chore(gonf): fix errcheck and shadow errors

2 files changed, 17 insertions, 9 deletions

diff --git a/cmd/gonf/cmd_build.go b/cmd/gonf/cmd_build.go
index ebcde29..6a59b4b 100644
--- a/cmd/gonf/cmd_build.go
+++ b/cmd/gonf/cmd_build.go
@@ -19,7 +19,7 @@ func cmdBuild(ctx context.Context,
 where FLAG can be one or more of`, flag.ContinueOnError)
 	hostFlag := addHostFlag(f)
 	f.SetOutput(stderr)
-	f.Parse(args)
+	_ = f.Parse(args)
 	if helpMode {
 		f.SetOutput(stdout)
 		f.Usage()
@@ -32,17 +32,23 @@ where FLAG can be one or more of`, flag.ContinueOnError)
 	return runBuild(ctx, stderr, hostDir)
 }
 
-func runBuild(ctx context.Context, stderr io.Writer, hostDir string) error {
+func runBuild(ctx context.Context, stderr io.Writer, hostDir string) (err error) {
 	wd, err := os.Getwd()
 	if err != nil {
 		return err
 	}
-	defer os.Chdir(wd)
-	os.Chdir(hostDir)
+	defer func() {
+		if e := os.Chdir(wd); err == nil {
+			err = e
+		}
+	}()
+	if err = os.Chdir(hostDir); err != nil {
+		return err
+	}
 	cmd := exec.CommandContext(ctx, "go", "build", "-ldflags", "-s -w -extldflags \"-static\"", hostDir)
 	cmd.Env = append(cmd.Environ(), "CGO_ENABLED=0")
 	if out, err := cmd.CombinedOutput(); err != nil {
-		fmt.Fprint(stderr, string(out))
+		_, _ = fmt.Fprint(stderr, string(out))
 		return err
 	}
 	return nil
diff --git a/cmd/gonf/main.go b/cmd/gonf/main.go
index 8dae51d..fe6f065 100644
--- a/cmd/gonf/main.go
+++ b/cmd/gonf/main.go
@@ -49,11 +49,13 @@ where FLAG can be one or more of`, flag.ContinueOnError)
 	f.BoolVar(&helpMode, "help", false, "show contextual help")
 	f.StringVar(&configDir, "config", "", "(REQUIRED for most commands) path to a gonf configurations repository (overrides the GONF_CONFIG environment variable)")
 	f.SetOutput(stderr)
-	f.Parse(args[1:])
+	if err := f.Parse(args[1:]); err != nil {
+		return err
+	}
 
 	if f.NArg() < 1 {
 		f.Usage()
-		return errors.New("No command given")
+		return errors.New("no command given")
 	}
 	cmd := f.Arg(0)
 	argsTail := f.Args()[1:]
@@ -68,7 +70,7 @@ where FLAG can be one or more of`, flag.ContinueOnError)
 			configDir = getenv("GONF_CONFIG")
 			if configDir == "" {
 				f.Usage()
-				return errors.New("The GONF_CONFIG environment variable is unset and the -config FLAG is missing. Please use one or the other.")
+				return errors.New("the GONF_CONFIG environment variable is unset and the -config FLAG is missing. Please use one or the other")
 			}
 		}
 		switch cmd {
@@ -76,7 +78,7 @@ where FLAG can be one or more of`, flag.ContinueOnError)
 			return cmdBuild(ctx, f, argsTail, getenv, stdout, stderr)
 		default:
 			f.Usage()
-			return fmt.Errorf("Invalid command: %s", cmd)
+			return fmt.Errorf("invalid command: %s", cmd)
 		}
 	}
 	return nil