helper: move bwrap into helper

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

helper/bwrap/config.pair.go

@@ -0,0 +1,54 @@
+package bwrap
+
+import "strconv"
+
+const (
+	SetEnv = iota
+
+	Bind
+	BindTry
+	DevBind
+	DevBindTry
+	ROBind
+	ROBindTry
+
+	Chmod
+
+	pairC
+)
+
+var pairArgs = func() (n [pairC]string) {
+	n[SetEnv] = "--setenv"
+
+	n[Bind] = "--bind"
+	n[BindTry] = "--bind-try"
+	n[DevBind] = "--dev-bind"
+	n[DevBindTry] = "--dev-bind-try"
+	n[ROBind] = "--ro-bind"
+	n[ROBindTry] = "--ro-bind-try"
+
+	n[Chmod] = "--chmod"
+
+	return
+}()
+
+func (c *Config) pairArgs() (n [pairC][][2]string) {
+	n[SetEnv] = make([][2]string, 0, len(c.SetEnv))
+	for k, v := range c.SetEnv {
+		n[SetEnv] = append(n[SetEnv], [2]string{k, v})
+	}
+
+	n[Bind] = c.Bind
+	n[BindTry] = c.BindTry
+	n[DevBind] = c.DevBind
+	n[DevBindTry] = c.DevBindTry
+	n[ROBind] = c.ROBind
+	n[ROBindTry] = c.ROBindTry
+
+	n[Chmod] = make([][2]string, 0, len(c.Chmod))
+	for path, octal := range c.Chmod {
+		n[Chmod] = append(n[Chmod], [2]string{strconv.Itoa(int(octal)), path})
+	}
+
+	return
+}