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#!/bin/sh
set -e
# We can use simple version of envsubst execution as
# envsubst < /usr/share/nginx/html/index.html.template > /usr/share/nginx/html/index.html
# but it replaces everything that looks like environment variable substitution
# so it affects `default values` approach.
# we need to replace only provided environment variables.
auto_envsubst() {
template_path="/usr/share/nginx/html/index.html.template"
output_path="/usr/share/nginx/html/index.html"
defined_envs=$(printf '${%s} ' $(env | cut -d= -f1))
envsubst "$defined_envs" < "$template_path" > "$output_path"
}
auto_envsubst
exit 0
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