Removing if checks and optimizing setting up of default OutputFile as DRONE_OUTPUT.

cmd/kaniko-docker/main.go

@@ -353,7 +353,7 @@ func main() {
 			Usage:  "Path to ignore during the build.",
 			EnvVar: "PLUGIN_IGNORE_PATH",
 		},
-		cli.StringFlag{
+		cli.StringSliceFlag{
 			Name:   "ignore-paths",
 			Usage:  "Path to ignore during the build.",
 			EnvVar: "PLUGIN_IGNORE_PATHS",

kaniko.go

@@ -483,14 +483,13 @@ func (p Plugin) Exec() error {
 		}
 	}
 
-	if p.Output.OutputFile != "" {
-		var tarPath string
-		if p.Build.TarPath != "" {
-			tarPath = getTarPath(p.Build.TarPath)
-		}
-		if err = output.WritePluginOutputFile(p.Output.OutputFile, getDigest(p.Build.DigestFile), tarPath); err != nil {
-			fmt.Fprintf(os.Stderr, "failed to write plugin output file at path: %s with error: %s\n", p.Output.OutputFile, err)
-		}
+	p.Output.OutputFile = os.Getenv("DRONE_OUTPUT")
+	var tarPath string
+	if p.Build.TarPath != "" {
+		tarPath = getTarPath(p.Build.TarPath)
+	}
+	if err = output.WritePluginOutputFile(p.Output.OutputFile, getDigest(p.Build.DigestFile), tarPath); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to write plugin output file at path: %s with error: %s\n", p.Output.OutputFile, err)
 	}
 
 	return nil