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buildGoModule: function for packaging Go modules

The function buildGoModule builds Go programs managed with Go modules. It builds
a Go module 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.
This commit is contained in:
Wael M. Nasreddine 2019-03-08 11:17:05 -08:00
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@ -3,12 +3,91 @@
xml:id="sec-language-go">
<title>Go</title>
<para>
The function <varname>buildGoPackage</varname> builds standard Go programs.
</para>
<section xml:id="ssec-go-modules">
<title>Go modules</title>
<example xml:id='ex-buildGoPackage'>
<title>buildGoPackage</title>
<para>
The function <varname> buildGoModule </varname> builds Go programs managed
with Go modules. It builds a
<link xlink:href="https://github.com/golang/go/wiki/Modules">Go
modules</link> through a two phase build:
<itemizedlist>
<listitem>
<para>
An intermediate fetcher derivation. This derivation will be used to fetch
all of the dependencies of the Go module.
</para>
</listitem>
<listitem>
<para>
A final derivation will use the output of the intermediate derivation to
build the binaries and produce the final output.
</para>
</listitem>
</itemizedlist>
</para>
<example xml:id='ex-buildGoModule'>
<title>buildGoModule</title>
<programlisting>
pet = buildGoModule rec {
name = "pet-${version}";
version = "0.3.4";
src = fetchFromGitHub {
owner = "knqyf263";
repo = "pet";
rev = "v${version}";
sha256 = "0m2fzpqxk7hrbxsgqplkg7h2p7gv6s1miymv3gvw0cz039skag0s";
};
modSha256 = "1879j77k96684wi554rkjxydrj8g3hpp0kvxz03sd8dmwr3lh83j"; <co xml:id='ex-buildGoModule-1' />
subPackages = [ "." ]; <co xml:id='ex-buildGoModule-2' />
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;
};
}
</programlisting>
</example>
<para>
<xref linkend='ex-buildGoModule'/> is an example expression using
buildGoModule, the following arguments are of special significance to the
function:
<calloutlist>
<callout arearefs='ex-buildGoModule-1'>
<para>
<varname>modSha256</varname> is the hash of the output of the
intermediate fetcher derivation.
</para>
</callout>
<callout arearefs='ex-buildGoModule-2'>
<para>
<varname>subPackages</varname> limits the builder from building child
packages that have not been listed. If <varname>subPackages</varname> is
not specified, all child packages will be built.
</para>
</callout>
</calloutlist>
</para>
</section>
<section xml:id="ssec-go-legacy">
<title>Go legacy</title>
<para>
The function <varname> buildGoPackage </varname> builds legacy Go programs,
not supporting Go modules.
</para>
<example xml:id='ex-buildGoPackage'>
<title>buildGoPackage</title>
<programlisting>
deis = buildGoPackage rec {
name = "deis-${version}";
@ -29,56 +108,56 @@ deis = buildGoPackage rec {
buildFlags = "--tags release"; <co xml:id='ex-buildGoPackage-4' />
}
</programlisting>
</example>
</example>
<para>
<xref linkend='ex-buildGoPackage'/> is an example expression using
buildGoPackage, the following arguments are of special significance to the
function:
<calloutlist>
<callout arearefs='ex-buildGoPackage-1'>
<para>
<varname>goPackagePath</varname> specifies the package's canonical Go
import path.
</para>
</callout>
<callout arearefs='ex-buildGoPackage-2'>
<para>
<varname>subPackages</varname> limits the builder from building child
packages that have not been listed. If <varname>subPackages</varname> is
not specified, all child packages will be built.
</para>
<para>
In this example only <literal>github.com/deis/deis/client</literal> will
be built.
</para>
</callout>
<callout arearefs='ex-buildGoPackage-3'>
<para>
<varname>goDeps</varname> 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 <varname>deps.nix</varname> file for
readability. The dependency data structure is described below.
</para>
</callout>
<callout arearefs='ex-buildGoPackage-4'>
<para>
<varname>buildFlags</varname> is a list of flags passed to the go build
command.
</para>
</callout>
</calloutlist>
</para>
<para>
<xref linkend='ex-buildGoPackage'/> is an example expression using
buildGoPackage, the following arguments are of special significance to the
function:
<calloutlist>
<callout arearefs='ex-buildGoPackage-1'>
<para>
<varname>goPackagePath</varname> specifies the package's canonical Go
import path.
