$ git clone -n https://src.fedoraproject.org/rpms/R-lubridate.git /var/lib/mock/f41-build-side-1-2988892-35966/root/chroot_tmpdir/scmroot/R-lubridate
Cloning into '/var/lib/mock/f41-build-side-1-2988892-35966/root/chroot_tmpdir/scmroot/R-lubridate'...
$ git fetch origin d2428f69fbfdda47bf5dd9a64cdc42023423d909:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lubridate
 * [new ref]         d2428f69fbfdda47bf5dd9a64cdc42023423d909 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2428f6 Update to latest version (#2240960)