[CentOS-devel] URLs in centos-release-<sig> packages: /altarch vs. /centos/

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Hi Folks,

Now that we have SIG Content in the /altarch directories for CentOS 7 on the
mirrors, we need to come with some requirements and recommendations for dealing
with the different locations. 

tl;dr The current thinking is to add the following snippet in the %post of
centos-release and release to all of the arches. This will set a yum var to the
correct content location when a new system gets installed: 

    `uname -m | grep -q 'x86_64'  && echo 'centos' >/etc/yum/vars/contentdir || echo 'altarch' >/etc/yum/vars/contentdir`

Here's the start of a proposal from the SIG perspective

## Requirements:

- - The same noarch binary RPM *must* be distributable to the Extras
  repo for each architecture

- - The centos-release-<SIG> packages *must* require centos-release


## New Recommendations for creating a centos-release file:

- - A yum variable called 'contentdir' will be populated with the toplevel
  directory for SIGs to use

1.) Modify baseurls in the SIG repo files to look like the following (using
openstack-queens as an example):


 [centos-openstack-queens]
 name=CentOS-7 - OpenStack queens
 baseurl=https://mirror.centos.org/$contentdir/cloud/$basearch/openstack-queens/
 gpgcheck=1
 enabled=1
 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Cloud
 exclude=sip,PyQt4


## Discussion

I'd like to hear thoughts, additions, and subtractions here before we update
the SIGGuide and rework centos-release. 

Cheers!

- --
Brian Stinson
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