fix: return empty arrays instead of null in listPartitions, listVolumes, handleDiskVolumes

extract.go

@@ -82,7 +82,7 @@ func listPartitions(isoPath string) ([]string, error) {
 	}
 
 	re := regexp.MustCompile(`^\s+([A-Z])\s+`)
-	var parts []string
+	parts := []string{}
 	for _, line := range strings.Split(out, "\n") {
 		if m := re.FindStringSubmatch(line); m != nil {
 			parts = append(parts, m[1])
@@ -110,7 +110,7 @@ func listVolumes(isoPath string, partitions []string) ([]volInfo, error) {
 	rePrompt := regexp.MustCompile(`/disk0/([A-Z])\s*>`)
 	reEntry := regexp.MustCompile(`^\s+\d+\s+(.+?)\s+-\s+`)
 
-	var vols []volInfo
+	vols := []volInfo{}
 	currentPart := ""
 
 	for _, line := range strings.Split(out, "\n") {

serve.go

@@ -334,7 +334,7 @@ func handleDiskVolumes(w http.ResponseWriter, r *http.Request) {
 		writeJSON(w, map[string]any{"error": err.Error()})
 		return
 	}
-	var filtered []volInfo
+	filtered := []volInfo{}
 	for _, v := range vols {
 		if v.Part == part {
 			filtered = append(filtered, v)