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flake.nix: Tidy packages build matrix code

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flatMapAttrs is easier to read because it introduces the values
before using them, kind of like a `let` bindings with multiple
values.

The repeated comments remind the reader of the purpose of the
innermost attrsets, which is actually very simple.
Knowing that they go right into the result should help a lot
with building a mental model for this pattern.
This commit is contained in:
Robert Hensing 2024-06-26 02:03:21 +02:00
parent 052f1320dd
commit e28e6b96bb
1 changed files with 33 additions and 29 deletions
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62
flake.nix
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@ -351,36 +351,40 @@
// devFlake.checks.${system} or {}
);
packages = forAllSystems (system: {
inherit (nixpkgsFor.${system}.native)
changelog-d;
default = self.packages.${system}.nix;
nix-internal-api-docs = nixpkgsFor.${system}.native.nix-internal-api-docs;
nix-external-api-docs = nixpkgsFor.${system}.native.nix-external-api-docs;
} // lib.concatMapAttrs
# We need to flatten recursive attribute sets of derivations to pass `flake check`.
(pkgName: {}: {
"${pkgName}" = nixpkgsFor.${system}.native.${pkgName};
"${pkgName}-static" = nixpkgsFor.${system}.static.${pkgName};
} // lib.concatMapAttrs
(crossSystem: {}: {
"${pkgName}-${crossSystem}" = nixpkgsFor.${system}.cross.${crossSystem}.${pkgName};
})
(lib.genAttrs crossSystems (_: { }))
// lib.concatMapAttrs
(stdenvName: {}: {
"${pkgName}-${stdenvName}" = nixpkgsFor.${system}.stdenvs."${stdenvName}Packages".${pkgName};
})
(lib.genAttrs stdenvs (_: { })))
{
"nix" = { };
# Temporarily disabled because GitHub Actions OOM issues. Once
# the old build system is gone and we are back to one build
# system, we should reenable these.
#"nix-util" = { };
#"nix-store" = { };
#"nix-fetchers" = { };
packages = forAllSystems (system:
{ # Here we put attributes that map 1:1 into packages.<system>, ie
# for which we don't apply the full build matrix such as cross or static.
inherit (nixpkgsFor.${system}.native)
changelog-d;
default = self.packages.${system}.nix;
nix-internal-api-docs = nixpkgsFor.${system}.native.nix-internal-api-docs;
nix-external-api-docs = nixpkgsFor.${system}.native.nix-external-api-docs;
}
# We need to flatten recursive attribute sets of derivations to pass `flake check`.
// flatMapAttrs
{ # Components we'll iterate over in the upcoming lambda
"nix" = { };
# Temporarily disabled because GitHub Actions OOM issues. Once
# the old build system is gone and we are back to one build
# system, we should reenable these.
#"nix-util" = { };
#"nix-store" = { };
#"nix-fetchers" = { };
}
(pkgName: {}: {
# These attributes go right into `packages.<system>`.
"${pkgName}" = nixpkgsFor.${system}.native.${pkgName};
"${pkgName}-static" = nixpkgsFor.${system}.static.${pkgName};
}
// flatMapAttrs (lib.genAttrs crossSystems (_: { })) (crossSystem: {}: {
# These attributes go right into `packages.<system>`.
"${pkgName}-${crossSystem}" = nixpkgsFor.${system}.cross.${crossSystem}.${pkgName};
})
// flatMapAttrs (lib.genAttrs stdenvs (_: { })) (stdenvName: {}: {
# These attributes go right into `packages.<system>`.
"${pkgName}-${stdenvName}" = nixpkgsFor.${system}.stdenvs."${stdenvName}Packages".${pkgName};
})
)
// lib.optionalAttrs (builtins.elem system linux64BitSystems) {
dockerImage =
let