$ git clone -n https://src.fedoraproject.org/rpms/R-mockr.git /var/lib/mock/f40-build-2268366-54740/root/chroot_tmpdir/scmroot/R-mockr
Cloning into '/var/lib/mock/f40-build-2268366-54740/root/chroot_tmpdir/scmroot/R-mockr'...
$ git fetch origin ca2720d436d6e538c8f082c1e5a1461dc1b42511:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-mockr
 * [new ref]         ca2720d436d6e538c8f082c1e5a1461dc1b42511 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca2720d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild