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 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).