$ git clone -n https://src.fedoraproject.org/rpms/mpsolve.git /var/lib/mock/f45-build-19210-543/root/chroot_tmpdir/scmroot/mpsolve
Cloning into '/var/lib/mock/f45-build-19210-543/root/chroot_tmpdir/scmroot/mpsolve'...
$ git fetch origin af40a6debfd287f1d81a04c6b84210b66879bc4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mpsolve
 * [new ref]         af40a6debfd287f1d81a04c6b84210b66879bc4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af40a6d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild