$ git clone -n https://src.fedoraproject.org/rpms/nano.git /var/lib/mock/f41-build-side-1-2821407-33215/root/chroot_tmpdir/scmroot/nano
Cloning into '/var/lib/mock/f41-build-side-1-2821407-33215/root/chroot_tmpdir/scmroot/nano'...
$ git fetch origin cdde5d559c99e8c9565a9432db98853e720d10db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nano
 * [new ref]         cdde5d559c99e8c9565a9432db98853e720d10db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdde5d5 rebase to latest upstream release