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Hi,

We are seeing a new behavior with Fn::Join in user-data block that makes 
our script fail to run. Previous behavior was that no white space nor 
line breaks were inserted after a coma (',') or line ends. But now it's 
inserting white space plus line break after ',' separated elements... Do 
you have any idea why?
Thanks
Patrick

_Exemple_:

"Fn::Join":[
                      "\n",
                      [
                         "#!/bin/bash -v",
                         "# Helper function",
                         "function error_exit\n",
                         "{\n",
                         "  /opt/aws/bin/cfn-signal -e 1 -r \"$1\" '", { 
"Ref" : "BatchNodeWaitHandle" }, "'\n",
                         "  exit 1\n",
                         "}\n",

                         "# Flush iptables's default rules",
                         "/sbin/iptables -F",
                         "/sbin/iptables -X",
                         "# prepare for packages install",
                         "yum update -y",
                         "yum upgrade -y",
                         "export http_proxy=ecfrec.frec.bull.fr:8080",
                         "export 
no_proxy=127.0.0.1,localhost,.amg.net.pl,169.254.169.254,10.197.217.62",

                         "/opt/aws/bin/cfn-init -s ", { "Ref" : 
"AWS::StackName" },
                         " -r BatchNode ",
                         " --region ", { "Ref" : "AWS::Region" },
                         " || error_exit 'Failed to run cfn-init for 
BatchNode'\n",

                         "rpm -Uvh http://rbel.frameos.org/rbel6",
                         "#install rubygems",
                         "cd /opt",
                         "tar zxf rubygems-1.8.10.tgz",
                         "cd rubygems-1.8.10",
                         "ruby setup.rb --no-format-executable",
                         "gem install chef --no-ri --no-rdoc",
                         "/opt/aws/bin/cfn-signal -e $? '", { 
"Ref":"BatchNodeWaitHandle" }, "'"
                      ]
                   ]

_Results in broken __cfn-userdata script_

#!/bin/bash -v
# Helper function

function error_exit

{

   /opt/aws/bin/cfn-signal -e 1 -r "$1" '
http://172.16.1.1:8002/stacks/1a7b8501-e117-4cf8-9838-416446a43fed/resources/BatchNodeWaitHandle
'

   exit 1

}


# Flush iptables's default rules
/sbin/iptables -F
/sbin/iptables -X
# prepare for packages install
yum update -y
yum upgrade -y
export http_proxy=ecfrec.frec.bull.fr:8080
export 
no_proxy=127.0.0.1,localhost,.amg.net.pl,169.254.169.254,10.197.217.62
/opt/aws/bin/cfn-init -s
skeleton
  -r BatchNode
  --region
ap-southeast-1
  || error_exit 'Failed to run cfn-init for BatchNode'
rpm -Uvh http://rbel.frameos.org/rbel6
#install rubygems
cd /opt
tar zxf rubygems-1.8.10.tgz
cd rubygems-1.8.10
ruby setup.rb --no-format-executable
gem install chef --no-ri --no-rdoc
/opt/aws/bin/cfn-signal -e $? '
http://172.16.1.1:8002/stacks/1a7b8501-e117-4cf8-9838-416446a43fed/resources/BatchNodeWaitHandle
'
touch /var/lib/cloud/instance/provision-finished

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