nmtui/bond: introduce "other options" list

Bond connections can have options that are not exposed by any widget
in the bond editor. The presence of certain mode-specific options makes
it impossible to change the mode, e.g. from 802.3ad to active-backup
when `lacp_rate` is set.

Introduce an "Other options" list that shows all bond options not
already configurable by a specific widget, and allow the user to edit
them as key=value entries.

Resolves #1805
Resolves: https://redhat.atlassian.net/browse/NMT-1888

NEWS

@@ -61,6 +61,9 @@ USE AT YOUR OWN RISK.  NOT RECOMMENDED FOR PRODUCTION USE!
 * Allow persisting the managed state across reboots from nmcli and the D-Bus API.
 * Allow changing the device's administrative state in the kernel at the same
   time as a change to the managed state from nmcli and the D-Bus API.
+* Allow configuring all bond options in nmtui by introducing a
+  "other options" field, which covers options not already covered by a
+  dedicated input field.
 
 =============================================
 NetworkManager-1.56

src/nmtui/nmt-address-list.c

@@ -5,14 +5,13 @@
 
 /**
  * SECTION:nmt-address-list
- * @short_description: An editable list of IP addresses or hostnames
+ * @short_description: An editable list of IP addresses, hostnames, or key=value pairs
  *
  * #NmtAddressList is a subclass of #NmtWidgetList that contains
- * entries displaying IP addresses, address/prefix strings, or
- * hostnames. This is designed for binding its #NmtAddressList:strings
- * property to an appropriate #NMSettingIP4Config or
- * #NMSettingIP6Config property via one of the nm-editor-bindings
- * functions.
+ * entries displaying IP addresses, address/prefix strings,
+ * hostnames, or key=value pairs. This is designed for binding its
+ * #NmtAddressList:strings property to an appropriate property via one
+ * of the nm-editor-bindings functions.
  */
 
 #include "libnm-client-aux-extern/nm-default-client.h"
@@ -115,6 +114,18 @@ hostname_filter(NmtNewtEntry *entry, const char *text, int ch, int position, gpo
     return g_ascii_isalnum(ch) || ch == '.' || ch == '-' || ch == '~';
 }
 
+static gboolean
+key_value_validate(NmtNewtEntry *entry, const char *text, gpointer user_data)
+{
+    const char *val;
+
+    if (!text || !text[0])
+        return TRUE;
+
+    val = strchr(text, '=');
+    return val && val != text && val[1];
+}
+
 static NmtNewtWidget *
 nmt_address_list_create_widget(NmtWidgetList *list, int num)
 {
@@ -132,6 +143,9 @@ nmt_address_list_create_widget(NmtWidgetList *list, int num)
     } else if (priv->list_type == NMT_ADDRESS_LIST_HOSTNAME) {
         entry = nmt_newt_entry_new(25, NMT_NEWT_ENTRY_NONEMPTY);
         nmt_newt_entry_set_filter(NMT_NEWT_ENTRY(entry), hostname_filter, list);
+    } else if (priv->list_type == NMT_ADDRESS_LIST_KEY_VALUE) {
+        entry = nmt_newt_entry_new(40, 0);
+        nmt_newt_entry_set_validator(NMT_NEWT_ENTRY(entry), key_value_validate, NULL);
     } else {
         g_return_val_if_reached(NULL);
     }

src/nmtui/nmt-address-list.h

@@ -35,7 +35,8 @@ typedef enum {
     NMT_ADDRESS_LIST_IP4,
     NMT_ADDRESS_LIST_IP6_WITH_PREFIX,
     NMT_ADDRESS_LIST_IP6,
-    NMT_ADDRESS_LIST_HOSTNAME
+    NMT_ADDRESS_LIST_HOSTNAME,
+    NMT_ADDRESS_LIST_KEY_VALUE
 } NmtAddressListType;
 
 NmtNewtWidget *nmt_address_list_new(NmtAddressListType list_type);

src/nmtui/nmt-page-bond.c

@@ -49,6 +49,7 @@ typedef struct {
     NmtNewtEntry   *downdelay;
     NmtNewtEntry   *arp_interval;
     NmtAddressList *arp_ip_target;
+    NmtAddressList *other_options;
 
     NmtPageBondMonitoringMode monitoring_mode;
 
@@ -63,6 +64,43 @@ static void arp_ip_target_widget_changed(GObject *object, GParamSpec *pspec, gpo
 
