cleanup: address gomnd warnings

Direct usage of numbers should be avoided.

Issue reported:
mnd: Magic number: X, in <argument> detected (gomnd)

Signed-off-by: Yug <yuggupta27@gmail.com>

cmd/cephcsi.go

@@ -39,6 +39,9 @@ const (
 	rbdDefaultName      = "rbd.csi.ceph.com"
 	cephfsDefaultName   = "cephfs.csi.ceph.com"
 	livenessDefaultName = "liveness.csi.ceph.com"
+
+	pollTime     = 60 // seconds
+	probeTimeout = 3  // seconds
 )
 
 var (
@@ -65,8 +68,8 @@ func init() {
 	// liveness/grpc metrics related flags
 	flag.IntVar(&conf.MetricsPort, "metricsport", 8080, "TCP port for liveness/grpc metrics requests")
 	flag.StringVar(&conf.MetricsPath, "metricspath", "/metrics", "path of prometheus endpoint where metrics will be available")
-	flag.DurationVar(&conf.PollTime, "polltime", time.Second*60, "time interval in seconds between each poll")
+	flag.DurationVar(&conf.PollTime, "polltime", time.Second*pollTime, "time interval in seconds between each poll")
-	flag.DurationVar(&conf.PoolTimeout, "timeout", time.Second*3, "probe timeout in seconds")
+	flag.DurationVar(&conf.PoolTimeout, "timeout", time.Second*probeTimeout, "probe timeout in seconds")
 
 	flag.BoolVar(&conf.EnableGRPCMetrics, "enablegrpcmetrics", false, "[DEPRECATED] enable grpc metrics")
 	flag.StringVar(&conf.HistogramOption, "histogramoption", "0.5,2,6",

internal/cephfs/volumemounter.go

@@ -47,6 +47,7 @@ var (
 
 	fusePidRx = regexp.MustCompile(`(?m)^ceph-fuse\[(.+)\]: starting fuse$`)
 
+	// nolint:gomnd // numbers specify Kernel versions.
 	quotaSupport = []util.KernelVersion{
 		{
 			Version:      4,
@@ -176,7 +177,10 @@ func mountFuse(ctx context.Context, mountPoint string, cr *util.Credentials, vol
 	// and PID of the ceph-fuse daemon for unmount
 
 	match := fusePidRx.FindSubmatch(stderr)
-	if len(match) != 2 {
+	// validMatchLength is set to 2 as match is expected
+	// to have 2 items, starting fuse and PID of the fuse daemon
+	const validMatchLength = 2
+	if len(match) != validMatchLength {
 		return fmt.Errorf("ceph-fuse failed: %s", stderr)
 	}
 

internal/csi-common/server.go

@@ -118,7 +118,8 @@ func (s *nonBlockingGRPCServer) serve(endpoint, hstOptions string, ids csi.Ident
 	util.DefaultLog("Listening for connections on address: %#v", listener.Addr())
 	if metrics {
 		ho := strings.Split(hstOptions, ",")
-		if len(ho) != 3 {
+		const expectedHo = 3
+		if len(ho) != expectedHo {
 			klog.Fatalf("invalid histogram options provided: %v", hstOptions)
 		}
 		start, e := strconv.ParseFloat(ho[0], 32)

internal/journal/voljournal.go

@@ -401,7 +401,7 @@ func (conn *Connection) UndoReservation(ctx context.Context,
 
 	cj := conn.config
 	if volName != "" {
-		if len(volName) < 36 {
+		if len(volName) < uuidEncodedLength {
 			return fmt.Errorf("unable to parse UUID from %s, too short", volName)
 		}
 

internal/rbd/clone.go

@@ -234,11 +234,13 @@ func (rv *rbdVolume) flattenCloneImage(ctx context.Context) error {
 	// can flatten the parent images before use to avoid the stale omap entries.
 	hardLimit := rbdHardMaxCloneDepth
 	softLimit := rbdSoftMaxCloneDepth
-	if rbdHardMaxCloneDepth < 2 {
+	// choosing 2 so that we don't need to flatten the image in the request.
-		hardLimit = rbdHardMaxCloneDepth - 2
+	const depthToAvoidFlatten = 2
+	if rbdHardMaxCloneDepth < depthToAvoidFlatten {
+		hardLimit = rbdHardMaxCloneDepth - depthToAvoidFlatten
 	}
-	if rbdSoftMaxCloneDepth < 2 {
+	if rbdSoftMaxCloneDepth < depthToAvoidFlatten {
-		softLimit = rbdSoftMaxCloneDepth - 2
+		softLimit = rbdSoftMaxCloneDepth - depthToAvoidFlatten
 	}
 	err := tempClone.getImageInfo()
 	if err == nil {

internal/rbd/nodeserver.go

@@ -65,6 +65,7 @@ var (
 	kernelRelease = ""
 	// deepFlattenSupport holds the list of kernel which support mapping rbd
 	// image with deep-flatten image feature
+	// nolint:gomnd // numbers specify Kernel versions.
 	deepFlattenSupport = []util.KernelVersion{
 		{
 			Version:      5,

internal/rbd/rbd_util.go

@@ -62,9 +62,6 @@ const (
 	rbdImageRequiresEncryption = "requiresEncryption"
 	// image metadata key for encryption
 	encryptionMetaKey = ".rbd.csi.ceph.com/encrypted"
-
-	// go-ceph will provide rbd.ImageOptionCloneFormat
-	imageOptionCloneFormat = librbd.RbdImageOption(12)
 )
 
 // rbdVolume represents a CSI volume and its RBD image specifics.
@@ -856,7 +853,7 @@ func (rv *rbdVolume) cloneRbdImageFromSnapshot(ctx context.Context, pSnapOpts *r
 		}
 	}
 
-	err = options.SetUint64(imageOptionCloneFormat, 2)
+	err = options.SetUint64(librbd.ImageOptionCloneFormat, 2)
 	if err != nil {
 		return fmt.Errorf("failed to set image features: %w", err)
 	}
@@ -1006,7 +1003,8 @@ func (ri *rbdImageMetadataStash) String() string {
 // JSON format.
 func stashRBDImageMetadata(volOptions *rbdVolume, path string) error {
 	var imgMeta = rbdImageMetadataStash{
-		Version:   2, // there are no checks for this at present
+		// there are no checks for this at present
+		Version:   2, // nolint:gomnd // number specifies version.
 		Pool:      volOptions.Pool,
 		ImageName: volOptions.RbdImageName,
 		Encrypted: volOptions.Encrypted,

internal/util/topology.go

@@ -52,7 +52,8 @@ func GetTopologyFromDomainLabels(domainLabels, nodeName, driverName string) (map
 
 	// size checks on domain label prefix
 	topologyPrefix := strings.ToLower("topology." + driverName)
-	if len(topologyPrefix) > 63 {
+	const lenLimit = 63
+	if len(topologyPrefix) > lenLimit {
 		return nil, fmt.Errorf("computed topology label prefix (%s) for node exceeds length limits", topologyPrefix)
 	}
 	// driverName is validated, and we are adding a lowercase "topology." to it, so no validation for conformance

internal/util/util.go

@@ -125,7 +125,8 @@ func ValidateDriverName(driverName string) error {
 		return errors.New("driver name is empty")
 	}
 
-	if len(driverName) > 63 {
+	const reqDriverNameLen = 63
+	if len(driverName) > reqDriverNameLen {
 		return errors.New("driver name length should be less than 63 chars")
 	}
 	var err error
@@ -191,7 +192,8 @@ func CheckKernelSupport(release string, supportedVersions []KernelVersion) bool
 		return false
 	}
 	sublevel := 0
-	if len(vers) >= 3 {
+	const minLenForSublvl = 3
+	if len(vers) >= minLenForSublvl {
 		sublevel, err = strconv.Atoi(vers[2])
 		if err != nil {
 			klog.Errorf("failed to parse sublevel from %s: %v", release, err)
@@ -200,7 +202,8 @@ func CheckKernelSupport(release string, supportedVersions []KernelVersion) bool
 	}
 	extra := strings.SplitN(release, "-", 2)
 	extraversion := 0
-	if len(extra) == 2 {
+	const expectedExtraLen = 2
+	if len(extra) == expectedExtraLen {
 		// ignore errors, 1st component of extraversion does not need to be an int
 		extraversion, err = strconv.Atoi(strings.Split(extra[1], ".")[0])
 		if err != nil {

internal/util/vault.go

@@ -151,7 +151,7 @@ func (kms *VaultKMS) GetPassphrase(key string) (string, error) {
 	}
 	defer resp.Body.Close()
 
-	if resp.StatusCode == 404 {
+	if resp.StatusCode == http.StatusNotFound {
 		return "", MissingPassphrase{fmt.Errorf("passphrase for %s not found", key)}
 	}
 	err = kms.processError(resp, fmt.Sprintf("get passphrase for %s", key))
@@ -219,7 +219,7 @@ func (kms *VaultKMS) DeletePassphrase(key string) error {
 		return fmt.Errorf("delete passphrase at %s request to vault failed: %s", key, err)
 	}
 	defer resp.Body.Close()
-	if resp.StatusCode != 404 {
+	if resp.StatusCode != http.StatusNotFound {
 		err = kms.processError(resp, "delete passphrase")
 		if err != nil {
 			return err

internal/util/volid.go

@@ -127,9 +127,12 @@ func (ci *CSIIdentifier) DecomposeCSIID(composedCSIID string) (err error) {
 	ci.ClusterID = composedCSIID[10 : 10+clusterIDLength]
 	// additional 1 for '-' separator
 	bytesToProcess -= (clusterIDLength + 1)
-	nextFieldStartIdx := 10 + clusterIDLength + 1
+	nextFieldStartIdx := (10 + clusterIDLength + 1)
 
-	if bytesToProcess < 17 {
+	// minLenToDecode is now 17 as composedCSIID should include
+	// atleast 16 for poolID encoding and 1 for '-' separator.
+	const minLenToDecode = 17
+	if bytesToProcess < minLenToDecode {
 		return errors.New("failed to decode CSI identifier, string underflow")
 	}
 	buf64, err := hex.DecodeString(composedCSIID[nextFieldStartIdx : nextFieldStartIdx+16])