$ git clone -n https://src.fedoraproject.org/rpms/R-pkgdown.git /var/lib/mock/f40-build-2285506-55678/root/chroot_tmpdir/scmroot/R-pkgdown
Cloning into '/var/lib/mock/f40-build-2285506-55678/root/chroot_tmpdir/scmroot/R-pkgdown'...
$ git fetch origin 6a6a71cc29035249853b39415b3389137b3f0fae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pkgdown
 * [new ref]         6a6a71cc29035249853b39415b3389137b3f0fae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a6a71c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild