$ git clone -n https://src.fedoraproject.org/rpms/utop.git /var/lib/mock/f38-build-side-42-init-devel-593396-26152/root/chroot_tmpdir/scmroot/utop
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-593396-26152/root/chroot_tmpdir/scmroot/utop'...
$ git fetch origin 10b8a67d08c36ba0d6cac8803d70580b91ca3278:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/utop
 * [new ref]         10b8a67d08c36ba0d6cac8803d70580b91ca3278 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10b8a67 Rebuild OCaml packages for F38