$ git clone -n https://src.fedoraproject.org/rpms/kf5-mailcommon.git /var/lib/mock/f39-test-2571259-62244/root/chroot_tmpdir/scmroot/kf5-mailcommon
Cloning into '/var/lib/mock/f39-test-2571259-62244/root/chroot_tmpdir/scmroot/kf5-mailcommon'...
$ git fetch origin d178134d4cbbcae034e920490630329d72e6f4c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-mailcommon
 * [new ref]         d178134d4cbbcae034e920490630329d72e6f4c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d178134 23.08.5