$ git clone -n https://src.fedoraproject.org/rpms/fastapi-new.git /var/lib/mock/f45-build-8689-394/root/chroot_tmpdir/scmroot/fastapi-new
Cloning into '/var/lib/mock/f45-build-8689-394/root/chroot_tmpdir/scmroot/fastapi-new'...
$ git fetch origin 7c6d0651cd02da85b5f2fe1369b1fd2609c29e1f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fastapi-new
 * [new ref]         7c6d0651cd02da85b5f2fe1369b1fd2609c29e1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c6d065 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild