$ git clone -n https://src.fedoraproject.org/rpms/mathicgb.git /var/lib/mock/f45-build-18109-508/root/chroot_tmpdir/scmroot/mathicgb
Cloning into '/var/lib/mock/f45-build-18109-508/root/chroot_tmpdir/scmroot/mathicgb'...
$ git fetch origin 92fb4a1af73a2416e2e9693ad1cdb5bdfeaf5ffe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mathicgb
 * [new ref]         92fb4a1af73a2416e2e9693ad1cdb5bdfeaf5ffe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 92fb4a1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild