Created
October 23, 2025 17:13
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Bash script to security load a simple config file
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| load_config() { | |
| local config_file="$1" | |
| # Check if the file exists and is readable | |
| if [[ ! -r "$config_file" ]]; then | |
| echo "Error: Configuration file $config_file not found or unreadable." >&2 | |
| return 1 | |
| fi | |
| # NOTE: This function only reads simple KEY=value pairs. | |
| # It does not support shell arrays (KEY=(v1 v2)) or associative arrays (hashes). | |
| while IFS= read -r line; do | |
| # Clean up leading/trailing whitespace on the whole line | |
| line="${line#"${line%%[![:space:]]*}"}" | |
| line="${line%"${line##*[![:space:]]*}"}" | |
| # Skip empty lines or lines starting with '#' (comments) | |
| if [[ -z "$line" || "$line" =~ ^# ]]; then | |
| continue | |
| fi | |
| # Split key and value on the first '=' occurrence | |
| key="${line%%=*}" | |
| value="${line#*=}" | |
| # Clean up whitespace on the key and value | |
| key="${key#"${key%%[![:space:]]*}"}" | |
| value="${value#"${value%%[![:space:]]*}"}" | |
| # Verify the key is a valid Bash variable name | |
| if ! [[ "$key" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]]; then | |
| echo "Warning: Invalid variable name '$key'. Skipping." >&2 | |
| continue | |
| fi | |
| # Safely quote the value to prevent command injection | |
| local safe_value | |
| printf -v safe_value '%q' "$value" | |
| # Assign the variable in the calling script's scope | |
| eval "$key=$safe_value" | |
| done < "$config_file" | |
| } |
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