core: merge branch 'af/settings-add-matches' (part 1)

https://gitlab.freedesktop.org/afreof/NetworkManager/-/tree/af/settings-add-matches

shared/nm-glib-aux/nm-macros-internal.h

@@ -1479,7 +1479,12 @@ _NM_BACKPORT_SYMBOL_IMPL(version, return_type, func, _##func##_##version, args_t
 /*****************************************************************************/
 
 /* mirrors g_ascii_isspace() and what we consider spaces in general. */
-#define NM_ASCII_SPACES "\t\n\f\r "
+#define NM_ASCII_SPACES      " \n\t\r\f"
+
+/* Like NM_ASCII_SPACES, but without "\f" (0x0c, Formfeed Page Break).
+ * This is what for example systemd calls WHITESPACE and what it uses to tokenize
+ * the kernel command line. */
+#define NM_ASCII_WHITESPACES " \n\t\r"
 
 #define nm_str_skip_leading_spaces(str) \
 	({ \

src/nm-core-utils.c

@@ -2741,6 +2741,59 @@ nm_utils_boot_id_bin (void)
 
 /*****************************************************************************/
 
+const char *
+nm_utils_proc_cmdline (void)
+{
+	static const char *volatile proc_cmdline_cached = NULL;
+	const char *proc_cmdline;
+
+again:
+	proc_cmdline = g_atomic_pointer_get (&proc_cmdline_cached);
+	if (G_UNLIKELY (!proc_cmdline)) {
+		gs_free char *str = NULL;
+
+		g_file_get_contents ("/proc/cmdline", &str, NULL, NULL);
+		str = nm_str_realloc (str);
+
+		proc_cmdline = str ?: "";
+		if (!g_atomic_pointer_compare_and_exchange (&proc_cmdline_cached, NULL, proc_cmdline))
+			goto again;
+
+		g_steal_pointer (&str);
+	}
+
+	return proc_cmdline;
+}
+
+const char *const*
+nm_utils_proc_cmdline_split (void)
+{
+	static const char *const*volatile proc_cmdline_cached = NULL;
+	const char *const*proc_cmdline;
+
+again:
+	proc_cmdline = g_atomic_pointer_get (&proc_cmdline_cached);
+	if (G_UNLIKELY (!proc_cmdline)) {
+		gs_free const char **split = NULL;
+
+		/* TODO: support quotation, like systemd's proc_cmdline_extract_first().
+		 * For that, add a new NMUtilsStrsplitSetFlags flag. */
+		split = nm_utils_strsplit_set_full (nm_utils_proc_cmdline (),
+		                                    NM_ASCII_WHITESPACES,
+		                                    NM_UTILS_STRSPLIT_SET_FLAGS_NONE);
+		proc_cmdline =    split
+		               ?: NM_PTRARRAY_EMPTY (const char *);
+		if (!g_atomic_pointer_compare_and_exchange (&proc_cmdline_cached, NULL, proc_cmdline))
+			goto again;
+
+		g_steal_pointer (&split);
+	}
+
+	return proc_cmdline;
+}
+
+/*****************************************************************************/
+
 /**
  * nm_utils_arp_type_detect_from_hwaddrlen:
  * @hwaddr_len: the length of the hardware address in bytes.

src/nm-core-utils.h

@@ -267,6 +267,8 @@ gboolean nm_utils_machine_id_is_fake (void);
 
 const char *nm_utils_boot_id_str (void);
 const struct _NMUuid *nm_utils_boot_id_bin (void);
+const char *nm_utils_proc_cmdline (void);
+const char *const*nm_utils_proc_cmdline_split (void);
 
 gboolean nm_utils_host_id_get (const guint8 **out_host_id,
                                gsize *out_host_id_len);