providers/linux/os.go - Get OS info from Manjaro Linux (#183)

Manjaro was not working as expected because the `DISTRIB_RELEASE` value
was never used to get the OS version.

There was no OS distribution family for "arch". So this maps Majaro as
part of the "arch" family along with Arch Linux itself and Antergos.

Added an additional fallback to use the `ID_LIKE` field in `os-release`
to determine the OS distribution family.

I replaced the deprecated `io/ioutil` with the `os` package.

Fixes #168

.changelog/183.txt

@@ -0,0 +1,7 @@
+```release-note:enhancement
+linux: Added an `os.Family` mapping for Arch Linux based distributions.
+```
+
+```release-note:bug
+linux: Fix OS metadata collection for Manjaro Linux.
+```

providers/linux/os.go

@@ -21,7 +21,6 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -50,12 +49,13 @@ var (
 
 // familyMap contains a mapping of family -> []platforms.
 var familyMap = map[string][]string{
+	"arch": {"arch", "antergos", "manjaro"},
 	"redhat": {
 		"redhat", "fedora", "centos", "scientific", "oraclelinux", "ol",
 		"amzn", "rhel", "almalinux", "openeuler", "rocky",
 	},
 	"debian": {"debian", "ubuntu", "raspbian", "linuxmint"},
-	"suse":   {"suse", "sles", "opensuse", "opensuse-leap", "opensuse-tumbleweed"},
+	"suse":   {"suse", "sles", "opensuse"},
 }
 
 var platformToFamilyMap map[string]string
@@ -99,9 +99,9 @@ func getOSInfo(baseDir string) (*types.OSInfo, error) {
 }
 
 func getOSRelease(baseDir string) (*types.OSInfo, error) {
-	lsbRel, _ := ioutil.ReadFile(filepath.Join(baseDir, lsbRelease))
+	lsbRel, _ := os.ReadFile(filepath.Join(baseDir, lsbRelease))
 
-	osRel, err := ioutil.ReadFile(filepath.Join(baseDir, osRelease))
+	osRel, err := os.ReadFile(filepath.Join(baseDir, osRelease))
 	if err != nil {
 		return nil, err
 	}
@@ -150,21 +150,15 @@ func parseOSRelease(content []byte) (*types.OSInfo, error) {
 func makeOSInfo(osRelease map[string]string) (*types.OSInfo, error) {
 	os := &types.OSInfo{
 		Type:     "linux",
-		Platform: osRelease["ID"],
-		Name:     osRelease["NAME"],
-		Version:  osRelease["VERSION"],
+		Platform: firstOf(osRelease, "ID", "DISTRIB_ID"),
+		Name:     firstOf(osRelease, "NAME", "PRETTY_NAME"),
+		Version:  firstOf(osRelease, "VERSION", "VERSION_ID", "DISTRIB_RELEASE"),
 		Build:    osRelease["BUILD_ID"],
-		Codename: osRelease["VERSION_CODENAME"],
-	}
-
-	if os.Version == "" {
-		// Fallback to VERSION_ID if VERSION is empty.
-		os.Version = osRelease["VERSION_ID"]
+		Codename: firstOf(osRelease, "VERSION_CODENAME", "DISTRIB_CODENAME"),
 	}
 
 	if os.Codename == "" {
-		// Some OSes uses their own CODENAME keys (e.g UBUNTU_CODENAME) or we
-		// can get the DISTRIB_CODENAME value from the lsb-release data.
+		// Some OSes use their own CODENAME keys (e.g UBUNTU_CODENAME).
 		for k, v := range osRelease {
 			if strings.Contains(k, "CODENAME") {
 				os.Codename = v
@@ -174,10 +168,19 @@ func makeOSInfo(osRelease map[string]string) (*types.OSInfo, error) {
 	}
 
 	if os.Platform == "" {
-		// Fallback to the first word of the NAME field.
-		parts := strings.SplitN(os.Name, " ", 2)
-		if len(parts) > 0 {
-			os.Platform = strings.ToLower(parts[0])
+		// Fallback to the first word of the Name field.
+		os.Platform, _, _ = strings.Cut(os.Name, " ")
+	}
+
+	os.Family = linuxFamily(os.Platform)
+	if os.Family == "" {
+		// ID_LIKE is a space-separated list of OS identifiers that this
+		// OS is similar to. Use this to figure out the Linux family.
+		for _, id := range strings.Fields(osRelease["ID_LIKE"]) {
+			os.Family = linuxFamily(id)
+			if os.Family != "" {
+				break
+			}
 		}
 	}
 
@@ -200,7 +203,6 @@ func makeOSInfo(osRelease map[string]string) (*types.OSInfo, error) {
 		}
 	}
 
-	os.Family = platformToFamilyMap[strings.ToLower(os.Platform)]
 	return os, nil
 }
 
