$ git clone -n https://src.fedoraproject.org/rpms/R-gpx.git /var/lib/mock/f38-build-side-42-init-devel-1045191-29761/root/chroot_tmpdir/scmroot/R-gpx
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1045191-29761/root/chroot_tmpdir/scmroot/R-gpx'...
$ git fetch origin 9fe6f009c5cef984b628ec32531c0ba4e8e19985:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gpx
 * [new ref]         9fe6f009c5cef984b628ec32531c0ba4e8e19985 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fe6f00 Initial import (fedora#2179567).