Initial commit

pkg/vars/boot.go

@@ -0,0 +1,32 @@
+package vars
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+)
+
+var (
+	bootVarPrefix = []byte("direktil.var.")
+)
+
+func BootArgs() [][]byte {
+	ba, err := ioutil.ReadFile("/proc/cmdline")
+	if err != nil {
+		// should not happen
+		panic(fmt.Errorf("failed to read /proc/cmdline: ", err))
+	}
+
+	return bytes.Split(ba, []byte{' '})
+}
+
+func BootArgValue(prefix, defaultValue string) string {
+	prefixB := []byte("direktil." + prefix + "=")
+	for _, ba := range BootArgs() {
+		if bytes.HasPrefix(ba, prefixB) {
+			return string(ba[len(prefixB):])
+		}
+	}
+
+	return defaultValue
+}