esphome/docker/rootfs/etc/cont-init.d/30-esphome.sh

#!/usr/bin/with-contenv bashio
# ==============================================================================
# Community Hass.io Add-ons: ESPHome
# This files installs the user ESPHome version if specified
# ==============================================================================

declare esphome_version

if bashio::config.has_value 'esphome_version'; then
    esphome_version=$(bashio::config 'esphome_version')
    if [[ $esphome_version == *":"* ]]; then
      IFS=':' read -r -a array <<< "$esphome_version"
      username=${array[0]}
      ref=${array[1]}
    else
      username="esphome"
      ref=$esphome_version
    fi
    full_url="https://github.com/${username}/esphome/archive/${ref}.zip"
    bashio::log.info "Installing esphome version '${esphome_version}' (${full_url})..."
    pip3 install -U --no-cache-dir "${full_url}" \
      || bashio::exit.nok "Failed installing esphome pinned version."
fi