124 lines
4 KiB
XML
124 lines
4 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 packages.
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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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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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};
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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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</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>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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</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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</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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<screen>
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$ nix-build -A goPackages.net
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</screen>
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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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<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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</section>
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