$ git clone -n https://src.fedoraproject.org/rpms/R-sourcetools.git /var/lib/mock/f40-build-2136666-50815/root/chroot_tmpdir/scmroot/R-sourcetools
Cloning into '/var/lib/mock/f40-build-2136666-50815/root/chroot_tmpdir/scmroot/R-sourcetools'...
$ git fetch origin f1d3b413b3339832d4ecfa350d9b68c3bdb05c6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sourcetools
 * [new ref]         f1d3b413b3339832d4ecfa350d9b68c3bdb05c6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1d3b41 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild