File obs-server-2.9-0031-ci-Make-test-backend-crash-more-prominent.patch of Package obs-server

From fa2bd3dc2e2a9eb908942d7a72bf87f7a331c780 Mon Sep 17 00:00:00 2001
From: Oleg Girko <ol@infoserver.lv>
Date: Mon, 15 Oct 2018 00:49:01 +0100
Subject: [PATCH] [ci] Make test backend crash more prominent.

Before this change test backend crashes were silent.
All backends were keeping working, just their output was
not logged anymore, and some tests were failing for
non-obvious reasons.

This change fixes this "swipe under rug" approach.
A thread is started that keeps monitoring test backend's output
after backend reported that its initialisation is complete with
"DONE NOW" output line.
If test backend has finished prematurely, EOF condition is detected
by that thread, backend is marked as dead and exception is raised.
All subsequent attempts to start test backend are prevented
by raising the same exception.

This doesn't cause the whole test suite to fail fast, but at least,
it makes problems with crashed test backend prominent enough
to attract attention.

Signed-off-by: Oleg Girko <ol@infoserver.lv>
---
 src/api/lib/backend/test.rb | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/api/lib/backend/test.rb b/src/api/lib/backend/test.rb
index 0d1963fd1b..6a80916339 100644
--- a/src/api/lib/backend/test.rb
+++ b/src/api/lib/backend/test.rb
@@ -6,14 +6,20 @@ module Backend
     # Starts the test backend
     def self.start(options = {})
       return unless Rails.env.test?
-      return if @backend
+      if @backend
+        raise 'Backend died' if @backend == :backend_died
+        return
+      end
       return if ENV['BACKEND_STARTED']
       print 'Starting test backend...'
       @backend = IO.popen("#{Rails.root}/script/start_test_backend")
       Rails.logger.debug "Test backend started with pid: #{@backend.pid}"
       loop do
         line = @backend.gets
-        raise 'Backend died' unless line
+        unless line
+          @backend = :backend_died
+          raise 'Backend died'
+        end
         break if line =~ /DONE NOW/
         Rails.logger.debug line.strip
       end
@@ -21,9 +27,23 @@ module Backend
       CONFIG['global_write_through'] = true
       WebMock.disable_net_connect!(allow_localhost: true)
       ENV['BACKEND_STARTED'] = '1'
+      backend_done = false
+      backend_logger = Thread.new do
+        loop do
+          line = @backend.gets
+          unless line
+            break if backend_done
+            @backend = :backend_died
+            raise 'Backend died'
+          end
+        end
+      end
+      backend_logger.abort_on_exception = true
       at_exit do
+        backend_done = true
         puts 'Killing test backend'
         Process.kill 'INT', @backend.pid
+        backend_logger.join
         @backend = nil
       end
 
-- 
2.20.1