vere: adds -a/--arch option to next subcommand

pkg/urbit/daemon/main.c

@@ -1304,27 +1304,51 @@ _cw_meld(c3_i argc, c3_c* argv[])
   u3m_stop();
 }
 
-/* _cw_next(); request upgrade
+/* _cw_next(): request upgrade
 */
 static void
 _cw_next(c3_i argc, c3_c* argv[])
 {
-  switch ( argc ) {
-    case 2: {
-      if ( !(u3_Host.dir_c = _main_pier_run(argv[0])) ) {
-        fprintf(stderr, "unable to find pier\r\n");
-        exit (1);
-      }
-    } break;
+  c3_i ch_i, lid_i;
+  c3_w arg_w;
 
-    case 3: {
-      u3_Host.dir_c = argv[2];
-    } break;
+  static struct option lop_u[] = {
+    { "arch",                required_argument, NULL, 'a' },
+    { NULL, 0, NULL, 0 }
+  };
 
-    default: {
-      fprintf(stderr, "invalid command\r\n");
+  u3_Host.dir_c = _main_pier_run(argv[0]);
+
+  while ( -1 != (ch_i=getopt_long(argc, argv, "a:", lop_u, &lid_i)) ) {
+    switch ( ch_i ) {
+      case 'a': {
+        u3_Host.arc_c = strdup(optarg);
+      } break;
+
+      case '?': {
+        exit(1);
+      } break;
+    }
+  }
+
+  //  argv[optind] is always "next"
+  //
+
+  if ( !u3_Host.dir_c ) {
+    if ( optind + 1 < argc ) {
+      u3_Host.dir_c = argv[optind + 1];
+    }
+    else {
+      fprintf(stderr, "invalid command, pier required\r\n");
       exit(1);
-    } break;
+    }
+
+    optind++;
+  }
+
+  if ( optind + 1 != argc ) {
+    fprintf(stderr, "invalid command\r\n");
+    exit(1);
   }
 
   u3_Host.pep_o = c3y;

pkg/urbit/include/vere/vere.h

@@ -328,6 +328,7 @@
 #endif
         u3_utty*   uty_u;                   //  linked terminal list
         c3_o       nex_o;                   //  upgrade requested
+        c3_c*      arc_c;                   //  upgrade to arch
         u3_opts    ops_u;                   //  commandline options
         c3_o       pep_o;                   //  prep for upgrade
         c3_i       xit_i;                   //  exit code for shutdown

pkg/urbit/vere/king.c

@@ -1375,10 +1375,13 @@ _king_do_upgrade(c3_c* pac_c, c3_c* ver_c)
 #ifdef U3_OS_ARCH
   arc_c = U3_OS_ARCH;
 #else
-  //  XX support arch argument
-  //
-  u3l_log("vere: arch required\r\n");
-  return;
+  if ( u3_Host.arc_c ) {
+    arc_c = u3_Host.arc_c;
+  }
+  else {
+    u3l_log("vere: arch required\r\n");
+    return;
+  }
 #endif
 
   //  XX get link option