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Release Notes:
Enhancement
Release Notes Summary:

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The `puppet facts diff` CLI command was improved by showing all differences between Facter 3 and Facter 4 (including facts available only in Facter 4), sorting output results in alphabetical order for better human readability, allowing users to remove certain facts from output (via the `--exclude <regex>` CLI option) and including a CLI option to see results in a fully structured form.

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The `puppet facts diff` CLI command was improved by showing all differences between Facter 3 and Facter 4 (including facts available only in Facter 4), sorting output results in alphabetical order for better human readability, allowing users to remove certain facts from output (via the `--exclude <regex>` CLI option) and including a CLI option to see results in a fully structured form.

The Problem

Given the following facts

Given the following facts:

cat /opt/puppetlabs/facter/facts.d/foo.bar.txt

foo.bar=true

cat /opt/puppetlabs/facter/facts.d/c.d.json

  "c.d":

    "foo": 4

cat /opt/puppetlabs/facter/facts.d/bar.json

  "bar":

    "e.f": 5

cat /opt/puppetlabs/facter/facts.d/a.b.txt

a.b=3

you'll get output from `puppet facts diff` like this:

[root@master20198-latest-centos ~]# puppet facts diff | python -m json.tool

    "a.b": {

        "new_value": null,

        "old_value": "3"

},

    "c.d.foo": {

        "new_value": null,

        "old_value": 4

},

    "foo.bar": {

        "new_value": null,

        "old_value": "true"

},

...

which does not show that there are new facts "a", "c" and "foo" in Facter 4.

`puppet facts diff` does not output facts that only exist in Facter 4