1 files changed, 107 insertions, 0 deletions
diff --git a/src/VBox/Main/src-helper-apps/VBoxVolInfo.cpp b/src/VBox/Main/src-helper-apps/VBoxVolInfo.cpp
new file mode 100644
index 00000000..489ae72e
--- /dev/null
+++ b/src/VBox/Main/src-helper-apps/VBoxVolInfo.cpp
@@ -0,0 +1,107 @@
+/* $Id: VBoxVolInfo.cpp $ */
+/** @file
+ * Apps - VBoxVolInfo, Volume information tool.
+ */
+
+/*
+ * Copyright (C) 2012-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <dirent.h>
+extern "C"
+{
+#define private privatekw
+#include <libdevmapper.h>
+}
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+
+/*********************************************************************************************************************************
+*   Function Prototypes                                                                                                          *
+*********************************************************************************************************************************/
+void print_dev_name(dev_t devid);
+
+/*
+ * Extracts logical volume dependencies via devmapper API and print them out.
+ */
+int main(int argc, char **argv)
+{
+    struct dm_task *dmtask;
+    struct dm_info  dminfo;
+
+    if (argc != 2)
+    {
+        fprintf(stderr, "USAGE: %s <volume_name>\n", argv[0]);
+        return 1;
+    }
+
+    dmtask = dm_task_create(DM_DEVICE_DEPS);
+    if (!dmtask)
+        return 2;
+
+    if (dm_task_set_name(dmtask, argv[1]))
+        if (dm_task_run(dmtask))
+            if (dm_task_get_info(dmtask, &dminfo))
+            {
+                struct dm_deps *dmdeps = dm_task_get_deps(dmtask);
+                if (dmdeps)
+                {
+                    unsigned i;
+                    for (i = 0; i < dmdeps->count; ++i)
+                        print_dev_name(dmdeps->device[i]);
+                }
+            }
+
+    dm_task_destroy(dmtask);
+    return 0;
+}
+
+/*
+ * Looks up device name by id using /dev directory. Prints it to stdout.
+ */
+void print_dev_name(dev_t devid)
+{
+    char path[PATH_MAX];
+    struct dirent *de;
+    DIR *dir = opendir("/dev");
+
+    while ((de = readdir(dir)) != NULL)
+    {
+        struct stat st;
+        snprintf(path, sizeof(path), "/dev/%s", de->d_name);
+        if (!stat(path, &st))
+            if (S_ISBLK(st.st_mode))
+                if (devid == st.st_rdev)
+                {
+                    puts(de->d_name);
+                    break;
+                }
+    }
+    closedir(dir);
+}