testing version of LuaBIOS and OpenOS

people were having issues getting them to work so now we promote consistency

data/OpenOS/lib/core/device_labeling.lua

@@ -0,0 +1,101 @@
+local fs = require("filesystem")
+
+local lib = {}
+
+local rules_path = "/etc/udev/rules.d/"
+local auto_rules = "autogenerated.lua"
+
+local function fs_key(dir, filename)
+  local long_name = dir .. '/' .. filename
+  local segments = fs.segments(long_name)
+  local result = '/' .. table.concat(segments, '/')
+  return result
+end
+
+function lib.loadRules(root_dir)
+  checkArg(1, root_dir, "string", "nil")
+  root_dir = (root_dir or rules_path)
+  lib.rules = {}
+  lib.rules[fs_key(root_dir, auto_rules)] = {}
+
+  for file in fs.list(root_dir) do
+    if file:match("%.lua$") then
+      local path = fs_key(root_dir, file)
+      local file_handle = io.open(path)
+      if file_handle then
+        local load_rule = load("return {" .. file_handle:read("*a") .. "}")
+        file_handle:close()
+        if load_rule then
+          local ok, rule = pcall(load_rule)
+          if ok and type(rule) == "table" then
+            local irule = {}
+            lib.rules[path] = irule
+            for _,v in ipairs(rule) do
+              if type(v) == "table" then
+                table.insert(irule, v)
+              end
+              -- else invalid rule
+            end
+          end
+        end
+      end
+    end
+  end
+end
+
+function lib.saveRule(rule_set, path)
+  checkArg(1, rule_set, "table")
+  checkArg(2, path, "string")
+  local file = io.open(path, "w")
+  if not file then return end -- fs may be read only, totally fine, this just won't persist
+  for index, irule in ipairs(rule_set) do
+    file:write(require("serialization").serialize(irule), ",\n")
+  end
+  file:close()
+end
+
+function lib.saveRules(rules)
+  for path, rule_set in pairs(rules) do
+    lib.saveRule(rule_set, path)
+  end
+end
+
+local function getIRule(proxy)
+  checkArg(1, proxy, "table")
+  for path,rule_set in pairs(lib.rules) do
+    for index, irule in ipairs(rule_set) do
+      if irule.address == proxy.address then
+        return irule, index, rule_set, path
+      end
+    end
+  end
+end
+
+function lib.getDeviceLabel(proxy)
+  local irule = getIRule(proxy)
+  if irule and irule.label then
+    return irule.label
+  elseif proxy.getLabel then
+    return proxy.getLabel()
+  end
+end
+
+function lib.setDeviceLabel(proxy, label)
+  local irule, index, rule_set, path = getIRule(proxy)
+  if not irule then
+    -- if the device supports labels, use it instead
+    if proxy.setLabel then
+      return proxy.setLabel(label)
+    end
+    path = fs_key(rules_path, auto_rules)
+    rule_set = lib.rules[path]
+    index = #rule_set + 1
+    irule = {address=proxy.address}
+    table.insert(rule_set, irule)
+  end
+  irule.label = label
+  lib.saveRule(rule_set, path)
+end
+
+return lib
+