Add --message or --comment switch for an image built by "docker build"

[Konrad Wilhelm]

Hi,

as far as I understand, every Docker image contains a JSON field called "comment".

One can inspect this field by typing "docker inspect IMAGE_NAME".

At first I wondered how one can set this JSON field and found out that it can be set by running "docker commit --message=...".

If I'm not mistaken, this is the only way to set it.

I propose to introduce this "--message" flag for the "docker build" command as well. Then the resulting image that is being build will carry a comment.

Now, I understand that there's the idea to solve this by adding a "DESCRIPTION" command to the Dockerfile (see Pull-Request #6667).

In this commit I quickly sketeched out how I would go about adding a "--message" option to the "docker build" command:

https://github.com/kwk/docker/commit/3277baf5cdd65788614dbaf2ac207a42b5acc65c

Please, let me know what you think.

Are there any other ways or plans to add some descriptive text to an image?

Thank you!

[James Mills]

+1 I like it. I could do things like:

$ docker build -t foo/bar:1.0 -m "initial build" .

cheers

James

James Mills / prologic

E: prol...@shortcircuit.net.au

W: prologic.shortcircuit.net.au

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[Daniel Walsh]

I have a pull request to add a COMMENT command to the docker build as well as docker import -m MESSAGE.

https://github.com/docker/docker/pull/6900

[Mike Day]

On Tuesday, September 23, 2014 10:44:21 AM UTC-4, Konrad Wilhelm wrote:

I propose to introduce this "--message" flag for the "docker build" command as well. Then the resulting image that is being build will carry a comment.

Now, I understand that there's the idea to solve this by adding a "DESCRIPTION" command to the Dockerfile (see Pull-Request #6667).

Would description also be able to serve as a platform tag (Power, x86, aarch64) for the image?

Mike Day