thin-provisioning-tools/era/era_restore.cc

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#include "version.h"
#include "base/file_utils.h"
#include "base/output_file_requirements.h"
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#include "era/commands.h"
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#include "era/metadata.h"
#include "era/restore_emitter.h"
#include "era/xml_format.h"
#include "persistent-data/file_utils.h"
#include <boost/lexical_cast.hpp>
#include <fstream>
#include <getopt.h>
#include <iostream>
#include <libgen.h>
#include <string>
using namespace boost;
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using namespace era;
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using namespace persistent_data;
using namespace std;
//----------------------------------------------------------------
namespace {
struct flags {
flags()
: quiet(false) {
}
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optional<string> input;
optional<string> output;
bool quiet;
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};
int restore(flags const &fs, bool quiet) {
bool metadata_touched = false;
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try {
block_manager<>::ptr bm = open_bm(*fs.output, block_manager<>::READ_WRITE);
file_utils::check_file_exists(*fs.output);
metadata_touched = true;
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metadata::ptr md(new metadata(bm, metadata::CREATE));
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emitter::ptr restorer = create_restore_emitter(*md);
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parse_xml(*fs.input, restorer, fs.quiet);
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} catch (std::exception &e) {
if (metadata_touched)
file_utils::zero_superblock(*fs.output);
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cerr << e.what() << endl;
return 1;
}
return 0;
}
}
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//----------------------------------------------------------------
era_restore_cmd::era_restore_cmd()
: command("era_restore")
{
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}
void
era_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
<< " {-q|--quiet}" << endl
<< " {-V|--version}" << endl;
}
int
era_restore_cmd::run(int argc, char **argv)
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{
int c;
flags fs;
char const *short_opts = "hi:o:qV";
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option const long_opts[] = {
{ "help", no_argument, NULL, 'h'},
{ "input", required_argument, NULL, 'i' },
{ "output", required_argument, NULL, 'o'},
{ "quiet", no_argument, NULL, 'q'},
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{ "version", no_argument, NULL, 'V'},
{ NULL, no_argument, NULL, 0 }
};
while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
switch(c) {
case 'h':
usage(cout);
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return 0;
case 'i':
fs.input = optional<string>(string(optarg));
break;
case 'o':
fs.output = optional<string>(string(optarg));
break;
case 'q':
fs.quiet = true;
break;
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case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
return 0;
default:
usage(cerr);
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return 1;
}
}
if (argc != optind) {
usage(cerr);
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return 1;
}
if (!fs.input) {
cerr << "No input file provided." << endl << endl;
usage(cerr);
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return 1;
}
if (fs.output)
check_output_file_requirements(*fs.output);
else {
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cerr << "No output file provided." << endl << endl;
usage(cerr);
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return 1;
}
return restore(fs, fs.quiet);
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}
//----------------------------------------------------------------