Merge branch 'jk/report-fail-to-read-objects-better' into maint

Reworded the error message given upon a failure to open an existing
loose object file due to e.g. permission issues; it was reported as
the object being corrupt, but that is not quite true.

* jk/report-fail-to-read-objects-better:
  open_sha1_file: report "most interesting" errno

Author: gitster

sha1_file.c

@@ -1437,19 +1437,23 @@ static int open_sha1_file(const unsigned char *sha1)
 {
 	int fd;
 	struct alternate_object_database *alt;
+	int most_interesting_errno;
 
 	fd = git_open_noatime(sha1_file_name(sha1));
 	if (fd >= 0)
 		return fd;
+	most_interesting_errno = errno;
 
 	prepare_alt_odb();
-	errno = ENOENT;
 	for (alt = alt_odb_list; alt; alt = alt->next) {
 		fill_sha1_path(alt->name, sha1);
 		fd = git_open_noatime(alt->base);
 		if (fd >= 0)
 			return fd;
+		if (most_interesting_errno == ENOENT)
+			most_interesting_errno = errno;
 	}
+	errno = most_interesting_errno;
 	return -1;
 }