$ git clone -n https://src.fedoraproject.org/rpms/kde-gtk-config.git /var/lib/mock/f40-build-2494784-61664/root/chroot_tmpdir/scmroot/kde-gtk-config
Cloning into '/var/lib/mock/f40-build-2494784-61664/root/chroot_tmpdir/scmroot/kde-gtk-config'...
$ git fetch origin 52ba530ccd18749dd5cf3e5024ab1a5246b952c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kde-gtk-config
 * [new ref]         52ba530ccd18749dd5cf3e5024ab1a5246b952c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52ba530 6.0.0