docker-magento/compose/bin/setup-grunt

#!/bin/bash
DEFAULT_THEME_ID="select value from core_config_data where path = 'design/theme/theme_id'"
THEME_PATH="select theme_path from theme where theme_id in ($DEFAULT_THEME_ID);"
VENDOR_THEME=$(bin/n98-magerun2 db:query "$THEME_PATH" | sed -n 2p | cut -d$'\r' -f1)
THEME=$(echo "$VENDOR_THEME" | cut -d'/' -f2)
LOCALE_CODE=$(bin/magento config:show general/locale/code | cut -d$'\r' -f1 | sed 's/ *$//g')

# Generate local-theme.js for custom theme
read -r -d '' GEN_THEME_JS << EOM
var fs = require('fs');
var util = require('util');
var theme = require('./dev/tools/grunt/configs/themes');

theme['$THEME'] = {
    area: 'frontend',
    name: '$VENDOR_THEME',
    locale: '$LOCALE_CODE',
    files: [
        'css/styles-m',
        'css/styles-l'
    ],
    dsl: 'less'
};
fs.writeFileSync('./dev/tools/grunt/configs/local-themes.js', '"use strict"; module.exports = ' + util.inspect(theme), 'utf-8');
EOM

if [ -z "$VENDOR_THEME" ] || [ -z "$THEME" ]; then
    echo "Using Magento/luma theme for grunt config"
    THEME=luma
    bin/clinotty cp ./dev/tools/grunt/configs/themes.js ./dev/tools/grunt/configs/local-themes.js
else
    echo "Using $VENDOR_THEME theme for grunt config"
    bin/node -e "$GEN_THEME_JS"
fi

bin/clinotty cp package.json.sample package.json
bin/clinotty cp Gruntfile.js.sample Gruntfile.js
bin/clinotty cp grunt-config.json.sample grunt-config.json
bin/npm install ajv@^5.0.0 --save
bin/npm install
bin/magento cache:clean
bin/grunt clean
bin/grunt exec:$THEME
bin/grunt less:$THEME