[Tarantool-patches] [PATCH 1/2] feedback: determine runtime platform info

[Ilya Konyukhov <runsfor@gmail.com>]

This patch detect which platform instance is running on.
It uses luajit `jit` module to get OS name and architecture.
Se more in [docs page](https://luajit.org/ext_jit.html).

Also it tries to figure out whether instance is running
inside docker container or not. It's difficult know
accurately but one of the most stable and simple ways
at the same time is to look in
[`/proc/1/cgroup`](https://stackoverflow.com/a/20012536/1881632)
file.

Closes #3608
Related to #4943
---
 cmake/os.cmake                        |  2 +-
 src/box/lua/feedback_daemon.lua       | 29 ++++++++++++++++++++++++++-
 test/box-tap/feedback_daemon.test.lua |  3 +--
 3 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/cmake/os.cmake b/cmake/os.cmake
index 905be61df..462bdccc3 100644
--- a/cmake/os.cmake
+++ b/cmake/os.cmake
@@ -78,7 +78,7 @@ elseif (${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
 
 #
 # Default build type is None, which uses depends by Apple
-# command line tools. Also supportting install with MacPorts.
+# command line tools. Also supporting install with MacPorts.
 #
     if (NOT DARWIN_BUILD_TYPE)
         set(DARWIN_BUILD_TYPE None CACHE STRING
diff --git a/src/box/lua/feedback_daemon.lua b/src/box/lua/feedback_daemon.lua
index 95130d696..2ce49fb22 100644
--- a/src/box/lua/feedback_daemon.lua
+++ b/src/box/lua/feedback_daemon.lua
@@ -26,13 +26,40 @@ local function get_fiber_id(f)
     return fid
 end
 
-local function fill_in_feedback(feedback)
+local function detect_docker_environment()
+    local fh = fio.open('/proc/1/cgroup', {'O_RDONLY'})
+    if not fh then return false end
+
+    -- fh:read() doesn't read empty files
+    local big_enough_chunk = 4096
+    local ok = fh:read(big_enough_chunk)
+    fh:close()
+    if not ok then return false end
+
+    if not string.find(ok, 'docker') then return false end
+
+    return true
+end
+
+local function fill_in_base_info(feedback)
     if box.info.status ~= "running" then
         return nil, "not running"
     end
     feedback.tarantool_version = box.info.version
     feedback.server_id         = box.info.uuid
     feedback.cluster_id        = box.info.cluster.uuid
+end
+
+local function fill_in_platform_info(feedback)
+    feedback.os        = jit.os
+    feedback.arch      = jit.arch
+    feedback.is_docker = detect_docker_environment()
+end
+
+local function fill_in_feedback(feedback)
+    fill_in_base_info(feedback)
+    fill_in_platform_info(feedback)
+
     return feedback
 end
 
diff --git a/test/box-tap/feedback_daemon.test.lua b/test/box-tap/feedback_daemon.test.lua
index d4adb71f1..c36b2a694 100755
--- a/test/box-tap/feedback_daemon.test.lua
+++ b/test/box-tap/feedback_daemon.test.lua
@@ -131,5 +131,4 @@ daemon.start()
 daemon.send_test()
 daemon.stop()
 
-test:check()
-os.exit(0)
+os.exit(test:check() and 0 or 1)
-- 
2.24.3 (Apple Git-128)