make lint: enable gocritic

`gocritic` is a powerful linter that helps in preventing certain kinds
of errors as well as enforcing a coding style.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

.golangci.yml

@@ -24,7 +24,6 @@ linters:
     - gochecknoglobals
     - gochecknoinits
     - goconst
-    - gocritic
     - gocyclo
     - golint
     - goimports

cmd/podman/build.go

@@ -116,21 +116,22 @@ func getContainerfiles(files []string) []string {
 func getNsValues(c *cliconfig.BuildValues) ([]buildah.NamespaceOption, error) {
 	var ret []buildah.NamespaceOption
 	if c.Network != "" {
-		if c.Network == "host" {
+		switch {
+		case c.Network == "host":
 			ret = append(ret, buildah.NamespaceOption{
 				Name: string(specs.NetworkNamespace),
 				Host: true,
 			})
-		} else if c.Network == "container" {
+		case c.Network == "container":
 			ret = append(ret, buildah.NamespaceOption{
 				Name: string(specs.NetworkNamespace),
 			})
-		} else if c.Network[0] == '/' {
+		case c.Network[0] == '/':
 			ret = append(ret, buildah.NamespaceOption{
 				Name: string(specs.NetworkNamespace),
 				Path: c.Network,
 			})
-		} else {
+		default:
 			return nil, fmt.Errorf("unsupported configuration network=%s", c.Network)
 		}
 	}

cmd/podman/common_libpod.go

@@ -24,7 +24,8 @@ func getAllOrLatestContainers(c *cliconfig.PodmanCommand, runtime *libpod.Runtim
 	var containers []*libpod.Container
 	var lastError error
 	var err error
-	if c.Bool("all") {
+	switch {
+	case c.Bool("all"):
 		if filterState != -1 {
 			var filterFuncs []libpod.ContainerFilter
 			filterFuncs = append(filterFuncs, func(c *libpod.Container) bool {
@@ -38,13 +39,13 @@ func getAllOrLatestContainers(c *cliconfig.PodmanCommand, runtime *libpod.Runtim
 		if err != nil {
 			return nil, errors.Wrapf(err, "unable to get %s containers", verb)
 		}
-	} else if c.Bool("latest") {
+	case c.Bool("latest"):
 		lastCtr, err := runtime.GetLatestContainer()
 		if err != nil {
 			return nil, errors.Wrapf(err, "unable to get latest container")
 		}
 		containers = append(containers, lastCtr)
-	} else {
+	default:
 		args := c.InputArgs
 		for _, i := range args {
 			container, err := runtime.LookupContainer(i)

cmd/podman/cp.go

@@ -138,25 +138,25 @@ func copyBetweenHostAndContainer(runtime *libpod.Runtime, src string, dest strin
 	hostOwner := idtools.IDPair{UID: int(hostUID), GID: int(hostGID)}
 
 	if isFromHostToCtr {
-		if isVol, volDestName, volName := isVolumeDestName(destPath, ctr); isVol {
+		if isVol, volDestName, volName := isVolumeDestName(destPath, ctr); isVol { //nolint(gocritic)
 			path, err := pathWithVolumeMount(ctr, runtime, volDestName, volName, destPath)
 			if err != nil {
 				return errors.Wrapf(err, "error getting destination path from volume %s", volDestName)
 			}
 			destPath = path
-		} else if isBindMount, mount := isBindMountDestName(destPath, ctr); isBindMount {
+		} else if isBindMount, mount := isBindMountDestName(destPath, ctr); isBindMount { //nolint(gocritic)
 			path, err := pathWithBindMountSource(mount, destPath)
 			if err != nil {
 				return errors.Wrapf(err, "error getting destination path from bind mount %s", mount.Destination)
 			}
 			destPath = path
-		} else if filepath.IsAbs(destPath) {
+		} else if filepath.IsAbs(destPath) { //nolint(gocritic)
 			cleanedPath, err := securejoin.SecureJoin(mountPoint, destPath)
 			if err != nil {
 				return err
 			}
 			destPath = cleanedPath
-		} else {
+		} else { //nolint(gocritic)
 			ctrWorkDir, err := securejoin.SecureJoin(mountPoint, ctr.WorkingDir())
 			if err != nil {
 				return err
@@ -172,25 +172,25 @@ func copyBetweenHostAndContainer(runtime *libpod.Runtime, src string, dest strin
 		}
 	} else {
 		destOwner = idtools.IDPair{UID: os.Getuid(), GID: os.Getgid()}
-		if isVol, volDestName, volName := isVolumeDestName(srcPath, ctr); isVol {
+		if isVol, volDestName, volName := isVolumeDestName(srcPath, ctr); isVol { //nolint(gocritic)
 			path, err := pathWithVolumeMount(ctr, runtime, volDestName, volName, srcPath)
 			if err != nil {
 				return errors.Wrapf(err, "error getting source path from volume %s", volDestName)
 			}
 			srcPath = path
-		} else if isBindMount, mount := isBindMountDestName(srcPath, ctr); isBindMount {
+		} else if isBindMount, mount := isBindMountDestName(srcPath, ctr); isBindMount { //nolint(gocritic)
 			path, err := pathWithBindMountSource(mount, srcPath)
 			if err != nil {
 				return errors.Wrapf(err, "error getting source path from bind mount %s", mount.Destination)
 			}
 			srcPath = path
-		} else if filepath.IsAbs(srcPath) {
+		} else if filepath.IsAbs(srcPath) { //nolint(gocritic)
 			cleanedPath, err := securejoin.SecureJoin(mountPoint, srcPath)
 			if err != nil {
 				return err
 			}
 			srcPath = cleanedPath
-		} else {
+		} else { //nolint(gocritic)
 			cleanedPath, err := securejoin.SecureJoin(mountPoint, filepath.Join(ctr.WorkingDir(), srcPath))
 			if err != nil {
 				return err

cmd/podman/history.go

@@ -115,14 +115,14 @@ func genHistoryFormat(format string, quiet bool) string {
 }
 
 // historyToGeneric makes an empty array of interfaces for output
-func historyToGeneric(templParams []historyTemplateParams, JSONParams []*image.History) (genericParams []interface{}) {
+func historyToGeneric(templParams []historyTemplateParams, jsonParams []*image.History) (genericParams []interface{}) {
 	if len(templParams) > 0 {
 		for _, v := range templParams {
 			genericParams = append(genericParams, interface{}(v))
 		}
 		return
 	}
-	for _, v := range JSONParams {
+	for _, v := range jsonParams {
 		genericParams = append(genericParams, interface{}(v))
 	}
 	return

