Introduces version string in log message

Adds a version string to enable the user to distinguish between
multiple Prosody-Filer versions. The version information is "baked in"
via the linker in build.sh

build.sh

@@ -1,7 +1,10 @@
-#!/bin/sh
+#!/bin/bash
 
-##
-## Builds static prosody-filer binary
-##
+### get VERSIONSTRING
+VERSIONSTRING="$(git describe --tags --exact-match || git rev-parse --short HEAD)"
+
+echo "Building version ${VERSIONSTRING} of Prosody-Filer ..."
+
+### Compile and link statically
+CGO_ENABLED=0 GOOS=linux go build -a -ldflags "-extldflags '-static' -w -s -X main.versionString=${VERSIONSTRING}" prosody-filer.go
 
-CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' .

main.go → prosody-filer.go

@@ -36,6 +36,7 @@ type Config struct {
 }
 
 var conf Config
+var versionString string = "0.0.0"
 
 /*
  * Sets CORS headers
@@ -192,7 +193,7 @@ func main() {
 	/*
 	 * Start HTTP server
 	 */
-	log.Println("Starting up XMPP HTTP upload server ...")
+	log.Println("Starting Prosody-Filer", versionString, "...")
 	http.HandleFunc("/"+conf.UploadSubDir, handleRequest)
 	log.Printf("Server started on port %s. Waiting for requests.\n", conf.Listenport)
 	http.ListenAndServe(conf.Listenport, nil)