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/* $Id: VBoxVolInfo.cpp $ */
/** @file
* Apps - VBoxVolInfo, Volume information tool.
*/
/*
* Copyright (C) 2012-2023 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);
}
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