libnm-glib-aux: move nm_keyfile_add_group()

Move nm_keyfile_add_group() to libnm-glib-aux so that it can be used
by other components such as nm-initrd-generator. Rename it to
nm_key_file_add_group() to be consistent with the GLib API names
(g_key_file_*()).

src/libnm-core-impl/nm-keyfile-utils.c

@@ -682,22 +682,3 @@ nm_keyfile_key_decode(const char *key, char **out_to_free)
 #endif
     return name;
 }
-
-void
-nm_keyfile_add_group(GKeyFile *keyfile, const char *group)
-{
-    nm_assert(keyfile);
-    nm_assert(group);
-
-    /* You can only call this function if the group doesn't exist yet.
-     * Because, we are about to add a dummy key, so we would have to
-     * be sure that the key doesn't exist. */
-    nm_assert(!g_key_file_has_group(keyfile, group));
-
-    /* Ensure the group is present.
-     * There is no API for that, so add and remove a dummy key.
-     * For a profile it matters whether a setting is present or not,
-     * and we need to ensure that we persist the presence of the setting to keyfile*/
-    g_key_file_set_value(keyfile, group, ".X", "1");
-    g_key_file_remove_key(keyfile, group, ".X", NULL);
-}

src/libnm-core-impl/nm-keyfile.c

@@ -18,6 +18,7 @@
 #include <linux/if_ether.h>
 #include <linux/if_infiniband.h>
 
+#include "libnm-glib-aux/nm-keyfile-aux.h"
 #include "libnm-glib-aux/nm-uuid.h"
 #include "libnm-glib-aux/nm-str-buf.h"
 #include "libnm-glib-aux/nm-secret-utils.h"
@@ -2502,7 +2503,7 @@ wired_s390_options_writer_full(KeyfileWriterInfo        *info,
         /* groups in the keyfile are ordered. When we are about to add [ethernet-s390-options],
          * we want to also have an [ethernet] group, first. */
 
-        nm_keyfile_add_group(info->keyfile, setting_alias ?: NM_SETTING_WIRED_SETTING_NAME);
+        nm_key_file_add_group(info->keyfile, setting_alias ?: NM_SETTING_WIRED_SETTING_NAME);
     }
 
     for (i = 0; i < n; i++) {
@@ -4475,7 +4476,7 @@ nm_keyfile_write(NMConnection         *connection,
             || g_key_file_has_group(info.keyfile, setting_name)) {
             /* we have a section for the setting. Nothing to do. */
         } else {
-            nm_keyfile_add_group(info.keyfile, setting_alias ?: setting_name);
+            nm_key_file_add_group(info.keyfile, setting_alias ?: setting_name);
         }
 
         if (NM_IS_SETTING_WIREGUARD(setting)) {

src/libnm-core-intern/nm-keyfile-utils.h

@@ -88,6 +88,4 @@ const char *nm_keyfile_key_encode(const char *name, char **out_to_free);
 
 const char *nm_keyfile_key_decode(const char *key, char **out_to_free);
 
-void nm_keyfile_add_group(GKeyFile *keyfile, const char *group);
-
 #endif /* __NM_KEYFILE_UTILS_H__ */

src/libnm-glib-aux/nm-keyfile-aux.c

@@ -485,3 +485,22 @@ nm_key_file_db_prune(NMKeyFileDB *self,
         }
     }
 }
+
+void
+nm_key_file_add_group(GKeyFile *keyfile, const char *group)
+{
+    nm_assert(keyfile);
+    nm_assert(group);
+
+    /* You can only call this function if the group doesn't exist yet.
+     * Because, we are about to add a dummy key, so we would have to
+     * be sure that the key doesn't exist. */
+    nm_assert(!g_key_file_has_group(keyfile, group));
+
+    /* Ensure the group is present.
+     * There is no API for that, so add and remove a dummy key.
+     * For a profile it matters whether a setting is present or not,
+     * and we need to ensure that we persist the presence of the setting to keyfile*/
+    g_key_file_set_value(keyfile, group, ".X", "1");
+    g_key_file_remove_key(keyfile, group, ".X", NULL);
+}

src/libnm-glib-aux/nm-keyfile-aux.h

@@ -58,4 +58,6 @@ void nm_key_file_db_prune(NMKeyFileDB *self,
 
 /*****************************************************************************/
 
+void nm_key_file_add_group(GKeyFile *keyfile, const char *group);
+
 #endif /* __NM_KEYFILE_AUX_H__ */