$ git clone -n https://src.fedoraproject.org/rpms/rust-fixedbitset.git /var/lib/mock/f38-build-side-43-rust-devel-1413159-31443/root/chroot_tmpdir/scmroot/rust-fixedbitset
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1413159-31443/root/chroot_tmpdir/scmroot/rust-fixedbitset'...
$ git fetch origin a621b041146cc25cfc388296a1d57df0c7eacc27:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fixedbitset
 * [new ref]         a621b041146cc25cfc388296a1d57df0c7eacc27 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a621b04 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild