GoGo modules
The function buildGoModule builds Go programs managed with Go modules. It builds a Go modules through a two phase build:
An intermediate fetcher derivation. This derivation will be used to fetch all of the dependencies of the Go module.
A final derivation will use the output of the intermediate derivation to build the binaries and produce the final output.
buildGoModule
pet = buildGoModule rec {
name = "pet-${version}";
version = "0.3.4";
src = fetchFromGitHub {
owner = "knqyf263";
repo = "pet";
rev = "v${version}";
sha256 = "0m2fzpqxk7hrbxsgqplkg7h2p7gv6s1miymv3gvw0cz039skag0s";
};
modSha256 = "1879j77k96684wi554rkjxydrj8g3hpp0kvxz03sd8dmwr3lh83j";
subPackages = [ "." ];
meta = with lib; {
description = "Simple command-line snippet manager, written in Go";
homepage = https://github.com/knqyf263/pet;
license = licenses.mit;
maintainers = with maintainers; [ kalbasit ];
platforms = platforms.linux ++ platforms.darwin;
};
}
is an example expression using buildGoModule, the following arguments are of special significance to the function:
modSha256 is the hash of the output of the intermediate fetcher derivation.
subPackages limits the builder from building child packages that have not been listed. If subPackages is not specified, all child packages will be built.
Go legacy
The function buildGoPackage builds legacy Go programs, not supporting Go modules.
buildGoPackage
deis = buildGoPackage rec {
name = "deis-${version}";
version = "1.13.0";
goPackagePath = "github.com/deis/deis";
subPackages = [ "client" ];
src = fetchFromGitHub {
owner = "deis";
repo = "deis";
rev = "v${version}";
sha256 = "1qv9lxqx7m18029lj8cw3k7jngvxs4iciwrypdy0gd2nnghc68sw";
};
goDeps = ./deps.nix;
buildFlags = "--tags release";
}
is an example expression using buildGoPackage, the following arguments are of special significance to the function:
goPackagePath specifies the package's canonical Go import path.
subPackages limits the builder from building child packages that have not been listed. If subPackages is not specified, all child packages will be built.
In this example only github.com/deis/deis/client will be built.
goDeps is where the Go dependencies of a Go program are listed as a list of package source identified by Go import path. It could be imported as a separate deps.nix file for readability. The dependency data structure is described below.
buildFlags is a list of flags passed to the go build command.
The goDeps attribute can be imported from a separate nix file that defines which Go libraries are needed and should be included in GOPATH for buildPhase.
deps.nix
[
{
goPackagePath = "gopkg.in/yaml.v2";
fetch = {
type = "git";
url = "https://gopkg.in/yaml.v2";
rev = "a83829b6f1293c91addabc89d0571c246397bbf4";
sha256 = "1m4dsmk90sbi17571h6pld44zxz7jc4lrnl4f27dpd1l8g5xvjhh";
};
}
{
goPackagePath = "github.com/docopt/docopt-go";
fetch = {
type = "git";
url = "https://github.com/docopt/docopt-go";
rev = "784ddc588536785e7299f7272f39101f7faccc3f";
sha256 = "0wwz48jl9fvl1iknvn9dqr4gfy1qs03gxaikrxxp9gry6773v3sj";
};
}
]
goDeps is a list of Go dependencies.
goPackagePath specifies Go package import path.
fetch type that needs to be used to get package source. If git is used there should be url, rev and sha256 defined next to it.
To extract dependency information from a Go package in automated way use go2nix. It can produce complete derivation and goDeps file for Go programs.
buildGoPackage produces where bin includes program binaries. You can test build a Go binary as follows:
$ nix-build -A deis.bin
or build all outputs with:
$ nix-build -A deis.all
bin output will be installed by default with nix-env -i or systemPackages.
You may use Go packages installed into the active Nix profiles by adding the following to your ~/.bashrc:
for p in $NIX_PROFILES; do
GOPATH="$p/share/go:$GOPATH"
done