$ git clone -n https://src.fedoraproject.org/rpms/rust-des.git /var/lib/mock/f45-build-41249-780/root/chroot_tmpdir/scmroot/rust-des
Cloning into '/var/lib/mock/f45-build-41249-780/root/chroot_tmpdir/scmroot/rust-des'...
$ git fetch origin 81e797bf95307ee915ad590af147febf568d0855:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-des
 * [new ref]         81e797bf95307ee915ad590af147febf568d0855 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81e797b Update to version 0.9.0; Fixes RHBZ#2457308