#!/bin/sh

root="$PWD/image/overlay"
env_file="${1:-.env}"

if [ ! -f "$env_file" ]; then
    echo "cannot find $env_file"
    exit 1
fi

current_file=""

fail=0

while IFS= read -r line; do
    case "$line" in
        \#\ /*)
            current_file="${line#\# }"

            target="$root$current_file"

            if [ ! -f "$target" ]; then
                echo "missing file: $target" >&2
                fail=1
                current_file=""
            fi
            ;;
        \#\:*)
            continue
            ;;
        *=*)
            if [ -z "$current_file" ]; then
                echo "warning: value without file: $line" >&2
                continue
            fi

            key="${line%%=*}"

            target="$root$current_file"

            if ! grep -q "_${key}_" "$target"; then
                echo "missing variable: _${key}_ in $target" >&2
                fail=1
            fi
            ;;

        "")
            continue
            ;;

        *)
            echo "unknown line: $line" >&2
            fail=1
            ;;
    esac
done < "$env_file"

exit "$fail"