prometheus/scripts/compress_assets.sh

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#!/usr/bin/env bash
#
# compress static assets
set -euo pipefail
export STATIC_DIR=static
PREBUILT_ASSETS_STATIC_DIR=${PREBUILT_ASSETS_STATIC_DIR:-}
if [ -n "$PREBUILT_ASSETS_STATIC_DIR" ]; then
STATIC_DIR=$(realpath $PREBUILT_ASSETS_STATIC_DIR)
fi
cd web/ui
cp embed.go.tmpl embed.go
GZIP_OPTS="-fk"
# gzip option '-k' may not always exist in the latest gzip available on different distros.
if ! gzip -k -h &>/dev/null; then GZIP_OPTS="-f"; fi
mkdir -p static
find static -type f -name '*.gz' -delete
# Compress files from the prebuilt static directory and replicate the structure in the current static directory
find "${STATIC_DIR}" -type f ! -name '*.gz' -exec bash -c '
for file; do
dest="${file#${STATIC_DIR}}"
mkdir -p "static/$(dirname "$dest")"
gzip '"$GZIP_OPTS"' "$file" -c > "static/${dest}.gz"
done
' bash {} +
# Append the paths of gzipped files to embed.go
find static -type f -name '*.gz' -print0 | sort -z | xargs -0 echo //go:embed >> embed.go
echo var EmbedFS embed.FS >> embed.go