uboot-envtools: add fw_loadenv tool

This tool will load the uboot environment to /var/run/uboot-env/. This allows
more efficient use when accessing multiple variables.

Signed-off-by: John Crispin <[email protected]>

package/boot/uboot-envtools/Makefile

@@ -71,6 +71,7 @@ define Package/uboot-envtools/install
 	$(LN) fw_printenv $(1)/usr/sbin/fw_setenv
 	$(INSTALL_BIN) ./files/fw_printsys $(1)/usr/sbin
 	$(INSTALL_BIN) ./files/fw_setsys $(1)/usr/sbin
+	$(INSTALL_BIN) ./files/fw_loadenv $(1)/usr/sbin
 	$(INSTALL_DIR) $(1)/lib
 	$(INSTALL_DATA) ./files/uboot-envtools.sh $(1)/lib
 	$(INSTALL_DIR) $(1)/etc/uci-defaults

package/boot/uboot-envtools/files/fw_loadenv

@@ -0,0 +1,26 @@
+#!/usr/bin/ucode
+
+'use strict';
+
+const path = '/var/run/uboot-env/';
+
+import * as fs from 'fs';
+
+if (fs.lsdir(path)) {
+	warn(`env has already been loaded to ${path}\n`);
+	exit(0);
+}
+
+let fp = fs.popen('fw_printenv');
+let raw = fp.read('all');
+fp.close();
+
+if (!length(raw))
+	exit(0);
+
+fs.mkdir(path);
+for (let line in split(raw, '\n')) {
+	let vals = split(line, '=');
+	if (vals[0] && vals[1])
+		fs.writefile(path + vals[0], vals[1]);
+}