$ git clone -n https://src.fedoraproject.org/rpms/R-knitr.git /var/lib/mock/f40-build-2321699-58605/root/chroot_tmpdir/scmroot/R-knitr
Cloning into '/var/lib/mock/f40-build-2321699-58605/root/chroot_tmpdir/scmroot/R-knitr'...
$ git fetch origin bed5e189c2d7204d4eddfb846b9245a3c70ccfed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-knitr
 * [new ref]         bed5e189c2d7204d4eddfb846b9245a3c70ccfed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bed5e18 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild