postfix-install.sh

#!/usr/bin/env bash
fn_distro(){
    arch=$(uname -m)
    kernel=$(uname -r)
    if [ -f /etc/lsb-release ]; then
            os=$(lsb_release -s -d)
        installer='apt-get'
    elif [ -f /etc/debian_version ]; then
            os="Debian $(cat /etc/debian_version)"
        installer='apt-get'
    elif [ -f /etc/redhat-release ]; then
            os=`cat /etc/redhat-release`
        installer='yum'
    else
            os="$(uname -s) $(uname -r)"
    fi
}

fn_distro

echo "Setting postfix"
echo "current hostname is: $(hostname) Is this the correct FQDN ?[Y/n]"
read -e -n 1 yes_no
if [[ $yes_no == "n" ]];then
    echo "please enter the correct hostname:"
    read -e myhostname
elif [[ $yes_no == "y" || ! -n $yes_no || -z $yes_no ]];then
    echo "proceeding with the following hostname: $(hostname)"
    myhostname=`hostname`
fi

echo "Enter the domain which mail should be sent as:"
read -e mymaildomain
if [ -z $mymaildomain ];then
    echo "You must have a domain name to send mail as"
    exit 1;
fi

echo "Please enter any networks that you want to allow postfix to use. seperate with spaces ie. 172.16.0.0/16 10.0.0.0/8"
echo "default networks are localhost host only. Just press enter for localhost"
read -e mynetworks
if [[ ! -n $mynetworks || -z $mynetworks ]];then
    mynetworks=""
fi

echo "setting up chef"
mkdir -p /var/chef-solo/cookbooks
mkdir -p /var/chef-solo/attributes
mkdir -p /var/chef-solo/cache
echo '
file_cache_path "/var/chef-solo/cache"
cookbook_path "/var/chef-solo/cookbooks"
json_attribs "/var/chef-solo/attributes/node.json"
' > /var/chef-solo/solo.rb

echo "Installing GIT"
if [ $installer == 'apt-get' ];then
echo "my installer is: $installer"
	apt-get install -y git
elif [ $installer == 'yum' ];then
echo "my installer is: $installer"
	yum install git
else
  echo "OS isn't supported"
  exit 1
fi

echo "Installing Chef"
`curl -L https://www.opscode.com/chef/install.sh | bash`
echo "fetching cookbooks"
git clone https://github.com/chef-cookbooks/postfix.git /var/chef-solo/cookbooks/postfix

echo -e "
{
  \"postfix\": {
    \"mail_type\": \"master\",
    \"main\": {
      \"myhostname\": "\"$myhostname\"",
      \"mydomain\": "\"$mymaildomain\"",
      \"mynetworks\": [
        \"127.0.0.0/8\",
        \"[::1]/128\",
        \"[fe80::]/10\",
        \""$mynetworks\""
      ],
      \"mydestination\": \"\",
      \"inet_interfaces\": \"loopback-only\"
    }
  },
  \"run_list\": [ \"recipe[postfix]\"]
}
" > /var/chef-solo/attributes/node.json

echo "Running Provisioning"
chef-solo -c /var/chef-solo/solo.rb