$ git clone -n https://src.fedoraproject.org/rpms/libnss-mysql.git /var/lib/mock/f45-build-16800-491/root/chroot_tmpdir/scmroot/libnss-mysql
Cloning into '/var/lib/mock/f45-build-16800-491/root/chroot_tmpdir/scmroot/libnss-mysql'...
$ git fetch origin 74e5ae3544dd535a78bd5fcbc624594250699ad5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnss-mysql
 * [new ref]         74e5ae3544dd535a78bd5fcbc624594250699ad5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74e5ae3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild