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[cache_restore] --debug-override-metadata-version

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A flag that deliberately causes the wrong metadata version to be
written.  Useful for testing the kernel module.
This commit is contained in:
Joe Thornber
2013-10-15 10:24:12 +01:00
parent c92aff63e2
commit f8633da296
4 changed files with 62 additions and 16 deletions
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51
caching/cache_restore.cc
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@@ -5,12 +5,14 @@
#include "caching/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;
@@ -18,14 +20,31 @@ using namespace std;
//----------------------------------------------------------------
namespace {
int restore(string const &xml_file, string const &dev) {
struct flags {
flags()
: metadata_version(1),
override_metadata_version(false) {
}
optional<string> input;
optional<string> output;
uint32_t metadata_version;
bool override_metadata_version;
};
int restore(flags const &fs) {
try {
block_manager<>::ptr bm = open_bm(dev, block_io<>::READ_WRITE);
block_manager<>::ptr bm = open_bm(*fs.output, block_io<>::READ_WRITE);
metadata::ptr md(new metadata(bm, metadata::CREATE));
emitter::ptr restorer = create_restore_emitter(md);
check_file_exists(xml_file);
ifstream in(xml_file.c_str(), ifstream::in);
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);
parse_xml(in, restorer);
} catch (std::exception &e) {
@@ -42,17 +61,21 @@ namespace {
<< " {-h|--help}" << endl
<< " {-i|--input} <input xml file>" << endl
<< " {-o|--output} <output device or file>" << endl
<< " {-V|--version}" << endl;
<< " {-V|--version}" << endl
<< endl
<< " {--debug-override-metadata-version} <integer>" << endl;
}
}
int main(int argc, char **argv)
{
int c;
string input, output;
flags fs;
char const *prog_name = basename(argv[0]);
char const *short_opts = "hi:o:V";
option const long_opts[] = {
{ "debug-override-metadata-version", required_argument, NULL, 0 },
{ "help", no_argument, NULL, 'h'},
{ "input", required_argument, NULL, 'i' },
{ "output", required_argument, NULL, 'o'},
@@ -62,16 +85,21 @@ int main(int argc, char **argv)
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;
case 'h':
usage(cout, prog_name);
return 0;
case 'i':
input = optarg;
fs.input = optional<string>(string(optarg));
break;
case 'o':
output = optarg;
fs.output = optional<string>(string(optarg));
break;
case 'V':
@@ -89,20 +117,19 @@ int main(int argc, char **argv)
return 1;
}
if (input.empty()) {
if (!fs.input) {
cerr << "No input file provided." << endl << endl;
usage(cerr, prog_name);
return 1;
}
if (output.empty()) {
if (!fs.output) {
cerr << "No output file provided." << endl << endl;
usage(cerr, prog_name);
return 1;
}
return restore(input, output);
return restore(fs);
}
//----------------------------------------------------------------