The flake bellow:
{
description = "A build system for microservices";
inputs.nixpkgs.url = "nixpkgs/nixos-22.05";
outputs = { self, nixpkgs }:
let
# to work with older version of flakes
lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
version = "0.5.3";
# System types to support.
supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
# Nixpkgs instantiated for supported system types.
nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
in
{
# Provide some binary packages for selected system types.
packages = forAllSystems (system:
let
pkgs = nixpkgs.legacyPackages.${system};
in
{
go-hello = pkgs.buildGoModule {
pname = "bob";
# In 'nix develop', we don't need a copy of the source tree
# in the Nix store.
src = ./.;
CGO_ENABLED = 0;
ldflags = [ "-s" "-w" "-X main.Version=${version}" ];
# This hash locks the dependencies of this package. It is
# necessary because of how Go requires network access to resolve
# VCS. See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for
# details. Normally one can build with a fake sha256 and rely on native Go
# mechanisms to tell you what the hash should be or determine what
# it should be "out-of-band" with other tooling (eg. gomod2nix).
# To begin with it is recommended to set this, but one must
# remeber to bump this hash when your dependencies change.
#vendorSha256 = pkgs.lib.fakeSha256;
vendorSha256 = "sha256-ZP4wzsAzwDz+86N8IUQLsWsHCg8pmyGnL6x+FOe372U=";
excludedPackages = [ "example/server-db" "test/e2e" "tui-example" ];
doCheck = false;
};
});
# The default package for 'nix build'. This makes sense if the
# flake provides only one package or there is a clear "main"
# package.
defaultPackage = forAllSystems (system: self.packages.${system}.go-hello);
};
}
fails with:
error: attribute 'name' missing for call to 'derivationStrict'
at //builtin/derivation.nix:9:12:
The issue was introduced when I added version = "0.5.3";
for some reason. Before, nix build
worked OK. It looks like if I add a name
to the buildGoModule
attr set, the issue is fixed again.
{
description = "A build system for microservices";
inputs.nixpkgs.url = "nixpkgs/nixos-22.05";
outputs = { self, nixpkgs }:
let
# to work with older version of flakes
lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
version = "0.5.3";
# System types to support.
supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
# Nixpkgs instantiated for supported system types.
nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
in
{
# Provide some binary packages for selected system types.
packages = forAllSystems (system:
let
pkgs = nixpkgs.legacyPackages.${system};
in
{
go-hello = pkgs.buildGoModule {
pname = "bob";
name = "bob${version}";
# In 'nix develop', we don't need a copy of the source tree
# in the Nix store.
src = ./.;
CGO_ENABLED = 0;
ldflags = [ "-s" "-w" "-X main.Version=${version}" ];
# This hash locks the dependencies of this package. It is
# necessary because of how Go requires network access to resolve
# VCS. See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for
# details. Normally one can build with a fake sha256 and rely on native Go
# mechanisms to tell you what the hash should be or determine what
# it should be "out-of-band" with other tooling (eg. gomod2nix).
# To begin with it is recommended to set this, but one must
# remeber to bump this hash when your dependencies change.
#vendorSha256 = pkgs.lib.fakeSha256;
vendorSha256 = "sha256-ZP4wzsAzwDz+86N8IUQLsWsHCg8pmyGnL6x+FOe372U=";
excludedPackages = [ "example/server-db" "test/e2e" "tui-example" ];
doCheck = false;
};
});
# The default package for 'nix build'. This makes sense if the
# flake provides only one package or there is a clear "main"
# package.
defaultPackage = forAllSystems (system: self.packages.${system}.go-hello);
};
}
I have 2 questions:
- I’m curios why this is happening? Why adding the version changes the behaviour?
- What’s the best value to be added in the
name
field?
For background: I’m trying to build a flake for https://github.com/benchkram/bob