$ git clone -n https://src.fedoraproject.org/rpms/R-blob.git /var/lib/mock/f40-build-2339721-59671/root/chroot_tmpdir/scmroot/R-blob
Cloning into '/var/lib/mock/f40-build-2339721-59671/root/chroot_tmpdir/scmroot/R-blob'...
$ git fetch origin 1f67942fbab1f49dea96b074a7d28829d372f42a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-blob
 * [new ref]         1f67942fbab1f49dea96b074a7d28829d372f42a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f67942 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild