$releasever and $arch substitution in url and mirrorlist, and "Closest mirror" kickstart support?

[Bruno Wolff III]

On Mon, Jul 07, 2014 at 18:10:53 -0700,
  Adam Williamson <adamwill at shaw.ca> wrote:
>So like Vadym Chepkov way back in 2010, I find myself wanting to write
>very generic kickstart files, for validation testing. The Kickstart docs
>claim:
>
>https://fedoraproject.org/wiki/Anaconda/Kickstart#url
>
>"     --mirrorlist=
>
>        The mirror URL to install from. Variable substitution is done
>for $releasever and $basearch in the url (added in F19)."
>
>but I tried using this, and it doesn't seem to work. A kickstart with
>this line:

It looks like it is supposed to work for live images and I thought 
anaconda and livecd-creator shared code for this.

You can look at /usr/lib/python2.7/site-packages/imgcreate/yuminst.py around 
line 150 and you'll see stuff like this:

    def addRepository(self, name, url = None, mirrorlist = None):
        def _varSubstitute(option):
            # takes a variable and substitutes like yum configs do
            option = option.replace("$basearch", rpmUtils.arch.getBaseArch())
            option = option.replace("$arch", rpmUtils.arch.getCanonArch())
            # If the url includes $releasever substitute user's value or
            # current system's version.