Consolidate logic for isolating artifacts

pkg/cmd/run/download/download.go

@@ -151,8 +151,10 @@ func runDownload(opts *DownloadOptions) error {
 	opts.IO.StartProgressIndicator()
 	defer opts.IO.StopProgressIndicator()
 
-	// track downloaded artifacts and avoid re-downloading any of the same name
+	// track downloaded artifacts and avoid re-downloading any of the same name, isolate if multiple artifacts
 	downloaded := set.NewStringSet()
+	isolateArtifacts := isolateArtifacts(wantNames, wantPatterns)
+
 	for _, a := range artifacts {
 		if a.Expired {
 			continue
@@ -165,16 +167,9 @@ func runDownload(opts *DownloadOptions) error {
 				continue
 			}
 		}
-		destDir := opts.DestinationDir
 
-		// Isolate the downloaded artifact file to avoid potential conflicts from other downloaded artifacts when:
-		//
-		// 1. len(wantPatterns) > 0: Any pattern can result in 2+ artifacts
-		// 2. len(wantNames) == 0: User wants all artifacts regardless what they are named
-		// 3. len(wantNames) > 1: User wants multiple, specific artifacts
-		//
-		// Otherwise if a single artifact is wanted, then the protective subdirectory is an unnecessary inconvenience.
-		if len(wantPatterns) > 0 || len(wantNames) != 1 {
+		destDir := opts.DestinationDir
+		if isolateArtifacts {
 			destDir = filepath.Join(destDir, a.Name)
 		}
 
@@ -196,6 +191,25 @@ func runDownload(opts *DownloadOptions) error {
 	return nil
 }
 
+func isolateArtifacts(wantNames []string, wantPatterns []string) bool {
+	if len(wantPatterns) > 0 {
+		// Patterns can match multiple artifacts
+		return true
+	}
+
+	if len(wantNames) == 0 {
+		// All artifacts wanted regardless what they are named
+		return true
+	}
+
+	if len(wantNames) > 1 {
+		// Multiple, specific artifacts wanted
+		return true
+	}
+
+	return false
+}
+
 func matchAnyName(names []string, name string) bool {
 	for _, n := range names {
 		if name == n {