$ git clone -n https://src.fedoraproject.org/rpms/R-withr.git /var/lib/mock/f40-build-2177075-51093/root/chroot_tmpdir/scmroot/R-withr
Cloning into '/var/lib/mock/f40-build-2177075-51093/root/chroot_tmpdir/scmroot/R-withr'...
$ git fetch origin 55f089da4563b28faabaa81796cf699069426e50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-withr
 * [new ref]         55f089da4563b28faabaa81796cf699069426e50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 55f089d Update to 2.5.2