$ git clone -n https://src.fedoraproject.org/rpms/jcommon.git /var/lib/mock/f38-build-side-42-init-devel-747040-27660/root/chroot_tmpdir/scmroot/jcommon
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-747040-27660/root/chroot_tmpdir/scmroot/jcommon'...
$ git fetch origin bdb363ff1890fa01c2ecb40ea8cd7f77beeadd2a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jcommon
 * [new ref]         bdb363ff1890fa01c2ecb40ea8cd7f77beeadd2a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdb363f Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild