/usr/lib/R/site-library/GenomeInfoDb/INDEX is in r-bioc-genomeinfodb 1.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16  | GenomeDescription-class
                        GenomeDescription objects
Seqinfo-class           Seqinfo objects
available.species       Returns a data.frame that lists the available
                        species strings and their taxonomy Ids.
fetchExtendedChromInfoFromUCSC
                        Fetching chromosomes info for some of the UCSC
                        genomes
rankSeqlevels           Assign sequence IDs to sequence names
seqinfo                 Accessing/modifying sequence information
seqlevels-wrappers      Convenience wrappers to the seqlevels() getter
                        and setter
seqlevelsStyle          Conveniently rename the seqlevels of an object
                        according to a given style
speciesMap              Species Mapper object and/or list of valid
                        taxonomy Ids
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