This renders the rl-next notes when `officialRelease = false`, which
corresponds to the case where we're not on a release branch.
Previously we had disabled this behavior because changelog-d is
somewhat of a heavy dependency, being the only Haskell package.
However, we now have new circumstances that topple the tradeoff.
- We render `master` docs to https://nix.dev/manual/nix/development/release-notes/rl-next.html
- `.#manual` is a separate build now, so `nix build nix/foo` is
not affected by the increased closure of build input outputs.
Because of these factors, I believe adding this functionality back
is more valuable, as we can use it to
- Previous release notes
- Showcase the upcoming release to the community
I can't find a good way to benchmark in isolation from the
git cache, but common sense dictates that creating (and destroying)
a 131KiB std::vector for each regular file from the archive imposes
quite a significant overhead regardless of the IO bound git cache.
AFAICT there is no reason to keep a copy of the data since
it always gets fed into the sink and there are no coroutines/threads
in sight.
warning: installing Nix as root is not supported by this script!
performing a single-user installation of Nix...
copying Nix to /nix/store.......................................................
......
warning: the group 'nixbld' specified in 'build-users-group' does not exist
warning: the group 'nixbld' specified in 'build-users-group' does not exist
installing 'nix-2.28.3'
error: the group 'nixbld' specified in 'build-users-group' does not exist
/tmp/nix-binary-tarball-unpack.2j3lCU0A89/unpack/nix-2.28.3-x86_64-linux/install: unable to install Nix into your default profile
The nixos/nix docker image is built using `buildLayeredImage`, which spreads the nix store over a configured number of layers. This number was set to create an image with 100 layers. Because there is a limit of (typically) 127 layers in AUFS, this only left 27 layers to build on top. At the same time, nearly half of the created layers were only <100kb in size, many even <10kb, negating the intended advantage in cachability.
This commit moves the tradeoff a bit by reducing the number of layers to 70.
Layer sizes for the 2.28.3 nixos/nix image: https://hub.docker.com/layers/nixos/nix/2.28.3/images/sha256-d078d7153763895fce17c5fbbdeb86fcfcac414ca0ba875d413c1df57be19931
