Package versions missing in search output

[brettsheffield]

Package version is displaying blank for packages librecast, lcrq and lcsync which prevents these packages from displaying in repology.

See https://search.nixos.org/packages?channel=unstable&from=0&size=50&sort=relevance&type=packages&query=librecast

See also repology ticket https://github.com/repology/repology-updater/issues/1402

I know little about either repology or nixpgs, but looking at the API output, I think the problem may be with "package_pversion": ""

{
    "took": 93,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 3,
            "relation": "eq"
        },
        "max_score": null,
        "hits": [
            {
                "_index": "nixos-42-unstable-f1010e0469db743d14519a1efd37e23f8513d714",
                "_type": "_doc",
                "_id": "aVWeYY8BMU8RZ4DXCpuu",
                "_score": 94.32698,
                "_source": {
                    "type": "package",
                    "package_attr_name": "librecast",
                    "package_attr_set": "No package set",
                    "package_pname": "librecast",
                    "package_pversion": "",
                    "package_platforms": [
                        "riscv32-linux",
                        "s390-linux",
                        "microblazeel-linux",
                        "mips64el-linux",
                        "mipsel-linux",
                        "s390x-linux",
                        "m68k-linux",
                        "x86_64-linux",
                        "armv6l-linux",
                        "mips64-linux",
                        "armv5tel-linux",
                        "mips-linux",
                        "riscv64-linux",
                        "aarch64-linux",
                        "loongarch64-linux",
                        "powerpc64-linux",
                        "armv7l-linux",
                        "microblaze-linux",
                        "powerpc64le-linux",
                        "armv7a-linux",
                        "i686-linux"
                    ],
                    "package_outputs": [
                        "out"
                    ],
                    "package_default_output": "out",
                    "package_programs": [],
                    "package_license": [
                        {
                            "url": "https://spdx.org/licenses/GPL-2.0.html",
                            "fullName": "GNU General Public License v2.0"
                        },
                        {
                            "url": "https://spdx.org/licenses/GPL-3.0.html",
                            "fullName": "GNU General Public License v3.0"
                        }
                    ],
                    "package_license_set": [
                        "GNU General Public License v2.0",
                        "GNU General Public License v3.0"
                    ],
                    "package_maintainers": [
                        {
                            "name": "Albert Chae",
                            "github": "albertchae",
                            "email": null
                        },
                        {
                            "name": "Anish Lakhwara",
                            "github": "Chickensoupwithrice",
                            "email": null
                        },
                        {
                            "name": "Dominic Mills",
                            "github": "DMills27",
                            "email": null
                        },
                        {
                            "name": "Jason Odoom",
                            "github": "jasonodoom",
                            "email": "jasonodoom@riseup.net"
                        },
                        {
                            "name": "Jack Leightcap",
                            "github": "jleightcap",
                            "email": "jack@leightcap.com"
                        }
                    ],
                    "package_maintainers_set": [
                        "Albert Chae",
                        "Anish Lakhwara",
                        "Dominic Mills",
                        "Jason Odoom",
                        "Jack Leightcap"
                    ],
                    "package_description": "IPv6 multicast library",
                    "package_longDescription": null,
                    "package_hydra": null,
                    "package_system": "x86_64-linux",
                    "package_homepage": [
                        "https://librecast.net/librecast.html"
                    ],
                    "package_position": "pkgs/development/libraries/librecast/default.nix:24"
                },
                "sort": [
                    94.32698,
                    "librecast",
                    ""
                ],
                "matched_queries": [
                    "multi_match_librecast",
                    "filter_packages"
                ]
            },
            {
                "_index": "nixos-42-unstable-f1010e0469db743d14519a1efd37e23f8513d714",
                "_type": "_doc",
                "_id": "dM-dYY8BzICT7E5l9OfT",
                "_score": 16.595491,
                "_source": {
                    "type": "package",
                    "package_attr_name": "lcrq",
                    "package_attr_set": "No package set",
                    "package_pname": "lcrq",
                    "package_pversion": "",
                    "package_platforms": [
                        "x86_64-netbsd",
                        "m68k-netbsd",
                        "armv6l-netbsd",
                        "armv6l-linux",
                        "riscv32-netbsd",
                        "armv7a-darwin",
                        "aarch64-netbsd",
                        "microblazeel-linux",
                        "i686-netbsd",
                        "s390-linux",
                        "i686-openbsd",
                        "powerpc64le-linux",
                        "loongarch64-linux",
                        "mips64el-linux",
                        "x86_64-darwin",
                        "powerpc-netbsd",
                        "x86_64-openbsd",
                        "m68k-linux",
                        "x86_64-linux",
                        "riscv64-linux",
                        "i686-linux",
                        "armv7l-linux",
                        "armv7l-netbsd",
