Error building images when in metadata file is used centos as parameter for "from" field

[jmbelvar81]

Hello,

Creating the metadata file to build images , if you use Centos as distribution, by example:

cmd: "/usr/sbin/apache2,-DFOREGROUND"
expose: 80
image_name: puppetdocker/apachetest
from: centos

The next error is obtained, the URL to obtain the rpm is incorrect. The #{@context[:os_version]} is "null" and because of this the URL is badly generated:

curl: (22) The requested URL returned error: 404 Not Found
error: skipping https://yum.puppetlabs.com/puppet5/puppet5-release-el-.noarch.rpm - transfer failed

If you define the tag for your image, the error is solved. By example, next metadata solve the problem:

cmd: "/usr/sbin/apache2,-DFOREGROUND"
expose: 80
image_name: puppetdocker/apachetest
from: centos:7

My OS is Ubuntu 17.10 artful and I'm using the 0.7.0 for the puppetlabs-image_build