Buck RN JS bundle generation

BUCK

# workaround to make rule key to depend on node and npm versions
NODE_NPM_VERSIONS = 'cat $(location //:node_version) && cat $(location //:npm_version) && '

# prepopulated modules
# for example CI fails to clone react-native-permissions fork due to ssh permissions
export_file(
  name = 'locale_node_modules',
  src = 'node_modules',
  out = 'node_modules',
)

genrule(
  name = 'node_modules',
  visibility = ['PUBLIC'],
  srcs = [
    '.babelrc',
    '.npmrc',
    '.nvmrc',
    'npm-shrinkwrap.json',
    'package.json',
  ],
  bash = NODE_NPM_VERSIONS + '' \
    'rsync $SRCDIR/ $TMP/ -a --copy-links -v && ' \
    'mkdir -p $TMP/node_modules/ && ' \
    'rsync $(location :locale_node_modules)/ $TMP/node_modules/ -a --copy-links -v && ' \
    'cd $TMP && npm install && ' \
    'mv $TMP/node_modules $OUT && ' \
    'rm -rf $TMP',
  out = 'node_modules',
)

PLATFORMS = [
  'ios',
  # TODO(fedor): add android
]

for platform in PLATFORMS:
  genrule(
    name = 'bundle-' + platform,
    visibility = ['PUBLIC'],
    srcs = [
      '.babelrc',
      '.flowconfig',
    ] + glob([
      '**/*.ejs',
      '**/*.gif',
      '**/*.js',
      '**/*.json',
      '**/*.jpg',
      '**/*.png',
      '**/*.sh',
    ], excludes = [
      'node_modules/**'
    ]),
    bash = NODE_NPM_VERSIONS + '' \
      'mkdir -p $OUT && ' \
      'rsync $SRCDIR/ $TMP/ -a --copy-links -v && ' \
      'cp -r $(location :node_modules) $TMP && ' \
      'cd $TMP && ' \
      'node ./node_modules/react-native/local-cli/cli.js bundle ' \
        '--platform ' + platform + ' ' \
        '--dev false ' \
        '--entry-file index.js ' \
        '--bundle-output $OUT/main.jsbundle ' \
        '--assets-dest $OUT && ' \
      'rm -rf $TMP',
    out = 'Assets',
  )

Here are some root rules for NPM and Node

PROGRAMS = [
  'node',
  'npm',
]

for program in PROGRAMS:
  genrule(
    visibility = ['PUBLIC'],
    name = program + '_version',
    bash = program + ' --version >> $OUT',
    out  = program + '_version.txt'
  )