$ git clone -n https://src.fedoraproject.org/rpms/R-testit.git /var/lib/mock/f39-build-1535830-36251/root/chroot_tmpdir/scmroot/R-testit
Cloning into '/var/lib/mock/f39-build-1535830-36251/root/chroot_tmpdir/scmroot/R-testit'...
$ git fetch origin 1f80ee10d3791580d45476cdb9005db9fd853205:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-testit
 * [new ref]         1f80ee10d3791580d45476cdb9005db9fd853205 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f80ee1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild