$ git clone -n https://src.fedoraproject.org/rpms/kf5-mailcommon.git /var/lib/mock/f38-build-722232-98749/root/chroot_tmpdir/scmroot/kf5-mailcommon
Cloning into '/var/lib/mock/f38-build-722232-98749/root/chroot_tmpdir/scmroot/kf5-mailcommon'...
$ git fetch origin e18fd2e649ae9aa37b6a8e120980ff61338de2d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-mailcommon
 * [new ref]         e18fd2e649ae9aa37b6a8e120980ff61338de2d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e18fd2e 23.04.1