Merge branch 'case_sensitivity' into 'master'

Case Sensitivity for MYSQL

#1014

app/models/namespace.rb

@@ -27,7 +27,7 @@ class Namespace < ActiveRecord::Base
             format: { with: Gitlab::Regex.name_regex,
                       message: "only letters, digits, spaces & '_' '-' '.' allowed." }
   validates :description, length: { within: 0..255 }
-  validates :path, uniqueness: true, presence: true, length: { within: 1..255 },
+  validates :path, uniqueness: { case_sensitive: false }, presence: true, length: { within: 1..255 },
             exclusion: { in: Gitlab::Blacklist.path },
             format: { with: Gitlab::Regex.path_regex,
                       message: "only letters, digits & '_' '-' '.' allowed. Letter should be first" }

app/models/user.rb

@@ -109,7 +109,7 @@ class User < ActiveRecord::Base
   validates :bio, length: { maximum: 255 }, allow_blank: true
   validates :extern_uid, allow_blank: true, uniqueness: {scope: :provider}
   validates :projects_limit, presence: true, numericality: {greater_than_or_equal_to: 0}
-  validates :username, presence: true, uniqueness: true,
+  validates :username, presence: true, uniqueness: { case_sensitive: false },
             exclusion: { in: Gitlab::Blacklist.path },
             format: { with: Gitlab::Regex.username_regex,
                       message: "only letters, digits & '_' '-' '.' allowed. Letter should be first" }

doc/install/databases.md → doc/install/database_mysql.md

-# Setup Database
-
-GitLab supports the following databases:
-
-* MySQL (preferred)
-* PostgreSQL
+## Note
 
+We do not recommend using MySQL due to various issues. For example, case [(in)sensitivity](https://dev.mysql.com/doc/refman/5.0/en/case-sensitivity.html) and [problems](http://bugs.mysql.com/bug.php?id=65830) that [suggested](http://bugs.mysql.com/bug.php?id=50909) [fixes](http://bugs.mysql.com/bug.php?id=65830) [have](http://bugs.mysql.com/bug.php?id=63164).
 
 ## MySQL
 
@@ -47,25 +43,3 @@ GitLab supports the following databases:
     mysql> \q
 
     # You are done installing the database and can go back to the rest of the installation.
-
-
-## PostgreSQL
-
-    # Install the database packages
-    sudo apt-get install -y postgresql-9.1 postgresql-client libpq-dev
-
-    # Login to PostgreSQL
-    sudo -u postgres psql -d template1
-
-    # Create a user for GitLab.
-    template1=# CREATE USER git;
-
-    # Create the GitLab production database & grant all privileges on database
-    template1=# CREATE DATABASE gitlabhq_production OWNER git;
-
-    # Quit the database session
-    template1=# \q
-
-    # Try connecting to the new database with the new user
-    sudo -u git -H psql -d gitlabhq_production
-

doc/install/installation.md

@@ -144,7 +144,25 @@ GitLab Shell is an ssh access and repository management software developed speci
 
 # 5. Database
 
-To setup the MySQL/PostgreSQL database and dependencies please see [doc/install/databases.md](./databases.md).
+We recommend using a PostgreSQL database. For MySQL check [MySQL setup guide](doc/install/database_mysql.md).
+
+    # Install the database packages
+    sudo apt-get install -y postgresql-9.1 postgresql-client libpq-dev
+
+    # Login to PostgreSQL
+    sudo -u postgres psql -d template1
+
+    # Create a user for GitLab.
+    template1=# CREATE USER git;
+
+    # Create the GitLab production database & grant all privileges on database
+    template1=# CREATE DATABASE gitlabhq_production OWNER git;
+
+    # Quit the database session
+    template1=# \q
+
+    # Try connecting to the new database with the new user
+    sudo -u git -H psql -d gitlabhq_production
 
 
 # 6. GitLab