nixos/documentation.nix: Use builtins.storePath when appropriate
This commit is contained in:
parent
0b222173db
commit
5d29853c38
|
@ -61,26 +61,80 @@ let
|
|||
in scrubbedEval.options;
|
||||
baseOptionsJSON =
|
||||
let
|
||||
filter =
|
||||
filterIntoStore =
|
||||
builtins.filterSource
|
||||
(n: t:
|
||||
(t == "directory" -> baseNameOf n != "tests")
|
||||
&& (t == "file" -> hasSuffix ".nix" n)
|
||||
);
|
||||
# When working directly from a checkout,
|
||||
# produce separate, smaller store paths
|
||||
# When already in the store,
|
||||
# avoid copying; reuse the whole nixpkgs sources
|
||||
#
|
||||
# We can only avoid copying when pkgs.path is already a string. A path
|
||||
# value can not be converted to a store path without rehashing it.
|
||||
# builtins.storePath would be a solution but is currently off-limits
|
||||
# because of https://github.com/NixOS/nix/issues/1888
|
||||
|
||||
# Figure out if Nix runs in pure evaluation mode. May return true in
|
||||
# impure mode, but this is highly unlikely.
|
||||
# We need to know because of https://github.com/NixOS/nix/issues/1888
|
||||
# and https://github.com/NixOS/nix/issues/5868
|
||||
pull = dir:
|
||||
if builtins.typeOf pkgs.path == "string" && isStorePath pkgs.path
|
||||
then "${pkgs.path}/${dir}"
|
||||
else filter "${toString pkgs.path}/${dir}";
|
||||
isPureEval = builtins.getEnv "PATH" == "" && builtins.getEnv "_" == "";
|
||||
|
||||
# Return a nixpkgs subpath with minimal copying.
|
||||
#
|
||||
# The sources for the base options json derivation can come in one of
|
||||
# two forms:
|
||||
# - single source: a store path with all of nixpkgs, postfix with
|
||||
# subpaths to access various directories. This has the benefit of
|
||||
# not creating copies of these subtrees in the Nix store, but
|
||||
# can cause unnecessary rebuilds if you update the Nixpkgs `pkgs`
|
||||
# tree often.
|
||||
# - split sources: multiple store paths with subdirectories of
|
||||
# nixpkgs that exclude the bulk of the pkgs directory.
|
||||
# This requires more copying and hashing during evaluation but
|
||||
# requires fewer files to be copied. This method produces fewer
|
||||
# unnecessary rebuilds of the base options json.
|
||||
#
|
||||
# Flake
|
||||
#
|
||||
# Flakes always put a copy of the full nixpkgs sources in the store,
|
||||
# so we can use the "single source" method. This method is ideal
|
||||
# for using nixpkgs as a dependency, as the base options json will be
|
||||
# substitutable from cache.nixos.org.
|
||||
#
|
||||
# This requires that the `self.outPath` is wired into `pkgs` correctly,
|
||||
# which is done for you if `pkgs` comes from the `lib.nixosSystem` or
|
||||
# `legacyPackages` flake attributes.
|
||||
#
|
||||
# Other Nixpkgs invocation
|
||||
#
|
||||
# If you do not use the known-correct flake attributes, but rather
|
||||
# invoke Nixpkgs yourself, set `config.path` to the correct path value,
|
||||
# e.g. `import nixpkgs { config.path = nixpkgs; }`.
|
||||
#
|
||||
# Choosing between single or split source paths
|
||||
#
|
||||
# We make assumptions based on the type and contents of `pkgs.path`.
|
||||
# By passing a different `config.path` to Nixpkgs, you can influence
|
||||
# how your documentation cache is evaluated and rebuilt.
|
||||
#
|
||||
# Single source
|
||||
# - If pkgs.path is a string containing a store path, the code has no
|
||||
# choice but to create this store path, if it hasn't already been.
|
||||
# We assume that the "single source" method is most efficient.
|
||||
# - If pkgs.path is a path value containing that is a store path,
|
||||
# we try to convert it to a string with context without copying.
|
||||
# This occurs for example when nixpkgs was fetched and using its
|
||||
# default `config.path`, which is `./.`.
|
||||
# Nix currently does not allow this conversion when evaluating in
|
||||
# pure mode. If the conversion is not possible, we use the
|
||||
# "split source" method.
|
||||
#
|
||||
# Split source
|
||||
# - If pkgs.path is a path value that is not a store path, we assume
|
||||
# that it's unlikely for all of nixpkgs to end up in the store for
|
||||
# other reasons and try to keep both the copying and rebuilds low.
|
||||
pull =
|
||||
if builtins.typeOf pkgs.path == "string" && isStorePath pkgs.path then
|
||||
dir: "${pkgs.path}/${dir}"
|
||||
else if !isPureEval && isStorePath pkgs.path then
|
||||
dir: "${builtins.storePath pkgs.path}/${dir}"
|
||||
else
|
||||
dir: filterIntoStore "${toString pkgs.path}/${dir}";
|
||||
in
|
||||
pkgs.runCommand "lazy-options.json" {
|
||||
libPath = pull "lib";
|
||||
|
|
Loading…
Reference in a new issue