cmd/podman/images.go

@@ -209,7 +209,7 @@ func (i imagesOptions) setOutputFormat() string {
 }
 
 // imagesToGeneric creates an empty array of interfaces for output
-func imagesToGeneric(templParams []imagesTemplateParams, JSONParams []imagesJSONParams) []interface{} {
+func imagesToGeneric(templParams []imagesTemplateParams, jsonParams []imagesJSONParams) []interface{} {
 	genericParams := []interface{}{}
 	if len(templParams) > 0 {
 		for _, v := range templParams {
@@ -217,7 +217,7 @@ func imagesToGeneric(templParams []imagesTemplateParams, JSONParams []imagesJSON
 		}
 		return genericParams
 	}
-	for _, v := range JSONParams {
+	for _, v := range jsonParams {
 		genericParams = append(genericParams, interface{}(v))
 	}
 	return genericParams
@@ -282,10 +282,8 @@ func getImagesTemplateOutput(ctx context.Context, images []*adapter.ContainerIma
 				if len(tag) == 71 && strings.HasPrefix(tag, "sha256:") {
 					imageDigest = digest.Digest(tag)
 					tag = ""
-				} else {
+				} else if img.Digest() != "" {
-					if img.Digest() != "" {
+					imageDigest = img.Digest()
-						imageDigest = img.Digest()
-					}
 				}
 				params := imagesTemplateParams{
 					Repository:  repo,

cmd/podman/main.go

@@ -72,17 +72,13 @@ var mainCommands = []*cobra.Command{
 }
 
 var rootCmd = &cobra.Command{
-	Use:  path.Base(os.Args[0]),
+	Use:                path.Base(os.Args[0]),
-	Long: "manage pods and images",
+	Long:               "manage pods and images",
-	RunE: commandRunE(),
+	RunE:               commandRunE(),
-	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+	PersistentPreRunE:  before,
-		return before(cmd, args)
+	PersistentPostRunE: after,
-	},
+	SilenceUsage:       true,
-	PersistentPostRunE: func(cmd *cobra.Command, args []string) error {
+	SilenceErrors:      true,
-		return after(cmd, args)
-	},
-	SilenceUsage:  true,
-	SilenceErrors: true,
 }
 
 var MainGlobalOpts cliconfig.MainFlags
@@ -160,16 +156,13 @@ func main() {
 	}
 	if err := rootCmd.Execute(); err != nil {
 		outputError(err)
-	} else {
+	} else if exitCode == define.ExecErrorCodeGeneric {
 		// The exitCode modified from define.ExecErrorCodeGeneric,
 		// indicates an application
 		// running inside of a container failed, as opposed to the
 		// podman command failed.  Must exit with that exit code
 		// otherwise command exited correctly.
-		if exitCode == define.ExecErrorCodeGeneric {
+		exitCode = 0
-			exitCode = 0
-		}
-
 	}
 
 	// Check if /etc/containers/registries.conf exists when running in

cmd/podman/pod_ps.go

@@ -320,13 +320,14 @@ func generatePodFilterFuncs(filter, filterValue string) (func(pod *adapter.Pod)
 // generate the template based on conditions given
 func genPodPsFormat(c *cliconfig.PodPsValues) string {
 	format := ""
-	if c.Format != "" {
+	switch {
+	case c.Format != "":
 		// "\t" from the command line is not being recognized as a tab
 		// replacing the string "\t" to a tab character if the user passes in "\t"
 		format = strings.Replace(c.Format, `\t`, "\t", -1)
-	} else if c.Quiet {
+	case c.Quiet:
 		format = formats.IDString
-	} else {
+	default:
 		format = "table {{.ID}}\t{{.Name}}\t{{.Status}}\t{{.Created}}"
 		if c.Bool("namespace") {
 			format += "\t{{.Cgroup}}\t{{.Namespaces}}"
@@ -341,14 +342,14 @@ func genPodPsFormat(c *cliconfig.PodPsValues) string {
 	return format
 }
 
-func podPsToGeneric(templParams []podPsTemplateParams, JSONParams []podPsJSONParams) (genericParams []interface{}) {
+func podPsToGeneric(templParams []podPsTemplateParams, jsonParams []podPsJSONParams) (genericParams []interface{}) {
 	if len(templParams) > 0 {
 		for _, v := range templParams {
 			genericParams = append(genericParams, interface{}(v))
 		}
 		return
 	}
-	for _, v := range JSONParams {
+	for _, v := range jsonParams {
 		genericParams = append(genericParams, interface{}(v))
 	}
 	return

cmd/podman/pod_stats.go

@@ -124,10 +124,8 @@ func podStatsCmd(c *cliconfig.PodStatsValues) error {
 		for i := 0; i < t.NumField(); i++ {
 			value := strings.ToUpper(splitCamelCase(t.Field(i).Name))
 			switch value {
-			case "CPU":
+			case "CPU", "MEM":
-				value = value + " %"
+				value += " %"
-			case "MEM":
-				value = value + " %"
 			case "MEM USAGE":
 				value = "MEM USAGE / LIMIT"
 			}
@@ -167,10 +165,8 @@ func podStatsCmd(c *cliconfig.PodStatsValues) error {
 			results := podContainerStatsToPodStatOut(newStats)
 			if len(format) == 0 {
 				outputToStdOut(results)
-			} else {
+			} else if err := printPSFormat(c.Format, results, headerNames); err != nil {
-				if err := printPSFormat(c.Format, results, headerNames); err != nil {
+				return err
-					return err
-				}
 			}
 		}
 		time.Sleep(time.Second)

cmd/podman/rmi.go

@@ -65,7 +65,7 @@ func rmiCmd(c *cliconfig.RmiValues) error {
 		return errors.Errorf("when using the --all switch, you may not pass any images names or IDs")
 	}
 
-	images := args[:]
+	images := args
 
 	removeImage := func(img *adapter.ContainerImage) {
 		response, err := runtime.RemoveImage(ctx, img, c.Force)

cmd/podman/shared/container.go

@@ -650,10 +650,7 @@ func getNamespaceInfo(path string) (string, error) {
 
 // getStrFromSquareBrackets gets the string inside [] from a string.
 func getStrFromSquareBrackets(cmd string) string {
-	reg, err := regexp.Compile(`.*\[|\].*`)
+	reg := regexp.MustCompile(`.*\[|\].*`)
-	if err != nil {
-		return ""
-	}
 	arr := strings.Split(reg.ReplaceAllLiteralString(cmd, ""), ",")
 	return strings.Join(arr, ",")
 }

cmd/podman/shared/create.go

@@ -444,11 +444,12 @@ func ParseCreateOpts(ctx context.Context, c *GenericCLIResults, runtime *libpod.
 	// USER
 	user := c.String("user")
 	if user == "" {
-		if usernsMode.IsKeepID() {
+		switch {
+		case usernsMode.IsKeepID():
 			user = fmt.Sprintf("%d:%d", rootless.GetRootlessUID(), rootless.GetRootlessGID())
-		} else if data == nil {
+		case data == nil:
 			user = "0"
-		} else {
+		default:
 			user = data.Config.User
 		}
 	}

cmd/podman/shared/pod.go

@@ -59,18 +59,20 @@ func CreatePodStatusResults(ctrStatuses map[string]define.ContainerStatus) (stri
 		}
 	}
 
-	if statuses[PodStateRunning] > 0 {
+	switch {
+	case statuses[PodStateRunning] > 0:
 		return PodStateRunning, nil
-	} else if statuses[PodStatePaused] == ctrNum {
+	case statuses[PodStatePaused] == ctrNum:
 		return PodStatePaused, nil
-	} else if statuses[PodStateStopped] == ctrNum {
+	case statuses[PodStateStopped] == ctrNum:
 		return PodStateExited, nil
-	} else if statuses[PodStateStopped] > 0 {
+	case statuses[PodStateStopped] > 0:
 		return PodStateStopped, nil
-	} else if statuses[PodStateErrored] > 0 {
+	case statuses[PodStateErrored] > 0:
 		return PodStateErrored, nil
+	default:
+		return PodStateCreated, nil
 	}
-	return PodStateCreated, nil
 }
 
