$ git clone -n https://src.fedoraproject.org/rpms/rust-gimli.git /var/lib/mock/f40-build-2156696-50918/root/chroot_tmpdir/scmroot/rust-gimli
Cloning into '/var/lib/mock/f40-build-2156696-50918/root/chroot_tmpdir/scmroot/rust-gimli'...
$ git fetch origin 3da35ceb48b8e574b8a53096523afb694dfa3e29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gimli
 * [new ref]         3da35ceb48b8e574b8a53096523afb694dfa3e29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3da35ce Update to version 0.28.1; Fixes RHBZ#2231677