Greetings,
The subject of this should probably be "CentOS 7 LiveMedia images" but I wanted to keep it in the current thread.
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Sorry for dumb question, what URL to put in main repository mirror path?
If you are asking with regards to a kickstart file for livecd-creator? Well the current (and surely very temporary) build tree is what you want... and there isn't a mirrorlist so you have to use a baseurl reference like so:
repo --name=centos7alpha --baseurl=http://buildlogs.centos.org/centos/7/os/x86_64-20140614/
I made a local mirror of the build tree so I could build over and move (although yeah, I do use a cache directory in my livecd-creator command line) and subsituted the URL for that and it worked great with a hacked up version of a kickstart I borrowed from the Fedora 19 spin-kickstarts package... before I discovered the ones Fabian Arrotin posted. If you have trouble with the public samples, email me directly and I'll give you a copy of the one that worked for me.
TYL,