Consul built-in assets missing font files

[slackpad]

If you do a wget -r against the internal UI there are some missing assets:

--2016-11-08 14:54:37--  http://localhost:8500/ui/fonts/glyphicons-halflings-regular.eot
Reusing existing connection to localhost:8500.
HTTP request sent, awaiting response... 500 Internal Server Error
2016-11-08 14:54:37 ERROR 500: Internal Server Error.

--2016-11-08 14:54:37--  http://localhost:8500/ui/fonts/glyphicons-halflings-regular.eot?
Reusing existing connection to localhost:8500.
HTTP request sent, awaiting response... 500 Internal Server Error
2016-11-08 14:54:37 ERROR 500: Internal Server Error.

--2016-11-08 14:54:37--  http://localhost:8500/ui/fonts/glyphicons-halflings-regular.woff
Reusing existing connection to localhost:8500.
HTTP request sent, awaiting response... 500 Internal Server Error
2016-11-08 14:54:37 ERROR 500: Internal Server Error.

--2016-11-08 14:54:37--  http://localhost:8500/ui/fonts/glyphicons-halflings-regular.ttf
Reusing existing connection to localhost:8500.
HTTP request sent, awaiting response... 500 Internal Server Error
2016-11-08 14:54:37 ERROR 500: Internal Server Error.

--2016-11-08 14:54:37--  http://localhost:8500/ui/fonts/glyphicons-halflings-regular.svg
Reusing existing connection to localhost:8500.
HTTP request sent, awaiting response... 500 Internal Server Error
2016-11-08 14:54:37 ERROR 500: Internal Server Error.

We should fix this and add a check to the ui build to catch these.

[brianshumate]

I took a look at this because I'd like to fix it, but it looks like GLYPHICONS Halflings icons / icon font are licensed in a manner that is incompatible with open source projects.

From the You must not list:

include icons in open-source projects, since this license is not compatible with most of the open-source licenses

[slackpad]

Hmm - let's audit to see where we use them. Maybe we can get rid of them completely as a way forward.

[brianshumate]

Sounds good! I would also be happy to find a more open source friendly alternative and implement them as well.

[brianshumate]

They're apparently included under a special provision with Bootstrap:

Glyphicons Halflings are normally not available for free, but their creator has made them available for Bootstrap free of cost. As a thank you, we only ask that you include a link back to Glyphicons whenever possible.

They are referenced in our minified Bootstrap CSS in ui/static/bootstrap.min.css, but it does not appear that we actually use them:

pwd
/Users/brian/src/hashicorp/consul
grep -r --exclude="bootstrap*" glyphicon .

We could remove the @font-face entries from the static minified bootstrap.min.css for an instant resolution of this issue, but to avoid this going forward, we'd have to customize Bootstrap further and deselect the Glyphicons component.

[slackpad]

Trimming our bootstrap build sounds like the way to go.