                        "armv7a-linux",
                        "mips-linux",
                        "aarch64-darwin",
                        "mips64-linux",
                        "mipsel-linux",
                        "powerpc64-linux",
                        "s390x-linux",
                        "x86_64-solaris",
                        "i686-freebsd",
                        "x86_64-freebsd",
                        "armv5tel-linux",
                        "riscv32-linux",
                        "riscv64-netbsd",
                        "aarch64-linux",
                        "i686-cygwin",
                        "armv7a-netbsd",
                        "mipsel-netbsd",
                        "x86_64-cygwin",
                        "x86_64-redox",
                        "i686-darwin",
                        "microblaze-linux"
                    ],
                    "package_outputs": [
                        "out"
                    ],
                    "package_default_output": "out",
                    "package_programs": [],
                    "package_license": [
                        {
                            "url": "https://spdx.org/licenses/GPL-2.0.html",
                            "fullName": "GNU General Public License v2.0"
                        },
                        {
                            "url": "https://spdx.org/licenses/GPL-3.0.html",
                            "fullName": "GNU General Public License v3.0"
                        }
                    ],
                    "package_license_set": [
                        "GNU General Public License v2.0",
                        "GNU General Public License v3.0"
                    ],
                    "package_maintainers": [
                        {
                            "name": "Albert Chae",
                            "github": "albertchae",
                            "email": null
                        },
                        {
                            "name": "Anish Lakhwara",
                            "github": "Chickensoupwithrice",
                            "email": null
                        },
                        {
                            "name": "Dominic Mills",
                            "github": "DMills27",
                            "email": null
                        },
                        {
                            "name": "Jason Odoom",
                            "github": "jasonodoom",
                            "email": "jasonodoom@riseup.net"
                        },
                        {
                            "name": "Jack Leightcap",
                            "github": "jleightcap",
                            "email": "jack@leightcap.com"
                        }
                    ],
                    "package_maintainers_set": [
                        "Albert Chae",
                        "Anish Lakhwara",
                        "Dominic Mills",
                        "Jason Odoom",
                        "Jack Leightcap"
                    ],
                    "package_description": "Librecast RaptorQ library.",
                    "package_longDescription": null,
                    "package_hydra": null,
                    "package_system": "x86_64-linux",
                    "package_homepage": [
                        "https://librecast.net/lcrq.html"
                    ],
                    "package_position": "pkgs/development/libraries/lcrq/default.nix:22"
                },
                "sort": [
                    16.595491,
                    "lcrq",
                    ""
                ],
                "matched_queries": [
                    "multi_match_librecast",
                    "filter_packages"
                ]
            },
            {
                "_index": "nixos-42-unstable-f1010e0469db743d14519a1efd37e23f8513d714",
                "_type": "_doc",
                "_id": "LdCeYY8BzICT7E5lNglJ",
                "_score": 15.243757,
                "_source": {
                    "type": "package",
                    "package_attr_name": "lcsync",
                    "package_attr_set": "No package set",
                    "package_pname": "lcsync",
                    "package_pversion": "",
                    "package_platforms": [
                        "powerpc64-linux",
                        "armv6l-linux",
                        "mips64-linux",
                        "x86_64-linux",
                        "aarch64-linux",
                        "armv7l-linux",
                        "armv5tel-linux",
                        "mips64el-linux",
                        "s390x-linux",
                        "mips-linux",
                        "loongarch64-linux",
                        "microblaze-linux",
                        "riscv32-linux",
                        "i686-linux",
                        "m68k-linux",
                        "armv7a-linux",
                        "powerpc64le-linux",
                        "s390-linux",
                        "microblazeel-linux",
                        "mipsel-linux",
                        "riscv64-linux"
                    ],
                    "package_outputs": [
                        "out"
                    ],
                    "package_default_output": "out",
                    "package_programs": [
                        "lcsync"
                    ],
                    "package_license": [
                        {
                            "url": "https://spdx.org/licenses/GPL-2.0.html",
                            "fullName": "GNU General Public License v2.0"
                        },
                        {
                            "url": "https://spdx.org/licenses/GPL-3.0.html",
                            "fullName": "GNU General Public License v3.0"
                        }
                    ],
                    "package_license_set": [
                        "GNU General Public License v2.0",
                        "GNU General Public License v3.0"
                    ],
                    "package_maintainers": [
                        {
                            "name": "Albert Chae",
                            "github": "albertchae",
                            "email": null
                        },
                        {
                            "name": "Anish Lakhwara",
                            "github": "Chickensoupwithrice",
                            "email": null
