thin-provisioning-tools/thin-provisioning/thin_dump.cc
2017-09-18 16:10:56 +01:00

220 lines
5.2 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 <fstream>
#include <iostream>
#include <getopt.h>
#include <libgen.h>
#include "persistent-data/file_utils.h"
#include "thin-provisioning/commands.h"
#include "thin-provisioning/human_readable_format.h"
#include "thin-provisioning/metadata.h"
#include "thin-provisioning/metadata_dumper.h"
#include "thin-provisioning/shared_library_emitter.h"
#include "thin-provisioning/xml_format.h"
#include "version.h"
using namespace boost;
using namespace persistent_data;
using namespace std;
using namespace thin_provisioning;
namespace {
// FIXME: put the path into the flags
struct flags {
flags()
: format("xml"),
use_metadata_snap(false) {
}
dump_options opts;
string format;
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;
}
bool begins_with(string const &str, string const &prefix) {
return str.substr(0, prefix.length()) == prefix;
}
emitter::ptr create_emitter(string const &format, ostream &out) {
emitter::ptr e;
if (format == "xml")
e = create_xml_emitter(out);
else if (format == "human_readable")
e = create_human_readable_emitter(out);
else if (begins_with(format, "custom="))
e = create_custom_emitter(format.substr(7), out);
else {
ostringstream msg;
msg << "unknown format '" << format << "'";
throw runtime_error(msg.str());
}
return e;
}
int dump_(string const &path, ostream &out, struct flags &flags) {
try {
metadata::ptr md = open_metadata(path, flags);
emitter::ptr e = create_emitter(flags.format, out);
metadata_dump(md, e, flags.opts);
} catch (std::exception &e) {
cerr << e.what() << endl;
return 1;
}
return 0;
}
int dump(string const &path, char const *output, struct flags &flags) {
if (output) {
ofstream out(output);
return dump_(path, out, flags);
} else
return dump_(path, cout, flags);
}
}
//----------------------------------------------------------------
thin_dump_cmd::thin_dump_cmd()
: command("thin_dump")
{
}
void
thin_dump_cmd::usage(std::ostream &out) const
{
out << "Usage: " << get_name() << " [options] {device|file}\n"
<< "Options:\n"
<< " {-h|--help}\n"
<< " {-f|--format} {xml|human_readable|custom}\n"
<< " {-r|--repair}\n"
<< " {-m|--metadata-snap} [block#]\n"
<< " {-o <xml file>}\n"
<< " {--dev-id} <dev-id>\n"
<< " {--skip-mappings}\n"
<< " {-V|--version}" << endl;
}
int
thin_dump_cmd::run(int argc, char **argv)
{
int c;
char const *output = NULL;
const char shortopts[] = "hm::o:f:rV";
char *end_ptr;
block_address metadata_snap = 0;
uint64_t dev_id;
struct flags flags;
const struct option longopts[] = {
{ "help", no_argument, NULL, 'h'},
{ "metadata-snap", optional_argument, NULL, 'm' },
{ "output", required_argument, NULL, 'o'},
{ "format", required_argument, NULL, 'f' },
{ "repair", no_argument, NULL, 'r'},
{ "dev-id", required_argument, NULL, 1 },
{ "skip-mappings", no_argument, NULL, 2 },
{ "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 'f':
flags.format = optarg;
break;
case 'r':
flags.opts.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);
return 1;
}
flags.snap_location = metadata_snap;
}
break;
case 'o':
output = optarg;
break;
case 1:
dev_id = strtoull(optarg, &end_ptr, 10);
if (end_ptr == optarg) {
cerr << "couldn't parse <dev-id>\n";
usage(cerr);
return 1;
}
flags.opts.select_dev(dev_id);
break;
case 2:
flags.opts.skip_mappings_ = true;
break;
case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
return 0;
default:
usage(cerr);
return 1;
}
}
if (argc == optind) {
cerr << "No input file provided." << endl;
usage(cerr);
return 1;
}
return dump(argv[optind], output, flags);
}
//----------------------------------------------------------------