automatically to yum and
>>> warn him that he may get different depsolving.
>>>
>>> Unless somebody will have better idea I would go with (2).
>>>
>>> Ideas? Comments?
>>
>> If DNF can't be packaged in EPEL, then I would agree option 2 seems to
>> be the best choice.
>
> Why not #3? Seems silly to make someone restart the command when we
> know that we'll need to use yum.
>
> I'd say just shout loudly that dnf is not available, internally shift
> to yum and do the build.

+1