From 51f2599bddbc3079ee32a6fd5e1cec1acf88e7cb Mon Sep 17 00:00:00 2001
From: David Bariod <davidriod@googlemail.com>
Date: Sun, 12 Sep 2021 15:52:09 +0200
Subject: [PATCH 1/3] reduce the list of cross build target

---
 ci/magefile.go | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/ci/magefile.go b/ci/magefile.go
index 9aa603939..789ccde8f 100644
--- a/ci/magefile.go
+++ b/ci/magefile.go
@@ -1,3 +1,4 @@
+//go:build mage
 // +build mage
 
 package main
@@ -7,13 +8,34 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"sort"
 
 	"github.com/magefile/mage/mg"
 	"github.com/magefile/mage/sh"
 )
 
+func intersect(a, b []string) []string {
+	sort.Strings(a)
+	sort.Strings(b)
+
+	res := make([]string, 0, func() int {
+		if len(a) < len(b) {
+			return len(a)
+		}
+		return len(b)
+	}())
+
+	for _, v := range a {
+		idx := sort.SearchStrings(b, v)
+		if idx < len(b) && b[idx] == v {
+			res = append(res, v)
+		}
+	}
+	return res
+}
+
 // getBuildMatrix returns the build matrix from the current version of the go compiler
-func getBuildMatrix() (map[string][]string, error) {
+func getFullBuildMatrix() (map[string][]string, error) {
 	jsonData, err := sh.Output("go", "tool", "dist", "list", "-json")
 	if err != nil {
 		return nil, err
@@ -38,6 +60,31 @@ func getBuildMatrix() (map[string][]string, error) {
 	return matrix, nil
 }
 
+func getBuildMatrix() (map[string][]string, error) {
+	minimalMatrix := map[string][]string{
+		"linux":   []string{"amd64"},
+		"darwin":  []string{"amd64", "arm64"},
+		"freebsd": []string{"amd64"},
+		"js":      []string{"wasm"},
+		"solaris": []string{"amd64"},
+		"windows": []string{"amd64", "arm64"},
+	}
+
+	fullMatrix, err := getFullBuildMatrix()
+	if err != nil {
+		return nil, err
+	}
+
+	for os, arches := range minimalMatrix {
+		if fullV, ok := fullMatrix[os]; !ok {
+			delete(minimalMatrix, os)
+		} else {
+			minimalMatrix[os] = intersect(arches, fullV)
+		}
+	}
+	return minimalMatrix, nil
+}
+
 func CrossBuild() error {
 	matrix, err := getBuildMatrix()
 	if err != nil {

From f25cd754cf33cc725126bb251edd01f180ad31b2 Mon Sep 17 00:00:00 2001
From: David Bariod <davidriod@googlemail.com>
Date: Sun, 12 Sep 2021 15:58:50 +0200
Subject: [PATCH 2/3] remove duplicated build constraints line

---
 ci/magefile.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/ci/magefile.go b/ci/magefile.go
index 789ccde8f..ceda305cd 100644
--- a/ci/magefile.go
+++ b/ci/magefile.go
@@ -1,5 +1,4 @@
 //go:build mage
-// +build mage
 
 package main
 

From 25e89b7d23013b9cd8570fee4a6ed24a6dd883de Mon Sep 17 00:00:00 2001
From: David Bariod <davidriod@googlemail.com>
Date: Sun, 12 Sep 2021 15:59:08 +0200
Subject: [PATCH 3/3] do not run the linter on windows

---
 .github/workflows/ci.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index ed5818a0f..6dc83a5d4 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -15,7 +15,7 @@ jobs:
     timeout-minutes: 10
     strategy:
       matrix:
-        platform: [ubuntu-latest, windows-latest]
+        platform: [ubuntu-latest]
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v2