Extract WireGuardGo version at build time.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Scripts/extract_wireguard_go_version.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+sed=$(sh /etc/profile; which sed)
+wireguard_go_version=$("$sed" -n 's/.*WireGuardGoVersion = "\(.*\)\".*/\1/p' wireguard-go/version.go)
+
+target_plist="$TARGET_BUILD_DIR/$INFOPLIST_PATH"
+dsym_plist="$DWARF_DSYM_FOLDER_PATH/$DWARF_DSYM_FILE_NAME/Contents/Info.plist"
+
+for plist in "$target_plist" "$dsym_plist"; do
+  if [ -f "$plist" ]; then
+    echo $wireguard_go_version
+    /usr/libexec/PlistBuddy -c "Set :WireGuardGoVersion $wireguard_go_version" "$plist"
+  fi
+done
+
+settings_root_plist="$TARGET_BUILD_DIR/WireGuard.app/Settings.bundle/Root.plist"
+
+if [ -f "$settings_root_plist" ]; then
+  /usr/libexec/PlistBuddy -c "Set :PreferenceSpecifiers:2:DefaultValue $wireguard_go_version" "$settings_root_plist"
+else
+  echo "Could not find: $settings_root_plist"
+  exit 1
+fi