@@ -231,7 +233,7 @@ func findDistribRelease(baseDir string) (*types.OSInfo, error) {
 }
 
 func getDistribRelease(file string) (*types.OSInfo, error) {
-	data, err := ioutil.ReadFile(file)
+	data, err := os.ReadFile(file)
 	if err != nil {
 		return nil, err
 	}
@@ -277,6 +279,40 @@ func parseDistribRelease(platform string, content []byte) (*types.OSInfo, error)
 		}
 	}
 
-	os.Family = platformToFamilyMap[strings.ToLower(os.Platform)]
+	os.Family = linuxFamily(os.Platform)
 	return os, nil
 }
+
+// firstOf returns the first non-empty value found in the map while
+// iterating over keys.
+func firstOf(kv map[string]string, keys ...string) string {
+	for _, key := range keys {
+		if v := kv[key]; v != "" {
+			return v
+		}
+	}
+	return ""
+}
+
+// linuxFamily returns the linux distribution family associated to the OS platform.
+// If there is no family associated then it returns an empty string.
+func linuxFamily(platform string) string {
+	if platform == "" {
+		return ""
+	}
+
+	platform = strings.ToLower(platform)
+
+	// First try a direct lookup.
+	if family, found := platformToFamilyMap[platform]; found {
+		return family
+	}
+
+	// Try prefix matching (e.g. opensuse matches opensuse-tumpleweed).
+	for platformPrefix, family := range platformToFamilyMap {
+		if strings.HasPrefix(platform, platformPrefix) {
+			return family
+		}
+	}
+	return ""
+}

providers/linux/os_test.go

@@ -80,6 +80,20 @@ func TestOperatingSystem(t *testing.T) {
 		}, *os)
 		t.Logf("%#v", os)
 	})
+	t.Run("archlinux", func(t *testing.T) {
+		os, err := getOSInfo("testdata/archlinux")
+		if err != nil {
+			t.Fatal(err)
+		}
+		assert.Equal(t, types.OSInfo{
+			Type:     "linux",
+			Family:   "arch",
+			Platform: "archarm",
+			Name:     "Arch Linux ARM",
+			Build:    "rolling",
+		}, *os)
+		t.Logf("%#v", os)
+	})
 	t.Run("centos6", func(t *testing.T) {
 		os, err := getOSInfo("testdata/centos6")
 		if err != nil {
@@ -181,6 +195,22 @@ func TestOperatingSystem(t *testing.T) {
 		}, *os)
 		t.Logf("%#v", os)
 	})
+	t.Run("manjaro23", func(t *testing.T) {
+		os, err := getOSInfo("testdata/manjaro23")
+		if err != nil {
+			t.Fatal(err)
+		}
+		assert.Equal(t, types.OSInfo{
+			Type:     "linux",
+			Family:   "arch",
+			Platform: "manjaro-arm",
+			Name:     "Manjaro ARM",
+			Version:  "23.02",
+			Major:    23,
+			Minor:    2,
+		}, *os)
+		t.Logf("%#v", os)
+	})
 	t.Run("redhat7", func(t *testing.T) {
 		os, err := getOSInfo("testdata/redhat7")
 		if err != nil {

providers/linux/testdata/archlinux/etc/os-release

@@ -0,0 +1 @@
+../usr/lib/os-release

providers/linux/testdata/archlinux/usr/lib/os-release

@@ -0,0 +1,11 @@
+NAME="Arch Linux ARM"
+PRETTY_NAME="Arch Linux ARM"
+ID=archarm
+ID_LIKE=arch
+BUILD_ID=rolling
+ANSI_COLOR="38;2;23;147;209"
+HOME_URL="https://archlinuxarm.org/"
+DOCUMENTATION_URL="https://archlinuxarm.org/wiki"
+SUPPORT_URL="https://archlinuxarm.org/forum"
+BUG_REPORT_URL="https://github.com/archlinuxarm/PKGBUILDs/issues"
+LOGO=archlinux-logo

providers/linux/testdata/manjaro23/etc/lsb-release

@@ -0,0 +1,4 @@
+DISTRIB_ID=Manjaro-ARM
+DISTRIB_RELEASE=23.02
+DISTRIB_CODENAME=
+DISTRIB_DESCRIPTION="Manjaro ARM Linux"

providers/linux/testdata/manjaro23/etc/os-release

@@ -0,0 +1 @@
+../usr/lib/os-release

providers/linux/testdata/manjaro23/usr/lib/os-release

@@ -0,0 +1,8 @@
+NAME="Manjaro ARM"
+ID="manjaro-arm"
+ID_LIKE="manjaro arch"
+PRETTY_NAME="Manjaro ARM"
+ANSI_COLOR="1;32"
+HOME_URL="https://www.manjaro.org/"
+SUPPORT_URL="https://forum.manjaro.org/c/arm/"
+LOGO=manjarolinux