nginx/1.21/20-envsubst-on-templates.sh

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#!/bin/sh
set -e
ME=$(basename $0)
auto_envsubst() {
local template_dir="${NGINX_ENVSUBST_TEMPLATE_DIR:-/etc/nginx/templates}"
local suffix="${NGINX_ENVSUBST_TEMPLATE_SUFFIX:-.template}"
local output_dir="${NGINX_ENVSUBST_OUTPUT_DIR:-/etc/nginx/conf.d}"
local template defined_envs relative_path output_path subdir
defined_envs=$(printf '${%s} ' $(env | cut -d= -f1))
[ -d "$template_dir" ] || return 0
if [ ! -w "$output_dir" ]; then
echo >&3 "$ME: ERROR: $template_dir exists, but $output_dir is not writable"
return 0
fi
find "$template_dir" -follow -type f -name "*$suffix" -print | while read -r template; do
relative_path="${template#$template_dir/}"
output_path="$output_dir/${relative_path%$suffix}"
subdir=$(dirname "$relative_path")
# create a subdirectory where the template file exists
mkdir -p "$output_dir/$subdir"
echo >&3 "$ME: Running envsubst on $template to $output_path"
envsubst "$defined_envs" < "$template" > "$output_path"
done
}
auto_envsubst
exit 0