length check for usernames should take mysql version into consideration

Starting MariaDB 10.0.0, usernames are now 80 long.
Our mysql_user and mysql_grant types now take that into consideration.

This check is *opportunistic*. It will only take place if the
mysql_version fact is available. If that is not the case, it will be
skipped, leaving the database itself to deal with it, and returning its
error verbatim to our users, if it does fail.

Our fixed and extended tests assume this isn't the first run, and the
fact is already in place.

lib/puppet/type/mysql_grant.rb

@@ -78,7 +78,14 @@ Puppet::Type.newtype(:mysql_grant) do
         raise(ArgumentError, "Invalid database user #{value}")
       end
 
-      raise(ArgumentError, 'MySQL usernames are limited to a maximum of 16 characters') unless user_part.size <= 16
+      mysql_version = Facter.value(:mysql_version)
+      unless mysql_version.nil?
+        if Puppet::Util::Package.versioncmp(mysql_version, '10.0.0') < 0 and user_part.size > 16
+          raise(ArgumentError, 'MySQL usernames are limited to a maximum of 16 characters')
+        elsif Puppet::Util::Package.versioncmp(mysql_version, '10.0.0') > 0 and user_part.size > 80
+          raise(ArgumentError, 'MySQL usernames are limited to a maximum of 80 characters')
+        end
+      end
     end
   end
 

lib/puppet/type/mysql_user.rb

@@ -26,7 +26,14 @@ Puppet::Type.newtype(:mysql_user) do
         raise(ArgumentError, "Invalid database user #{value}")
       end
 
-      raise(ArgumentError, 'MySQL usernames are limited to a maximum of 16 characters') if user_part.size > 16
+      mysql_version = Facter.value(:mysql_version)
+      unless mysql_version.nil?
+        if Puppet::Util::Package.versioncmp(mysql_version, '10.0.0') < 0 and user_part.size > 16
+          raise(ArgumentError, 'MySQL usernames are limited to a maximum of 16 characters')
+        elsif Puppet::Util::Package.versioncmp(mysql_version, '10.0.0') > 0 and user_part.size > 80
+          raise(ArgumentError, 'MySQL usernames are limited to a maximum of 80 characters')
+        end
+      end
     end
 
     munge do |value|

spec/unit/puppet/provider/mysql_user/mysql_spec.rb

@@ -34,6 +34,7 @@ usvn_user@localhost
   before :each do
     # Set up the stubs for an instances call.
     Facter.stubs(:value).with(:root_home).returns('/root')
+    Facter.stubs(:value).with(:mysql_version).returns('5.6.24')
     Puppet::Util.stubs(:which).with('mysql').returns('/usr/bin/mysql')
     File.stubs(:file?).with('/root/.my.cnf').returns(true)
     provider.class.stubs(:mysql).with([defaults_file, '-NBe', "SELECT CONCAT(User, '@',Host) AS User FROM mysql.user"]).returns('joe@localhost')

spec/unit/puppet/type/mysql_user_spec.rb

@@ -2,10 +2,22 @@ require 'puppet'
 require 'puppet/type/mysql_user'
 describe Puppet::Type.type(:mysql_user) do
 
-  it 'should fail with a long user name' do
-    expect {
-      Puppet::Type.type(:mysql_user).new({:name => '12345678901234567@localhost', :password_hash => 'pass'})
-    }.to raise_error /MySQL usernames are limited to a maximum of 16 characters/
+  context "On MySQL 5.x" do
+    let(:facts) {{ :mysql_version => '5.6.24' }}
+    it 'should fail with a long user name' do
+      expect {
+        Puppet::Type.type(:mysql_user).new({:name => '12345678901234567@localhost', :password_hash => 'pass'})
+      }.to raise_error /MySQL usernames are limited to a maximum of 16 characters/
+    end
+  end
+
+  context "On MariaDB 10.0.0+" do
+    let(:facts) {{ :mysql_version => '10.0.19' }}
+    it 'should succeed with a long user name on MariaDB' do
+      expect {
+        Puppet::Type.type(:mysql_user).new({:name => '12345678901234567@localhost', :password_hash => 'pass'})
+      }.to raise_error /MySQL usernames are limited to a maximum of 16 characters/
+    end
   end
 
   it 'should require a name' do
@@ -60,6 +72,7 @@ describe Puppet::Type.type(:mysql_user) do
   end
 
   context 'using a quoted 16 char username' do
+    let(:facts) {{ :mysql_version => '5.6.24' }}
     before :each do
       @user = Puppet::Type.type(:mysql_user).new(:name => '"debian-sys-maint"@localhost', :password_hash => 'pass')
     end
@@ -70,6 +83,7 @@ describe Puppet::Type.type(:mysql_user) do
   end
 
   context 'using a quoted username that is too long ' do
+    let(:facts) {{ :mysql_version => '5.6.24' }}
     it 'should fail with a size error' do
       expect {
         Puppet::Type.type(:mysql_user).new(:name => '"debian-sys-maint2"@localhost', :password_hash => 'pass')