buildGoPackage: updated docs for goPackages after rework in https://github.com/NixOS/nixpkgs/pull/16017
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Kamil Chmielewski
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bf71761b69
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14d49ddc40
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@ -5,27 +5,29 @@
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<title>Go</title>
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<para>The function <varname>buildGoPackage</varname> builds
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standard Go packages.
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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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net = buildGoPackage rec {
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name = "go.net-${rev}";
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goPackagePath = "golang.org/x/net"; <co xml:id='ex-buildGoPackage-1' />
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subPackages = [ "ipv4" "ipv6" ]; <co xml:id='ex-buildGoPackage-2' />
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rev = "e0403b4e005";
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deis = buildGoPackage rec {
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name = "deis-${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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inherit rev;
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owner = "golang";
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repo = "net";
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sha256 = "1g7cjzw4g4301a3yqpbk8n1d4s97sfby2aysl275x04g0zh8jxqp";
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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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goPackageAliases = [ "code.google.com/p/go.net" ]; <co xml:id='ex-buildGoPackage-3' />
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propagatedBuildInputs = [ goPackages.text ]; <co xml:id='ex-buildGoPackage-4' />
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buildFlags = "--tags release"; <co xml:id='ex-buildGoPackage-5' />
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disabled = isGo13;<co xml:id='ex-buildGoPackage-6' />
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};
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goDeps = ./deps.json; <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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@ -47,64 +49,94 @@ the following arguments are of special significance to the function:
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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>code.google.com/p/go.net/ipv4</literal> and
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<literal>code.google.com/p/go.net/ipv6</literal> will be built.
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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>goPackageAliases</varname> is a list of alternative import paths
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that are valid for this library.
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Packages that depend on this library will automatically rename
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import paths that match any of the aliases to <literal>goPackagePath</literal>.
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</para>
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<para>
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In this example imports will be renamed from
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<literal>code.google.com/p/go.net</literal> to
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<literal>golang.org/x/net</literal> in every package that depend on the
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<literal>go.net</literal> library.
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<varname>goDeps</varname> is where the Go dependencies of a Go program are listed
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in a JSON format 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>propagatedBuildInputs</varname> is where the dependencies of a Go library are
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listed. Only libraries should list <varname>propagatedBuildInputs</varname>. If a standalone
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program is being built instead, use <varname>buildInputs</varname>. If a library's tests require
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additional dependencies that are not propagated, they should be listed in <varname>buildInputs</varname>.
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</para>
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</callout>
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<callout arearefs='ex-buildGoPackage-5'>
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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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<callout arearefs='ex-buildGoPackage-6'>
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<para>
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If <varname>disabled</varname> is <literal>true</literal>,
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nix will refuse to build this package.
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</para>
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<para>
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In this example the package will not be built for go 1.3. The <literal>isGo13</literal>
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is an utility function that returns <literal>true</literal> if go used to build the
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package has version 1.3.x.
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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>
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Reusable Go libraries may be found in the <varname>goPackages</varname> set. You can test
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build a Go package as follows:
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<para>The <varname>goDeps</varname> attribute should point to a JSON file that defines which Go libraries
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are needed and should be included in <varname>GOPATH</varname> for <varname>buildPhase</varname>.
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<screen>
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$ nix-build -A goPackages.net
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</screen>
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</para>
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<example xml:id='ex-goDeps'><title>deps.json</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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"include": "../../libs.json", <co xml:id='ex-goDeps-4' />
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"packages": [ <co xml:id='ex-goDeps-5' />
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"github.com/docopt/docopt-go",
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"golang.org/x/crypto",
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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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<callout arearefs='ex-goDeps-4'>
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<para>
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<varname>include</varname> could be used to reuse <varname>goDeps</varname> between Go programs.
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There is a common libs set in <varname><nixpkgs/pkgs/development/go-modules/libs.json></varname>
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with pinned versions of many packages that you can reuse.
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</para>
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</callout>
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<callout arearefs='ex-goDeps-5'>
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<para>
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<varname>packages</varname> enumerates all Go packages that will be imported from included file.
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</para>
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</callout>
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</calloutlist>
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</para>
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@ -119,6 +151,7 @@ done
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</screen>
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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>.</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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</section>
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