$ git clone -n https://src.fedoraproject.org/rpms/R-corpus.git /var/lib/mock/f39-build-1600280-38536/root/chroot_tmpdir/scmroot/R-corpus
Cloning into '/var/lib/mock/f39-build-1600280-38536/root/chroot_tmpdir/scmroot/R-corpus'...
$ git fetch origin d7b18d30e797e83576790a41039acdfdbe8dd1af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-corpus
 * [new ref]         d7b18d30e797e83576790a41039acdfdbe8dd1af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7b18d3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild