Autograding. Error message: 795: unexpected token at '---'

[ronzalo]

Context

AutoGrading a quiz with a ruby script and localDocker

Expected Behavior

Autodriver ouput writed correctly

Actual Behavior

Ruby puts output isn' writted

Possible solution

In https://github.com/autolab/Tango/blob/master/vmms/localDocker.py#L141, use autolab > output/feedback 2>&1 instead autolab &> output/feedback

[s-wallace]

I can reproduce this problem as well; the localDocker call seems to work fine with an autograding image built on ubuntu 14.04, but not on 18.04 here are a few more details:

• sh is invoked by localDocker which is dash 0.5.7 on ubuntu 14.04 and dash 0.5.8 on ubuntu 18.04
• autolab &> output/feedback isn't strictly supported in dash (see https://wiki.ubuntu.com/DashAsBinSh)

to reproduce:

1. build a docker autograding image based on ubuntu 14.04 (the current Dockerfile in Tango/vmms will work)
2. build a second based on unbuntu 18.04
3. run the command issued by localDocker, mine looks like:

docker run --rm --name grader -v <pathwithsubmission>:/home/mount autograding_image sh -c \
'cp -r mount/* autolab/; su autolab -c "autodriver -u 100 -f 1048576 -t 10 -o 524288 \
autolab &> output/feedback"; cp output/feedback mount/feedback'

This command works fine for me on a 14.04 image, and produces no output on a 18.04 image

4. run the proposed command:

docker run --rm --name grader -v <pathwithsubmission>:/home/mount autograding_image sh -c \
'cp -r mount/* autolab/; su autolab -c "autodriver -u 100 -f 1048576 -t 10 -o 524288 \
autolab > output/feedback 2>&1"; cp output/feedback mount/feedback'

This produces correct output for both images.

[fanpu]

Confirming that this works

[fanpu]

Fix now in master