[users at bb.net] Customizing the user interface

[Josh Bialkowski]

I would like to do some minor customization of the buildbot web user
interface. In particular, I'd like to add a navigation menu linking to
other related services (i.e. gerrit, etc). I'm having trouble figuring out
where to start. I haven't found any "simple" ways of hooking some extra
elements into the UI, so I tried to follow
http://docs.buildbot.net/latest/developer/www-base-app.html#hacking-quick-start
...but I can't seem to follow the instructions. In particular, the `make
frontend` step fails (error text below). I also tried running `gulp dev`
from `www/base` and got a simliar error.

Does anyone have any info about how to get past this? Alternatively, if
there are any recommendations how to add a simple bit of code to web UI I'd
appreciate it.

`make frontend`
---------------------
Obtaining file:///home/josh/codes/buildbot/www/base
    Complete output from command python setup.py egg_info:
    running egg_info
    running build_js
    /bin/sh: 1: yarn: not found
    yarn:  npm:  6.8.0
    Running command: npm install
    npm WARN buildbot-www@ No description
    npm WARN buildbot-www@ No repository field.
    npm WARN buildbot-www@ No license field.
    npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents at 1.1.3
(node_modules/fsevents):
    npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for
fsevents at 1.1.3: wanted {"os":"darwin","arch":"any"} (current:
{"os":"linux","arch":"x64"})

    audited 1895 packages in 2.589s
    found 61 vulnerabilities (22 low, 25 moderate, 14 high)
      run `npm audit fix` to fix them, or `npm audit` for details
    Running command:
/home/josh/codes/buildbot/www/base/node_modules/.bin/gulp prod --notests
    gulp[13457]: ../src/node_contextify.cc:633:static void
node::contextify::ContextifyScript::New(const
v8::FunctionCallbackInfo<v8::Value>&): Assertion `args[1]->IsString()'
failed.
     1: 0x8dc1c0 node::Abort() [gulp]
     2: 0x8dc295  [gulp]
     3: 0x90ff57
node::contextify::ContextifyScript::New(v8::FunctionCallbackInfo<v8::Value>
const&) [gulp]
     4: 0xb5d3fb  [gulp]
     5: 0xb5f392 v8::internal::Builtin_HandleApiCall(int,
v8::internal::Object**, v8::internal::Isolate*) [gulp]
     6: 0x28d96675be1d

/home/josh/codes/buildbot/.venv/lib/python3.5/site-packages/setuptools/dist.py:475:
UserWarning: Normalizing '2.0.2-dev101' to '2.0.2.dev101'
      normalized_version,
    error: cannot copy tree 'buildbot_www/static': not a directory

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in
/home/josh/codes/buildbot/www/base/


`gulp dev`
-------------
gulp dev[13530]: ../src/node_contextify.cc:633:static void
node::contextify::ContextifyScript::New(const
v8::FunctionCallbackInfo<v8::Value>&): Assertion `args[1]->IsString()'
failed.
 1: 0x8dc1c0 node::Abort() [gulp dev]
 2: 0x8dc295  [gulp dev]
 3: 0x90ff57
node::contextify::ContextifyScript::New(v8::FunctionCallbackInfo<v8::Value>
const&) [gulp dev]
 4: 0xb5d3fb  [gulp dev]
 5: 0xb5f392 v8::internal::Builtin_HandleApiCall(int,
v8::internal::Object**, v8::internal::Isolate*) [gulp dev]
 6: 0x3b2e22dbe1d
Aborted (core dumped)
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