$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-submodule.git /var/lib/mock/f45-build-42065-788/root/chroot_tmpdir/scmroot/rust-gix-submodule
Cloning into '/var/lib/mock/f45-build-42065-788/root/chroot_tmpdir/scmroot/rust-gix-submodule'...
$ git fetch origin b205b4d3f370ea3e699752692cf5592ea71adcd1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-submodule
 * [new ref]         b205b4d3f370ea3e699752692cf5592ea71adcd1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b205b4d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild