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# docker-companion [](https://travis-ci.org/mudler/docker-companion)
docker-companion is a candy mix of tools for docker written in Golang and directly using Docker API calls. As for now it allows to squash and unpack an image.
## Reinventing the wheel?
Problem arises with current tools to squash/unpack images since mostly of them are scripted. I personally needed a static implementation with no-deps hell that i could use in my CI pipeline easily (and also to get the job done).
## Download and unpack image
Note: Doesn't require a docker daemon running on the host.
docker-companion download my-awesome-image /unpacked_rootfs
Downloads and reconstruct all the image layers,
unpacking the content to the directory given as second argument.
## Squash an image
The resulting image will loose metadata, but it is handy to reduce image size:
docker-companion squash my-awesome-image my-awesome-image-squashed
You can also make it pull before squashing it:
docker-companion --pull squash my-awesome-image my-awesome-image-squashed:mytag
Or just squashing an image
docker-companion squash my-awesome-image
to directly remove the intermediary (the source image, which will loose the tag)
docker-companion squash --remove my-awesome-image
## Unpack an image
docker-companion unpack my-awesome-image /my/path
The path must be absolute, and you must run it with root permission to keep file permissions.
You can squash the image right before unpacking it too:
docker-companion --pull unpack --squash my-awesome-image /my/path
It can be handy sometimes to squash the image before unpacking it (very few cases where the latter fails)
You can supply also the --fatal global option to treat all warnings as fatal:
docker-companion --fatal --pull unpack --squash my-awesome-image /my/path
## Get Latest release from github for amd64
```bash
curl -s https://api.github.com/repos/mudler/docker-companion/releases/latest \
| grep "browser_download_url.*amd64" \
| cut -d : -f 2,3 \
| tr -d \" \
| wget -i - -O docker-companion
```
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