thin-provisioning-tools/thin-provisioning/thin_restore.cc
2019-10-25 15:02:56 +05:30

178 lines
5.8 KiB
C++

// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
//
// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools 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, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools 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 thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
#include "base/file_utils.h"
#include "base/output_file_requirements.h"
#include "persistent-data/file_utils.h"
#include "thin-provisioning/commands.h"
#include "thin-provisioning/emitter.h"
#include "thin-provisioning/human_readable_format.h"
#include "thin-provisioning/metadata.h"
#include "thin-provisioning/override_emitter.h"
#include "thin-provisioning/restore_emitter.h"
#include "thin-provisioning/xml_format.h"
#include "version.h"
#include <fstream>
#include <getopt.h>
#include <iostream>
#include <libgen.h>
#include <linux/fs.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
using namespace persistent_data;
using namespace std;
using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
int restore(string const &backup_file, string const &dev, bool quiet, override_options const &opts) {
bool metadata_touched = false;
try {
// The block size gets updated by the restorer.
block_manager<>::ptr bm(open_bm(dev, block_manager<>::READ_WRITE));
file_utils::check_file_exists(backup_file);
metadata_touched = true;
metadata::ptr md(new metadata(bm, metadata::CREATE, 128, 0));
emitter::ptr inner = create_restore_emitter(md);
emitter::ptr restorer = create_override_emitter(inner, opts);
parse_xml(backup_file, restorer, quiet);
} catch (std::exception &e) {
if (metadata_touched)
file_utils::zero_superblock(dev);
cerr << e.what() << endl;
return 1;
}
return 0;
}
}
//----------------------------------------------------------------
thin_restore_cmd::thin_restore_cmd()
: command("thin_restore")
{
}
void
thin_restore_cmd::usage(std::ostream &out) const
{
out << "Usage: " << get_name() << " [options]" << endl
<< "Options:" << endl
<< " {-h|--help}" << endl
<< " {-i|--input} <input xml file>" << endl
<< " {-o|--output} <output device or file>" << endl
<< " {--transaction-id} <natural>" << endl
<< " {--data-block-size} <natural>" << endl
<< " {--nr-data-blocks} <natural>" << endl
<< " {-q|--quiet}" << endl
<< " {-V|--version}" << endl;
}
int
thin_restore_cmd::run(int argc, char **argv)
{
int c;
const char *shortopts = "hi:o:qV";
string input, output;
bool quiet = false;
override_options opts;
const struct option longopts[] = {
{ "help", no_argument, NULL, 'h'},
{ "input", required_argument, NULL, 'i' },
{ "output", required_argument, NULL, 'o'},
{ "transaction-id", required_argument, NULL, 1},
{ "data-block-size", required_argument, NULL, 2},
{ "nr-data-blocks", required_argument, NULL, 3},
{ "quiet", no_argument, NULL, 'q'},
{ "version", no_argument, NULL, 'V'},
{ NULL, no_argument, NULL, 0 }
};
while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
switch(c) {
case 'h':
usage(cout);
return 0;
case 'i':
input = optarg;
break;
case 'o':
output = optarg;
break;
case 1:
opts.transaction_id_ = parse_uint64(optarg, "transaction id");
break;
case 2:
opts.data_block_size_ = static_cast<uint32_t>(parse_uint64(optarg, "data block size"));
break;
case 3:
opts.nr_data_blocks_ = parse_uint64(optarg, "nr data blocks");
break;
case 'q':
quiet = true;
break;
case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
return 0;
default:
usage(cerr);
return 1;
}
}
if (argc != optind) {
usage(cerr);
return 1;
}
if (input.empty()) {
cerr << "No input file provided." << endl << endl;
usage(cerr);
return 1;
}
if (output.empty()) {
cerr << "No output file provided." << endl << endl;
usage(cerr);
return 1;
} else
check_output_file_requirements(output);
return restore(input, output, quiet, opts);
}
//----------------------------------------------------------------