Add or fix comments

.travis.yml

@@ -13,6 +13,7 @@ git:
 env:
   global:
     - MEDIAWIKI_BRANCH=REL1_31
+    # Maximum iteration limit for loop
     - LOOP_LIMIT=300
 
 cache:
@@ -32,31 +33,42 @@ jobs:
         - composer test .
     - name: docker
       before_script:
+        # Setup files for database and memcached
         - git clone https://github.com/femiwiki/database.git ~/swarm --depth=1
         - sudo mkdir -p /srv/mysql/
+        # Prepare configuration files
         - cp configs/env.example configs/env
         - cp configs/secret.php.example configs/secret.php
+        # Tweak LocalSettings.php for debugging
         - echo -en "\n\nwfRunDebugMode( 'localhost' );\n" >> configs/LocalSettings.php
         - echo -en '\n\nrequire_once "$IP/includes/DevelopmentSettings.php";\n' >> configs/LocalSettings.php
+        # Initialize docker swarm
         - docker swarm init
-        # Setup database
+        # Start up database
         - docker stack deploy -c ~/swarm/database.yml database
+        # We need root password of the database, so wait for the generation
         - |
             printf 'Waiting for database_mysql service...';
+            # Set counter to check endless loop
             COUNTER=0;
             while [ -z $(docker service logs database_mysql 2>&1 | grep -oP 'GENERATED ROOT PASSWORD: \K.+') ]; do
+              # retry every 1 second.
               sleep 1;
+              # Append dots to the previous message if process is delayed.
               printf '.';
+              # Terminate Travis-ci if loop exceeds limit
               (( COUNTER++ ));
               if [ $COUNTER -gt $LOOP_LIMIT ]; then
                 printf '\n';
                 echo 'Falied to start database_mysql service';
+                # Print logs for debugging
                 docker service logs database_mysql;
                 travis_terminate 1;
               fi
             done; printf '\n'
-        # Setup memcached
+        # Start up memcached
         - docker stack deploy -c ~/swarm/memcached.yml memcached
+        # Configure mediawiki
         - HOST_IP=$(ip -4 addr show docker0 | grep -Po 'inet \K[\d.]+')
         - MYSQL_USER=root
         - "MYSQL_PW=$(docker service logs database_mysql 2>&1 | grep -Po 'GENERATED ROOT PASSWORD: \\K.+')"
@@ -73,7 +85,9 @@ jobs:
         # We don't have a health check yet, so wait a moment for starting process is end...
         - sleep 60
         - docker service logs mediawiki_fastcgi
+        # Check if container is shoutdown
         - test -z "$(docker service ps -qf "desired-state=Shutdown" mediawiki_fastcgi)"
+        # Access localhost until success
         - |
             printf 'Waiting for http...'
             COUNTER=0;