thin-provisioning-tools/caching/cache_restore.cc

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#include "version.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 std;
//----------------------------------------------------------------
namespace {
size_t get_file_length(string const &file) {
struct stat info;
int r;
r = ::stat(file.c_str(), &info);
if (r)
throw runtime_error("Couldn't stat backup path");
return info.st_size;
}
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),
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override_metadata_version(false),
clean_shutdown(true),
quiet(false) {
}
optional<string> input;
optional<string> output;
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uint32_t metadata_version;
bool override_metadata_version;
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bool clean_shutdown;
bool quiet;
};
int restore(flags const &fs) {
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try {
block_manager<>::ptr bm = open_bm(*fs.output, block_manager<>::READ_WRITE);
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metadata::ptr md(new metadata(bm, metadata::CREATE));
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emitter::ptr restorer = create_restore_emitter(md, fs.clean_shutdown);
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if (fs.override_metadata_version) {
cerr << "overriding" << endl;
md->sb_.version = fs.metadata_version;
}
check_file_exists(*fs.input);
ifstream in(fs.input->c_str(), ifstream::in);
unique_ptr<progress_monitor> monitor = create_monitor(fs.quiet);
parse_xml(in, restorer, get_file_length(*fs.input), *monitor);
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} catch (std::exception &e) {
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
<< " {-h|--help}" << endl
<< " {-i|--input} <input xml file>" << endl
<< " {-o|--output} <output device or file>" << endl
<< " {-q|--quiet}" << endl
<< " {-V|--version}" << endl
<< endl
<< " {--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 },
{ "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.metadata_version = lexical_cast<uint32_t>(optarg);
fs.override_metadata_version = true;
break;
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case 1:
fs.clean_shutdown = false;
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) {
cerr << "No output file provided." << endl << endl;
usage(cerr);
return 1;
}
return restore(fs);
}
//----------------------------------------------------------------