$ git clone -n https://src.fedoraproject.org/rpms/mbox-importer.git /var/lib/mock/f40-build-774641-127716/root/chroot_tmpdir/scmroot/mbox-importer
Cloning into '/var/lib/mock/f40-build-774641-127716/root/chroot_tmpdir/scmroot/mbox-importer'...
$ git fetch origin 0392b62d9af12fe37e151f3318a834d3eed2c558:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mbox-importer
 * [new ref]         0392b62d9af12fe37e151f3318a834d3eed2c558 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0392b62 24.01.90