$ git clone -n https://src.fedoraproject.org/rpms/rust-bitvec_helpers.git /var/lib/mock/f45-build-40466-772/root/chroot_tmpdir/scmroot/rust-bitvec_helpers
Cloning into '/var/lib/mock/f45-build-40466-772/root/chroot_tmpdir/scmroot/rust-bitvec_helpers'...
$ git fetch origin fa764f9b8fb9a10dbf787aa3768dcc0712563d26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bitvec_helpers
 * [new ref]         fa764f9b8fb9a10dbf787aa3768dcc0712563d26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa764f9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild