Expose version or commit SHA of UI

[tiffon]

Purpose is to be able to determine which version of the UI is currently deployed.

If version is used, it needs to not always be 0.0.1.

Thanks to @saminzadeh for suggesting this.

[yurishkuro]

+1. Is there an npm module that can extract the commit during the build?

[tiffon]

It would also be nice for this to show the version of the Jaeger services, not just the UI.

Related jaegertracing/jaeger#145

[tiffon]

@yurishkuro Re npm package, we might be able to use git-repo-version to generate (package-version, SHA, date) strings and jest-changed-files to capture which files, if any, have been modified for the build.

git-repo-version: 1.5.0+a1b2c3d4e5 2016-10-24T18:26:53.000Z

jest-changed-files:

import {getChangedFilesForRoots} from 'jest-changed-files';

getChangedFilesForRoots(['/path/to/test'], {
  lastCommit: true,
  withAncestor: true,
}).then(files => {
  /*
  {
    repos: [],
    changedFiles: []
  }
  */
});

[yurishkuro]

during the build we can easily get the SHAs for both query service and the ui submodule using git commands directly. The UI build could read them from env vars.

[yurishkuro]

Resolved by #606