"Cannot read properties of null (reading 'toString')" when hadolint binary is not executable

[wb-joona]

Describe the bug When the hadolint binary is missing execution permissions or is just missing completely, the extension blows up with hadolint: Cannot read properties of null (reading 'toString'). A more helpful error message could be more user friendly.

To Reproduce Steps to reproduce the behavior:

1. Download the hadolint 2.10.0 binary into your $PATH
2. Try to lint a Dockerfile
3. Error
4. Grant execute permissions on hadolint binary
5. Lint Dockerfle
6. Works

Expected behaviour I would expect the extension to tell me that something went wrong when executing the hadolint binary, instead of blowing up internally.

Environment and version (please complete the following information):

• hadolint: Haskell Dockerfile Linter 2.10.0
• OS: Ubuntu 20.04

Debug information

Provide all output from hadolint (in the output console) while having an opened Dockerfile in VS Code.

It should produce something like this

[hadolint(1003) file:///workspace] Started and initialize received
[hadolint(1003) file:///workspace] Document is opened: file:///workspace/Dockerfile.prod
[hadolint(1003) file:///workspace] Document is changed: file:///workspace/Dockerfile.prod
[hadolint(1003) file:///workspace] Current settings: {"hadolintPath":"/home/user/.bin/hadolint","cliOptions":["--no-color"],"maxNumberOfProblems":100,"outputLevel":"warning"}
[hadolint] Running /home/user/.bin/hadolint /workspace/Dockerfile.prod --no-color in /workspace

Additional context

[braisF]

Hi there, same problem here.

I've been reviewing the extension configuration but I didn't found where the problem is.

I'm using VSCode in Windows with the default configuration.