$ git clone -n https://src.fedoraproject.org/rpms/ginac.git /var/lib/mock/f45-build-11059-426/root/chroot_tmpdir/scmroot/ginac
Cloning into '/var/lib/mock/f45-build-11059-426/root/chroot_tmpdir/scmroot/ginac'...
$ git fetch origin 90e99dfdce38180ee51d732c0c1c2630aaef5fa9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ginac
 * [new ref]         90e99dfdce38180ee51d732c0c1c2630aaef5fa9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90e99df Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild