$ git clone -n https://src.fedoraproject.org/rpms/rust-heapless.git /var/lib/mock/f45-build-42300-792/root/chroot_tmpdir/scmroot/rust-heapless
Cloning into '/var/lib/mock/f45-build-42300-792/root/chroot_tmpdir/scmroot/rust-heapless'...
$ git fetch origin ceb3e050d49d3592e843b16f2610f7c29cfbba2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-heapless
 * [new ref]         ceb3e050d49d3592e843b16f2610f7c29cfbba2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ceb3e05 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild