$ git clone -n https://src.fedoraproject.org/rpms/rust-num-prime.git /var/lib/mock/f45-build-43436-803/root/chroot_tmpdir/scmroot/rust-num-prime
Cloning into '/var/lib/mock/f45-build-43436-803/root/chroot_tmpdir/scmroot/rust-num-prime'...
$ git fetch origin 3394532a9eb53d07d71b476f38abff26fbf53661:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-prime
 * [new ref]         3394532a9eb53d07d71b476f38abff26fbf53661 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3394532 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild