$ git clone -n https://src.fedoraproject.org/rpms/R-RM2.git /var/lib/mock/f45-build-47033-864/root/chroot_tmpdir/scmroot/R-RM2
Cloning into '/var/lib/mock/f45-build-47033-864/root/chroot_tmpdir/scmroot/R-RM2'...
$ git fetch origin 8634d700c71a55f19495fb3d078278915abab1a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RM2
 * [new ref]         8634d700c71a55f19495fb3d078278915abab1a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8634d70 Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild