$ git clone -n https://src.fedoraproject.org/rpms/mbox-importer.git /var/lib/mock/f39-build-2103706-50561/root/chroot_tmpdir/scmroot/mbox-importer
Cloning into '/var/lib/mock/f39-build-2103706-50561/root/chroot_tmpdir/scmroot/mbox-importer'...
$ git fetch origin 883c0c79711d70c1228c8313c39b8a3e1a4c4656:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mbox-importer
 * [new ref]         883c0c79711d70c1228c8313c39b8a3e1a4c4656 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 883c0c7 23.08.4