add fully aio systemd unit file and script

[sallyom]

Signed-off-by: Sally O'Malley somalley@redhat.com
Signed-off-by: Parul Singh parsingh@redhat.com

Which issue(s) this PR addresses:
This PR partially resolves #276

This PR:
Adds a systemd unit file to run microshift all-in-one with podman
The service:

• creates microshift-vol podman volume if it does not exist
• starts microshift via podman run command
• writes location of KUBECONFIG to /etc/microshift-aio/microshift-aio.conf for easy source /etc/microshift-aio/microshift-aio.conf upon service startup
• included the auto-update podman annotation, but this needs testing to be sure it works correctly (ie, not sure which tags, if it changes the tags)

• With systemctl stop microshift-aoi
  • microshift pod is stopped/deleted
  • microshift-vol is not deleted

[rootfs]

what is this for?

[sallyom]

I wanted a file with the location of the KUBECONFIG like so:

cat <<EOF > /etc/microshift-aio/microshift-aio.conf
export KUBECONFIG=$(/usr/bin/podman volume inspect microshift-vol --format "{{.Mountpoint}}")/microshift/resources/kubeadmin/kubeconfig
EOF

I could not see a better way of getting that path from the service, but that is definitely extra and does not need to be included in the service. I figured it saves users from having to look up the path.

[sallyom]

I also could not figure out how to run ExecStartPost=source /etc/microshift-aio/microshift-aio.conf
I tried ExecStartPost=source, ExecStartPost=/bin/bash source etc, nothing worked but there is def something that does, I gave up and pushed the commit but will keep looking

[sallyom]

@husky-parul if you find something that works or if we decide it's not necessary, you can remove it, feel free to squash/amend, too

[rootfs]

i see, that makes sense

[rootfs]

this probably doesn't need, since the container starts with --rm

[rootfs]

/lgtm

[openshift-ci]

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