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
The existing header is a bit too big. Now the following use-cases are
separated, and get their own headers:
- Using or implementing an arbitrary store: remaining `store-api.hh`
This is closer to just being about the `Store` (and `StoreConfig`)
classes, as one would expect.
- Opening a store from a textual description: `store-open.hh`
Opening an aribtrary store implementation like this requires some sort
of store registration mechanism to exists, but the caller doesn't need
to know how it works. This just exposes the functions which use such a
mechanism, without exposing the mechanism itself
- Registering a store implementation: `store-registration.hh`
This requires understanding how the mechanism actually works, and the
mechanism in question involves templated machinery in headers we
rather not expose to things that don't need it, as it would slow down
compilation for no reason.
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
