'os.name' value changed for OS VirtuozzoLinux

Facter 4.x changed the way the `os` facts are retrieved. Up to Facter 4.x (e.g. 3.14.20) `os.name` would return VirtuozzoLinux.

# facter --version

3.14.20 (commit 28fd6cc7adae74c7748502e4d18d34f75be92f93)

# facter os.name

VirtuozzoLinux

Starting with Facter 4.x `os.name` returns Virtuozzo instead.

# facter --version

4.2.5

# facter os.name

Virtuozzo

Content of `/etc/os-release` looks like this:

# cat /etc/os-release

NAME="Virtuozzo"

VERSION="7.5.1"

ID="virtuozzo"

ID_LIKE="rhel fedora"

VERSION_ID="7"

PRETTY_NAME="Virtuozzo release 7.5.1"

ANSI_COLOR="0;31"

CPE_NAME="cpe:/o:virtuozzoproject:vz:7"

HOME_URL="http://www.virtuozzo.com"

BUG_REPORT_URL="https://bugs.openvz.org/"

Changing `NAME=` to VirtuozzoLinux makes Facter return the "correct" value which is used by community modules (e.g. 'voxpupuli/puppet-yum').

In order to avoid changing Puppet manifests, Hiera lookups, and various metadata files please restore the previous behavior / return value.

—

Side note: I tried overwriting `os.name` using a custom fact, but since Facter 4.1.0 (FACT-3004) it seems not working anymore - at least with this code (copied from a comment in FACT-2958):

Facter.add('os.name', type: :structured) do

  has_weight(10)

  setcode { 'custom_fact' }

end

Haven't tried yet changing the config option.

Is there any other method to overwrite core facts?