$ git clone -n https://src.fedoraproject.org/rpms/rust-opener.git /var/lib/mock/f40-build-2130601-50790/root/chroot_tmpdir/scmroot/rust-opener
Cloning into '/var/lib/mock/f40-build-2130601-50790/root/chroot_tmpdir/scmroot/rust-opener'...
$ git fetch origin 74a1242315b965389ea5428e502ddd7315b0d795:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-opener
 * [new ref]         74a1242315b965389ea5428e502ddd7315b0d795 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74a1242 Update to version 0.6.1; Fixes RHBZ#2165250