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esphome/docker/docker_entrypoint.sh

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#!/bin/bash
# If /cache is mounted, use that as PIO's coredir
# otherwise use path in /config (so that PIO packages aren't downloaded on each compile)
if [[ -d /cache ]]; then
pio_cache_base=/cache/platformio
else
pio_cache_base=/config/.esphome/platformio
fi
if [[ ! -d "${pio_cache_base}" ]]; then
echo "Creating cache directory ${pio_cache_base}"
echo "You can change this behavior by mounting a directory to the container's /cache directory."
mkdir -p "${pio_cache_base}"
fi
# we can't set core_dir, because the settings file is stored in `core_dir/appstate.json`
# setting `core_dir` would therefore prevent pio from accessing
export PLATFORMIO_PLATFORMS_DIR="${pio_cache_base}/platforms"
export PLATFORMIO_PACKAGES_DIR="${pio_cache_base}/packages"
export PLATFORMIO_CACHE_DIR="${pio_cache_base}/cache"
exec esphome "$@"