156 lines
5.6 KiB
Markdown
156 lines
5.6 KiB
Markdown
# Go {#sec-language-go}
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## Go modules {#ssec-language-go}
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The function `buildGoModule` builds Go programs managed with Go modules. It builds a [Go Modules](https://github.com/golang/go/wiki/Modules) through a two phase build:
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- An intermediate fetcher derivation. This derivation will be used to fetch all of the dependencies of the Go module.
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- A final derivation will use the output of the intermediate derivation to build the binaries and produce the final output.
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### Example for `buildGoModule` {#ex-buildGoModule}
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In the following is an example expression using `buildGoModule`, the following arguments are of special significance to the function:
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- `vendorHash`: is the hash of the output of the intermediate fetcher derivation.
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`vendorHash` can also be set to `null`.
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In that case, rather than fetching the dependencies and vendoring them, the dependencies vendored in the source repo will be used.
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To avoid updating this field when dependencies change, run `go mod vendor` in your source repo and set `vendorHash = null;`
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To obtain the actual hash, set `vendorHash = lib.fakeSha256;` and run the build ([more details here](#sec-source-hashes)).
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- `proxyVendor`: Fetches (go mod download) and proxies the vendor directory. This is useful if your code depends on c code and go mod tidy does not include the needed sources to build or if any dependency has case-insensitive conflicts which will produce platform dependant `vendorHash` checksums.
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```nix
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pet = buildGoModule rec {
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pname = "pet";
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version = "0.3.4";
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src = fetchFromGitHub {
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owner = "knqyf263";
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repo = "pet";
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rev = "v${version}";
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hash = "sha256-Gjw1dRrgM8D3G7v6WIM2+50r4HmTXvx0Xxme2fH9TlQ=";
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};
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vendorHash = "sha256-ciBIR+a1oaYH+H1PcC8cD8ncfJczk1IiJ8iYNM+R6aA=";
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meta = with lib; {
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description = "Simple command-line snippet manager, written in Go";
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homepage = "https://github.com/knqyf263/pet";
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license = licenses.mit;
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maintainers = with maintainers; [ kalbasit ];
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};
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}
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```
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## `buildGoPackage` (legacy) {#ssec-go-legacy}
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The function `buildGoPackage` builds legacy Go programs, not supporting Go modules.
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### Example for `buildGoPackage` {#example-for-buildgopackage}
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In the following is an example expression using buildGoPackage, the following arguments are of special significance to the function:
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- `goPackagePath` specifies the package's canonical Go import path.
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- `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.
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```nix
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deis = buildGoPackage rec {
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pname = "deis";
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version = "1.13.0";
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goPackagePath = "github.com/deis/deis";
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src = fetchFromGitHub {
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owner = "deis";
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repo = "deis";
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rev = "v${version}";
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hash = "sha256-XCPD4LNWtAd8uz7zyCLRfT8rzxycIUmTACjU03GnaeM=";
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};
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goDeps = ./deps.nix;
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}
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```
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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`:
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```nix
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# deps.nix
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[ # goDeps is a list of Go dependencies.
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{
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# goPackagePath specifies Go package import path.
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goPackagePath = "gopkg.in/yaml.v2";
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fetch = {
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# `fetch type` that needs to be used to get package source.
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# If `git` is used there should be `url`, `rev` and `hash` defined next to it.
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type = "git";
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url = "https://gopkg.in/yaml.v2";
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rev = "a83829b6f1293c91addabc89d0571c246397bbf4";
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hash = "sha256-EMrdy0M0tNuOcITaTAmT5/dPSKPXwHDKCXFpkGbVjdQ=";
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};
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}
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{
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goPackagePath = "github.com/docopt/docopt-go";
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fetch = {
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type = "git";
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url = "https://github.com/docopt/docopt-go";
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rev = "784ddc588536785e7299f7272f39101f7faccc3f";
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hash = "sha256-Uo89zjE+v3R7zzOq/gbQOHj3SMYt2W1nDHS7RCUin3M=";
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};
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}
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]
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```
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To extract dependency information from a Go package in automated way use [go2nix](https://github.com/kamilchm/go2nix). It can produce complete derivation and `goDeps` file for Go programs.
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You may use Go packages installed into the active Nix profiles by adding the following to your ~/.bashrc:
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```bash
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for p in $NIX_PROFILES; do
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GOPATH="$p/share/go:$GOPATH"
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done
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```
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## Attributes used by the builders {#ssec-go-common-attributes}
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Both `buildGoModule` and `buildGoPackage` can be tweaked to behave slightly differently, if the following attributes are used:
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### `ldflags` {#var-go-ldflags}
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Arguments to pass to the Go linker tool via the `-ldflags` argument of `go build`. The most common use case for this argument is to make the resulting executable aware of its own version. For example:
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```nix
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ldflags = [
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"-s" "-w"
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"-X main.Version=${version}"
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"-X main.Commit=${version}"
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];
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```
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### `tags` {#var-go-tags}
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Arguments to pass to the Go via the `-tags` argument of `go build`. For example:
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```nix
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tags = [
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"production"
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"sqlite"
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];
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```
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```nix
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tags = [ "production" ] ++ lib.optionals withSqlite [ "sqlite" ];
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```
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### `deleteVendor` {#var-go-deleteVendor}
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Removes the pre-existing vendor directory. This should only be used if the dependencies included in the vendor folder are broken or incomplete.
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### `subPackages` {#var-go-subPackages}
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Specified as a string or list of strings. Limits the builder from building child packages that have not been listed. If `subPackages` is not specified, all child packages will be built.
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### `excludedPackages` {#var-go-excludedPackages}
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Specified as a string or list of strings. Causes the builder to skip building child packages that match any of the provided values. If `excludedPackages` is not specified, all child packages will be built.
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