First implementation

vendor/periph.io/x/periph/host/distro/devtree.go

@@ -0,0 +1,61 @@
+// Copyright 2016 The Periph Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package distro
+
+// DTModel returns platform model info from the Linux device tree (/proc/device-tree/model), and
+// returns "unknown" on non-linux systems or if the file is missing.
+func DTModel() string {
+	mu.Lock()
+	defer mu.Unlock()
+
+	if dtModel == "" {
+		dtModel = "<unknown>"
+		if isLinux {
+			dtModel = makeDTModelLinux()
+		}
+	}
+	return dtModel
+}
+
+// DTCompatible returns platform compatibility info from the Linux device tree
+// (/proc/device-tree/compatible), and returns []{"unknown"} on non-linux systems or if the file is
+// missing.
+func DTCompatible() []string {
+	mu.Lock()
+	defer mu.Unlock()
+
+	if dtCompatible == nil {
+		dtCompatible = []string{}
+		if isLinux {
+			dtCompatible = makeDTCompatible()
+		}
+	}
+	return dtCompatible
+}
+
+//
+
+var (
+	dtModel      string   // cached /proc/device-tree/model
+	dtCompatible []string // cached /proc/device-tree/compatible
+)
+
+func makeDTModelLinux() string {
+	// Read model from device tree.
+	if bytes, err := readFile("/proc/device-tree/model"); err == nil {
+		if model := splitNull(bytes); len(model) > 0 {
+			return model[0]
+		}
+	}
+	return "<unknown>"
+}
+
+func makeDTCompatible() []string {
+	// Read compatible from device tree.
+	if bytes, err := readFile("/proc/device-tree/compatible"); err == nil {
+		return splitNull(bytes)
+	}
+	return []string{}
+}