$ git clone -n https://src.fedoraproject.org/rpms/python-multiecho.git /var/lib/mock/f39-build-1617656-38655/root/chroot_tmpdir/scmroot/python-multiecho
Cloning into '/var/lib/mock/f39-build-1617656-38655/root/chroot_tmpdir/scmroot/python-multiecho'...
$ git fetch origin fa8008b6322bb51802fc6a551c67cbb7b6d7652c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-multiecho
 * [new ref]         fa8008b6322bb51802fc6a551c67cbb7b6d7652c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa8008b Update to 0.29 (close RHBZ#2234817)