$ git clone -n https://src.fedoraproject.org/rpms/rust-mayheap.git /var/lib/mock/f45-build-43149-800/root/chroot_tmpdir/scmroot/rust-mayheap
Cloning into '/var/lib/mock/f45-build-43149-800/root/chroot_tmpdir/scmroot/rust-mayheap'...
$ git fetch origin c043e0262451f1d80ea1bbd90fa3ceff0e76a920:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mayheap
 * [new ref]         c043e0262451f1d80ea1bbd90fa3ceff0e76a920 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c043e02 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild