$ git clone -n https://src.fedoraproject.org/rpms/R.git /var/lib/mock/f42-build-3222342-41041/root/chroot_tmpdir/scmroot/R
Cloning into '/var/lib/mock/f42-build-3222342-41041/root/chroot_tmpdir/scmroot/R'...
$ git fetch origin 5d83e4a9a8ef4b7747f28bb99d69d0f2a1aa2c6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R
 * [new ref]         5d83e4a9a8ef4b7747f28bb99d69d0f2a1aa2c6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d83e4a Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild