$ git clone -n https://src.fedoraproject.org/rpms/demorse.git /var/lib/mock/f45-build-7420-363/root/chroot_tmpdir/scmroot/demorse
Cloning into '/var/lib/mock/f45-build-7420-363/root/chroot_tmpdir/scmroot/demorse'...
$ git fetch origin 7cea8eb9b2c5c46c6e7e6fc56f177d38d0e8b736:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/demorse
 * [new ref]         7cea8eb9b2c5c46c6e7e6fc56f177d38d0e8b736 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cea8eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild