140 lines
4.2 KiB
Bash
Executable file
140 lines
4.2 KiB
Bash
Executable file
#!/bin/bash
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set -euo pipefail
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ENV_FILE="${3:-.env}"
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trim() {
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local value="$1"
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value="${value#"${value%%[![:space:]]*}"}"
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value="${value%"${value##*[![:space:]]}"}"
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printf '%s' "$value"
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}
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# 1. Validation: Check arguments
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if [[ $# -lt 2 || $# -gt 3 ]]; then
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echo "Usage: $0 <source_template_file> <output_destination_file> [env_file]"
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echo "Example: $0 config_template.cfg config.cfg .env"
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exit 1
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fi
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SOURCE_FILE="$1"
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OUTPUT_FILE="$2"
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if [[ ! -f "$SOURCE_FILE" ]]; then
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echo "Error: Source file '$SOURCE_FILE' not found."
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exit 1
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fi
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if [[ "$SOURCE_FILE" == "$OUTPUT_FILE" ]]; then
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echo "Error: Source and output files must be different."
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exit 1
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fi
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# 2. Load .env safely
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if [[ -f "$ENV_FILE" ]]; then
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while IFS= read -r raw_line || [[ -n "$raw_line" ]]; do
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line="${raw_line%$'\r'}"
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line="$(trim "$line")"
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# Skip comments and empty lines
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[[ -z "$line" || "$line" == \#* ]] && continue
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if [[ "$line" != *"="* ]]; then
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echo "Warning: Skipping invalid line in $ENV_FILE: $line"
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continue
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fi
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key="$(trim "${line%%=*}")"
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value="$(trim "${line#*=}")"
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key="${key#export }"
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key="$(trim "$key")"
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if [[ ! "$key" =~ ^[A-Za-z_][A-Za-z0-9_]*$ ]]; then
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echo "Warning: Skipping invalid variable name '$key' in $ENV_FILE"
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continue
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fi
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# Handle quoted values and optional inline comments.
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if [[ "$value" =~ ^\"(.*)\"[[:space:]]*(#.*)?$ ]]; then
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value="${BASH_REMATCH[1]}"
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value="${value//\\\"/\"}"
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value="${value//\\\\/\\}"
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elif [[ "$value" =~ ^\'(.*)\'[[:space:]]*(#.*)?$ ]]; then
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value="${BASH_REMATCH[1]}"
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else
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if [[ "$value" =~ ^(.*[^[:space:]])[[:space:]]+#.*$ ]]; then
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value="${BASH_REMATCH[1]}"
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fi
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value="$(trim "$value")"
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fi
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export "$key=$value"
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done <"$ENV_FILE"
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else
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echo "Notice: $ENV_FILE not found; using system environment variables only."
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fi
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# 3. Process the template (handles {{VAR}} and {{VAR:-default}})
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render_template() {
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local source="$1"
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local target="$2"
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local line full key default replacement has_default rest rendered before
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: >"$target"
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while IFS= read -r line || [[ -n "$line" ]]; do
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# In YAML templates, ignore full-line comments so commented placeholders
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# do not require env values.
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if [[ "$source" =~ \.ya?ml$ && "$line" =~ ^[[:space:]]*# ]]; then
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printf '%s\n' "$line" >>"$target"
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continue
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fi
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rest="$line"
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rendered=""
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while [[ "$rest" =~ \{\{([A-Za-z_][A-Za-z0-9_]*)(:-([^}]*))?\}\} ]]; do
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full="${BASH_REMATCH[0]}"
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key="${BASH_REMATCH[1]}"
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has_default="${BASH_REMATCH[2]-}"
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default="${BASH_REMATCH[3]-}"
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if [[ "${!key+x}" == "x" ]]; then
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replacement="${!key}"
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elif [[ -n "$has_default" ]]; then
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replacement="$default"
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else
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replacement="$full"
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fi
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before="${rest%%"$full"*}"
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rendered+="$before$replacement"
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rest="${rest#*"$full"}"
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done
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line="$rendered$rest"
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printf '%s\n' "$line" >>"$target"
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done <"$source"
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}
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TMP_OUTPUT="$(mktemp)"
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trap 'rm -f "$TMP_OUTPUT"' EXIT
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render_template "$SOURCE_FILE" "$TMP_OUTPUT"
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mv "$TMP_OUTPUT" "$OUTPUT_FILE"
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trap - EXIT
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# 4. Final validation: check for unreplaced placeholders
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if [[ "$SOURCE_FILE" =~ \.ya?ml$ ]]; then
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MISSING_VARS="$(awk '!/^[[:space:]]*#/' "$OUTPUT_FILE" | grep -oE '\{\{[A-Za-z_][A-Za-z0-9_]*(:-[^}]*)?\}\}' | sort -u || true)"
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else
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MISSING_VARS="$(grep -oE '\{\{[A-Za-z_][A-Za-z0-9_]*(:-[^}]*)?\}\}' "$OUTPUT_FILE" | sort -u || true)"
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fi
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if [[ -n "$MISSING_VARS" ]]; then
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echo "--------------------------------------------------------"
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echo "WARNING: The following placeholders were not replaced:"
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echo "$MISSING_VARS"
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echo "Check if these are defined in $ENV_FILE or have defaults."
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echo "--------------------------------------------------------"
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else
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echo "Success: All variables substituted in $OUTPUT_FILE"
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fi
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