$ git clone -n https://src.fedoraproject.org/rpms/rust-unarray.git /var/lib/mock/f45-build-45853-828/root/chroot_tmpdir/scmroot/rust-unarray
Cloning into '/var/lib/mock/f45-build-45853-828/root/chroot_tmpdir/scmroot/rust-unarray'...
$ git fetch origin 2dd7e668be7b379a031661aa3948ad2ebb9e5aaa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unarray
 * [new ref]         2dd7e668be7b379a031661aa3948ad2ebb9e5aaa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dd7e66 Regenerate with rust2rpm v28