How to workaround “the input device is not a TTY”

Question

When issuing grunt shell:test, I'm getting warning "the input device is not a TTY" & don't want to have to use -f:

$ grunt shell:test
Running "shell:test" (shell) task
the input device is not a TTY
Warning: Command failed: /bin/sh -c ./run.sh npm test
the input device is not a TTY
 Use --force to continue.

Aborted due to warnings.

Here's the Gruntfile.js command:

shell: {
  test: {
    command: './run.sh npm test'
  }

Here's run.sh:

#!/bin/sh
# should use the latest available image to validate, but not LATEST
if [ -f .env ]; then
  RUN_ENV_FILE='--env-file .env'
fi
docker run $RUN_ENV_FILE -it --rm --user node -v "$PWD":/app -w /app yaktor/node:0.39.0 $@

Here's the relevant package.json scripts with command test:

"scripts": {
  "test": "mocha --color=true -R spec test/*.test.js && npm run lint"
}

How can I get grunt to make docker happy with a TTY? Executing ./run.sh npm test outside of grunt works fine:

$ ./run.sh npm test

> yaktor@0.59.2-pre.0 test /app
> mocha --color=true -R spec test/*.test.js && npm run lint


[snip]

  105 passing (3s)


> yaktor@0.59.2-pre.0 lint /app
> standard --verbose

Answer 1

This solved an annoying issue for me. The script had these lines:

docker exec **-it**  $( docker ps | grep mysql | cut -d' ' -f1)  mysql --user= ..... > /var/tmp/temp.file
mutt -s "File is here" [e-mail] < /var/tmp/temp.file

The script would run great if run directly and the mail would come with the correct output. However, when run from cron, (crontab -e) the mail would come with no content. Tried many things around permissions and shells and paths etc. However no joy!

Finally found this:

*/20 * * * * scriptblah.sh > $HOME/cron.log 2>&1

And on that cron.log file found this output:

the input device is not a TTY

Search led me here. And after I removed the -t, it's working great now!

docker exec **-i**  $( docker ps | grep mysql | cut -d' ' -f1)  mysql --user= ..... > /var/tmp/temp.file

Answer 2

Remove the -t from the docker run command:

docker run $RUN_ENV_FILE -i --rm --user node -v "$PWD":/app -w /app yaktor/node:0.39.0 $@

The -t tells docker to configure the tty, which won't work if you don't have a tty and try to attach to the container (default when you don't do a -d).