$ git clone -n https://src.fedoraproject.org/rpms/kmail.git /var/lib/mock/f39-build-2133697-50802/root/chroot_tmpdir/scmroot/kmail
Cloning into '/var/lib/mock/f39-build-2133697-50802/root/chroot_tmpdir/scmroot/kmail'...
$ git fetch origin 134f172d15406fed96f69949e050852a810c193a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kmail
 * [new ref]         134f172d15406fed96f69949e050852a810c193a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 134f172 23.08.4