$ git clone -n https://src.fedoraproject.org/rpms/erlang-merge_index.git /var/lib/mock/f38-build-side-42-init-devel-622927-26358/root/chroot_tmpdir/scmroot/erlang-merge_index
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-622927-26358/root/chroot_tmpdir/scmroot/erlang-merge_index'...
$ git fetch origin 3da7f953e20f06d5952717752da2f33ce4fd9a1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-merge_index
 * [new ref]         3da7f953e20f06d5952717752da2f33ce4fd9a1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3da7f95 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild