[atomic-devel] Looking at adding version support to the atomic command.

[Daniel J Walsh <dwalsh redhat com>]

One of the things I would like to return is version information about an
image.  The version content could be stored as LABELS in the dockerfile.

For example if you had


FROM         fedora
MAINTAINER    Dan Walsh
ENV container docker
RUN yum -y update; yum -y install httpd; yum clean all; systemctl enable
httpd

LABEL Name=Apache
LABEL Version=1.0
LABEL Release=1
LABEL Vendor="Red Hat" License=GPLv3
LABEL INSTALL="docker run --rm --privileged -v /:/host -e HOST=/host -e
LOGDIR=${LOGDIR} -e CONFDIR=${CONFDIR} -e DATADIR=${DATADIR} -e
IMAGE=IMAGE -e NAME=NAME IMAGE /bin/install.sh"
LABEL UNINSTALL="docker run --rm --privileged -v /:/host -e HOST=/host
-e IMAGE=IMAGE -e NAME=NAME IMAGE /bin/uninstall.sh"
ADD root /

EXPOSE 80
RUN rm -f /etc/machine-id
LABEL RUN echo '$PWD' '$(id -u)'

CMD [ "/sbin/init" ]

And did a docker build -t test .


Now you could execute

atomic version test, which would print the ID, The Name:Version:Release
as specified in the Image labels. And finally the tag if it exists.

atomic version test
afecc5f6a3c4d8f2326901c94cdf84aab0890ea827c38f2b0d2e2a4ba5ace7d6
Apache:1.0:1 test:latest

Another feature I have added is, the ability to recurse though all of
the layers of the image.

atomic version -r test
afecc5f6a3c4d8f2326901c94cdf84aab0890ea827c38f2b0d2e2a4ba5ace7d6
Apache:1.0:1 test:latest
21b2d6e4171b024cb48bb2d02d626481e37724a6e03dac7962e44cc8612fbf22
Apache:1.0:1
83202d54cf27439381b3d668d02f3a21cb75ebba4623d86e1fdbad614660424e
Apache:1.0:1
90ff7403d883c0ccde72bf630cb77e224fd6b517fc4b61b84f8d9739dab93c9f
Apache:1.0:1
12f19f77bc52483d902727b6c142f20cc79109ad45e36869f30c15228534eb5b
Apache:1.0:1
4bcd0ad4dbe8c39f49094c3f13c8aa517efe6c76de1aacb6fca413ee3372dd98
Apache:1.0:1
fabaf6ef3297a7d6006ee24034aa2ba525f064f108580d4b44944e24b1581513
Apache:1.0:1
eb10dd5ab6a2a649d5e069c67fdd71506db0b0a1e4a5b5680c1d3f317bfa320a
Apache:1.0:1
b0bc3c982c88037a5e7b6e7e6de900981c9f90516014b7071fe860ca39a22d02
Apache:1.0:1
99878fca96575b6ccac2fa54a2f2a44ad85d94344e8fbde5ae2350e3b5eec98b Apache:1.0:
fc8782dfd543be2a582cf8ee7eff4e39c46a980f212891342ac4c6c6917ee211 Apache::
cf6c210ea5b979204df75ad4aeaa3dcb971589c2399d79e6c2a71e7588e95cd9 ::
4dab839254d036da5ad52f459d6602b1a84f379fe94c722bd969db14e119189a ::
011c13014fd9ede3e53119f380e20b88af2e8bd40afb1b3925ed39cbd067e453 ::
834629358fe214f210b0ed606fba2c17827d7a46dd74bd3309afc2a103ad0e89 ::
fedora:21
00a0c78eeb6d81442efcd1d7c02e8b141745e3a06f1ee3458e1bae628e0067d3 ::
511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158 ::

Which looks better on a terminal then in email.

I guess the only question would be what should the output look like. 
The nice feature of this is you would know that the test container is
based on the
fedora:21 package.


Wanted the tool to not only get the Label Version but also the tag if it
exists, and added recursion.