cache_check work

cache/check.cc

@@ -17,21 +17,71 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <iostream>
+#include <sstream>
+#include <string>
+#include <stdexcept>
+
+#include <errno.h>
+#include <fcntl.h>
 #include <getopt.h>
 #include <libgen.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
 
-#if 0
-#include "array.h"
-#include "metadata.h"
-#include "metadata_checker.h"
-#include "version.h"
-
-using namespace persistent_data;
 using namespace std;
-using namespace thin_provisioning;
+
+//----------------------------------------------------------------
 
 namespace {
+	struct stat guarded_stat(string const &path) {
+		struct stat info;
+
+		int r = ::stat(path.c_str(), &info);
+		if (r) {
+			ostringstream msg;
+			char buffer[128], *ptr;
+
+			ptr = ::strerror_r(errno, buffer, sizeof(buffer));
+			msg << path << ": " << ptr;
+			throw runtime_error(msg.str());
+		}
+
+		return info;
+	}
+
+	int open_file(string const &path, int mode) {
+		int fd = open(path.c_str(), mode);
+		if (fd < 0) {
+			ostringstream msg;
+			char buffer[128], *ptr;
+
+			ptr = strerror_r(errno, buffer, sizeof(buffer));
+			msg << path << ": " << ptr;
+			throw runtime_error(msg.str());
+		}
+
+		return fd;
+	}
+
 	int check(string const &path, bool quiet) {
+		struct stat info = guarded_stat(path);
+
+		if (!S_ISREG(info.st_mode) && !S_ISBLK(info.st_mode)) {
+			ostringstream msg;
+			msg << path << ": " << "Not a block device or regular file";
+			throw runtime_error(msg.str());
+		}
+
+		int fd = open_file(path, O_RDONLY);
+
+		ostringstream msg;
+		msg << path << ": " << "No superblock found";
+		throw runtime_error(msg.str());
+		return 0;
+
+#if 0
 		try {
 			metadata::ptr md(new metadata(path, metadata::OPEN));
 
@@ -48,6 +98,7 @@ namespace {
 		}
 
 		return 0;
+#endif
 	}
 
 	void usage(ostream &out, string const &cmd) {
@@ -57,8 +108,12 @@ namespace {
 		    << "  {-h|--help}" << endl
 		    << "  {-V|--version}" << endl;
 	}
+
+	char const *TOOLS_VERSION = "0.1.6";
 }
 
+//----------------------------------------------------------------
+
 int main(int argc, char **argv)
 {
 	int c;
@@ -82,7 +137,7 @@ int main(int argc, char **argv)
 			break;
 
 		case 'V':
-			cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
+			cout << TOOLS_VERSION << endl;
 			return 0;
 
 		default:
@@ -94,15 +149,18 @@ int main(int argc, char **argv)
 	if (argc == optind) {
 		cerr << "No input file provided." << endl;
 		usage(cerr, basename(argv[0]));
-		exit(1);
+		return 1;
 	}
 
-	return check(argv[optind], quiet);
+	try {
+		check(argv[optind], quiet);
+
+	} catch (exception const &e) {
+		cerr << e.what() << endl;
+		return 1;
+	}
+
+	return 0;
 }
-#else
-int main(int argc, char **argv)
-{
-	cerr << "not implemented" << endl;
-	return 1;
-}
-#endif
+
+//----------------------------------------------------------------