udev: implement --version in all builtins

Those are separate binaries, and occasionally people will get a misplaced
binary that doesn't match the rest of the installed system and be confused, so
it good to be able to check the version. It is also nice to have the same
interface in all binaries.

Note that we usually use a separate 'enum ARG_VERSION = 0x100' for an option
without a short name. We can use a less verbose approach of simply taking any
unused letter, which works just as well and even the compiler would warn us
if we tried to use the letter in another place. This way we avoid a few lines
of boilerplate.

The help texts are adjusted to have an empty line between the synopsis and
option list, and no empty lines after the option list.

1 files changed, 11 insertions, 7 deletions

diff --git a/src/udev/cdrom_id/cdrom_id.c b/src/udev/cdrom_id/cdrom_id.c
index 3d58100f3e..5b5fbd0109 100644
--- a/src/udev/cdrom_id/cdrom_id.c
+++ b/src/udev/cdrom_id/cdrom_id.c
@@ -10,6 +10,7 @@
 #include <sys/ioctl.h>
 #include <unistd.h>
 
+#include "build.h"
 #include "fd-util.h"
 #include "main-func.h"
 #include "memory-util.h"
@@ -897,13 +898,13 @@ static void print_properties(const Context *c) {
 }
 
 static int help(void) {
-        printf("Usage: %s [options] <device>\n"
-               "  -l --lock-media    lock the media (to enable eject request events)\n"
-               "  -u --unlock-media  unlock the media\n"
-               "  -e --eject-media   eject the media\n"
-               "  -d --debug         print debug messages to stderr\n"
-               "  -h --help          print this help text\n"
-               "\n",
+        printf("%s [OPTIONS...] DEVICE\n\n"
+               "  -l --lock-media    Lock the media (to enable eject request events)\n"
+               "  -u --unlock-media  Unlock the media\n"
+               "  -e --eject-media   Eject the media\n"
+               "  -d --debug         Print debug messages to stderr\n"
+               "  -h --help          Show this help text\n"
+               "     --version       Show package version\n",
                program_invocation_short_name);
 
         return 0;
@@ -916,6 +917,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "eject-media",  no_argument, NULL, 'e' },
                 { "debug",        no_argument, NULL, 'd' },
                 { "help",         no_argument, NULL, 'h' },
+                { "version",      no_argument, NULL, 'v' },
                 {}
         };
         int c;
@@ -938,6 +940,8 @@ static int parse_argv(int argc, char *argv[]) {
                         break;
                 case 'h':
                         return help();
+                case 'v':
+                        return version();
                 case '?':
                         return -EINVAL;
                 default: