$ git clone -n https://src.fedoraproject.org/rpms/dovecot.git /var/lib/mock/f41-build-side-1-2893016-34611/root/chroot_tmpdir/scmroot/dovecot
Cloning into '/var/lib/mock/f41-build-side-1-2893016-34611/root/chroot_tmpdir/scmroot/dovecot'...
$ git fetch origin 6f7ee4008d5c89c19de6520d72491c3d69c6538e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dovecot
 * [new ref]         6f7ee4008d5c89c19de6520d72491c3d69c6538e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f7ee40 updated to 2.3.21.1(2304907)