Add --bind-conf flag for BIND domains.conf generation

Generate a BIND-format domains.conf file alongside catalog zones.
New input properties: file= (zone data path) and dnssec (bare flag).
When --bind-conf is set, every zone must have file= or it errors.

Renames ZoneEntry.File to ZonesFile (input path for error messages)
and adds ZoneFile (BIND file path) and DNSSEC (bool) fields.

main.go

@@ -12,8 +12,9 @@ import (
 func main() {
 	configPath := flag.String("config", "", "path to YAML config (default: catz.yaml next to input file)")
 	outputDir := flag.String("output-dir", "", "directory for output zone files (default: same as input file)")
+	bindConf := flag.String("bind-conf", "", "path to write BIND domains.conf")
 	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, "Usage: catalog-zone-gen [--config path] [--output-dir path] <input-file>\n")
+		fmt.Fprintf(os.Stderr, "Usage: catalog-zone-gen [--config path] [--output-dir path] [--bind-conf path] <input-file>\n")
 		flag.PrintDefaults()
 	}
 	flag.Parse()
@@ -39,7 +40,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	members, err := parseInput(inputFile, cfg)
+	entries, members, err := parseInput(inputFile, cfg)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "error: %s\n", err)
 		os.Exit(1)
@@ -70,6 +71,15 @@ func main() {
 		}
 	}
 
+	if *bindConf != "" {
+		if err := writeBindConf(*bindConf, entries); err != nil {
+			fmt.Fprintf(os.Stderr, "error: %s\n", err)
+			hasErrors = true
+		} else {
+			fmt.Fprintf(os.Stderr, "%s: written\n", *bindConf)
+		}
+	}
+
 	if hasErrors {
 		os.Exit(1)
 	}