$ git clone -n https://src.fedoraproject.org/rpms/rust-aes.git /var/lib/mock/f45-build-40036-767/root/chroot_tmpdir/scmroot/rust-aes
Cloning into '/var/lib/mock/f45-build-40036-767/root/chroot_tmpdir/scmroot/rust-aes'...
$ git fetch origin 4ff198eadc8aaf8874e71d7d0ede4ac913bb07b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-aes
 * [new ref]         4ff198eadc8aaf8874e71d7d0ede4ac913bb07b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ff198e Update to version 0.9.3; Fixes RHBZ#2525643