thin-provisioning-tools/caching/cache_repair.cc

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#include <iostream>
#include <getopt.h>
#include <libgen.h>
#include "base/file_utils.h"
#include "base/output_file_requirements.h"
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#include "caching/commands.h"
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#include "caching/metadata.h"
#include "caching/metadata_dump.h"
#include "caching/restore_emitter.h"
#include "persistent-data/file_utils.h"
#include "version.h"
using namespace persistent_data;
using namespace std;
using namespace caching;
//----------------------------------------------------------------
namespace {
metadata::ptr open_metadata_for_read(string const &path) {
block_manager<>::ptr bm = open_bm(path, block_manager<>::READ_ONLY);
return metadata::ptr(new metadata(bm));
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}
emitter::ptr output_emitter(string const &path) {
block_manager<>::ptr bm = open_bm(path, block_manager<>::READ_WRITE);
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metadata::ptr md(new metadata(bm, metadata::CREATE));
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return create_restore_emitter(md, true);
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}
int repair(string const &old_path, string const &new_path) {
bool metadata_touched = false;
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try {
file_utils::check_file_exists(new_path, false);
metadata_touched = true;
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metadata_dump(open_metadata_for_read(old_path),
output_emitter(new_path),
true);
} catch (std::exception &e) {
if (metadata_touched)
file_utils::zero_superblock(new_path);
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cerr << e.what() << endl;
return 1;
}
return 0;
}
}
//----------------------------------------------------------------
cache_repair_cmd::cache_repair_cmd()
: command("cache_repair")
{
}
void
cache_repair_cmd::usage(std::ostream &out) const
{
out << "Usage: " << get_name() << " [options] {device|file}" << endl
<< "Options:" << endl
<< " {-h|--help}" << endl
<< " {-i|--input} <input metadata (binary format)>" << endl
<< " {-o|--output} <output metadata (binary format)>" << endl
<< " {-V|--version}" << endl;
}
int
cache_repair_cmd::run(int argc, char **argv)
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{
int c;
boost::optional<string> input_path, output_path;
const char shortopts[] = "hi:o:V";
const struct option longopts[] = {
{ "help", no_argument, NULL, 'h'},
{ "input", required_argument, NULL, 'i'},
{ "output", required_argument, NULL, 'o'},
{ "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);
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return 0;
case 'i':
input_path = optarg;
break;
case 'o':
output_path = optarg;
break;
case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
return 0;
default:
usage(cerr);
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return 1;
}
}
if (!input_path) {
cerr << "no input file provided" << endl;
usage(cerr);
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return 1;
}
if (output_path)
check_output_file_requirements(*output_path);
else {
cerr << "No output file provided." << endl;
usage(cerr);
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return 1;
}
return repair(*input_path, *output_path);
}
//----------------------------------------------------------------