 // GetNamespaceOptions transforms a slice of kernel namespaces

cmd/podman/stats.go

@@ -105,9 +105,10 @@ func statsCmd(c *cliconfig.StatsValues) error {
 	var ctrs []*libpod.Container
 
 	containerFunc := runtime.GetRunningContainers
-	if len(c.InputArgs) > 0 {
+	switch {
+	case len(c.InputArgs) > 0:
 		containerFunc = func() ([]*libpod.Container, error) { return runtime.GetContainersByList(c.InputArgs) }
-	} else if latest {
+	case latest:
 		containerFunc = func() ([]*libpod.Container, error) {
 			lastCtr, err := runtime.GetLatestContainer()
 			if err != nil {
@@ -115,7 +116,7 @@ func statsCmd(c *cliconfig.StatsValues) error {
 			}
 			return []*libpod.Container{lastCtr}, nil
 		}
-	} else if all {
+	case all:
 		containerFunc = runtime.GetAllContainers
 	}
 
@@ -219,14 +220,14 @@ func genStatsFormat(format string) string {
 }
 
 // imagesToGeneric creates an empty array of interfaces for output
-func statsToGeneric(templParams []statsOutputParams, JSONParams []statsOutputParams) (genericParams []interface{}) {
+func statsToGeneric(templParams []statsOutputParams, jsonParams []statsOutputParams) (genericParams []interface{}) {
 	if len(templParams) > 0 {
 		for _, v := range templParams {
 			genericParams = append(genericParams, interface{}(v))
 		}
 		return
 	}
-	for _, v := range JSONParams {
+	for _, v := range jsonParams {
 		genericParams = append(genericParams, interface{}(v))
 	}
 	return

cmd/podman/tree.go

@@ -113,12 +113,12 @@ func printImageChildren(layerMap map[string]*image.LayerInfo, layerID string, pr
 	intend := middleItem
 	if !last {
 		// add continueItem i.e. '|' for next iteration prefix
-		prefix = prefix + continueItem
+		prefix += continueItem
 	} else if len(ll.ChildID) > 1 || len(ll.ChildID) == 0 {
 		// The above condition ensure, alignment happens for node, which has more then 1 children.
 		// If node is last in printing hierarchy, it should not be printed as middleItem i.e. ├──
 		intend = lastItem
-		prefix = prefix + " "
+		prefix += " "
 	}
 
 	var tags string

cmd/podman/volume_ls.go

@@ -134,14 +134,14 @@ func genVolLsFormat(c *cliconfig.VolumeLsValues) string {
 }
 
 // Convert output to genericParams for printing
-func volLsToGeneric(templParams []volumeLsTemplateParams, JSONParams []volumeLsJSONParams) (genericParams []interface{}) {
+func volLsToGeneric(templParams []volumeLsTemplateParams, jsonParams []volumeLsJSONParams) (genericParams []interface{}) {
 	if len(templParams) > 0 {
 		for _, v := range templParams {
 			genericParams = append(genericParams, interface{}(v))
 		}
 		return
 	}
-	for _, v := range JSONParams {
+	for _, v := range jsonParams {
 		genericParams = append(genericParams, interface{}(v))
 	}
 	return

libpod/boltdb_state_internal.go

@@ -652,11 +652,9 @@ func (s *BoltState) addContainer(ctr *Container, pod *Pod) error {
 				if string(depCtrPod) != pod.ID() {
 					return errors.Wrapf(define.ErrInvalidArg, "container %s depends on container %s which is in a different pod (%s)", ctr.ID(), dependsCtr, string(depCtrPod))
 				}
-			} else {
+			} else if depCtrPod != nil {
 				// If we're not part of a pod, we cannot depend on containers in a pod
-				if depCtrPod != nil {
+				return errors.Wrapf(define.ErrInvalidArg, "container %s depends on container %s which is in a pod - containers not in pods cannot depend on containers in pods", ctr.ID(), dependsCtr)
-					return errors.Wrapf(define.ErrInvalidArg, "container %s depends on container %s which is in a pod - containers not in pods cannot depend on containers in pods", ctr.ID(), dependsCtr)
-				}
 			}
 
 			depNamespace := depCtrBkt.Get(namespaceKey)

libpod/container.go

@@ -472,11 +472,9 @@ func (c *Container) specFromState() (*spec.Spec, error) {
 		if err := json.Unmarshal(content, &returnSpec); err != nil {
 			return nil, errors.Wrapf(err, "error unmarshalling container config")
 		}
-	} else {
+	} else if !os.IsNotExist(err) {
 		// ignore when the file does not exist
-		if !os.IsNotExist(err) {
+		return nil, errors.Wrapf(err, "error opening container config")
-			return nil, errors.Wrapf(err, "error opening container config")
-		}
 	}
 
 	return returnSpec, nil

libpod/container.log.go

@@ -56,7 +56,7 @@ func (c *Container) readFromLogFile(options *logs.LogOptions, logChannel chan *l
 				continue
 			}
 			if nll.Partial() {
-				partial = partial + nll.Msg
+				partial += nll.Msg
 				continue
 			} else if !nll.Partial() && len(partial) > 1 {
 				nll.Msg = partial

libpod/container_graph.go

@@ -113,7 +113,7 @@ func detectCycles(graph *ContainerGraph) (bool, error) {
 		info := new(nodeInfo)
 		info.index = index
 		info.lowLink = index
-		index = index + 1
+		index++
 
 		nodes[node.id] = info
 

libpod/container_inspect.go

@@ -1214,11 +1214,12 @@ func (c *Container) generateInspectContainerHostConfig(ctrSpec *spec.Spec, named
 
 	// Network mode parsing.
 	networkMode := ""
-	if c.config.CreateNetNS {
+	switch {
+	case c.config.CreateNetNS:
 		networkMode = "default"
-	} else if c.config.NetNsCtr != "" {
+	case c.config.NetNsCtr != "":
 		networkMode = fmt.Sprintf("container:%s", c.config.NetNsCtr)
-	} else {
+	default:
 		// Find the spec's network namespace.
 		// If there is none, it's host networking.
 		// If there is one and it has a path, it's "ns:".

libpod/container_internal.go

@@ -22,7 +22,7 @@ import (
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/archive"
 	"github.com/containers/storage/pkg/mount"
-	"github.com/cyphar/filepath-securejoin"
+	securejoin "github.com/cyphar/filepath-securejoin"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/opencontainers/runtime-tools/generate"
 	"github.com/opencontainers/selinux/go-selinux/label"
@@ -339,7 +339,7 @@ func (c *Container) handleRestartPolicy(ctx context.Context) (restarted bool, er
 	c.newContainerEvent(events.Restart)
 
 	// Increment restart count
-	c.state.RestartCount = c.state.RestartCount + 1
+	c.state.RestartCount += 1
 	logrus.Debugf("Container %s now on retry %d", c.ID(), c.state.RestartCount)
 	if err := c.save(); err != nil {
 		return false, err
@@ -1286,7 +1286,7 @@ func (c *Container) restartWithTimeout(ctx context.Context, timeout uint) (err e
 // TODO: Add ability to override mount label so we can use this for Mount() too
 // TODO: Can we use this for export? Copying SHM into the export might not be
 // good
-func (c *Container) mountStorage() (_ string, Err error) {
+func (c *Container) mountStorage() (_ string, deferredErr error) {
 	var err error
 	// Container already mounted, nothing to do
 	if c.state.Mounted {
@@ -1307,7 +1307,7 @@ func (c *Container) mountStorage() (_ string, Err error) {
 			return "", errors.Wrapf(err, "failed to chown %s", c.config.ShmDir)
 		}
 		defer func() {
-			if Err != nil {
+			if deferredErr != nil {
 				if err := c.unmountSHM(c.config.ShmDir); err != nil {
 					logrus.Errorf("Error unmounting SHM for container %s after mount error: %v", c.ID(), err)
 				}
@@ -1324,7 +1324,7 @@ func (c *Container) mountStorage() (_ string, Err error) {
 			return "", err
 		}
 		defer func() {
-			if Err != nil {
+			if deferredErr != nil {
 				if err := c.unmount(false); err != nil {
 					logrus.Errorf("Error unmounting container %s after mount error: %v", c.ID(), err)
 				}
@@ -1339,7 +1339,7 @@ func (c *Container) mountStorage() (_ string, Err error) {
 			return "", err
 		}
 		defer func() {
-			if Err == nil {
+			if deferredErr == nil {
 				return
 			}
 			vol.lock.Lock()

libpod/container_internal_linux.go

@@ -62,7 +62,7 @@ func (c *Container) unmountSHM(mount string) error {
 
 // prepare mounts the container and sets up other required resources like net
 // namespaces
-func (c *Container) prepare() (Err error) {
+func (c *Container) prepare() error {
 	var (
 		wg                              sync.WaitGroup
 		netNS                           ns.NetNS
@@ -1277,21 +1277,21 @@ func (c *Container) generateResolvConf() (string, error) {
 	}
 
 	// If the user provided dns, it trumps all; then dns masq; then resolv.conf
-	if len(c.config.DNSServer) > 0 {
+	switch {
+	case len(c.config.DNSServer) > 0:
 		// We store DNS servers as net.IP, so need to convert to string
 		for _, server := range c.config.DNSServer {
 			nameservers = append(nameservers, server.String())
 		}
-	} else if len(cniNameServers) > 0 {
+	case len(cniNameServers) > 0:
 		nameservers = append(nameservers, cniNameServers...)
-	} else {
+	default:
 		// Make a new resolv.conf
 		nameservers = resolvconf.GetNameservers(resolv.Content)
 		// slirp4netns has a built in DNS server.
 		if c.config.NetMode.IsSlirp4netns() {
 			nameservers = append([]string{"10.0.2.3"}, nameservers...)
 		}
-
 	}
 
 	search := resolvconf.GetSearchDomains(resolv.Content)
@@ -1451,23 +1451,24 @@ func (c *Container) getOCICgroupPath() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	if (rootless.IsRootless() && !unified) || c.config.NoCgroups {
+	switch {
+	case (rootless.IsRootless() && !unified) || c.config.NoCgroups:
 		return "", nil
-	} else if c.runtime.config.CgroupManager == define.SystemdCgroupsManager {
+	case c.runtime.config.CgroupManager == define.SystemdCgroupsManager:
 		// When runc is set to use Systemd as a cgroup manager, it
 		// expects cgroups to be passed as follows:
 		// slice:prefix:name
 		systemdCgroups := fmt.Sprintf("%s:libpod:%s", path.Base(c.config.CgroupParent), c.ID())
 		logrus.Debugf("Setting CGroups for container %s to %s", c.ID(), systemdCgroups)
 		return systemdCgroups, nil
-	} else if c.runtime.config.CgroupManager == define.CgroupfsCgroupsManager {
+	case c.runtime.config.CgroupManager == define.CgroupfsCgroupsManager:
 		cgroupPath, err := c.CGroupPath()
 		if err != nil {
 			return "", err
 		}
 		logrus.Debugf("Setting CGroup path for container %s to %s", c.ID(), cgroupPath)
 		return cgroupPath, nil
-	} else {
+	default:
 		return "", errors.Wrapf(define.ErrInvalidArg, "invalid cgroup manager %s requested", c.runtime.config.CgroupManager)
 	}
 }

libpod/events/events.go

@@ -129,8 +129,6 @@ func StringToStatus(name string) (Status, error) {
 		return Attach, nil
 	case Checkpoint.String():
 		return Checkpoint, nil
-	case Restore.String():
-		return Restore, nil
 	case Cleanup.String():
 		return Cleanup, nil
 	case Commit.String():

libpod/healthcheck.go

@@ -238,7 +238,7 @@ func (c *Container) updateHealthCheckLog(hcl HealthCheckLog, inStartPeriod bool)
 		}
 		if !inStartPeriod {
 			// increment failing streak
-			healthCheck.FailingStreak = healthCheck.FailingStreak + 1
+			healthCheck.FailingStreak += 1
 			// if failing streak > retries, then status to unhealthy
 			if healthCheck.FailingStreak >= c.HealthCheckConfig().Retries {
 				healthCheck.Status = HealthCheckUnhealthy

libpod/image/image.go

@@ -902,8 +902,7 @@ func (i *Image) Annotations(ctx context.Context) (map[string]string, error) {
 		}
 	}
 	annotations := make(map[string]string)
-	switch manifestType {
+	if manifestType == ociv1.MediaTypeImageManifest {
-	case ociv1.MediaTypeImageManifest:
 		var m ociv1.Manifest
 		if err := json.Unmarshal(imageManifest, &m); err == nil {
 			for k, v := range m.Annotations {

libpod/kube.go

@@ -15,7 +15,7 @@ import (
 	"github.com/opencontainers/runtime-tools/generate"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	v12 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
@@ -365,11 +365,12 @@ func generateKubeVolumeMount(m specs.Mount) (v1.VolumeMount, v1.Volume, error) {
 	// neither a directory or a file lives here, default to creating a directory
 	// TODO should this be an error instead?
 	var hostPathType v1.HostPathType
-	if err != nil {
+	switch {
+	case err != nil:
 		hostPathType = v1.HostPathDirectoryOrCreate
-	} else if isDir {
+	case isDir:
 		hostPathType = v1.HostPathDirectory
-	} else {
+	default:
 		hostPathType = v1.HostPathFile
 	}
 	vo.HostPath.Type = &hostPathType

libpod/logs/log.go

@@ -96,7 +96,7 @@ func getTailLog(path string, tail int) ([]*LogLine, error) {
 		}
 		nlls = append(nlls, nll)
 		if !nll.Partial() {
-			tailCounter = tailCounter + 1
+			tailCounter++
 		}
 		if tailCounter == tail {
 			break
@@ -105,9 +105,9 @@ func getTailLog(path string, tail int) ([]*LogLine, error) {
 	// Now we iterate the results and assemble partial messages to become full messages
 	for _, nll := range nlls {
 		if nll.Partial() {
-			partial = partial + nll.Msg
+			partial += nll.Msg
 		} else {
-			nll.Msg = nll.Msg + partial
+			nll.Msg += partial
 			tailLog = append(tailLog, nll)
 			partial = ""
 		}
@@ -127,7 +127,7 @@ func (l *LogLine) String(options *LogOptions) string {
 		out = fmt.Sprintf("%s ", cid)
 	}
 	if options.Timestamps {
-		out = out + fmt.Sprintf("%s ", l.Time.Format(LogTimeFormat))
+		out += fmt.Sprintf("%s ", l.Time.Format(LogTimeFormat))
 	}
 	return out + l.Msg
 }

libpod/oci_conmon_linux.go

@@ -586,7 +586,8 @@ func (r *ConmonOCIRuntime) ExecContainer(c *Container, sessionID string, options
 
 	// we don't want to step on users fds they asked to preserve
 	// Since 0-2 are used for stdio, start the fds we pass in at preserveFDs+3
-	execCmd.Env = append(r.conmonEnv, fmt.Sprintf("_OCI_SYNCPIPE=%d", options.PreserveFDs+3), fmt.Sprintf("_OCI_STARTPIPE=%d", options.PreserveFDs+4), fmt.Sprintf("_OCI_ATTACHPIPE=%d", options.PreserveFDs+5))
+	execCmd.Env = r.conmonEnv
+	execCmd.Env = append(execCmd.Env, fmt.Sprintf("_OCI_SYNCPIPE=%d", options.PreserveFDs+3), fmt.Sprintf("_OCI_STARTPIPE=%d", options.PreserveFDs+4), fmt.Sprintf("_OCI_ATTACHPIPE=%d", options.PreserveFDs+5))
 	execCmd.Env = append(execCmd.Env, conmonEnv...)
 
 	execCmd.ExtraFiles = append(execCmd.ExtraFiles, childSyncPipe, childStartPipe, childAttachPipe)
@@ -998,7 +999,8 @@ func (r *ConmonOCIRuntime) createOCIContainer(ctr *Container, restoreOptions *Co
 		return err
 	}
 
-	cmd.Env = append(r.conmonEnv, fmt.Sprintf("_OCI_SYNCPIPE=%d", 3), fmt.Sprintf("_OCI_STARTPIPE=%d", 4))
+	cmd.Env = r.conmonEnv
+	cmd.Env = append(cmd.Env, fmt.Sprintf("_OCI_SYNCPIPE=%d", 3), fmt.Sprintf("_OCI_STARTPIPE=%d", 4))
 	cmd.Env = append(cmd.Env, conmonEnv...)
 	cmd.ExtraFiles = append(cmd.ExtraFiles, childSyncPipe, childStartPipe)
 	cmd.ExtraFiles = append(cmd.ExtraFiles, envFiles...)
@@ -1306,12 +1308,10 @@ func (r *ConmonOCIRuntime) moveConmonToCgroupAndSignal(ctr *Container, cmd *exec
 			control, err := cgroups.New(cgroupPath, &spec.LinuxResources{})
 			if err != nil {
 				logrus.Warnf("Failed to add conmon to cgroupfs sandbox cgroup: %v", err)
-			} else {
+			} else if err := control.AddPid(cmd.Process.Pid); err != nil {
 				// we need to remove this defer and delete the cgroup once conmon exits
 				// maybe need a conmon monitor?
-				if err := control.AddPid(cmd.Process.Pid); err != nil {
+				logrus.Warnf("Failed to add conmon to cgroupfs sandbox cgroup: %v", err)
-					logrus.Warnf("Failed to add conmon to cgroupfs sandbox cgroup: %v", err)
-				}
 			}
 		}
 	}

libpod/options.go

@@ -733,7 +733,9 @@ func WithExitCommand(exitCommand []string) CtrCreateOption {
 			return define.ErrCtrFinalized
 		}
 
-		ctr.config.ExitCommand = append(exitCommand, ctr.ID())
+		ctr.config.ExitCommand = exitCommand
+		ctr.config.ExitCommand = append(ctr.config.ExitCommand, ctr.ID())
+
 		return nil
 	}
 }

libpod/runtime.go

@@ -180,12 +180,13 @@ func getLockManager(runtime *Runtime) (lock.Manager, error) {
 		// Set up the lock manager
 		manager, err = lock.OpenSHMLockManager(lockPath, runtime.config.NumLocks)
 		if err != nil {
-			if os.IsNotExist(errors.Cause(err)) {
+			switch {
+			case os.IsNotExist(errors.Cause(err)):
 				manager, err = lock.NewSHMLockManager(lockPath, runtime.config.NumLocks)
 				if err != nil {
 					return nil, errors.Wrapf(err, "failed to get new shm lock manager")
 				}
-			} else if errors.Cause(err) == syscall.ERANGE && runtime.doRenumber {
+			case errors.Cause(err) == syscall.ERANGE && runtime.doRenumber:
 				logrus.Debugf("Number of locks does not match - removing old locks")
 
 				// ERANGE indicates a lock numbering mismatch.
@@ -199,7 +200,7 @@ func getLockManager(runtime *Runtime) (lock.Manager, error) {
 				if err != nil {
 					return nil, err
 				}
-			} else {
+			default:
 				return nil, err
 			}
 		}
@@ -289,10 +290,8 @@ func makeRuntime(ctx context.Context, runtime *Runtime) (err error) {
 		logrus.Debug("Not configuring container store")
 	} else if runtime.noStore {
 		logrus.Debug("No store required. Not opening container store.")
-	} else {
+	} else if err := runtime.configureStore(); err != nil {
-		if err := runtime.configureStore(); err != nil {
+		return err
-			return err
-		}
 	}
 	defer func() {
 		if err != nil && store != nil {
@@ -718,18 +717,14 @@ func (r *Runtime) generateName() (string, error) {
 		// Make sure container with this name does not exist
 		if _, err := r.state.LookupContainer(name); err == nil {
 			continue
-		} else {
+		} else if errors.Cause(err) != define.ErrNoSuchCtr {
-			if errors.Cause(err) != define.ErrNoSuchCtr {
+			return "", err
-				return "", err
-			}
 		}
 		// Make sure pod with this name does not exist
 		if _, err := r.state.LookupPod(name); err == nil {
 			continue
-		} else {
+		} else if errors.Cause(err) != define.ErrNoSuchPod {
-			if errors.Cause(err) != define.ErrNoSuchPod {
+			return "", err
-				return "", err
-			}
 		}
 		return name, nil
 	}

libpod/runtime_cstorage.go

@@ -107,15 +107,13 @@ func (r *Runtime) removeStorageContainer(idOrName string, force bool) error {
 		if timesMounted > 0 {
 			return errors.Wrapf(define.ErrCtrStateInvalid, "container %q is mounted and cannot be removed without using force", idOrName)
 		}
-	} else {
+	} else if _, err := r.store.Unmount(ctr.ID, true); err != nil {
-		if _, err := r.store.Unmount(ctr.ID, true); err != nil {
+		if errors.Cause(err) == storage.ErrContainerUnknown {
-			if errors.Cause(err) == storage.ErrContainerUnknown {
+			// Container again gone, no error
-				// Container again gone, no error
+			logrus.Warnf("Storage for container %s already removed", ctr.ID)
-				logrus.Warnf("Storage for container %s already removed", ctr.ID)
+			return nil
-				return nil
-			}
-			return errors.Wrapf(err, "error unmounting container %q", idOrName)
 		}
+		return errors.Wrapf(err, "error unmounting container %q", idOrName)
 	}
 
 	if err := r.store.DeleteContainer(ctr.ID); err != nil {

libpod/runtime_ctr.go

@@ -234,15 +234,16 @@ func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (c *Contai
 			}
 		case define.SystemdCgroupsManager:
 			if ctr.config.CgroupParent == "" {
-				if pod != nil && pod.config.UsePodCgroup {
+				switch {
+				case pod != nil && pod.config.UsePodCgroup:
 					podCgroup, err := pod.CgroupPath()
 					if err != nil {
 						return nil, errors.Wrapf(err, "error retrieving pod %s cgroup", pod.ID())
 					}
 					ctr.config.CgroupParent = podCgroup
-				} else if rootless.IsRootless() {
+				case rootless.IsRootless():
 					ctr.config.CgroupParent = SystemdDefaultRootlessCgroupParent
-				} else {
+				default:
 					ctr.config.CgroupParent = SystemdDefaultCgroupParent
 				}
 			} else if len(ctr.config.CgroupParent) < 6 || !strings.HasSuffix(path.Base(ctr.config.CgroupParent), ".slice") {
@@ -361,10 +362,8 @@ func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (c *Contai
 		if err := r.state.AddContainerToPod(pod, ctr); err != nil {
 			return nil, err
 		}
-	} else {
+	} else if err := r.state.AddContainer(ctr); err != nil {
-		if err := r.state.AddContainer(ctr); err != nil {
+		return nil, err
-			return nil, err
-		}
 	}
 	ctr.newContainerEvent(events.Create)
 	return ctr, nil

libpod/runtime_pod_linux.go

@@ -19,7 +19,7 @@ import (
 )
 
 // NewPod makes a new, empty pod
-func (r *Runtime) NewPod(ctx context.Context, options ...PodCreateOption) (_ *Pod, Err error) {
+func (r *Runtime) NewPod(ctx context.Context, options ...PodCreateOption) (_ *Pod, deferredErr error) {
 	r.lock.Lock()
 	defer r.lock.Unlock()
 
@@ -65,7 +65,7 @@ func (r *Runtime) NewPod(ctx context.Context, options ...PodCreateOption) (_ *Po
 	pod.config.LockID = pod.lock.ID()
 
 	defer func() {
-		if Err != nil {
+		if deferredErr != nil {
 			if err := pod.lock.Free(); err != nil {
 				logrus.Errorf("Error freeing pod lock after failed creation: %v", err)
 			}
@@ -126,7 +126,7 @@ func (r *Runtime) NewPod(ctx context.Context, options ...PodCreateOption) (_ *Po
 		return nil, errors.Wrapf(err, "error adding pod to state")
 	}
 	defer func() {
-		if Err != nil {
+		if deferredErr != nil {
 			if err := r.removePod(ctx, pod, true, true); err != nil {
 				logrus.Errorf("Error removing pod after pause container creation failure: %v", err)
 			}

libpod/runtime_volume_linux.go

@@ -28,7 +28,7 @@ func (r *Runtime) NewVolume(ctx context.Context, options ...VolumeCreateOption)
 }
 
 // newVolume creates a new empty volume
-func (r *Runtime) newVolume(ctx context.Context, options ...VolumeCreateOption) (_ *Volume, Err error) {
+func (r *Runtime) newVolume(ctx context.Context, options ...VolumeCreateOption) (_ *Volume, deferredErr error) {
 	volume, err := newVolume(r)
 	if err != nil {
 		return nil, errors.Wrapf(err, "error creating volume")
@@ -98,7 +98,7 @@ func (r *Runtime) newVolume(ctx context.Context, options ...VolumeCreateOption)
 	volume.config.LockID = volume.lock.ID()
 
 	defer func() {
-		if Err != nil {
+		if deferredErr != nil {
 			if err := volume.lock.Free(); err != nil {
 				logrus.Errorf("Error freeing volume lock after failed creation: %v", err)
 			}

libpod/volume_internal_linux.go

@@ -39,7 +39,7 @@ func (v *Volume) mount() error {
 	// If the count is non-zero, the volume is already mounted.
 	// Nothing to do.
 	if v.state.MountCount > 0 {
-		v.state.MountCount = v.state.MountCount + 1
+		v.state.MountCount += 1
 		logrus.Debugf("Volume %s mount count now at %d", v.Name(), v.state.MountCount)
 		return v.save()
 	}
@@ -81,7 +81,7 @@ func (v *Volume) mount() error {
 	logrus.Debugf("Mounted volume %s", v.Name())
 
 	// Increment the mount counter
-	v.state.MountCount = v.state.MountCount + 1
+	v.state.MountCount += 1
 	logrus.Debugf("Volume %s mount count now at %d", v.Name(), v.state.MountCount)
 	return v.save()
 }
@@ -124,7 +124,7 @@ func (v *Volume) unmount(force bool) error {
 	}
 
 	if !force {
-		v.state.MountCount = v.state.MountCount - 1
+		v.state.MountCount -= 1
 	} else {
 		v.state.MountCount = 0
 	}

pkg/adapter/containers.go

@@ -609,11 +609,12 @@ func (r *LocalRuntime) Restore(ctx context.Context, c *cliconfig.RestoreValues)
 		return state == define.ContainerStateExited
 	})
 
-	if c.Import != "" {
+	switch {
+	case c.Import != "":
 		containers, err = crImportCheckpoint(ctx, r.Runtime, c.Import, c.Name)
-	} else if c.All {
+	case c.All:
 		containers, err = r.GetContainers(filterFuncs...)
-	} else {
+	default:
 		containers, err = shortcuts.GetContainersByContext(false, c.Latest, c.InputArgs, r.Runtime)
 	}
 	if err != nil {
@@ -835,25 +836,26 @@ func (r *LocalRuntime) Restart(ctx context.Context, c *cliconfig.RestartValues)
 	inputTimeout := c.Timeout
 
 	// Handle --latest
-	if c.Latest {
+	switch {
+	case c.Latest:
 		lastCtr, err := r.Runtime.GetLatestContainer()
 		if err != nil {
 			return nil, nil, errors.Wrapf(err, "unable to get latest container")
 		}
 		restartContainers = append(restartContainers, lastCtr)
-	} else if c.Running {
+	case c.Running:
 		containers, err = r.GetRunningContainers()
 		if err != nil {
 			return nil, nil, err
 		}
 		restartContainers = append(restartContainers, containers...)
-	} else if c.All {
+	case c.All:
 		containers, err = r.Runtime.GetAllContainers()
 		if err != nil {
 			return nil, nil, err
 		}
 		restartContainers = append(restartContainers, containers...)
-	} else {
+	default:
 		for _, id := range c.InputArgs {
 			ctr, err := r.Runtime.LookupContainer(id)
 			if err != nil {

pkg/adapter/runtime.go

@@ -407,7 +407,8 @@ func (r *LocalRuntime) Events(c *cliconfig.EventValues) error {
 	}
 	w := bufio.NewWriter(os.Stdout)
 	for event := range eventChannel {
-		if c.Format == formats.JSONString {
+		switch {
+		case c.Format == formats.JSONString:
 			jsonStr, err := event.ToJSONString()
 			if err != nil {
 				return errors.Wrapf(err, "unable to format json")
@@ -415,11 +416,11 @@ func (r *LocalRuntime) Events(c *cliconfig.EventValues) error {
 			if _, err := w.Write([]byte(jsonStr)); err != nil {
 				return err
 			}
-		} else if len(c.Format) > 0 {
+		case len(c.Format) > 0:
 			if err := tmpl.Execute(w, event); err != nil {
 				return err
 			}
-		} else {
+		default:
 			if _, err := w.Write([]byte(event.ToHumanReadable())); err != nil {
 				return err
 			}

pkg/adapter/shortcuts/shortcuts.go

@@ -42,12 +42,13 @@ func GetContainersByContext(all, latest bool, names []string, runtime *libpod.Ru
 	var ctr *libpod.Container
 	ctrs = []*libpod.Container{}
 
-	if all {
+	switch {
+	case all:
 		ctrs, err = runtime.GetAllContainers()
-	} else if latest {
+	case latest:
 		ctr, err = runtime.GetLatestContainer()
 		ctrs = append(ctrs, ctr)
-	} else {
+	default:
 		for _, n := range names {
 			ctr, e := runtime.LookupContainer(n)
 			if e != nil {

pkg/api/handlers/utils/handler.go

@@ -12,19 +12,19 @@ import (
 
 // WriteResponse encodes the given value as JSON or string and renders it for http client
 func WriteResponse(w http.ResponseWriter, code int, value interface{}) {
-	switch value.(type) {
+	switch v := value.(type) {
 	case string:
 		w.Header().Set("Content-Type", "text/plain; charset=us-ascii")
 		w.WriteHeader(code)
 
-		if _, err := fmt.Fprintln(w, value); err != nil {
+		if _, err := fmt.Fprintln(w, v); err != nil {
 			log.Errorf("unable to send string response: %q", err)
 		}
 	case *os.File:
 		w.Header().Set("Content-Type", "application/octet; charset=us-ascii")
 		w.WriteHeader(code)
 
-		if _, err := io.Copy(w, value.(*os.File)); err != nil {
+		if _, err := io.Copy(w, v); err != nil {
 			log.Errorf("unable to copy to response: %q", err)
 		}
 	default:

pkg/cgroups/cgroups.go

@@ -155,7 +155,7 @@ func (c *CgroupControl) getCgroupv1Path(name string) string {
 }
 
 // createCgroupv2Path creates the cgroupv2 path and enables all the available controllers
-func createCgroupv2Path(path string) (Err error) {
+func createCgroupv2Path(path string) (deferredError error) {
 	content, err := ioutil.ReadFile("/sys/fs/cgroup/cgroup.controllers")
 	if err != nil {
 		return errors.Wrapf(err, "read /sys/fs/cgroup/cgroup.controllers")
@@ -169,7 +169,7 @@ func createCgroupv2Path(path string) (Err error) {
 		if i == 0 {
 			res = fmt.Sprintf("+%s", c)
 		} else {
-			res = res + fmt.Sprintf(" +%s", c)
+			res += fmt.Sprintf(" +%s", c)
 		}
 	}
 	resByte := []byte(res)
@@ -186,7 +186,7 @@ func createCgroupv2Path(path string) (Err error) {
 			} else {
 				// If the directory was created, be sure it is not left around on errors.
 				defer func() {
-					if Err != nil {
+					if deferredError != nil {
 						os.Remove(current)
 					}
 				}()

pkg/spec/namespaces.go

@@ -44,7 +44,8 @@ func (c *NetworkConfig) ToCreateOptions(runtime *libpod.Runtime, userns *UserCon
 		}
 	}
 
-	if c.NetMode.IsNS() {
+	switch {
+	case c.NetMode.IsNS():
 		ns := c.NetMode.NS()
 		if ns == "" {
 			return nil, errors.Errorf("invalid empty user-defined network namespace")
@@ -53,13 +54,13 @@ func (c *NetworkConfig) ToCreateOptions(runtime *libpod.Runtime, userns *UserCon
 		if err != nil {
 			return nil, err
 		}
-	} else if c.NetMode.IsContainer() {
+	case c.NetMode.IsContainer():
 		connectedCtr, err := runtime.LookupContainer(c.NetMode.Container())
 		if err != nil {
 			return nil, errors.Wrapf(err, "container %q not found", c.NetMode.Container())
 		}
 		options = append(options, libpod.WithNetNSFrom(connectedCtr))
-	} else if !c.NetMode.IsHost() && !c.NetMode.IsNone() {
+	case !c.NetMode.IsHost() && !c.NetMode.IsNone():
 		postConfigureNetNS := userns.getPostConfigureNetNS()
 		options = append(options, libpod.WithNetNS(portBindings, postConfigureNetNS, string(c.NetMode), networks))
 	}
@@ -102,29 +103,31 @@ func (c *NetworkConfig) ToCreateOptions(runtime *libpod.Runtime, userns *UserCon
 // state of the NetworkConfig.
 func (c *NetworkConfig) ConfigureGenerator(g *generate.Generator) error {
 	netMode := c.NetMode
-	if netMode.IsHost() {
+	netCtr := netMode.Container()
+	switch {
+	case netMode.IsHost():
 		logrus.Debug("Using host netmode")
 		if err := g.RemoveLinuxNamespace(string(spec.NetworkNamespace)); err != nil {
 			return err
 		}
-	} else if netMode.IsNone() {
+	case netMode.IsNone():
 		logrus.Debug("Using none netmode")
-	} else if netMode.IsBridge() {
+	case netMode.IsBridge():
 		logrus.Debug("Using bridge netmode")
-	} else if netCtr := netMode.Container(); netCtr != "" {
+	case netCtr != "":
 		logrus.Debugf("using container %s netmode", netCtr)
-	} else if IsNS(string(netMode)) {
+	case IsNS(string(netMode)):
 		logrus.Debug("Using ns netmode")
 		if err := g.AddOrReplaceLinuxNamespace(string(spec.NetworkNamespace), NS(string(netMode))); err != nil {
 			return err
 		}
-	} else if IsPod(string(netMode)) {
+	case IsPod(string(netMode)):
 		logrus.Debug("Using pod netmode, unless pod is not sharing")
-	} else if netMode.IsSlirp4netns() {
+	case netMode.IsSlirp4netns():
 		logrus.Debug("Using slirp4netns netmode")
-	} else if netMode.IsUserDefined() {
+	case netMode.IsUserDefined():
 		logrus.Debug("Using user defined netmode")
-	} else {
+	default:
 		return errors.Errorf("unknown network mode")
 	}
 
