rbd: force all exiting paths through main()/return

This properly destroys objects.  In the process, remove usage_exit();
also kill error-handling in set_conf_param (never relevant for rbd.cc,
and if you call it with both pointers NULL, well...)
Also switch to EXIT_FAILURE for consistency.

Backported from fed8aea662bf919f35a5a72e4e2a2a685af2b2ed.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Fixes: #2948

1 files changed, 58 insertions, 58 deletions

diff --git a/src/rbd.cc b/src/rbd.cc
index 88e34079712..294292574c2 100644
--- a/src/rbd.cc
+++ b/src/rbd.cc
@@ -104,13 +104,6 @@ void usage()
        << "  --secret <path>              file containing secret key for use with cephx\n";
 }
 
-void usage_exit()
-{
-  assert(1);
-  usage();
-  exit(1);
-}
-
 static void print_info(const char *imgname, librbd::image_info_t& info)
 {
   cout << "rbd image '" << imgname << "':\n"
@@ -930,8 +923,6 @@ static void set_conf_param(const char *param, const char **var1, const char **va
     *var1 = param;
   else if (var2 && !*var2)
     *var2 = param;
-  else
-    usage_exit();
 }
 
 int main(int argc, const char **argv)
@@ -965,7 +956,7 @@ int main(int argc, const char **argv)
       break;
     } else if (ceph_argparse_flag(args, i, "-h", "--help", (char*)NULL)) {
       usage();
-      exit(0);
+      return 0;
     } else if (ceph_argparse_flag(args, i, "--new-format", (char*)NULL)) {
       old_format = false;
     } else if (ceph_argparse_witharg(args, i, &val, "-p", "--pool", (char*)NULL)) {
@@ -979,13 +970,13 @@ int main(int argc, const char **argv)
     } else if (ceph_argparse_withlonglong(args, i, &sizell, &err, "-s", "--size", (char*)NULL)) {
       if (!err.str().empty()) {
 	cerr << err.str() << std::endl;
-	exit(EXIT_FAILURE);
+	return EXIT_FAILURE;
       }
       size = sizell << 20;   // bytes to MB
     } else if (ceph_argparse_withint(args, i, &order, &err, "--order", (char*)NULL)) {
       if (!err.str().empty()) {
 	cerr << err.str() << std::endl;
-	exit(EXIT_FAILURE);
+	return EXIT_FAILURE;
       }
     } else if (ceph_argparse_witharg(args, i, &val, "--path", (char*)NULL)) {
       path = strdup(val.c_str());
@@ -1003,13 +994,15 @@ int main(int argc, const char **argv)
   i = args.begin();
   if (i == args.end()) {
     cerr << "you must specify a command." << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
   else if (strcmp(*i, "snap") == 0) {
     i = args.erase(i);
     if (i == args.end()) {
       cerr << "which snap command do you want?" << std::endl;
-      usage_exit();
+      usage();
+      return EXIT_FAILURE;
     }
     opt_cmd = get_cmd(*i, true);
   }
@@ -1018,7 +1011,8 @@ int main(int argc, const char **argv)
   }
   if (opt_cmd == OPT_NO_CMD) {
     cerr << "error parsing command '" << *i << "'" << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
 
   for (i = args.erase(i); i != args.end(); ++i) {
@@ -1054,8 +1048,8 @@ int main(int argc, const char **argv)
 	set_conf_param(v, &imgname, &destname);
 	break;
       case OPT_SHOWMAPPED:
-	usage_exit();
-	break;
+	usage();
+	return EXIT_FAILURE;
       default:
 	assert(0);
 	break;
@@ -1066,12 +1060,14 @@ int main(int argc, const char **argv)
 
   if (opt_cmd == OPT_EXPORT && !imgname) {
     cerr << "error: image name was not specified" << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
 
   if (opt_cmd == OPT_IMPORT && !path) {
     cerr << "error: path was not specified" << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
 
   if (opt_cmd == OPT_IMPORT && !destname) {
@@ -1083,7 +1079,8 @@ int main(int argc, const char **argv)
   if (opt_cmd != OPT_LIST && opt_cmd != OPT_IMPORT && opt_cmd != OPT_UNMAP && opt_cmd != OPT_SHOWMAPPED &&
       !imgname) {
     cerr << "error: image name was not specified" << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
 
   // do this unconditionally so we can parse pool/image@snapshot into
@@ -1095,12 +1092,14 @@ int main(int argc, const char **argv)
       opt_cmd != OPT_EXPORT && opt_cmd != OPT_COPY &&
       opt_cmd != OPT_MAP) {
     cerr << "error: snapname specified for a command that doesn't use it" << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
   if ((opt_cmd == OPT_SNAP_CREATE || opt_cmd == OPT_SNAP_ROLLBACK ||
        opt_cmd == OPT_SNAP_REMOVE) && !snapname) {
     cerr << "error: snap name was not specified" << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
 
   set_pool_image_name(dest_poolname, destname, (char **)&dest_poolname, (char **)&destname, NULL);
@@ -1115,14 +1114,15 @@ int main(int argc, const char **argv)
 
   if (opt_cmd == OPT_COPY && !destname ) {
     cerr << "error: destination image name was not specified" << std::endl;
-    usage_exit();
+    usage();
+    return EXIT_FAILURE;
   }
 
   if ((opt_cmd == OPT_RENAME) && (strcmp(poolname, dest_poolname) != 0)) {
     cerr << "error: mv/rename across pools not supported" << std::endl;
     cerr << "source pool: " << poolname << " dest pool: " << dest_poolname
       << std::endl;
-    exit(EXIT_FAILURE);
+    return EXIT_FAILURE;
   }
 
