*: fix errcheck warnings

internal/exec/stages/disks/luks.go

@@ -110,7 +110,9 @@ func (s *stage) createLuks(config types.Config) error {
 		var ignitionCreatedKeyFile bool
 		// create keyfile inside of tmpfs, it will be copied to the
 		// sysroot by the files stage
-		os.MkdirAll(distro.LuksInitramfsKeyFilePath(), 0700)
+		if err := os.MkdirAll(distro.LuksInitramfsKeyFilePath(), 0700); err != nil {
+			return fmt.Errorf("creating directory for keyfile: %v", err)
+		}
 		keyFilePath := filepath.Join(distro.LuksInitramfsKeyFilePath(), luks.Name)
 		devAlias := execUtil.DeviceAlias(*luks.Device)
 		if util.NilOrEmpty(luks.KeyFile.Source) {

internal/exec/stages/disks/partitions.go

@@ -322,7 +322,9 @@ func (s stage) partitionDisk(dev types.Disk, devAlias string) error {
 		op := sgdisk.Begin(s.Logger, devAlias)
 		s.Logger.Info("wiping partition table requested on %q", devAlias)
 		op.WipeTable(true)
-		op.Commit()
+		if err := op.Commit(); err != nil {
+			return err
+		}
 	}
 
 	// Ensure all partitions with number 0 are last

internal/exec/util/passwd.go

@@ -218,7 +218,7 @@ func (u Util) AuthorizeSSHKeys(c types.PasswdUser) error {
 		if err != nil {
 			return fmt.Errorf("failed to set SSH key: %v", err)
 		}
-		journal.Send(fmt.Sprintf("wrote ssh authorized keys file for user: %s", c.Name), journal.PriInfo, map[string]string{
+		_ = journal.Send(fmt.Sprintf("wrote ssh authorized keys file for user: %s", c.Name), journal.PriInfo, map[string]string{
 			"IGNITION_USER_NAME": c.Name,
 			"IGNITION_PATH":      path,
 			"MESSAGE_ID":         ignitionSSHAuthorizedkeysMessageID,

internal/exec/util/user_group_lookup_test.go

@@ -63,7 +63,10 @@ func TestUserLookup(t *testing.T) {
 
 	// perform a user lookup to ensure libnss_files.so is loaded
 	// note this assumes /etc/nsswitch.conf invokes files.
-	user.Lookup("root")
+	_, err := user.Lookup("root")
+	if err != nil {
+		t.Fatalf("user lookup failed: %v", err)
+	}
 
 	td, err := tempBase()
 	if err != nil {

tests/filesystem.go

@@ -470,7 +470,9 @@ func createFilesFromSlice(basedir string, files []types.File) error {
 			}
 			writer.Flush()
 		}
-		os.Chown(filepath.Join(basedir, file.Directory, file.Name), file.User, file.Group)
+		if err := os.Chown(filepath.Join(basedir, file.Directory, file.Name), file.User, file.Group); err != nil {
+			return err
+		}
 	}
 	return nil
 }