$ git clone -n https://src.fedoraproject.org/rpms/R-pkgdown.git /var/lib/mock/f38-build-side-42-init-devel-1045226-29761/root/chroot_tmpdir/scmroot/R-pkgdown
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1045226-29761/root/chroot_tmpdir/scmroot/R-pkgdown'...
$ git fetch origin 04fcea15bb5ed2628df671998194f1ace56b9029:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pkgdown
 * [new ref]         04fcea15bb5ed2628df671998194f1ace56b9029 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04fcea1 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild