$ git clone -n https://src.fedoraproject.org/rpms/R-simmer.git /var/lib/mock/f40-build-789218-135684/root/chroot_tmpdir/scmroot/R-simmer
Cloning into '/var/lib/mock/f40-build-789218-135684/root/chroot_tmpdir/scmroot/R-simmer'...
$ git fetch origin 86da64c3412583ae76d4cc01dbdcd5c6ad9a5009:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-simmer
 * [new ref]         86da64c3412583ae76d4cc01dbdcd5c6ad9a5009 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86da64c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild