$ git clone -n https://src.fedoraproject.org/rpms/rust-enum-map.git /var/lib/mock/f38-build-side-43-rust-devel-1397779-31053/root/chroot_tmpdir/scmroot/rust-enum-map
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397779-31053/root/chroot_tmpdir/scmroot/rust-enum-map'...
$ git fetch origin 4deef9e1c8c300ad31da0fa2418838b58cabc5d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-enum-map
 * [new ref]         4deef9e1c8c300ad31da0fa2418838b58cabc5d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4deef9e Update to version 2.6.3; Fixes RHBZ#2237955