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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using namespace persistent_data;
using namespace std;
using namespace thin_provisioning;
struct flags {
bool find_metadata_snap;
bool repair;
};
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namespace {
int dump(string const &path, ostream *out, string const &format, struct flags &flags,
block_address metadata_snap = 0) {
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try {
metadata::ptr md(new metadata(path, metadata_snap));
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emitter::ptr e;
if (flags.find_metadata_snap) {
uint64_t metadata_snap_root = md->sb_.metadata_snap_; /* FIXME: use thin_pool method? */
if (metadata_snap_root) {
md.reset();
md = metadata::ptr(new metadata(path, metadata_snap_root));
} else {
cerr << "no metadata snapshot found!" << endl;
exit(1);
}
}
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if (format == "xml")
e = create_xml_emitter(*out);
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else if (format == "human_readable")
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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}
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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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}
}
int main(int argc, char **argv)
{
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;
flags.find_metadata_snap = flags.repair = false;
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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':
if (optarg) {
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;
}
} else
flags.find_metadata_snap = true;
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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 ? new ofstream(output) : &cout, format, flags, metadata_snap);
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}