$ git clone -n https://src.fedoraproject.org/rpms/R-pkgload /var/lib/mock/f41-build-side-1-3148573-40058/root/chroot_tmpdir/scmroot/R-pkgload
Cloning into '/var/lib/mock/f41-build-side-1-3148573-40058/root/chroot_tmpdir/scmroot/R-pkgload'...
$ git fetch origin cfe1aa4a75ff1b91de95921a9dcc3832f36f2d4d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pkgload
 * [new ref]         cfe1aa4a75ff1b91de95921a9dcc3832f36f2d4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfe1aa4 convert GPLv3 license to SPDX