                        },
                        {
                            "name": "Dominic Mills",
                            "github": "DMills27",
                            "email": null
                        },
                        {
                            "name": "Jason Odoom",
                            "github": "jasonodoom",
                            "email": "jasonodoom@riseup.net"
                        },
                        {
                            "name": "Jack Leightcap",
                            "github": "jleightcap",
                            "email": "jack@leightcap.com"
                        }
                    ],
                    "package_maintainers_set": [
                        "Albert Chae",
                        "Anish Lakhwara",
                        "Dominic Mills",
                        "Jason Odoom",
                        "Jack Leightcap"
                    ],
                    "package_description": "Librecast File and Syncing Tool",
                    "package_longDescription": null,
                    "package_hydra": null,
                    "package_system": "x86_64-linux",
                    "package_homepage": [
                        "https://librecast.net/lcsync.html"
                    ],
                    "package_position": "pkgs/applications/networking/sync/lcsync/default.nix:27"
                },
                "sort": [
                    15.243757,
                    "lcsync",
                    ""
                ],
                "matched_queries": [
                    "multi_match_librecast",
                    "filter_packages"
                ]
            }
        ]
    },
    "aggregations": {
        "all": {
            "doc_count": 133949,
            "package_attr_set": {
                "doc_count_error_upper_bound": 0,
                "sum_other_doc_count": 6520,
                "buckets": [
                    {
                        "key": "rPackages",
                        "doc_count": 27369
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                    {
                        "key": "No package set",
                        "doc_count": 18809
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                    {
                        "key": "haskellPackages",
                        "doc_count": 17962
                    },
                    {
                        "key": "python311Packages",
                        "doc_count": 8247
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                    {
                        "key": "python312Packages",
                        "doc_count": 8247
                    },
                    {
                        "key": "emacsPackages",
                        "doc_count": 6104
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                        "key": "sbclPackages",
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                    {
                        "key": "texlivePackages",
                        "doc_count": 4388
                    },
                    {
                        "key": "linuxKernel",
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                    {
                        "key": "perl536Packages",
                        "doc_count": 1902
                    },
                    {
                        "key": "perl538Packages",
                        "doc_count": 1897
                    },
                    {
                        "key": "vimPlugins",
                        "doc_count": 1783
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                    {
                        "key": "ocamlPackages",
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                    },
                    {
                        "key": "home-assistant-component-tests",
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                    {
                        "key": "gnomeExtensions",
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                        "key": "chickenPackages_5",
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                        "key": "libsForQt5",
                        "doc_count": 508
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                        "key": "kdePackages",
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                        "key": "rubyPackages_3_2",
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                    {
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                        "key": "Bobby Rong",
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                        "key": "Anderson Torres",
                        "doc_count": 512
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                        "key": "Lukas Epple",
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                    }
                ]
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                    },
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                        "key": "Artistic License 1.0",
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                    },
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                        "doc_count": 1075
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                        "key": "Unfree",
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                    {
                        "key": "GNU Lesser General Public License v3.0 or later",
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                        "key": "MIT",
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                    "key": "GNU General Public License v2.0",
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                {
                    "key": "GNU General Public License v3.0",
                    "doc_count": 3
                }
            ]
        }
    }
}

[jopejoe1]

Those 3 packages can be fixed by replacing name with pname in the packaging file.

But that would not fix the root cause of the issue which is that derivations are not storing pname and version, but only name which is a string made from pname and version by default, and the data source that search and repology are using is trying to extract the version and pname from this string which does not always work cleanly.

See for example SP800-90B_EntropyAssessment where part of its pname gets mistaken as part of the version.