$ git clone -n https://src.fedoraproject.org/rpms/R-disposables /var/lib/mock/f39-build-1581980-38102/root/chroot_tmpdir/scmroot/R-disposables
Cloning into '/var/lib/mock/f39-build-1581980-38102/root/chroot_tmpdir/scmroot/R-disposables'...
$ git fetch origin 8b772648eb4351ba0c5332108fa441c98320ed63:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-disposables
 * [new ref]         8b772648eb4351ba0c5332108fa441c98320ed63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b77264 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild