$ git clone -n https://src.fedoraproject.org/rpms/rust-print-positions.git /var/lib/mock/f38-build-side-43-rust-devel-1416535-31457/root/chroot_tmpdir/scmroot/rust-print-positions
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1416535-31457/root/chroot_tmpdir/scmroot/rust-print-positions'...
$ git fetch origin aba67bc64dfffcd19c2950dc6de05a4c8c2e7d83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-print-positions
 * [new ref]         aba67bc64dfffcd19c2950dc6de05a4c8c2e7d83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aba67bc Initial Fedora package