Add ArchLinux support (#33)

Signed-off-by: erdii <[email protected]>

os/linux/archlinux.go

@@ -0,0 +1,30 @@
+package linux
+
+import (
+	"strings"
+
+	"github.com/k0sproject/rig"
+	"github.com/k0sproject/rig/os"
+	"github.com/k0sproject/rig/os/registry"
+)
+
+// Archlinux provides OS support for Archlinux systems
+type Archlinux struct {
+	os.Linux
+}
+
+func init() {
+	registry.RegisterOSModule(
+		func(os rig.OSVersion) bool {
+			return os.IDLike == "arch"
+		},
+		func() interface{} {
+			return Archlinux{}
+		},
+	)
+}
+
+// InstallPackage installs packages via pacman
+func (c Archlinux) InstallPackage(h os.Host, s ...string) error {
+	return h.Execf("sudo pacman -S --noconfirm --noprogressbar %s", strings.Join(s, " "))
+}

resolver.go

@@ -116,6 +116,9 @@ func parseOSReleaseFile(s string, os *OSVersion) error {
 			os.ID = unquote(fields[1])
 		case "ID_LIKE":
 			os.IDLike = unquote(fields[1])
+			if os.IDLike == "arch" {
+				os.Version = "0.0.0"
+			}
 		case "VERSION_ID":
 			os.Version = unquote(fields[1])
 		case "PRETTY_NAME":