thin-provisioning-tools/era/era_restore.cc
Ming-Hung Tsai f6eb5173c9 [era_restore] Avoid touching the output file by checking input file earlier
The output file has been checked by the caller, so there's no need
to check the output file again.
2021-10-21 17:51:28 +08:00

147 lines
2.9 KiB
C++

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