 /*****************************************************************************/
 
+static gboolean
+_is_other_option(const char *option)
+{
+    return !NM_IN_STRSET(option,
+                         NM_SETTING_BOND_OPTION_MODE,
+                         NM_SETTING_BOND_OPTION_PRIMARY,
+                         NM_SETTING_BOND_OPTION_MIIMON,
+                         NM_SETTING_BOND_OPTION_UPDELAY,
+                         NM_SETTING_BOND_OPTION_DOWNDELAY,
+                         NM_SETTING_BOND_OPTION_ARP_INTERVAL,
+                         NM_SETTING_BOND_OPTION_ARP_IP_TARGET);
+}
+
+static void
+_bond_update_other_options(NMSettingBond *s_bond, NmtAddressList *list)
+{
+    gs_unref_ptrarray GPtrArray *arr      = g_ptr_array_new_with_free_func(g_free);
+    guint                        num_opts = nm_setting_bond_get_num_options(s_bond);
+    guint                        i;
+
+    for (i = 0; i < num_opts; i++) {
+        const char *opt_name;
+        const char *opt_value;
+
+        nm_assert(nm_setting_bond_get_option(s_bond, i, &opt_name, &opt_value));
+
+        if (_is_other_option(opt_name)) {
+            g_ptr_array_add(arr, g_strdup_printf("%s=%s", opt_name, opt_value));
+        }
+    }
+
+    g_ptr_array_add(arr, NULL);
+    g_object_set(G_OBJECT(list), "strings", arr->pdata, NULL);
+}
+
+/*****************************************************************************/
+
 NmtEditorPage *
 nmt_page_bond_new(NMConnection *conn, NmtDeviceEntry *deventry)
 {
@@ -155,6 +193,8 @@ bond_options_changed(GObject *object, GParamSpec *pspec, gpointer user_data)
     nmt_newt_widget_set_visible(NMT_NEWT_WIDGET(priv->arp_interval), !visible_mii);
     nmt_newt_widget_set_visible(NMT_NEWT_WIDGET(priv->arp_ip_target), !visible_mii);
 
+    _bond_update_other_options(s_bond, priv->other_options);
+
     priv->updating = FALSE;
 }
 
@@ -308,6 +348,47 @@ arp_ip_target_widget_changed(GObject *object, GParamSpec *pspec, gpointer user_d
     g_strfreev(ips);
 }
 
+static void
+other_options_widget_changed(GObject *object, GParamSpec *pspec, gpointer user_data)
+{
+    NmtPageBond        *bond          = NMT_PAGE_BOND(user_data);
+    NmtPageBondPrivate *priv          = NMT_PAGE_BOND_GET_PRIVATE(bond);
+    gs_strfreev char  **other_options = NULL;
+    const char         *name;
+    guint               num;
+    guint               i;
+
+    if (priv->updating)
+        return;
+
+    priv->updating = TRUE;
+
+    g_object_get(G_OBJECT(priv->other_options), "strings", &other_options, NULL);
+
+again:
+    num = nm_setting_bond_get_num_options(priv->s_bond);
+    for (i = 0; i < num; i++) {
+        nm_assert(nm_setting_bond_get_option(priv->s_bond, i, &name, NULL));
+
+        if (_is_other_option(name)) {
+            nm_setting_bond_remove_option(priv->s_bond, name);
+            goto again;
+        }
+    }
+
+    for (i = 0; other_options && other_options[i]; i++) {
+        char *val = strchr(other_options[i], '=');
+
+        if (val && val != other_options[i] && val[1]) {
+            *val = '\0';
+            if (_is_other_option(other_options[i]))
+                nm_setting_bond_add_option(priv->s_bond, other_options[i], val + 1);
+        }
+    }
+
+    priv->updating = FALSE;
+}
+
 static gboolean
 bond_connection_type_filter(GType connection_type, gpointer user_data)
 {
@@ -395,6 +476,11 @@ nmt_page_bond_constructed(GObject *object)
     nmt_editor_grid_append(grid, _("ARP targets"), widget, NULL);
     priv->arp_ip_target = NMT_ADDRESS_LIST(widget);
 
+    widget = nmt_address_list_new(NMT_ADDRESS_LIST_KEY_VALUE);
+    g_signal_connect(widget, "notify::strings", G_CALLBACK(other_options_widget_changed), bond);
+    nmt_editor_grid_append(grid, _("Other options (key=value)"), widget, NULL);
+    priv->other_options = NMT_ADDRESS_LIST(widget);
+
     widget = nmt_mac_entry_new(40, ETH_ALEN, NMT_MAC_ENTRY_TYPE_CLONED_ETHERNET);
     g_object_bind_property(s_wired,
                            NM_SETTING_WIRED_CLONED_MAC_ADDRESS,