There was a discussion earlier today in #centos-devel about a way to build live iso images on cbs.centos.org.

Koji seems to permit to do that through "koji spin-livecd"

Documentation is available here : https://docs.pagure.org/koji/image_build/

One thing to keep in mind though is that one needs to have livecd-tools pkg installed, and corresponding to the os distro/version the livecd will be based on : you need a centos 7 host to build a centos 7 liveCD and that can't work to build a centos 6 liveCD (see as an example https://bugzilla.redhat.com/show_bug.cgi?id=1035276)

Depending on the target audience, and if we only want to build centos 7 live media, I can add an additional koji builder, running centos 7 and livecd-tools (from extras, and the one we use to build also the centos live media found on mirror.centos.org)

My only concern (but has to be tested) is this : (from the koji doc linked above) :

"The image building tasks will fail if your image tries to include a package that was not built in your build system. This is because the package does not have any origin information stored in Koji’s database."

That can be a problem as *no* pkg from the CentOS 7 distro was built on cbs.centos.org

Opinions, ideas, workaround ?