[usersq] add warnings for forbidden names

root & localhost set as forbidden in loginname & hostname

src/modules/usersq/usersq.qml

@@ -77,9 +77,9 @@ Kirigami.ScrollablePage {
                 placeholderText: qsTr("Login Name")
                 text: config.loginName
                 validator: RegularExpressionValidator { regularExpression: /[a-z_][a-z0-9_-]*[$]?$/ }
-                onTextChanged: acceptableInput ? ( config.setLoginName(text),userMessage.visible = false ) : ( userMessage.visible = true,console.log("Invalid") )
+                onTextChanged: acceptableInput ? ( _userLoginField.text === "root" ? forbiddenMessage.visible=true : ( config.setLoginName(text),userMessage.visible = false,forbiddenMessage.visible=false ) ) : ( userMessage.visible = true,console.log("Invalid") )
 
-                palette.base: _userLoginField.text.length ? "#f0fff0" : "#FBFBFB"
+                palette.base: _userLoginField.text.length ? ( acceptableInput ? ( _userLoginField.text === "root" ? "#ffdae0" : "#f0fff0" ) : "#ffdae0") : "#FBFBFB"
                 palette.highlight : _userLoginField.text.length ? "#dcffdc" : "#FBFBFB"
             }
 
@@ -97,7 +97,15 @@ Kirigami.ScrollablePage {
             Layout.fillWidth: true
             visible: false
             type: Kirigami.MessageType.Error
-            text: qsTr("Your username must start with a lowercase letter or underscore, minimal of two characters.")
+            text: qsTr("Only lowercase letters, numbers, underscore and hyphen are allowed.")
+        }
+
+        Kirigami.InlineMessage {
+            id: forbiddenMessage
+            Layout.fillWidth: true
+            visible: false
+            type: Kirigami.MessageType.Error
+            text: qsTr("root is not allowed as username.")
         }
 
         Column {
@@ -115,9 +123,9 @@ Kirigami.ScrollablePage {
                 placeholderText: qsTr("Computer Name")
                 text: config.hostName
                 validator: RegularExpressionValidator { regularExpression: /[a-zA-Z0-9][-a-zA-Z0-9_]+/ }
-                onTextChanged: acceptableInput ? (config.setHostName(text),hostMessage.visible = false) : hostMessage.visible = true
+                onTextChanged: acceptableInput ? ( _hostName.text === "localhost" ? forbiddenHost.visible=true : (config.setHostName(text),hostMessage.visible = false,forbiddenHost.visible = false) ) : hostMessage.visible = true
 
-                palette.base: _hostName.text.length ? ( acceptableInput ? "#f0fff0" : "#ffdae0") : "#FBFBFB"
+                palette.base: _hostName.text.length ? ( acceptableInput ? ( _hostName.text === "localhost" ? "#ffdae0" : "#f0fff0" ) : "#ffdae0") : "#FBFBFB"
                 palette.highlight : _hostName.text.length ? "#dcffdc" : "#FBFBFB"
             }
 
@@ -138,6 +146,14 @@ Kirigami.ScrollablePage {
             text: qsTr("Only letter, numbers, underscore and hyphen are allowed, minimal of two characters.")
         }
 
+        Kirigami.InlineMessage {
+            id: forbiddenHost
+            Layout.fillWidth: true
+            visible: false
+            type: Kirigami.MessageType.Error
+            text: qsTr("localhost is not allowed as hostname.")
+        }
+
         Column {
             Layout.fillWidth: true
             spacing: Kirigami.Units.smallSpacing
@@ -251,6 +267,7 @@ Kirigami.ScrollablePage {
                     text: config.rootPasswordSecondary
                     //onTextChanged: config.setRootPasswordSecondary(text)
                     onTextChanged: _rootPasswordField.text === _verificationRootPasswordField.text ? (config.setRootPasswordSecondary(text),rootPassMessage.visible = false) : rootPassMessage.visible = true
+
                     palette.base: _verificationRootPasswordField.text.length ? ( _rootPasswordField.text === _verificationRootPasswordField.text ? "#f0fff0" : "#ffdae0") : "#FBFBFB"
                     palette.highlight : _verificationRootPasswordField.text.length ? "#dcffdc" : "#FBFBFB"