Error running cfn-lint with pipe (|)

cfn-lint version: v0.23.0

Hello we have a problem running cfn-lint with find command. Only this version is affected as far as we know. We are keeping couple of template is a folder and linting them like that:

find ./templates -type f | xargs cfn-lint -f parseable -c I -t

It worked flawlessly before but with the new update we are getting this error:

2019-08-02 15:37:01,818 - cfnlint.decode - ERROR - Template file not found: None None:1:1:1:2:E0000:Template file not found: None

Splitting the files in separated lines with xargs -L 1 doesn’t help.

If you run the cfn-lint command on it’s own it works as expected.

This example doesn’t work:

find ./templates -type f | xargs -t cfn-lint -f parseable -c I -t
cfn-lint -f parseable -c I -t ./templates/t1.yml ./templates/t2.yml ./templates/t3.yml 
2019-08-02 15:50:20,891 - cfnlint.decode - ERROR - Template file not found: None
None:1:1:1:2:E0000:Template file not found: None

This example works:

cfn-lint -f parseable -c I -t ./templates/t1.yml ./templates/t2.yml ./templates/t3.yml

Regards TT

[kddejong]

@ns-cweber this fix does appear to work for your use case too. Added a test to prevent this from happening again. Should have a fix out shortly.

[Trandel]

Thanks a lot guys I can confirm

cfn-lint -f parseable -c I -t ./templates/*

works like a charm, we will use it now instead of find.