| --- |
| license: cc0-1.0 |
| pretty_name: Install-media checksums (32 distros) |
| tags: |
| - file-hashes |
| configs: |
| - config_name: data |
| data_files: |
| - split: sha256 |
| path: data/media-sha256.parquet |
| - split: sha512 |
| path: data/media-sha512.parquet |
| - split: sha1 |
| path: data/media-sha1.parquet |
| - split: md5 |
| path: data/media-md5.parquet |
| --- |
| |
| # Install-media checksums (32 distros) |
|
|
| Per-image checksums of **OS install and live media as released**, |
| harvested from the distros' own checksum documents (SHA256SUMS and |
| friends) beside the images. Nobody aggregates these (quickget ships |
| per-distro endpoint *recipes*; osinfo-db has no hashes at all), so |
| this dataset does. Every row's claim URL is the checksum document |
| itself — the statement is the project's own. |
|
|
| **382,780 rows** across 32 witnesses, full release history wherever |
| the tree enumerates it, harvested 2026-08-15: |
|
|
| - **ubuntu** (releases + old-releases back to warty 4.10, MD5SUMS era |
| included) plus every cdimage flavor tree (kubuntu, xubuntu, |
| lubuntu, ubuntu-mate, ubuntustudio, ubuntu-budgie, ubuntukylin, |
| ubuntucinnamon, edubuntu, ubuntu-unity, ubuntu-gnome, mythbuntu) |
| - **debian** — current debian-cd/-live plus the whole cdimage archive |
| (~150 point releases) |
| - **fedora** — every release: dl (current), archives, Fedora Core |
| 1–6 (SHA1SUM era), secondary arches |
| - **archlinux** (every monthly ISO via the releng JSON), **almalinux**, |
| **rockylinux** (vault), **centos-stream**, **linuxmint** (+ LMDE), |
| **kali**, **opensuse** (Leap history + Tumbleweed), **alpine**, |
| **openbsd**, **freebsd**, **netbsd** (per-release SHA512), |
| **void**, **qubes** (`.DIGESTS` co-stating md5+sha1+sha256+sha512 — |
| 4-hash single-witness rows), **raspberrypi** (dated image trees), |
| **endeavouros** (sha512), **openwrt** (every release, all targets, |
| top-level images only), **proxmox**, **zorin** |
|
|
| Digest schemes are whatever each document states: modern rows are |
| sha256 (some sha512); pre-2007 media are md5/sha1-only and should be |
| treated as weak lookup keys, never merge keys. |
|
|
| ## Layout |
|
|
| One table per key scheme, each holding every row that carries that |
| scheme, **sorted by it** (rows appear in several tables when one |
| document co-stated several digests): |
|
|
| - `data/media-sha256.parquet` — witness, sha256, sha512, sha1, md5, |
| name, version, filename, loc |
| - `data/media-sha512.parquet`, `data/media-sha1.parquet`, |
| `data/media-md5.parquet` — same columns, different sort key |
| - `install-media.sha256.bloom` — DCSO-format membership filter over |
| the 370,310 distinct sha256 keys (p = 10⁻⁴, lowercase-hex keys). |
| `hdx filters fetch install-media` installs it so `hdx scan` can |
| route matching files to this dataset. |
| - `media.tsv.gz` — the normalized harvest the parquet is built from |
| (one row per witness × scheme × file; the parquet regroups digests |
| only when one document co-stated them — sibling checksum documents |
| never merge) |
|
|
| `loc` is the URL of the checksum document stating the digest. All |
| tables 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) answers |
| `hdx <iso-sha256>` with "Fedora releases these bytes as |
| Fedora-Workstation-Live-44-1.7.x86_64.iso" — from the CLI and from a |
| static browser page. |
| |
| ## Rebuild |
| |
| `tools/install_media.py` (checksum-document GETs only, never |
| content) then `tools/media_parquet.py`, both in this repo and in the |
| hashdex GitHub repo. Trees are a point-in-time snapshot; re-harvest |
| refreshes them (delete the dumps cache first). |
|
|
