$ git clone -n https://src.fedoraproject.org/rpms/R-qpdf.git /var/lib/mock/f38-build-side-42-init-devel-903519-28616/root/chroot_tmpdir/scmroot/R-qpdf
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-903519-28616/root/chroot_tmpdir/scmroot/R-qpdf'...
$ git fetch origin 3cf839c64670e7f6011154a8e439d3b06e95f788:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-qpdf
 * [new ref]         3cf839c64670e7f6011154a8e439d3b06e95f788 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3cf839c Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild