refractor(build): move os logic to its own module.

pkg/prebuild/tools.go

@@ -5,71 +5,11 @@
 package prebuild
 
 import (
-	"os"
 	"strings"
 
 	"github.com/arduino/go-paths-helper"
-	"golang.org/x/exp/slices"
 )
 
-var (
-	osReleaseFile  = "/etc/os-release"
-	supportedDists = map[string][]string{
-		"arch":     {},
-		"debian":   {},
-		"ubuntu":   {},
-		"opensuse": {"suse", "opensuse-tumbleweed"},
-		"whonix":   {},
-	}
-)
-
-func NewOSRelease() map[string]string {
-	var lines []string
-	var err error
-	for _, name := range []string{osReleaseFile, "/usr/lib/os-release"} {
-		path := paths.New(name)
-		if path.Exist() {
-			lines, err = path.ReadFileAsLines()
-			if err != nil {
-				panic(err)
-			}
-			break
-		}
-	}
-	os := map[string]string{}
-	for _, line := range lines {
-		item := strings.Split(line, "=")
-		if len(item) == 2 {
-			os[item[0]] = strings.Trim(item[1], "\"")
-		}
-	}
-	return os
-}
-
-func getSupportedDistribution() string {
-	dist, present := os.LookupEnv("DISTRIBUTION")
-	if present {
-		return dist
-	}
-
-	os := NewOSRelease()
-	id := os["ID"]
-	if id == "ubuntu" {
-		return id
-	}
-	id_like := os["ID_LIKE"]
-	for main, based := range supportedDists {
-		if main == id || main == id_like {
-			return main
-		} else if slices.Contains(based, id) {
-			return main
-		} else if slices.Contains(based, id_like) {
-			return main
-		}
-	}
-	return id
-}
-
 func copyTo(src *paths.Path, dst *paths.Path) error {
 	files, err := src.ReadDirRecursiveFiltered(nil, paths.FilterOutDirectories(), paths.FilterOutNames("README.md"))
 	if err != nil {