$ git clone -n https://src.fedoraproject.org/rpms/kf5-mailcommon.git /var/lib/mock/f39-build-1676979-40954/root/chroot_tmpdir/scmroot/kf5-mailcommon
Cloning into '/var/lib/mock/f39-build-1676979-40954/root/chroot_tmpdir/scmroot/kf5-mailcommon'...
$ git fetch origin 1462f7178ef748628aafa9df3b8a45296c1375ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-mailcommon
 * [new ref]         1462f7178ef748628aafa9df3b8a45296c1375ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1462f71 23.08.2