docker-env cant detect shell in github actions ubuntu VM

[medyagh]

on integration tests in github actions minikube docker-env can not detect the shell
link to full logs https://github.com/kubernetes/minikube/suites/459846392/artifacts/1883061

=== RUN   TestFunctional/parallel/DockerEnv
=== PAUSE TestFunctional/parallel/DockerEnv
=== CONT  TestFunctional/parallel/DockerEnv
--- FAIL: TestFunctional/parallel/DockerEnv (0.37s)
functional_test.go:125: (dbg) Run:  /bin/bash -c "eval $(./minikube-linux-amd64 -p functional-20200215T014938.120977049-2685 docker-env) && ./minikube-linux-amd64 status -p functional-20200215T014938.120977049-2685"
functional_test.go:125: (dbg) Non-zero exit: /bin/bash -c "eval $(./minikube-linux-amd64 -p functional-20200215T014938.120977049-2685 docker-env) && ./minikube-linux-amd64 status -p functional-20200215T014938.120977049-2685": exit status 1 (372.293742ms)
** stderr ** 
* 
X Error detecting shell: Error: Unknown shell
* 
* minikube is exiting due to an error. If the above message is not useful, open an issue:
- https://github.com/kubernetes/minikube/issues/new/choose
/bin/bash: eval: line 0: unexpected EOF while looking for matching `''
/bin/bash: eval: line 1: syntax error: unexpected end of file
** /stderr **
functional_test.go:127: Failed to do minikube status after eval-ing docker-env exit status 1

The workflow Yaml file section:

    - name: Run integration test
      continue-on-error: true
      # bash {0} to allow test to continue to next step. in case of
      shell: bash {0}
      run: |
        cd minikube_binaries
        mkdir -p report
        mkdir -p testhome
        chmod a+x e2e-*
        chmod a+x minikube-*
        START_TIME=$(date -u +%s)
        KUBECONFIG=$(pwd)/testhome/kubeconfig MINIKUBE_HOME=$(pwd)/testhome ./e2e-linux-amd64 -minikube-start-args=--vm-driver=docker -expected-default-driver= -test.timeout=70m -test.v -binary=./minikube-linux-amd64 2>&1 | tee ./report/testout.txt
        END_TIME=$(date -u +%s)
        TIME_ELAPSED=$(($END_TIME-$START_TIME)) 
        min=$((${TIME_ELAPSED}/60))
        sec=$((${TIME_ELAPSED}%60))
        TIME_ELAPSED="${min} min $sec seconds "
        echo ::set-env name=TIME_ELAPSED::${TIME_ELAPSED}

[afbjorklund]

@medyagh : we are using libmachine for this, and it just looks at $SHELL

https://github.com/docker/machine/blob/master/libmachine/shell/shell.go

So you probably want to set SHELL=/bin/bash in the environment ?

Since you have already selected bash, as the runner shell: bash