improve error message when failing to stat block device

2016-03-31 14:20:12 +03:00
parent 022b70f861
commit ab958ee752
1 changed files with 2 additions and 1 deletions
--- a/persistent-data/file_utils.cc
+++ b/persistent-data/file_utils.cc
@@ -21,7 +21,8 @@ persistent_data::get_nr_blocks(string const &path, sector_t block_size)

 	int r = ::stat(path.c_str(), &info);
 	if (r)
-		throw runtime_error("Couldn't stat dev path");
+		throw runtime_error("Couldn't stat dev path " + path + ": " +
+			strerror(errno));

 	if (S_ISREG(info.st_mode) && info.st_size)
 		nr_blocks = div_up<block_address>(info.st_size, block_size);