agetty: add compile time features to --version output

This command has a lot of compile time #ifdef code.  It is time to add
feature listing to --version output so understanding command behavior is
easier.

Proposed-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>

diff --git a/term-utils/agetty.c b/term-utils/agetty.c
index b67c2d0ff611fd20c056d8f304627d45ed13e17a..732a46838d8f90cb25be17a533ab48375f7885c4 100644 (file)
--- a/term-utils/agetty.c
+++ b/term-utils/agetty.c
@@ -617,6 +617,50 @@ static void login_options_to_argv(char *argv[], int *argc,
        *argc = i;
 }
 
+static void output_version(void)
+{
+       static const char *features[] = {
+#ifdef DEBUGGING
+               "debug",
+#endif
+#ifdef CRTSCTS
+               "flow control",
+#endif
+#ifdef KDGKBLED
+               "hints",
+#endif
+#ifdef ISSUE
+               "issue",
+#endif
+#ifdef KDGKBMODE
+               "keyboard mode",
+#endif
+#ifdef USE_PLYMOUTH_SUPPORT
+               "plymouth",
+#endif
+#ifdef AGETTY_RELOAD
+               "reload",
+#endif
+#ifdef USE_SYSLOG
+               "syslog",
+#endif
+#ifdef HAVE_WIDECHAR
+               "widechar",
+#endif
+               NULL
+       };
+       unsigned int i;
+
+       printf( _("%s from %s"), program_invocation_short_name, PACKAGE_STRING);
+       fputs(" (", stdout);
+       for (i = 0; features[i]; i++) {
+               if (0 < i)
+                       fputs(", ", stdout);
+               printf("%s", features[i]);
+       }
+       fputs(")\n", stdout);
+}
+
 #define is_speed(str) (strlen((str)) == strspn((str), "0123456789,"))
 
 /* Parse command-line arguments. */
@@ -790,7 +834,7 @@ static void parse_args(int argc, char **argv, struct options *op)
                case LIST_SPEEDS_OPTION:
                        list_speeds();
                case VERSION_OPTION:
-                       printf(UTIL_LINUX_VERSION);
+                       output_version();
                        exit(EXIT_SUCCESS);
                case HELP_OPTION:
                        usage();