$ git clone -n https://src.fedoraproject.org/rpms/rust-btrd.git /var/lib/mock/f41-build-846645-163162/root/chroot_tmpdir/scmroot/rust-btrd
Cloning into '/var/lib/mock/f41-build-846645-163162/root/chroot_tmpdir/scmroot/rust-btrd'...
$ git fetch origin 499aa6122da82078b7b63ed1ae4f364ab9a48113:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-btrd
 * [new ref]         499aa6122da82078b7b63ed1ae4f364ab9a48113 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 499aa61 Fix unaddressed FIXME and clarify license