source: add OSRelease.IDLike support

Read the ID_LIKE field and expose in OSRelease.

Author: mvo5

bib/internal/source/source.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"strings"
 
 	"github.com/sirupsen/logrus"
 
@@ -16,6 +17,7 @@ type OSRelease struct {
 	VersionID  string
 	Name       string
 	VariantID  string
+	IDLike     []string
 }
 
 type Info struct {
@@ -69,6 +71,10 @@ func LoadInfo(root string) (*Info, error) {
 	if err != nil {
 		logrus.Debugf("cannot read UEFI vendor: %v, setting it to none", err)
 	}
+	var idLike []string
+	if osrelease["ID_LIKE"] != "" {
+		idLike = strings.Split(osrelease["ID_LIKE"], " ")
+	}
 
 	return &Info{
 		OSRelease: OSRelease{
@@ -77,6 +83,7 @@ func LoadInfo(root string) (*Info, error) {
 			Name:       osrelease["NAME"],
 			PlatformID: osrelease["PLATFORM_ID"],
 			VariantID:  osrelease["VARIANT_ID"],
+			IDLike:     idLike,
 		},
 
 		UEFIVendor: vendor,

bib/internal/source/source_test.go

@@ -3,13 +3,14 @@ package source
 import (
 	"os"
 	"path"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
-func writeOSRelease(root, id, versionID, name, platformID, variantID string) error {
+func writeOSRelease(root, id, versionID, name, platformID, variantID, idLike string) error {
 	err := os.MkdirAll(path.Join(root, "etc"), 0755)
 	if err != nil {
 		return err
@@ -31,6 +32,9 @@ func writeOSRelease(root, id, versionID, name, platformID, variantID string) err
 	if variantID != "" {
 		buf += "VARIANT_ID=" + variantID + "\n"
 	}
+	if idLike != "" {
+		buf += "ID_LIKE=" + idLike + "\n"
+	}
 
 	return os.WriteFile(path.Join(root, "etc/os-release"), []byte(buf), 0644)
 }
@@ -52,21 +56,23 @@ func TestLoadInfo(t *testing.T) {
 		uefiVendor string
 		platformID string
 		variantID  string
+		idLike     string
 		errorStr   string
 	}{
-		{"happy", "fedora", "40", "Fedora Linux", "fedora", "platform:f40", "coreos", ""},
-		{"happy-no-uefi", "fedora", "40", "Fedora Linux", "", "platform:f40", "coreos", ""},
-		{"happy-no-variant_id", "fedora", "40", "Fedora Linux", "", "platform:f40", "", ""},
-		{"sad-no-id", "", "40", "Fedora Linux", "fedora", "platform:f40", "", "missing ID in os-release"},
-		{"sad-no-id", "fedora", "", "Fedora Linux", "fedora", "platform:f40", "", "missing VERSION_ID in os-release"},
-		{"sad-no-id", "fedora", "40", "", "fedora", "platform:f40", "", "missing NAME in os-release"},
-		{"sad-no-id", "fedora", "40", "Fedora Linux", "fedora", "", "", "missing PLATFORM_ID in os-release"},
+		{"happy", "fedora", "40", "Fedora Linux", "fedora", "platform:f40", "coreos", "", ""},
+		{"happy-no-uefi", "fedora", "40", "Fedora Linux", "", "platform:f40", "coreos", "", ""},
+		{"happy-no-variant_id", "fedora", "40", "Fedora Linux", "", "platform:f40", "", "", ""},
+		{"happy-with-id-like", "centos", "9", "CentOS Stream", "", "platform:el9", "", "rhel fedora", ""},
+		{"sad-no-id", "", "40", "Fedora Linux", "fedora", "platform:f40", "", "", "missing ID in os-release"},
+		{"sad-no-id", "fedora", "", "Fedora Linux", "fedora", "platform:f40", "", "", "missing VERSION_ID in os-release"},
+		{"sad-no-id", "fedora", "40", "", "fedora", "platform:f40", "", "", "missing NAME in os-release"},
+		{"sad-no-id", "fedora", "40", "Fedora Linux", "fedora", "", "", "", "missing PLATFORM_ID in os-release"},
 	}
 
 	for _, c := range cases {
 		t.Run(c.desc, func(t *testing.T) {
 			root := t.TempDir()
-			require.NoError(t, writeOSRelease(root, c.id, c.versionID, c.name, c.platformID, c.variantID))
+			require.NoError(t, writeOSRelease(root, c.id, c.versionID, c.name, c.platformID, c.variantID, c.idLike))
 			if c.uefiVendor != "" {
 				require.NoError(t, createBootupdEFI(root, c.uefiVendor))
 
@@ -85,7 +91,12 @@ func TestLoadInfo(t *testing.T) {
 			assert.Equal(t, c.uefiVendor, info.UEFIVendor)
 			assert.Equal(t, c.platformID, info.OSRelease.PlatformID)
 			assert.Equal(t, c.variantID, info.OSRelease.VariantID)
-
+			if c.idLike == "" {
+				assert.Equal(t, len(info.OSRelease.IDLike), 0)
+			} else {
+				expected := strings.Split(c.idLike, " ")
+				assert.Equal(t, expected, info.OSRelease.IDLike)
+			}
 		})
 	}
 }