$ git clone -n https://src.fedoraproject.org/rpms/R-data.table.git /var/lib/mock/f38-build-side-42-init-devel-1049403-29762/root/chroot_tmpdir/scmroot/R-data.table
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1049403-29762/root/chroot_tmpdir/scmroot/R-data.table'...
$ git fetch origin eba02cdaf1a9fe9241335fef8ab937c19ed943bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-data.table
 * [new ref]         eba02cdaf1a9fe9241335fef8ab937c19ed943bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eba02cd Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild