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Re: [atomic-devel] ostree-docker-builder

Hi Clayton,

thanks for the feedback, I am going to look into this.


Clayton Coleman <ccoleman redhat com> writes:

> Can we get this into Openshift as a new builder strategy / or source?
> It's an excellent story for non-root builds.
>> On Sep 30, 2015, at 9:01 PM, Giuseppe Scrivano <gscrivan redhat com> wrote:
>> Hello,
>> I was experimenting for fun with creating Docker images using rpm-ostree
>> instead of "docker build".  rpm-ostree already supports it, and it can
>> be specified in the .json file setting the "container" flag to true.
>> The generated tree can be tarred and imported directly into Docker.
>> I wrote a small program to simplify the generation of the image,
>> available on github:
>> https://github.com/giuseppe/ostree-docker-builder
>> The commands below, for example, will be enough to generate an Emacs
>> container:
>> $ cat emacs.json
>> {
>>    "ref": "fedora-atomic/f22/x86_64/emacs",
>>    "repos": ["fedora-22"],
>>    "container": true,
>>    "packages": ["emacs"]
>> }
>> $ sudo rpm-ostree --repo=repo compose tree emacs.json
>> $ sudo ostree-docker-builder --repo=repo -c emacs fedora-atomic/f22/x86_64/emacs --entrypoint=/usr/bin/emacs-24.5
>> ostree-docker-builder also supports pushing the image to the registry if
>> something has changed (thanks to Colin for suggesting this!), it uses a
>> Docker LABEL to remember the OStree commit used to generate to image.
>> The two advantages of using it are:
>> - The same tool to generate the OS image and the containers.
>> - Use OStree to track what files were changed, added or removed.  If there are no differences then no image is created.
>> Any comments?
>> Thanks,
>> Giuseppe

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