cmd/sharefs: check option parsing behaviour

This change makes it possible to check parseOpts behaviour as part of Go tests.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/sharefs/main.go

@@ -3,23 +3,14 @@ package main
 import (
 	"log"
 	"os"
-	"path"
 )
 
-// executableName is the [path.Base] name of the executable that started the current process.
-var executableName = func() string {
-	if len(os.Args) > 0 {
-		return path.Base(os.Args[0])
-	} else if name, err := os.Executable(); err != nil {
-		return "sharefs"
-	} else {
-		return path.Base(name)
-	}
-}()
+// sharefsName is the prefix used by log.std in the sharefs process.
+const sharefsName = "sharefs"
 
 func main() {
 	log.SetFlags(0)
-	log.SetPrefix(executableName + ": ")
+	log.SetPrefix(sharefsName + ": ")
 
-	os.Exit(_main(len(os.Args), copyStrings(os.Args...)))
+	os.Exit(_main(os.Args...))
 }