first drop of era_restore

era/era_restore.cc

@@ -0,0 +1,115 @@
+#include "version.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 caching;
+using namespace persistent_data;
+using namespace std;
+
+//----------------------------------------------------------------
+
+namespace {
+	struct flags {
+		optional<string> input;
+		optional<string> output;
+	};
+
+	int restore(flags const &fs) {
+		try {
+			block_manager<>::ptr bm = open_bm(*fs.output, block_manager<>::READ_WRITE);
+			metadata::ptr md(new metadata(bm, metadata::CREATE));
+			emitter::ptr restorer = create_restore_emitter(md);
+
+			check_file_exists(*fs.input);
+			ifstream in(fs.input->c_str(), ifstream::in);
+			parse_xml(in, restorer);
+
+		} catch (std::exception &e) {
+			cerr << e.what() << endl;
+			return 1;
+		}
+
+		return 0;
+	}
+
+	void usage(ostream &out, string const &cmd) {
+		out << "Usage: " << cmd << " [options]" << endl
+		    << "Options:" << endl
+		    << "  {-h|--help}" << endl
+		    << "  {-i|--input} <input xml file>" << endl
+		    << "  {-o|--output} <output device or file>" << endl
+		    << "  {-V|--version}" << endl
+		    << endl;
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int c;
+	flags fs;
+	char const *prog_name = basename(argv[0]);
+	char const *short_opts = "hi:o:V";
+	option const long_opts[] = {
+		{ "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, short_opts, long_opts, NULL)) != -1) {
+		switch(c) {
+		case 'h':
+			usage(cout, prog_name);
+			return 0;
+
+		case 'i':
+			fs.input = optional<string>(string(optarg));
+			break;
+
+		case 'o':
+			fs.output = optional<string>(string(optarg));
+			break;
+
+		case 'V':
+			cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
+			return 0;
+
+		default:
+			usage(cerr, prog_name);
+			return 1;
+		}
+	}
+
+	if (argc != optind) {
+		usage(cerr, prog_name);
+		return 1;
+	}
+
+        if (!fs.input) {
+		cerr << "No input file provided." << endl << endl;
+		usage(cerr, prog_name);
+		return 1;
+	}
+
+	if (!fs.output) {
+		cerr << "No output file provided." << endl << endl;
+		usage(cerr, prog_name);
+		return 1;
+	}
+
+	return restore(fs);
+}
+
+//----------------------------------------------------------------