thin-provisioning-tools/caching/cache_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 "caching/commands.h"
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#include "caching/metadata.h"
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#include "caching/restore_emitter.h"
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#include "caching/xml_format.h"
#include "persistent-data/file_utils.h"
#include <boost/lexical_cast.hpp>
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#include <fstream>
#include <getopt.h>
#include <iostream>
#include <libgen.h>
#include <string>
using namespace boost;
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using namespace caching;
using namespace persistent_data;
using namespace file_utils;
using namespace std;
//----------------------------------------------------------------
namespace {
unique_ptr<progress_monitor> create_monitor(bool quiet) {
if (!quiet && isatty(fileno(stdout)))
return create_progress_bar("Restoring");
else
return create_quiet_progress_monitor();
}
struct flags {
flags()
: metadata_version(1),
clean_shutdown(true),
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quiet(false),
override_metadata_version(false),
override_version(1) {
}
optional<string> input;
optional<string> output;
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uint32_t metadata_version;
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bool clean_shutdown;
bool quiet;
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bool override_metadata_version;
unsigned override_version;
};
void override_version(metadata::ptr md, flags const &fs) {
md->sb_.version = fs.override_version;
md->commit(fs.clean_shutdown);
}
int restore(flags const &fs) {
bool metadata_touched = false;
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try {
block_manager<>::ptr bm = open_bm(*fs.output, block_manager<>::READ_WRITE);
check_file_exists(*fs.input);
ifstream in(fs.input->c_str(), ifstream::in);
metadata_touched = true;
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metadata::ptr md(new metadata(bm, metadata::CREATE));
emitter::ptr restorer = create_restore_emitter(md,
fs.metadata_version,
fs.clean_shutdown ? CLEAN_SHUTDOWN : NO_CLEAN_SHUTDOWN);
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unique_ptr<progress_monitor> monitor = create_monitor(fs.quiet);
parse_xml(in, restorer, get_file_length(*fs.input), *monitor);
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if (fs.override_metadata_version)
override_version(md, fs);
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} catch (std::exception &e) {
if (metadata_touched)
zero_superblock(*fs.output);
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cerr << e.what() << endl;
return 1;
}
return 0;
}
}
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//----------------------------------------------------------------
cache_restore_cmd::cache_restore_cmd()
: command("cache_restore")
{
}
void
cache_restore_cmd::usage(std::ostream &out) const
{
out << "Usage: " << get_name() << " [options]" << endl
<< "Options:" << endl
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<< " {-h|--help}\n"
<< " {-i|--input} <input xml file>\n"
<< " {-o|--output} <output device or file>\n"
<< " {-q|--quiet}\n"
<< " {--metadata-version} <1 or 2>\n"
<< " {-V|--version}\n"
<< "\n"
<< " {--debug-override-metadata-version} <integer>" << endl
<< " {--omit-clean-shutdown}" << endl;
}
int
cache_restore_cmd::run(int argc, char **argv)
{
int c;
flags fs;
char const *short_opts = "hi:o:qV";
option const long_opts[] = {
{ "debug-override-metadata-version", required_argument, NULL, 0 },
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{ "omit-clean-shutdown", no_argument, NULL, 1 },
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{ "metadata-version", required_argument, NULL, 2 },
{ "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 0:
fs.override_metadata_version = true;
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fs.override_version = lexical_cast<uint32_t>(optarg);
break;
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case 1:
fs.clean_shutdown = false;
break;
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case 2:
fs.metadata_version = lexical_cast<uint32_t>(optarg);
if ((fs.metadata_version < MIN_METADATA_VERSION) ||
(fs.metadata_version > MAX_METADATA_VERSION)) {
cerr << "Bad metadata version\n\n";
return 1;
}
break;
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);
}
//----------------------------------------------------------------