I need a Docker image which contains a Linux executable where I can pipe an input file into when running it like this:

docker run --rm -i myContainer < myInputFile > myOutputFile

In my case it is the executable cucumber-json-formatter-linux-386 which converts NDJSON Cucumber messages into a JSON file (to be used e.g. for Xray).

Why Docker?

• There is also a Windows executable available, but our security software says it contains a virus.
• So I can’t download it, but to be honest, I also don’t trust it.
• I need something something OS indepedent, also running in CI, etc.

Why convert?

Cucumber can output JSON directly. But I am using @badeball/cypress-cucumber-preprocessor which only can output NDJSON and needs me to use that binary to convert it into JSON. @badeball wrote “I've refactored my implementation to output messages, because that was significantly easier implementation wise”. So it’s not Cucumber writing those NDJSON messages here.

CodePudding user response：

Assuming you already have installed Docker, create a folder containing the following file called “Dockerfile”:

FROM ubuntu
COPY cucumber-json-formatter-linux-386 /bin/formatter
ENTRYPOINT /bin/formatter

Also copy the binary (cucumber-json-formatter-linux-386) into the same folder.

Then cd into that folder and build the container like this:

docker build -t cucumber-json-formatter .

Now you can run the container like this:

docker run --rm -i cucumber-json-formatter < input.ndjson > output.json

• The argument --rm removes the container after usage.
• The argument -i is needed to correctly process the input (not sure why, though).

I tried this on a Windows host, but should work the same on Linux.

CodePudding user response：

Nice to see that you figured out a simple solution by yourself.

As part of the cucumber team, I would like to ask: why do you need the cucumber-json-formatter? I understood that you need it to convert NDJSON messages into the "legacy" JSON format.

What don't you generate the JSON directly from cucumber itself?

I know, at some point we have deprecated the JSON formatter. But it is not the case anymore, you will be able to rely on it in future version, as usual