$ git clone -n https://src.fedoraproject.org/rpms/rust-block-padding0.2.git /var/lib/mock/f45-build-40498-772/root/chroot_tmpdir/scmroot/rust-block-padding0.2
Cloning into '/var/lib/mock/f45-build-40498-772/root/chroot_tmpdir/scmroot/rust-block-padding0.2'...
$ git fetch origin d12f171f2b3f6afd60d5a67004f2f5de6947809b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-block-padding0.2
 * [new ref]         d12f171f2b3f6afd60d5a67004f2f5de6947809b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d12f171 Regenerate with rust2rpm v28