Fail import docker image to contain multiple images

[ukinau]

If you try to import the docker image to contain multiple images, like as followings.

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              latest              c73a085dc378        5 weeks ago         127.1 MB
ubuntu              14.04               f2d8ce9fa988        5 weeks ago         187.9 MB

$ docker save ubuntu | gzip - > ubuntu.tar.gz

ubuntu.tar.gz contains 2 images 'ubuntu:latest' and 'ubuntu:14.04'.

$ tar -zxf ubuntu.tar.gz repositories  -O | jq .
{
  "ubuntu": {
    "latest": "9d2e5c12a9428108649812c24645eba52c030507a74c891984b3fb7f218d7690",
    "14.04": "e5db79ecb021272090388a7b2999748fe2534fce2a633f786a67441b283b4c87"
  }
}

On above conditions, if you try to import ubuntu.tar.gz with marten, it will fail with following error

$ sudo mincs/marten import ubuntu.tar.gz
Importing image: ubuntu
jq: error: Cannot index number with string
parse error: Invalid numeric literal

I don't thinks we need to load multiple images at once, but at least we need to logs to indicate it can't load multiple images at once to keep implementation with simple.

[mhiramat]

Hmm, at this point, marten only supports single version(tagged) image, not multiple version. But it seems better to consider as an enhancement idea.
Thank you,