build: Explicitly generate _version.py before building frontend

kolibri-tools needs to be able to load the `kolibri_explore_plugin`
Python module at build time, as part of building the frontend. If the
`_version.py` for it has not been generated by then, this will fail.

Manually invoke `setuptools_scm` to generate `_version.py`. This
requires having `setuptools_scm` installed first.

Signed-off-by: Philip Withnall <[email protected]>

#647

Pipfile

@@ -8,6 +8,7 @@ flake8 = "==3.8.3"
 pre-commit = "==2.15.0"
 twine = "*"
 bumpversion = "*"
+setuptools_scm = "*"
 
 [packages]
 nodeenv = "==1.3.3"

package.json

@@ -3,12 +3,13 @@
  "description": "Monorepo with kolibri's Discovery page and custom channel presentations.",
  "private": true,
  "scripts": {
- "build": "yarn build:packages && yarn deploy:welcome && yarn build:plugin && yarn build:info",
+ "build": "yarn build:version && yarn build:packages && yarn deploy:welcome && yarn build:plugin && yarn build:info",
  "build:plugin": "./scripts/set_override.py default && kolibri-tools build prod --plugins kolibri_explore_plugin",
  "build:packages": "yarn build:libs",
  "build:libs": "lerna run build --ignore template-ui",
  "build:apps": "lerna run build --scope template-ui",
  "build:info": "./scripts/build_info.sh > kolibri_explore_plugin/static/build-info.json",
+ "build:version": "python -m setuptools_scm",
  "build-dist": "./scripts/clean.sh && yarn clean && yarn build && python -m build",
  "deploy:apps": "./scripts/bundle_bundles.py",
  "clean": "kolibri-tools build clean --plugins kolibri_explore_plugin",