</para>
</callout>
<callout arearefs='ex-buildGoPackage-2'>
<para>
<varname>subPackages</varname> limits the builder from building child
packages that have not been listed. If <varname>subPackages</varname> is
not specified, all child packages will be built.
</para>
<para>
In this example only <literal>github.com/deis/deis/client</literal> will
be built.
</para>
</callout>
<callout arearefs='ex-buildGoPackage-3'>
<para>
<varname>goDeps</varname> 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 <varname>deps.nix</varname> file for
readability. The dependency data structure is described below.
</para>
</callout>
<callout arearefs='ex-buildGoPackage-4'>
<para>
<varname>buildFlags</varname> is a list of flags passed to the go build
command.
</para>
</callout>
</calloutlist>
</para>
<para>
The <varname>goDeps</varname> attribute can be imported from a separate
<varname>nix</varname> file that defines which Go libraries are needed and
should be included in <varname>GOPATH</varname> for
<varname>buildPhase</varname>.
</para>
<para>
The <varname>goDeps</varname> attribute can be imported from a separate
<varname>nix</varname> file that defines which Go libraries are needed and
should be included in <varname>GOPATH</varname> for
<varname>buildPhase</varname>.
</para>
<example xml:id='ex-goDeps'>
<title>deps.nix</title>
<example xml:id='ex-goDeps'>
<title>deps.nix</title>
<programlisting>
[ <co xml:id='ex-goDeps-1' />
{
@ -101,60 +180,62 @@ deis = buildGoPackage rec {
}
]
</programlisting>
</example>
</example>
<para>
<calloutlist>
<callout arearefs='ex-goDeps-1'>
<para>
<varname>goDeps</varname> is a list of Go dependencies.
</para>
</callout>
<callout arearefs='ex-goDeps-2'>
<para>
<varname>goPackagePath</varname> specifies Go package import path.
</para>
</callout>
<callout arearefs='ex-goDeps-3'>
<para>
<varname>fetch type</varname> that needs to be used to get package source.
If <varname>git</varname> is used there should be <varname>url</varname>,
<varname>rev</varname> and <varname>sha256</varname> defined next to it.
</para>
</callout>
</calloutlist>
</para>
<para>
<calloutlist>
<callout arearefs='ex-goDeps-1'>
<para>
<varname>goDeps</varname> is a list of Go dependencies.
</para>
</callout>
<callout arearefs='ex-goDeps-2'>
<para>
<varname>goPackagePath</varname> specifies Go package import path.
</para>
</callout>
<callout arearefs='ex-goDeps-3'>
<para>
<varname>fetch type</varname> that needs to be used to get package
source. If <varname>git</varname> is used there should be
<varname>url</varname>, <varname>rev</varname> and
<varname>sha256</varname> defined next to it.
</para>
</callout>
</calloutlist>
</para>
<para>
To extract dependency information from a Go package in automated way use
<link xlink:href="https://github.com/kamilchm/go2nix">go2nix</link>. It can
produce complete derivation and <varname>goDeps</varname> file for Go
programs.
</para>
<para>
To extract dependency information from a Go package in automated way use
<link xlink:href="https://github.com/kamilchm/go2nix">go2nix</link>. It can
produce complete derivation and <varname>goDeps</varname> file for Go
programs.
</para>
<para>
<varname>buildGoPackage</varname> produces
<xref linkend='chap-multiple-output' xrefstyle="select: title" /> where
<varname>bin</varname> includes program binaries. You can test build a Go
binary as follows:
<para>
<varname>buildGoPackage</varname> produces
<xref linkend='chap-multiple-output' xrefstyle="select: title" /> where
<varname>bin</varname> includes program binaries. You can test build a Go
binary as follows:
<screen>
$ nix-build -A deis.bin
</screen>
or build all outputs with:
or build all outputs with:
<screen>
$ nix-build -A deis.all
</screen>
<varname>bin</varname> output will be installed by default with
<varname>nix-env -i</varname> or <varname>systemPackages</varname>.
</para>
<varname>bin</varname> output will be installed by default with
<varname>nix-env -i</varname> or <varname>systemPackages</varname>.
</para>
<para>
You may use Go packages installed into the active Nix profiles by adding the
following to your ~/.bashrc:
<para>
You may use Go packages installed into the active Nix profiles by adding the
following to your ~/.bashrc:
<screen>
for p in $NIX_PROFILES; do
GOPATH="$p/share/go:$GOPATH"
done
</screen>
</para>
</para>
</section>
</section>