[Tarantool-patches] [PATCH] test_run: add path option to grep_log

[Olga Arkhangelskaia <arkholga@tarantool.org>]

While using grep_log it is useful to have a possibility to go through crashed
instance log.
Usage in case of crashed instance:
test_run:grep_log(nil, str-to-find, nil, {path=path_to_log})

Closes #196
---
Issue:https://github.com/tarantool/test-run/issues/196                          
Branch:https://github.com/tarantool/test-run/pull/new/OKriw/gh-196-Extend-grep_log-for-crashed-instances

 test_run.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test_run.lua b/test_run.lua
index 4d8132d..68dba53 100644
--- a/test_run.lua
+++ b/test_run.lua
@@ -326,7 +326,9 @@ end
 local function grep_log(self, node, what, bytes, opts)
     local opts = opts or {}
     local noreset = opts.noreset or false
-    local filename = self:eval(node, "box.cfg.log")[1]
+    -- node is used in case of alive instance, otherwise path to log can be
+    -- used for path
+    local filename = opts.path or self:eval(node, "box.cfg.log")[1]
     local file = fio.open(filename, {'O_RDONLY', 'O_NONBLOCK'})
 
     local function fail(msg)
-- 
2.20.1 (Apple Git-117)