$ git clone -n https://src.fedoraproject.org/rpms/python-cart.git /var/lib/mock/f45-build-29860-641/root/chroot_tmpdir/scmroot/python-cart
Cloning into '/var/lib/mock/f45-build-29860-641/root/chroot_tmpdir/scmroot/python-cart'...
$ git fetch origin 4b181700806d979fb03cffdd6f6704f9e6732b81:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-cart
 * [new ref]         4b181700806d979fb03cffdd6f6704f9e6732b81 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b18170 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild