enable gocritic linter

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

.golangci.yml

@@ -2,6 +2,7 @@ linters:
   enable:
     - contextcheck
     - gci
+    - gocritic
     - gofumpt
     - gosimple
     - ineffassign

pkg/testutils/echo/server/main.go

@@ -44,11 +44,13 @@ func main() {
 	// Start UDP server
 	addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%s", port))
 	if err != nil {
-		log.Fatalf("Error from net.ResolveUDPAddr(): %s", err)
+		log.Printf("Error from net.ResolveUDPAddr(): %s", err)
+		return
 	}
 	sock, err := net.ListenUDP("udp", addr)
 	if err != nil {
-		log.Fatalf("Error from ListenUDP(): %s", err)
+		log.Printf("Error from ListenUDP(): %s", err)
+		return
 	}
 	defer sock.Close()
 
@@ -56,7 +58,8 @@ func main() {
 	for {
 		n, addr, err := sock.ReadFrom(buffer)
 		if err != nil {
-			log.Fatalf("Error from ReadFrom(): %s", err)
+			log.Printf("Error from ReadFrom(): %s", err)
+			return
 		}
 		sock.SetWriteDeadline(time.Now().Add(1 * time.Minute))
 		_, err = sock.WriteTo(buffer[0:n], addr)

pkg/utils/sysctl/sysctl_linux_test.go

@@ -75,7 +75,7 @@ var _ = Describe("Sysctl tests", func() {
 	Describe("Sysctl", func() {
 		It("reads keys with dot separators", func() {
 			beforeEach()
-			sysctlIfaceName := strings.Replace(testIfaceName, ".", "/", -1)
+			sysctlIfaceName := strings.ReplaceAll(testIfaceName, ".", "/")
 			sysctlKey := fmt.Sprintf(sysctlDotKeyTemplate, sysctlIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey)
@@ -96,7 +96,7 @@ var _ = Describe("Sysctl tests", func() {
 	Describe("Sysctl", func() {
 		It("writes keys with dot separators", func() {
 			beforeEach()
-			sysctlIfaceName := strings.Replace(testIfaceName, ".", "/", -1)
+			sysctlIfaceName := strings.ReplaceAll(testIfaceName, ".", "/")
 			sysctlKey := fmt.Sprintf(sysctlDotKeyTemplate, sysctlIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey, "1")

plugins/ipam/dhcp/lease.go

@@ -83,7 +83,7 @@ var requestOptionsDefault = map[dhcp4.OptionCode]bool{
 	dhcp4.OptionSubnetMask: true,
 }
 
-func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptions []RequestOption) (
+func prepareOptions(cniArgs string, provideOptions []ProvideOption, requestOptions []RequestOption) (
 	map[dhcp4.OptionCode]bool, map[dhcp4.OptionCode][]byte, error,
 ) {
 	var optsRequesting map[dhcp4.OptionCode]bool
@@ -101,7 +101,7 @@ func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptio
 	// parse providing options map
 	var optParsed dhcp4.OptionCode
 	optsProviding = make(map[dhcp4.OptionCode][]byte)
-	for _, opt := range ProvideOptions {
+	for _, opt := range provideOptions {
 		optParsed, err = parseOptionName(string(opt.Option))
 		if err != nil {
 			return nil, nil, fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
@@ -123,7 +123,7 @@ func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptio
 	// parse necessary options map
 	optsRequesting = make(map[dhcp4.OptionCode]bool)
 	skipRequireDefault := false
-	for _, opt := range RequestOptions {
+	for _, opt := range requestOptions {
 		if opt.SkipDefault {
 			skipRequireDefault = true
 		}

plugins/ipam/host-local/backend/allocator/range_set.go

@@ -67,12 +67,10 @@ func (s *RangeSet) Canonicalize() error {
 		}
 		if i == 0 {
 			fam = len((*s)[i].RangeStart)
-		} else {
+		} else if fam != len((*s)[i].RangeStart) {
-			if fam != len((*s)[i].RangeStart) {
 			return fmt.Errorf("mixed address families")
 		}
 	}
-	}
 
 	// Make sure none of the ranges in the set overlap
 	l := len(*s)

plugins/ipam/host-local/backend/disk/backend.go

@@ -198,7 +198,7 @@ func (s *Store) GetByID(id string, ifname string) []net.IP {
 
 func GetEscapedPath(dataDir string, fname string) string {
 	if runtime.GOOS == "windows" {
-		fname = strings.Replace(fname, ":", "_", -1)
+		fname = strings.ReplaceAll(fname, ":", "_")
 	}
 	return filepath.Join(dataDir, fname)
 }

plugins/main/bridge/bridge_test.go

@@ -53,8 +53,9 @@ type Net struct {
 	IPAM       *allocator.IPAMConfig `json:"ipam"`
 	// RuntimeConfig struct {    // The capability arg
 	//	IPRanges []RangeSet `json:"ipRanges,omitempty"`
-	//} `json:"runtimeConfig,omitempty"`
 	// Args *struct {
+	// } `json:"runtimeConfig,omitempty"`
+
 	//	A *IPAMArgs `json:"cni"`
 	DNS           types.DNS              `json:"dns"`
 	RawPrevResult map[string]interface{} `json:"prevResult,omitempty"`
@@ -1497,11 +1498,12 @@ func (tester *testerV01xOr02x) cmdDelTest(tc testCase, dataDir string) {
 		err := testutils.CmdDelWithArgs(tester.args, func() error {
 			return cmdDel(tester.args)
 		})
-		if expect020DelError(tc) {
+		switch {
+		case expect020DelError(tc):
 			Expect(err).To(MatchError(tc.DelErr020))
-		} else if expect010DelError(tc) {
+		case expect010DelError(tc):
 			Expect(err).To(MatchError(tc.DelErr010))
-		} else {
+		default:
 			Expect(err).NotTo(HaveOccurred())
 		}
 		return nil

plugins/main/host-device/host-device.go

@@ -322,10 +322,11 @@ func getLink(devname, hwaddr, kernelpath, pciaddr string) (netlink.Link, error)
 	if err != nil {
 		return nil, fmt.Errorf("failed to list node links: %v", err)
 	}
+	switch {
 
-	if len(devname) > 0 {
+	case len(devname) > 0:
 		return netlink.LinkByName(devname)
-	} else if len(hwaddr) > 0 {
+	case len(hwaddr) > 0:
 		hwAddr, err := net.ParseMAC(hwaddr)
 		if err != nil {
 			return nil, fmt.Errorf("failed to parse MAC address %q: %v", hwaddr, err)
@@ -336,7 +337,7 @@ func getLink(devname, hwaddr, kernelpath, pciaddr string) (netlink.Link, error)
 				return link, nil
 			}
 		}
-	} else if len(kernelpath) > 0 {
+	case len(kernelpath) > 0:
 		if !filepath.IsAbs(kernelpath) || !strings.HasPrefix(kernelpath, "/sys/devices/") {
 			return nil, fmt.Errorf("kernel device path %q must be absolute and begin with /sys/devices/", kernelpath)
 		}
@@ -355,7 +356,7 @@ func getLink(devname, hwaddr, kernelpath, pciaddr string) (netlink.Link, error)
 				}
 			}
 		}
-	} else if len(pciaddr) > 0 {
+	case len(pciaddr) > 0:
 		netDir := filepath.Join(sysBusPCI, pciaddr, "net")
 		if _, err := os.Lstat(netDir); err != nil {
 			virtioNetDir := filepath.Join(sysBusPCI, pciaddr, "virtio*", "net")

plugins/main/macvlan/macvlan_test.go

@@ -50,8 +50,8 @@ type Net struct {
 	IPAM       *allocator.IPAMConfig `json:"ipam"`
 	// RuntimeConfig struct {    // The capability arg
 	//	IPRanges []RangeSet `json:"ipRanges,omitempty"`
-	//} `json:"runtimeConfig,omitempty"`
 	// Args *struct {
+	// } `json:"runtimeConfig,omitempty"`
 	//	A *IPAMArgs `json:"cni"`
 	DNS           types.DNS              `json:"dns"`
 	RawPrevResult map[string]interface{} `json:"prevResult,omitempty"`

plugins/main/tap/tap.go

@@ -173,14 +173,15 @@ func createLinkWithNetlink(tmpName string, mtu int, nsFd int, multiqueue bool, m
 }
 
 func createLink(tmpName string, conf *NetConf, netns ns.NetNS) error {
-	if conf.SelinuxContext != "" {
+	switch {
+	case conf.SelinuxContext != "":
 		if err := selinux.SetExecLabel(conf.SelinuxContext); err != nil {
 			return fmt.Errorf("failed set socket label: %v", err)
 		}
 		return createTapWithIptool(tmpName, conf.MTU, conf.MultiQueue, conf.Mac, conf.Owner, conf.Group)
-	} else if conf.Owner == nil || conf.Group == nil {
+	case conf.Owner == nil || conf.Group == nil:
 		return createTapWithIptool(tmpName, conf.MTU, conf.MultiQueue, conf.Mac, conf.Owner, conf.Group)
-	} else {
+	default:
 		return createLinkWithNetlink(tmpName, conf.MTU, int(netns.Fd()), conf.MultiQueue, conf.Mac, conf.Owner, conf.Group)
 	}
 }

plugins/meta/firewall/iptables.go

@@ -143,7 +143,7 @@ func (ib *iptablesBackend) checkRules(conf *FirewallNetConf, result *current.Res
 		}
 	}
 
-	if len(rules) <= 0 {
+	if len(rules) == 0 {
 		return nil
 	}
 

plugins/meta/tuning/tuning.go

@@ -334,7 +334,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 	err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
 		for key, value := range tuningConf.SysCtl {
-			key = strings.Replace(key, ".", string(os.PathSeparator), -1)
+			key = strings.ReplaceAll(key, ".", string(os.PathSeparator))
 
 			// If the key contains `IFNAME` - substitute it with args.IfName
 			// to allow setting sysctls on a particular interface, on which
@@ -439,7 +439,7 @@ func cmdCheck(args *skel.CmdArgs) error {
 	err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
 		// Check each configured value vs what's currently in the container
 		for key, confValue := range tuningConf.SysCtl {
-			fileName := filepath.Join("/proc/sys", strings.Replace(key, ".", "/", -1))
+			fileName := filepath.Join("/proc/sys", strings.ReplaceAll(key, ".", "/"))
 
 			contents, err := os.ReadFile(fileName)
 			if err != nil {