This may help: containers/podman#3323

Use any Dockerfile and

podman run --rm -i docker.io/hadolint/hadolint:2.6.0-debian < .

This does not work on my Docker hosts either, meaning if I run your thing in Docker, it does not return anything, too, same as podman.

I believe what you might have meant to do with the command is to pass it just the Dockerfile instead of whole ., like so:
podman run --rm -i docker.io/hadolint/hadolint:2.6.0-debian < Dockerfile

For the record, the above works with both Docker version 20.10.8, build 3967b7d28e and podman version 3.3.1.

Hi @tschm

I also use Podman. The following script hadolint is in my $PATH and runs the current downloaded image docker.io/hadolint/hadolint:

#!/bin/bash
dockerfile="$1"
shift
podman run --rm -i docker.io/hadolint/hadolint hadolint "$@" - < "$dockerfile"

This script hadolint need to be used in this way:

hadolint path/to/your/Dockerfile [OPTIONS]

I sometimes upgrade my local image docker.io/hadolint/hadolint:

podman pull docker.io/hadolint/hadolint

I think this a good way to securely rum Hadolint with upgrade ease.

Moreover, this script works fine with the current version of the extension vscode-hadolint
https://github.com/michaellzc/vscode-hadolint

Note: I also use vscodium.com + open-vsx.org

Hi @lorenzo

Would you mind if the README explains how to use Hadolint with Podman?
You may also share the tips from my previous message.

Thank you for maintaining Hadolint. 😄

Your contribution will be very welcomed @0uep :)