opts: Reject duplicate shorthand GPU counts

`--gpus count=1,2` and `--gpus 1,2` silently replace the first count, while `--gpus 1,count=2` correctly reports a duplicate.

Normalize shorthand counts to the `count` key before checking duplicates. Tests cover both orders, multiple shorthand values, and `all`; rejected options do not append a device request.

Signed-off-by: Alexandre Rodrigues <alexandre3ylf@gmail.com>

opts/gpus.go

@@ -33,8 +33,6 @@ func parseCount(s string) (int, error) {
 }
 
 // Set a new mount value
-//
-//nolint:gocyclo
 func (o *GpuOpts) Set(value string) error {
 	csvReader := csv.NewReader(strings.NewReader(value))
 	fields, err := csvReader.Read()
@@ -48,20 +46,14 @@ func (o *GpuOpts) Set(value string) error {
 	// Set writable as the default
 	for _, field := range fields {
 		key, val, withValue := strings.Cut(field, "=")
+		if !withValue {
+			key, val = "count", key
+		}
 		if _, ok := seen[key]; ok {
 			return fmt.Errorf("gpu request key '%s' can be specified only once", key)
 		}
 		seen[key] = struct{}{}
 
-		if !withValue {
-			seen["count"] = struct{}{}
-			req.Count, err = parseCount(key)
-			if err != nil {
-				return err
-			}
-			continue
-		}
-
 		switch key {
 		case "driver":
 			req.Driver = val

opts/gpus_test.go

@@ -52,3 +52,13 @@ func TestGpusOpts(t *testing.T) {
 		}))
 	}
 }
+
+func TestGpusOptDuplicateCount(t *testing.T) {
+	for _, value := range []string{"count=1,2", "1,2", "all,1", "count=1,all", "1,count=2", "count=1,count=2"} {
+		t.Run(value, func(t *testing.T) {
+			var gpus GpuOpts
+			assert.Error(t, gpus.Set(value), "gpu request key 'count' can be specified only once")
+			assert.Assert(t, is.Len(gpus.Value(), 0))
+		})
+	}
+}