$ git clone -n https://src.fedoraproject.org/rpms/rust-bitfield0.14.git /var/lib/mock/f45-build-40460-772/root/chroot_tmpdir/scmroot/rust-bitfield0.14
Cloning into '/var/lib/mock/f45-build-40460-772/root/chroot_tmpdir/scmroot/rust-bitfield0.14'...
$ git fetch origin f10fc15d81bcb2d04c50688297552faad93a7e9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bitfield0.14
 * [new ref]         f10fc15d81bcb2d04c50688297552faad93a7e9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f10fc15 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild