$ git clone -n https://src.fedoraproject.org/rpms/R-doMC.git /var/lib/mock/f39-build-1536738-36340/root/chroot_tmpdir/scmroot/R-doMC
Cloning into '/var/lib/mock/f39-build-1536738-36340/root/chroot_tmpdir/scmroot/R-doMC'...
$ git fetch origin bdfd31a194612d5cf01754e3cbde1039853becfc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-doMC
 * [new ref]         bdfd31a194612d5cf01754e3cbde1039853becfc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdfd31a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild