$ git clone -n https://src.fedoraproject.org/rpms/rust-ammonia.git /var/lib/mock/f40-build-2189732-51418/root/chroot_tmpdir/scmroot/rust-ammonia
Cloning into '/var/lib/mock/f40-build-2189732-51418/root/chroot_tmpdir/scmroot/rust-ammonia'...
$ git fetch origin e705fbf0ee6d8de068506a71f5b868a496dfcca8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ammonia
 * [new ref]         e705fbf0ee6d8de068506a71f5b868a496dfcca8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e705fbf Package re-import after unretirement