$ git clone -n https://src.fedoraproject.org/rpms/mythes-hu.git /var/lib/mock/f45-build-19410-549/root/chroot_tmpdir/scmroot/mythes-hu
Cloning into '/var/lib/mock/f45-build-19410-549/root/chroot_tmpdir/scmroot/mythes-hu'...
$ git fetch origin ce05b07445186790a9a7529f918d86699fae10e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mythes-hu
 * [new ref]         ce05b07445186790a9a7529f918d86699fae10e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce05b07 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild