Hi,

I'm author of the tool spline: https://github.com/Nachtfeuer/pipeline
I'm working on extending spline for a packer task like following:

$ cat examples/packer.yaml
model:
    image: centos:7

pipeline:
    - stage(Example):
        - tasks(ordered):
            - packer:
                script: |
                  {
                    "builders": [{
                        "type": "docker",
                        "image": "{{ model.image }}",
                        "commit": true,
                        "changes": [
                            "LABEL pipeline={{ env.PIPELINE_PID }}",
                            "LABEL pipeline-stage={{ env.PIPELINE_STAGE }}"
                        ]
                    }],

                    "provisioners": [{
                        "type": "shell",
                        "inline": [
                            "yum -y install python-setuptools",
                            "easy_install pip",
                            "pip install tox"
                        ]
                    }],

                    "post-processors": [{
                        "type": "docker-tag",
                        "repository": "spline/packer/demo",
                        "tag": "0.1"
                    }]
                  }


This works fine. However ... when coming to unit/regression tests I 
detected following issue:

Running via tox (wrapper for Python virtual environment) the unittest for 
the Packer task the Packer build complains about this:
    *~/.packer.d/tmp/packer-docker735583400" includes invalid characters 
for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed*

I also can run the one test without tox and no problem arrives: 
   * PYTHONPATH=$PWD python -m unittest discover -v -s tests -p 
"test_packer.py"*

The Packer build command is following:
*packer build -parallel=true -on-error=cleanup /tmp/packer-USh6y4.json*

Is it possible to tell packer to use another root path like current folder 
or /tmp without special characters?
(ot at least it should be ensured that the full path is used)

I'm uisng Packer 1.2.1 and Docker 17.12.1-ce

Regards,
Thomas

My question now: what can I d


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