$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-submodule.git /var/lib/mock/f39-build-1654055-40518/root/chroot_tmpdir/scmroot/rust-gix-submodule
Cloning into '/var/lib/mock/f39-build-1654055-40518/root/chroot_tmpdir/scmroot/rust-gix-submodule'...
$ git fetch origin 1bdaa2f81af128a7be2cec2c356fdf103a34c109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-submodule
 * [new ref]         1bdaa2f81af128a7be2cec2c356fdf103a34c109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bdaa2f Update to version 0.5.0