thin-provisioning-tools/thin-provisioning/thin_dump.cc

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// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// 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/>.
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#include <fstream>
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#include <iostream>
#include <getopt.h>
#include <libgen.h>
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#include "human_readable_format.h"
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#include "metadata_dumper.h"
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#include "metadata.h"
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#include "xml_format.h"
#include "version.h"
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#include "thin-provisioning/commands.h"
#include "persistent-data/file_utils.h"
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using namespace boost;
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using namespace persistent_data;
using namespace std;
using namespace thin_provisioning;
namespace {
// FIXME: put the path into the flags
struct flags {
flags()
: repair(false),
use_metadata_snap(false) {
}
bool repair;
bool use_metadata_snap;
optional<block_address> snap_location;
};
metadata::ptr open_metadata(string const &path, struct flags &flags) {
block_manager<>::ptr bm = open_bm(path, block_manager<>::READ_ONLY, !flags.use_metadata_snap);
metadata::ptr md(flags.use_metadata_snap ? new metadata(bm, flags.snap_location) : new metadata(bm));
return md;
}
int dump_(string const &path, ostream &out, string const &format, struct flags &flags) {
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try {
metadata::ptr md = open_metadata(path, flags);
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emitter::ptr e;
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if (format == "xml")
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e = create_xml_emitter(out);
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else if (format == "human_readable")
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e = create_human_readable_emitter(out);
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else {
cerr << "unknown format '" << format << "'" << endl;
exit(1);
}
metadata_dump(md, e, flags.repair);
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} catch (std::exception &e) {
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cerr << e.what() << endl;
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return 1;
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}
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return 0;
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}
int dump(string const &path, char const *output, string const &format, struct flags &flags) {
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if (output) {
ofstream out(output);
return dump_(path, out, format, flags);
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} else
return dump_(path, cout, format, flags);
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}
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void usage(ostream &out, string const &cmd) {
out << "Usage: " << cmd << " [options] {device|file}" << endl
<< "Options:" << endl
<< " {-h|--help}" << endl
<< " {-f|--format} {xml|human_readable}" << endl
<< " {-r|--repair}" << endl
<< " {-m|--metadata-snap} [block#]" << endl
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<< " {-o <xml file>}" << endl
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<< " {-V|--version}" << endl;
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}
}
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int thin_dump_main(int argc, char **argv)
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{
int c;
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char const *output = NULL;
const char shortopts[] = "hm::o:f:rV";
char *end_ptr;
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string format = "xml";
block_address metadata_snap = 0;
struct flags flags;
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const struct option longopts[] = {
{ "help", no_argument, NULL, 'h'},
{ "metadata-snap", optional_argument, NULL, 'm' },
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{ "output", required_argument, NULL, 'o'},
{ "format", required_argument, NULL, 'f' },
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{ "repair", no_argument, NULL, 'r'},
{ "version", no_argument, NULL, 'V'},
{ NULL, no_argument, NULL, 0 }
};
while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
switch(c) {
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case 'h':
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usage(cout, basename(argv[0]));
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return 0;
case 'f':
format = optarg;
break;
case 'r':
flags.repair = true;
break;
case 'm':
flags.use_metadata_snap = true;
if (optarg) {
// FIXME: deprecate this option
metadata_snap = strtoull(optarg, &end_ptr, 10);
if (end_ptr == optarg) {
cerr << "couldn't parse <metadata_snap>" << endl;
usage(cerr, basename(argv[0]));
return 1;
}
flags.snap_location = metadata_snap;
}
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break;
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case 'o':
output = optarg;
break;
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case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
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return 0;
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default:
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usage(cerr, basename(argv[0]));
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return 1;
}
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}
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if (argc == optind) {
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cerr << "No input file provided." << endl;
usage(cerr, basename(argv[0]));
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return 1;
}
return dump(argv[optind], output, format, flags);
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}
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base::command thin_provisioning::thin_dump_cmd("thin_dump", thin_dump_main);
//----------------------------------------------------------------