$ git clone -n https://src.fedoraproject.org/rpms/rust-temp-env.git /var/lib/mock/f40-build-2063944-49167/root/chroot_tmpdir/scmroot/rust-temp-env
Cloning into '/var/lib/mock/f40-build-2063944-49167/root/chroot_tmpdir/scmroot/rust-temp-env'...
$ git fetch origin 8ea2b6ddd3394d2254544481df49f6de8268d1d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-temp-env
 * [new ref]         8ea2b6ddd3394d2254544481df49f6de8268d1d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ea2b6d Update to version 0.3.6; Fixes RHBZ#2240446