Unfortunately this requires a crazy hack to support building with
Google's proprietary Widevine DRM technology as that requires fetching
the Google Chrome sources (see also 86ff1e45ce).
The hack is required because ungoogled-chromium doesn't always use tags
that correspond to a Google Chrome release.
I forgot that string comparison isn't enough because e.g.:
>>> "89.0.4389.9" < "89.0.4389.23"
False
distutils.version.LooseVersion is undocumented but it works and is
already available so why not use it:
>>> LooseVersion("89.0.4389.9") < LooseVersion("89.0.4389.23")
True
This also adds a dedicated channel for ungoogled-chromium that enables
us to update ungoogled-chromium independently of chromium.
TODO: Automate ungoogled-chromium updates via update.py (currently it
needs to be updated manually).
Note: Unfortunately this changes the ungoogled-chromium derivation
because common.nix passes the channel as an argument to
stdenv.mkDerivation (this makes it more difficult to verify this commit
but the result should remain the same).
The gn version depends on the channel and new gn versions aren't always
backward compatible. Therefore we should also include it in
upstream-info.json (I've scoped it under "deps" as we'll likely have to
add more like this in the future).
update.nix was a huuuuge hack, abusing checksum collisions, etc., and
was extremely difficult to read and maintain, especially because
values from update.nix were also used in the derivations themselves!
I've replaced this with an implementation in Python, which I chose for
readability. Rather than generating Nix, I chose to
generate JSON, since Python can do that in the standard library and
Nix can read it.
I also set update.py as an updateScript, so Chromium can now
automatically be updated!
Fixes: https://github.com/NixOS/nixpkgs/issues/89635
