btrfs-progs: factor out builtin feature string

We have more optionally built features, like compression for mkfs and
want to print that too. Factor out the common code.

Signed-off-by: David Sterba <[email protected]>

Author: kdave

btrfs.c

@@ -221,62 +221,7 @@ static const char * const cmd_version_usage[] = {
 
 static int cmd_version(const struct cmd_struct *unused, int argc, char **argv)
 {
-	static const char *features[] = {
-#if EXPERIMENTAL
-		"+"
-#else
-		"-"
-#endif
-		"EXPERIMENTAL",
-#ifdef INJECT
-		"+"
-#else
-		"-"
-#endif
-		"INJECT",
-#ifdef STATIC_BUILD
-		"+"
-#else
-		"-"
-#endif
-		"STATIC",
-#if defined(COMPRESSION_LZO) && COMPRESSION_LZO == 1
-		"+"
-#else
-		"-"
-#endif
-		"LZO",
-#if defined(COMPRESSION_ZSTD) && COMPRESSION_ZSTD == 1
-		"+"
-#else
-		"-"
-#endif
-		"ZSTD",
-#if defined(HAVE_LIBUDEV) && HAVE_LIBUDEV == 1
-		"+"
-#else
-		"-"
-#endif
-		"UDEV",
-#if defined(HAVE_LINUX_FSVERITY_H) && HAVE_LINUX_FSVERITY_H == 1
-		"+"
-#else
-		"-"
-#endif
-		"FSVERITY",
-#if defined(BTRFS_ZONED) && BTRFS_ZONED == 1
-		"+"
-#else
-		"-"
-#endif
-		"ZONED",
-		"CRYPTO=" CRYPTOPROVIDER,
-	};
-
-	printf("%s\n", PACKAGE_STRING);
-	for (int i = 0; i < ARRAY_SIZE(features); i++)
-		printf("%s%s", (i == 0 ? "" : " "), features[i]);
-	putchar('\n');
+	help_builtin_features("");
 	return 0;
 }
 static DEFINE_SIMPLE_COMMAND(version, "version");

common/help.c

@@ -540,3 +540,62 @@ void help_command_group(const struct cmd_group *grp, int argc, char **argv)
 	usage_command_group(grp, full, false);
 }
 
+void help_builtin_features(const char *prefix)
+{
+	static const char *features[] = {
+#if EXPERIMENTAL
+		"+"
+#else
+		"-"
+#endif
+		"EXPERIMENTAL",
+#ifdef INJECT
+		"+"
+#else
+		"-"
+#endif
+		"INJECT",
+#ifdef STATIC_BUILD
+		"+"
+#else
+		"-"
+#endif
+		"STATIC",
+#if defined(COMPRESSION_LZO) && COMPRESSION_LZO == 1
+		"+"
+#else
+		"-"
+#endif
+		"LZO",
+#if defined(COMPRESSION_ZSTD) && COMPRESSION_ZSTD == 1
+		"+"
+#else
+		"-"
+#endif
+		"ZSTD",
+#if defined(HAVE_LIBUDEV) && HAVE_LIBUDEV == 1
+		"+"
+#else
+		"-"
+#endif
+		"UDEV",
+#if defined(HAVE_LINUX_FSVERITY_H) && HAVE_LINUX_FSVERITY_H == 1
+		"+"
+#else
+		"-"
+#endif
+		"FSVERITY",
+#if defined(BTRFS_ZONED) && BTRFS_ZONED == 1
+		"+"
+#else
+		"-"
+#endif
+		"ZONED",
+		"CRYPTO=" CRYPTOPROVIDER,
+	};
+
+	printf("%s%s\n", prefix, PACKAGE_STRING);
+	for (int i = 0; i < ARRAY_SIZE(features); i++)
+		printf("%s%s", (i == 0 ? "" : " "), features[i]);
+	putchar('\n');
+}

common/help.h

@@ -115,6 +115,7 @@ __attribute__((noreturn))
 void help_ambiguous_token(const char *arg, const struct cmd_group *grp);
 
 void help_command_group(const struct cmd_group *grp, int argc, char **argv);
+void help_builtin_features(const char *prefix);
 
 int check_argc_exact(int nargs, int expected);
 int check_argc_min(int nargs, int expected);