166 lines
4.7 KiB
XML
166 lines
4.7 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xml:id="sec-language-go">
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<title>Go</title>
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<para>The function <varname>buildGoPackage</varname> builds
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standard Go programs.
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</para>
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<example xml:id='ex-buildGoPackage'><title>buildGoPackage</title>
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<programlisting>
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deis = buildGoPackage rec {
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name = "deis-${version}";
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version = "1.13.0";
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goPackagePath = "github.com/deis/deis"; <co xml:id='ex-buildGoPackage-1' />
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subPackages = [ "client" ]; <co xml:id='ex-buildGoPackage-2' />
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src = fetchFromGitHub {
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owner = "deis";
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repo = "deis";
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rev = "v${version}";
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sha256 = "1qv9lxqx7m18029lj8cw3k7jngvxs4iciwrypdy0gd2nnghc68sw";
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};
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goDeps = ./deps.nix; <co xml:id='ex-buildGoPackage-3' />
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buildFlags = "--tags release"; <co xml:id='ex-buildGoPackage-4' />
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}
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</programlisting>
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</example>
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<para><xref linkend='ex-buildGoPackage'/> is an example expression using buildGoPackage,
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the following arguments are of special significance to the function:
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<calloutlist>
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<callout arearefs='ex-buildGoPackage-1'>
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<para>
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<varname>goPackagePath</varname> specifies the package's canonical Go import path.
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</para>
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</callout>
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<callout arearefs='ex-buildGoPackage-2'>
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<para>
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<varname>subPackages</varname> limits the builder from building child packages that
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have not been listed. If <varname>subPackages</varname> is not specified, all child
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packages will be built.
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</para>
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<para>
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In this example only <literal>github.com/deis/deis/client</literal> will be built.
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</para>
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</callout>
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<callout arearefs='ex-buildGoPackage-3'>
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<para>
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<varname>goDeps</varname> is where the Go dependencies of a Go program are listed
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as a list of package source identified by Go import path.
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It could be imported as a separate <varname>deps.nix</varname> file for
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readability. The dependency data structure is described below.
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</para>
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</callout>
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<callout arearefs='ex-buildGoPackage-4'>
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<para>
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<varname>buildFlags</varname> is a list of flags passed to the go build command.
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</para>
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</callout>
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</calloutlist>
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</para>
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<para>The <varname>goDeps</varname> attribute can be imported from a separate
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<varname>nix</varname> file that defines which Go libraries are needed and should
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be included in <varname>GOPATH</varname> for <varname>buildPhase</varname>.
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</para>
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<example xml:id='ex-goDeps'><title>deps.nix</title>
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<programlisting>
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[ <co xml:id='ex-goDeps-1' />
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{
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goPackagePath = "gopkg.in/yaml.v2"; <co xml:id='ex-goDeps-2' />
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fetch = {
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type = "git"; <co xml:id='ex-goDeps-3' />
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url = "https://gopkg.in/yaml.v2";
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rev = "a83829b6f1293c91addabc89d0571c246397bbf4";
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sha256 = "1m4dsmk90sbi17571h6pld44zxz7jc4lrnl4f27dpd1l8g5xvjhh";
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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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sha256 = "0wwz48jl9fvl1iknvn9dqr4gfy1qs03gxaikrxxp9gry6773v3sj";
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};
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}
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]
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</programlisting>
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</example>
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<para>
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<calloutlist>
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<callout arearefs='ex-goDeps-1'>
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<para>
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<varname>goDeps</varname> is a list of Go dependencies.
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</para>
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</callout>
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<callout arearefs='ex-goDeps-2'>
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<para>
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<varname>goPackagePath</varname> specifies Go package import path.
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</para>
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</callout>
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<callout arearefs='ex-goDeps-3'>
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<para>
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<varname>fetch type</varname> that needs to be used to get package source. If <varname>git</varname>
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is used there should be <varname>url</varname>, <varname>rev</varname> and <varname>sha256</varname>
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defined next to it.
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</para>
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</callout>
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</calloutlist>
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</para>
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<para>To extract dependency information from a Go package in automated way use <link xlink:href="https://github.com/kamilchm/go2nix">go2nix</link>.
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It can produce complete derivation and <varname>goDeps</varname> file for Go programs.</para>
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<para>
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<varname>buildGoPackage</varname> produces <xref linkend='chap-multiple-output' xrefstyle="select: title" />
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where <varname>bin</varname> includes program binaries. You can test build a Go binary as follows:
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<screen>
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$ nix-build -A deis.bin
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</screen>
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or build all outputs with:
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<screen>
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$ nix-build -A deis.all
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</screen>
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<varname>bin</varname> output will be installed by default with <varname>nix-env -i</varname>
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or <varname>systemPackages</varname>.
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</para>
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<para>
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You may use Go packages installed into the active Nix profiles by adding
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the following to your ~/.bashrc:
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<screen>
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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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</screen>
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</para>
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</section>
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