$ git clone -n https://src.fedoraproject.org/rpms/kf5-mailcommon.git /var/lib/mock/f39-build-1981272-43342/root/chroot_tmpdir/scmroot/kf5-mailcommon
Cloning into '/var/lib/mock/f39-build-1981272-43342/root/chroot_tmpdir/scmroot/kf5-mailcommon'...
$ git fetch origin e5a1baed4c8bbf5cbe2bb0271f95cbf746a3bb4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-mailcommon
 * [new ref]         e5a1baed4c8bbf5cbe2bb0271f95cbf746a3bb4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5a1bae 23.08.3