| --- |
| license: cc0-1.0 |
| pretty_name: Release tarball checksums (Debian, Homebrew, Guix) |
| tags: |
| - file-hashes |
| configs: |
| - config_name: data |
| data_files: data/tarballs.parquet |
| - config_name: maps |
| data_files: maps/md5.parquet |
| --- |
| |
| # Release tarball checksums (Debian, Homebrew, Guix) |
|
|
| Per-artifact checksums of **release archives as shipped** — the |
| tarball itself, not its contents. Content-level indexes (Software |
| Heritage, distro file digests) unpack archives before hashing, so a |
| pristine `hello-2.12.3.tar.gz` matches nothing in them; the three |
| package indexes here publish exact hashes of the artifact: |
|
|
| - **debian** — sid `Sources.xz`, all four components: md5 **and** |
| sha256 per source file (orig/debian tarballs, `.dsc`, `.asc`) — |
| each row is a single witness carrying both digests |
| - **homebrew** — `formula.json`: sha256 of each formula's stable |
| upstream archive |
| - **guix** — `sources.json`, `outputHashMode=flat` entries only |
| (recursive entries are NAR-style directory hashes, not raw bytes): |
| sha256 of raw tarball bytes, with content-addressed mirror URLs |
|
|
| **159,973 rows** (debian 131,303 / guix 20,390 / homebrew 8,280), |
| harvested 2026-08-11. |
|
|
| ## Layout |
|
|
| - `data/tarballs.parquet` — witness, sha256, md5, name, version, |
| filename, loc; **sorted by sha256**. `loc` is the Debian pool |
| directory, the Homebrew upstream URL, or the Guix content-addressed |
| mirror URL. |
| - `maps/md5.parquet` — md5 → sha256 (Debian rows), **sorted by md5**. |
| - `tarballs.sha256.bloom` — DCSO-format membership filter over the |
| 153,245 distinct sha256 keys (p = 10⁻⁴, 359 KiB, lowercase-hex |
| keys). `hdx filters fetch tarballs` installs it so `hdx scan` can |
| route matching files to this dataset. |
| - `tarballs.tsv.gz` — the normalized harvest the parquet is built |
| from. |
|
|
| Both parquet files carry page indexes (zstd, no dictionaries, |
| 128 KiB pages), so a point lookup over HTTP range reads fetches a few |
| tens of KB. This is how [hashdex](https://github.com/davidar/hashdex) |
| resolves hashes from the CLI and from a static browser page. |
|
|
| ## Rebuild |
|
|
| `release_tarballs.py` in this repo fetches the three indexes (six |
| metadata GETs, ~50 MB, no package content) and writes the TSV; |
| `tarballs_parquet.py` converts and verifies (sorted keys, page |
| indexes present). The bloom is built by hdx itself from the TSV's |
| distinct sha256 column: |
|
|
| ``` |
| zcat tarballs.tsv.gz | cut -f2 | sort -u > sha256.txt |
| hdx filters build tarballs sha256 sha256.txt |
| # → ~/.cache/hashdex/filters/tarballs.sha256.bloom |
| ``` |
|
|
| Sources move — Debian sid continuously, Homebrew and Guix per |
| commit — so a rebuild reflects harvest time; regenerate all three |
| artifacts (parquet, maps, bloom) from the same TSV so they never |
| disagree. |
|
|
| Checksums metadata © the respective projects (Debian archive, |
| Homebrew, GNU Guix), generously public; this compilation CC0. |
|
|
