pb-event: Add help message

[petitboot] / utils / pb-event.c

diff --git a/utils/pb-event.c b/utils/pb-event.c
index 5ef811513c0eea5c079136ed9be02d4ea6ebf6fa..a119e21b24622545f99b3648510c36bcaac3dd7c 100644 (file)
--- a/utils/pb-event.c
+++ b/utils/pb-event.c
@@ -40,7 +40,31 @@ static inline int __attribute__ ((format (printf, 1, 2))) DBG(
        __attribute__((unused)) const char *fmt, ...) {return 0; }
 #endif
 
-int main(void)
+static void print_version(void)
+{
+       printf("pb-event (" PACKAGE_NAME ") " PACKAGE_VERSION "\n");
+}
+
+static void print_usage(void)
+{
+       print_version();
+       printf(
+"Usage: pb-event [-h, --help] [-V, --version]\n"
+"\n"
+"       Reads a single petitboot user event on stdin and forwards it to the\n"
+"       petitboot discover server pb-discover.  User events must have the\n"
+"       following format:\n"
+"\n"
+"         (add|remove)@device-id\\0[name=value\\0][image=value\\0][args=value\\0]\n"
+"\n"
+"Examples:\n"
+"\n"
+"       echo -ne 'add@/net/eth0\\0name=netboot\\0image=tftp://192.168.1.10/vmlinux\\0args=root=/dev/nfs nfsroot=192.168.1.10:/target\\0' | pb-event\n"
+"       echo -ne 'remove@/net/eth0\\0' | pb-event\n"
+"\n");
+}
+
+int main(int argc, __attribute__((unused)) char *argv[])
 {
        int result;
        struct sockaddr_un addr;
@@ -48,7 +72,12 @@ int main(void)
        ssize_t len;
        int s;
        int i;
-
+       
+       if (argc > 1) {
+               print_usage();
+               return EXIT_FAILURE;
+       }
+       
        s = socket(PF_UNIX, SOCK_DGRAM, 0);
 
        if (s < 0) {
@@ -62,7 +91,7 @@ int main(void)
 
        if (!feof(stdin)) {
                fprintf(stderr, "pb-event: msg too big (%u byte max)\n",
-                       sizeof(buf));
+                       (unsigned int)sizeof(buf));
                result = EXIT_FAILURE;
                /* continue on and try to write msg */
        }
@@ -90,6 +119,6 @@ int main(void)
                return EXIT_FAILURE;
        }
 
-       DBG("pb-event: wrote %u bytes\n", len);
+       DBG("pb-event: wrote %u bytes\n", (unsigned int)len);
        return result;
 }