$ git clone -n https://src.fedoraproject.org/rpms/rust-varbincode.git /var/lib/mock/f38-build-side-43-rust-devel-1412408-31443/root/chroot_tmpdir/scmroot/rust-varbincode
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1412408-31443/root/chroot_tmpdir/scmroot/rust-varbincode'...
$ git fetch origin f171a26f6db1a9f02d2a5a7242b669b20dabe931:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-varbincode
 * [new ref]         f171a26f6db1a9f02d2a5a7242b669b20dabe931 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f171a26 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild