$ git clone -n https://src.fedoraproject.org/rpms/rust-headers-core.git /var/lib/mock/f45-build-42291-792/root/chroot_tmpdir/scmroot/rust-headers-core
Cloning into '/var/lib/mock/f45-build-42291-792/root/chroot_tmpdir/scmroot/rust-headers-core'...
$ git fetch origin ad5ad07863ce713f576a1ecc57eb419bf103b3c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-headers-core
 * [new ref]         ad5ad07863ce713f576a1ecc57eb419bf103b3c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad5ad07 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild