$ git clone -n https://src.fedoraproject.org/rpms/R-pkgdown.git /var/lib/mock/f40-build-2107580-50596/root/chroot_tmpdir/scmroot/R-pkgdown
Cloning into '/var/lib/mock/f40-build-2107580-50596/root/chroot_tmpdir/scmroot/R-pkgdown'...
$ git fetch origin cf307878b556fb8f5662f0ce4a9ce3933567818a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pkgdown
 * [new ref]         cf307878b556fb8f5662f0ce4a9ce3933567818a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf30787 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild