Add configurable baseURL (required for multi-device support)

main.go

@@ -39,13 +39,18 @@ const (
 	cacheFile         = "public/romcache.json" // persistence between server restarts so we don't have to rehash all the ROM files each time the program starts
 )
 
-var ( // evil global variable
+var ( // evil global variables
 	romCache ROMCache
+	baseURL  string
 )
 
 func init() {
 	// intialize and load ROMCache from file - so we don't have to rehash all the big files again
 	romCache = ROMCache{}
+	baseURL = os.Getenv("baseurl")
+	if len(baseURL) < 1 {
+		log.Fatalf("required environment variable 'baseurl' is not set.")
+	}
 
 	romCacheJson, err := os.ReadFile(cacheFile)
 	if err != nil {
@@ -140,7 +145,7 @@ func updateROMCache() {
 				ID:       fileHash,
 				Romtype:  splitName[3], // UNOFFICIAL
 				Size:     int(fInfo.Size()),
-				URL:      fmt.Sprintf("https://lineageos-ota.deadbeef.codes/public/%s", v.Name()),
+				URL:      fmt.Sprintf("%s/public/%s", baseURL, v.Name()),
 				Version:  splitName[1],
 			}