$ git clone -n https://src.fedoraproject.org/rpms/gnucash.git /var/lib/mock/f42-build-side-1-3583257-46888/root/chroot_tmpdir/scmroot/gnucash
Cloning into '/var/lib/mock/f42-build-side-1-3583257-46888/root/chroot_tmpdir/scmroot/gnucash'...
$ git fetch origin 35b5340e32b9886ce4293be532bf9f5f8733abcf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnucash
 * [new ref]         35b5340e32b9886ce4293be532bf9f5f8733abcf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35b5340 5.12