$ git clone -n https://src.fedoraproject.org/rpms/rust-format-bytes.git /var/lib/mock/f39-build-1446063-32656/root/chroot_tmpdir/scmroot/rust-format-bytes
Cloning into '/var/lib/mock/f39-build-1446063-32656/root/chroot_tmpdir/scmroot/rust-format-bytes'...
$ git fetch origin dae39692ffdffa834f3d65e278da58f007eb8919:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-format-bytes
 * [new ref]         dae39692ffdffa834f3d65e278da58f007eb8919 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dae3969 Regenerate with rust2rpm v24