meshviewer: replace manual tasks with automation

[FFHener]

Set a fixed version that can be updated with version control. Automate the updating step.

[nicolasberens]

Could you add a check which version is currently deployed so it does not need to download it on every deployment?

[FFHener]

I solved it by storing the downloaded zip in /opt/meshviewer alongside the other files. Ansible wont redownload the file and since its < 2 MB i think its ok to leave it there.

[nicolasberens]

it will still unpack the package every time.

i took a look and it does not seem like meshviewer has an easily readable way to determine the version.

you could e.g. add a file in /var/www/hopglass.berlin.freifunk.net/meshviewer_version with the version number currently deployed and decide based on that if a new version shoud be deployed

[FFHener]

I was thinking about a version number as well, but this felt like a more build in way of handling things. I made the unpacking part a handler so it will only run when something new gets downloaded

[nicolasberens]

But how do you know if you need to download something?

You could add the Version to the downloaded file name.

[FFHener]

The get_url module should handle it fine. If force is false (default) than the module only downloads the file if something changed. I tested the following to confirm it works:

1. 13.0.0 is installed
2. Redo a ansible run => Nothing gets downlaoded or applied
3. Change meshviewer_version: 13.0.0 to meshviewer_version: 12.8.0
4. Redo a ansible run => Old release gets downloaded and apllied
5. Redo a ansible run => Nothing gets downloaded or applied
6. Change meshviewer_version: 12.8.0 to meshviewer_version: 13.0.0
7. Redo a ansible run => New release gets downloaded and applied
8. Redo a ansible run => Nothing gets downloaded or applied

As the release file should change with every release this approach should work. If you still prefer another way just let me now.

[nicolasberens]

Ok, i am confused by anisble:
running it with --check shows 2 changes, but without it says nothing changed ...