   bool talk_to_cluster = (opt_cmd != OPT_MAP &&
@@ -1130,12 +1130,12 @@ int main(int argc, const char **argv)
 			  opt_cmd != OPT_SHOWMAPPED);
   if (talk_to_cluster && rados.init_with_context(g_ceph_context) < 0) {
     cerr << "error: couldn't initialize rados!" << std::endl;
-    exit(1);
+    return EXIT_FAILURE;
   }
 
   if (talk_to_cluster && rados.connect() < 0) {
     cerr << "error: couldn't connect to the cluster!" << std::endl;
-    exit(1);
+    return EXIT_FAILURE;
   }
 
   int r;
@@ -1143,7 +1143,7 @@ int main(int argc, const char **argv)
     r = rados.ioctx_create(poolname, io_ctx);
     if (r < 0) {
       cerr << "error opening pool " << poolname << ": " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
   }
 
@@ -1155,7 +1155,7 @@ int main(int argc, const char **argv)
     r = rbd.open(io_ctx, image, imgname);
     if (r < 0) {
       cerr << "error opening image " << imgname << ": " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
   }
 
@@ -1164,7 +1164,7 @@ int main(int argc, const char **argv)
     r = image.snap_set(snapname);
     if (r < 0) {
       cerr << "error setting snapshot context: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
   }
 
@@ -1172,7 +1172,7 @@ int main(int argc, const char **argv)
     r = rados.ioctx_create(dest_poolname, dest_io_ctx);
     if (r < 0) {
       cerr << "error opening pool " << dest_poolname << ": " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
   }
 
@@ -1187,7 +1187,7 @@ int main(int argc, const char **argv)
       default:
         cerr << "error: " << cpp_strerror(-r) << std::endl;
       }
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1195,17 +1195,17 @@ int main(int argc, const char **argv)
     if (!size) {
       cerr << "must specify size in MB to create an rbd image" << std::endl;
       usage();
-      exit(1);
+      return EXIT_FAILURE;
     }
     if (order && (order < 12 || order > 25)) {
       cerr << "order must be between 12 (4 KB) and 25 (32 MB)" << std::endl;
       usage();
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_create(rbd, io_ctx, imgname, size, &order, old_format, 0);
     if (r < 0) {
       cerr << "create error: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1213,7 +1213,7 @@ int main(int argc, const char **argv)
     r = do_rename(rbd, io_ctx, imgname, destname);
     if (r < 0) {
       cerr << "rename error: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1221,7 +1221,7 @@ int main(int argc, const char **argv)
     r = do_show_info(imgname, image);
     if (r < 0) {
       cerr << "error: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1242,7 +1242,7 @@ int main(int argc, const char **argv)
       } else {
 	cerr << "delete error: " << cpp_strerror(-r) << std::endl;
       }
-      exit(-r);
+      return -r ;
     }
     break;
 
@@ -1250,92 +1250,92 @@ int main(int argc, const char **argv)
     r = do_resize(image, size);
     if (r < 0) {
       cerr << "resize error: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
   case OPT_SNAP_LIST:
     if (!imgname) {
       usage();
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_list_snaps(image);
     if (r < 0) {
       cerr << "failed to list snapshots: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
   case OPT_SNAP_CREATE:
     if (!imgname || !snapname) {
       usage();
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_add_snap(image, snapname);
     if (r < 0) {
       cerr << "failed to create snapshot: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
   case OPT_SNAP_ROLLBACK:
     if (!imgname) {
       usage();
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_rollback_snap(image, snapname);
     if (r < 0) {
       cerr << "rollback failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
   case OPT_SNAP_REMOVE:
     if (!imgname) {
       usage();
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_remove_snap(image, snapname);
     if (r < 0) {
-      cerr << "rollback failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      cerr << "failed to remove snapshot: " << cpp_strerror(-r) << std::endl;
+      return EXIT_FAILURE;
     }
     break;
 
   case OPT_SNAP_PURGE:
     if (!imgname) {
       usage();
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_purge_snaps(image);
     if (r < 0) {
       cerr << "removing snaps failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
   case OPT_EXPORT:
     if (!path) {
       cerr << "pathname should be specified" << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_export(image, path);
     if (r < 0) {
       cerr << "export error: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
   case OPT_IMPORT:
     if (!path) {
       cerr << "pathname should be specified" << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     r = do_import(rbd, dest_io_ctx, destname, &order, path,
 		  old_format, 0, size);
     if (r < 0) {
       cerr << "import failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1343,7 +1343,7 @@ int main(int argc, const char **argv)
     r = do_copy(image, dest_io_ctx, destname);
     if (r < 0) {
       cerr << "copy failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1351,7 +1351,7 @@ int main(int argc, const char **argv)
     r = do_watch(io_ctx, imgname);
     if (r < 0) {
       cerr << "watch failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1359,7 +1359,7 @@ int main(int argc, const char **argv)
     r = do_kernel_add(poolname, imgname, snapname, secretfile, user);
     if (r < 0) {
       cerr << "add failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1367,7 +1367,7 @@ int main(int argc, const char **argv)
     r = do_kernel_rm(devpath);
     if (r < 0) {
       cerr << "remove failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
 
@@ -1375,7 +1375,7 @@ int main(int argc, const char **argv)
     r = do_kernel_showmapped();
     if (r < 0) {
       cerr << "showmapped failed: " << cpp_strerror(-r) << std::endl;
-      exit(1);
+      return EXIT_FAILURE;
     }
     break;
   }