$ git clone -n https://src.fedoraproject.org/rpms/mbox-importer.git /var/lib/mock/f42-build-864148-172187/root/chroot_tmpdir/scmroot/mbox-importer
Cloning into '/var/lib/mock/f42-build-864148-172187/root/chroot_tmpdir/scmroot/mbox-importer'...
$ git fetch origin 24690327900b73a4d2171e1f11cf5771991a6365:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mbox-importer
 * [new ref]         24690327900b73a4d2171e1f11cf5771991a6365 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2469032 24.12.0