@@ -220,7 +223,8 @@ func (c *CgroupConfig) ToCreateOptions(runtime *libpod.Runtime) ([]libpod.CtrCre
 // ToCreateOptions converts the input to container create options.
 func (c *UserConfig) ToCreateOptions(runtime *libpod.Runtime) ([]libpod.CtrCreateOption, error) {
 	options := make([]libpod.CtrCreateOption, 0)
-	if c.UsernsMode.IsNS() {
+	switch {
+	case c.UsernsMode.IsNS():
 		ns := c.UsernsMode.NS()
 		if ns == "" {
 			return nil, errors.Errorf("invalid empty user-defined user namespace")
@@ -230,13 +234,13 @@ func (c *UserConfig) ToCreateOptions(runtime *libpod.Runtime) ([]libpod.CtrCreat
 			return nil, err
 		}
 		options = append(options, libpod.WithIDMappings(*c.IDMappings))
-	} else if c.UsernsMode.IsContainer() {
+	case c.UsernsMode.IsContainer():
 		connectedCtr, err := runtime.LookupContainer(c.UsernsMode.Container())
 		if err != nil {
 			return nil, errors.Wrapf(err, "container %q not found", c.UsernsMode.Container())
 		}
 		options = append(options, libpod.WithUserNSFrom(connectedCtr))
-	} else {
+	default:
 		options = append(options, libpod.WithIDMappings(*c.IDMappings))
 	}
 
@@ -413,20 +417,22 @@ func (c *UtsConfig) ToCreateOptions(runtime *libpod.Runtime, pod *libpod.Pod) ([
 // of the UtsConfig.
 func (c *UtsConfig) ConfigureGenerator(g *generate.Generator, net *NetworkConfig, runtime *libpod.Runtime) error {
 	hostname := c.Hostname
+	utsCtrID := c.UtsMode.Container()
 	var err error
 	if hostname == "" {
-		if utsCtrID := c.UtsMode.Container(); utsCtrID != "" {
+		switch {
+		case utsCtrID != "":
 			utsCtr, err := runtime.GetContainer(utsCtrID)
 			if err != nil {
 				return errors.Wrapf(err, "unable to retrieve hostname from dependency container %s", utsCtrID)
 			}
 			hostname = utsCtr.Hostname()
-		} else if net.NetMode.IsHost() || c.UtsMode.IsHost() {
+		case net.NetMode.IsHost() || c.UtsMode.IsHost():
 			hostname, err = os.Hostname()
 			if err != nil {
 				return errors.Wrap(err, "unable to retrieve hostname of the host")
 			}
-		} else {
+		default:
 			logrus.Debug("No hostname set; container's hostname will default to runtime default")
 		}
 	}

pkg/spec/storage.go

@@ -409,9 +409,10 @@ func getBindMount(args []string) (spec.Mount, error) {
 			// ro=[true|false]
 			// rw
 			// rw=[true|false]
-			if len(kv) == 1 {
+			switch len(kv) {
+			case 1:
 				newMount.Options = append(newMount.Options, kv[0])
-			} else if len(kv) == 2 {
+			case 2:
 				switch strings.ToLower(kv[1]) {
 				case "true":
 					newMount.Options = append(newMount.Options, kv[0])
@@ -424,7 +425,7 @@ func getBindMount(args []string) (spec.Mount, error) {
 				default:
 					return newMount, errors.Wrapf(optionArgError, "%s must be set to true or false, instead received %q", kv[0], kv[1])
 				}
-			} else {
+			default:
 				return newMount, errors.Wrapf(optionArgError, "badly formatted option %q", val)
 			}
 		case "nosuid", "suid":

pkg/timetype/timestamp.go

@@ -34,7 +34,7 @@ func GetTimestamp(value string, reference time.Time) (string, error) {
 	// if the string has a Z or a + or three dashes use parse otherwise use parseinlocation
 	parseInLocation := !(strings.ContainsAny(value, "zZ+") || strings.Count(value, "-") == 3)
 
-	if strings.Contains(value, ".") {
+	if strings.Contains(value, ".") { // nolint(gocritic)
 		if parseInLocation {
 			format = rFC3339NanoLocal
 		} else {

pkg/util/utils.go

@@ -321,14 +321,14 @@ func ParseSignal(rawSignal string) (syscall.Signal, error) {
 }
 
 // ParseIDMapping takes idmappings and subuid and subgid maps and returns a storage mapping
-func ParseIDMapping(mode namespaces.UsernsMode, UIDMapSlice, GIDMapSlice []string, subUIDMap, subGIDMap string) (*storage.IDMappingOptions, error) {
+func ParseIDMapping(mode namespaces.UsernsMode, uidMapSlice, gidMapSlice []string, subUIDMap, subGIDMap string) (*storage.IDMappingOptions, error) {
 	options := storage.IDMappingOptions{
 		HostUIDMapping: true,
 		HostGIDMapping: true,
 	}
 
 	if mode.IsKeepID() {
-		if len(UIDMapSlice) > 0 || len(GIDMapSlice) > 0 {
+		if len(uidMapSlice) > 0 || len(gidMapSlice) > 0 {
 			return nil, errors.New("cannot specify custom mappings with --userns=keep-id")
 		}
 		if len(subUIDMap) > 0 || len(subGIDMap) > 0 {
@@ -384,17 +384,17 @@ func ParseIDMapping(mode namespaces.UsernsMode, UIDMapSlice, GIDMapSlice []strin
 	if subUIDMap == "" && subGIDMap != "" {
 		subUIDMap = subGIDMap
 	}
-	if len(GIDMapSlice) == 0 && len(UIDMapSlice) != 0 {
+	if len(gidMapSlice) == 0 && len(uidMapSlice) != 0 {
-		GIDMapSlice = UIDMapSlice
+		gidMapSlice = uidMapSlice
 	}
-	if len(UIDMapSlice) == 0 && len(GIDMapSlice) != 0 {
+	if len(uidMapSlice) == 0 && len(gidMapSlice) != 0 {
-		UIDMapSlice = GIDMapSlice
+		uidMapSlice = gidMapSlice
 	}
-	if len(UIDMapSlice) == 0 && subUIDMap == "" && os.Getuid() != 0 {
+	if len(uidMapSlice) == 0 && subUIDMap == "" && os.Getuid() != 0 {
-		UIDMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getuid())}
+		uidMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getuid())}
 	}
-	if len(GIDMapSlice) == 0 && subGIDMap == "" && os.Getuid() != 0 {
+	if len(gidMapSlice) == 0 && subGIDMap == "" && os.Getuid() != 0 {
-		GIDMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getgid())}
+		gidMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getgid())}
 	}
 
 	if subUIDMap != "" && subGIDMap != "" {
@@ -405,11 +405,11 @@ func ParseIDMapping(mode namespaces.UsernsMode, UIDMapSlice, GIDMapSlice []strin
 		options.UIDMap = mappings.UIDs()
 		options.GIDMap = mappings.GIDs()
 	}
-	parsedUIDMap, err := idtools.ParseIDMap(UIDMapSlice, "UID")
+	parsedUIDMap, err := idtools.ParseIDMap(uidMapSlice, "UID")
 	if err != nil {
 		return nil, err
 	}
-	parsedGIDMap, err := idtools.ParseIDMap(GIDMapSlice, "GID")
+	parsedGIDMap, err := idtools.ParseIDMap(gidMapSlice, "GID")
 	if err != nil {
 		return nil, err
 	}