$ git clone -n https://src.fedoraproject.org/rpms/rust-mac_address.git /var/lib/mock/f45-build-43102-800/root/chroot_tmpdir/scmroot/rust-mac_address
Cloning into '/var/lib/mock/f45-build-43102-800/root/chroot_tmpdir/scmroot/rust-mac_address'...
$ git fetch origin 71ac08e7513f108099d09f9af51bdcaf114b4a06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mac_address
 * [new ref]         71ac08e7513f108099d09f9af51bdcaf114b4a06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71ac08e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild