Add cmirror --version

cmirror.c

@@ -26,6 +26,8 @@
 #include <ctype.h>
 #include <getopt.h>
 
+#define CMIRROR_VERSION "v1.7"
+
 // http://owww.molgen.mpg.de/~buczek/glib-doc/
 
 #include <glib.h>
@@ -570,6 +572,7 @@ static void usage(char *argv0) {
     fprintf(stderr,
         "usage: %s [options] path [node:]path\n"
         "       %s --slave [--local-slave] [--socket-name path] [options] path\n"
+        "       %s --version\n"
         "\n"
         " options:\n"
         "   --noop               dont change anything\n"
@@ -594,7 +597,7 @@ static void usage(char *argv0) {
         "   --socket-name PATH   EXPERIMENTAL use PATH as name for AF unix sockets\n"
         "   --noatime            don't touch atime on sender\n"
         "   --ignore-permissions do not attempt to change file permissions\n",
-        argv0, argv0);
+        argv0, argv0, argv0);
     _exit(1);
 }
 
@@ -624,6 +627,7 @@ static struct option options[] = {
     { "socket-name",    1, NULL,                104 },
     { "noatime",        0, &noatime,            1 },
     { "ignore-permissions",  0, &ignore_permissions,       1 },
+    { "version",        0, NULL,                105 },
     { NULL }
 };
 
@@ -1478,7 +1482,10 @@ int main(int argc, char **argv) {
             g_strv_builder_add(ssh_opts_builder, optarg);
         else if (opt == 104)
             unix_socket_name = g_strdup(optarg);
-        else if (opt == '?')
+        else if (opt == 105) {
+            printf("cmirror version " CMIRROR_VERSION "\n");
+            exit(0);
+        } else if (opt == '?')
             usage(argv0);
         else
             die("internal error: getopt returned %d\n", opt);