ceph-csi/internal/util/util.go
Rakshith R 43f753760b cleanup: resolve nlreturn linter issues
nlreturn linter requires a new line before return
and branch statements except when the return is alone
inside a statement group (such as an if statement) to
increase code clarity. This commit addresses such issues.

Updates: #1586

Signed-off-by: Rakshith R <rar@redhat.com>
2021-07-22 06:05:01 +00:00

368 lines
11 KiB
Go

/*
Copyright 2019 The Ceph-CSI Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package util
import (
"context"
"errors"
"fmt"
"math"
"os"
"runtime"
"strings"
"time"
"golang.org/x/sys/unix"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/cloud-provider/volume/helpers"
"k8s.io/utils/mount"
)
// RoundOffVolSize rounds up given quantity up to chunks of MiB/GiB.
func RoundOffVolSize(size int64) int64 {
size = RoundOffBytes(size)
// convert size back to MiB for rbd CLI
return size / helpers.MiB
}
// RoundOffBytes converts roundoff the size
// 1.1Mib will be round off to 2Mib same for GiB
// size less than 1MiB will be round off to 1MiB.
func RoundOffBytes(bytes int64) int64 {
var num int64
// round off the value if its in decimal
if floatBytes := float64(bytes); floatBytes < helpers.GiB {
num = int64(math.Ceil(floatBytes / helpers.MiB))
num *= helpers.MiB
} else {
num = int64(math.Ceil(floatBytes / helpers.GiB))
num *= helpers.GiB
}
return num
}
// variables which will be set during the build time.
var (
// GitCommit tell the latest git commit image is built from.
GitCommit string
// DriverVersion which will be driver version.
DriverVersion string
)
// Config holds the parameters list which can be configured.
type Config struct {
Vtype string // driver type [rbd|cephfs|liveness|controller]
Endpoint string // CSI endpoint
DriverName string // name of the driver
DriverNamespace string // namespace in which driver is deployed
NodeID string // node id
InstanceID string // unique ID distinguishing this instance of Ceph CSI
PluginPath string // location of cephcsi plugin
StagingPath string // location of cephcsi staging path
DomainLabels string // list of domain labels to read from the node
// metrics related flags
MetricsPath string // path of prometheus endpoint where metrics will be available
HistogramOption string // Histogram option for grpc metrics, should be comma separated value,
// ex:= "0.5,2,6" where start=0.5 factor=2, count=6
MetricsIP string // TCP port for liveness/ metrics requests
PidLimit int // PID limit to configure through cgroups")
MetricsPort int // TCP port for liveness/grpc metrics requests
PollTime time.Duration // time interval in seconds between each poll
PoolTimeout time.Duration // probe timeout in seconds
EnableGRPCMetrics bool // option to enable grpc metrics
EnableProfiling bool // flag to enable profiling
IsControllerServer bool // if set to true start provisoner server
IsNodeServer bool // if set to true start node server
Version bool // cephcsi version
// SkipForceFlatten is set to false if the kernel supports mounting of
// rbd image or the image chain has the deep-flatten feature.
SkipForceFlatten bool
// cephfs related flags
ForceKernelCephFS bool // force to use the ceph kernel client even if the kernel is < 4.17
// RbdHardMaxCloneDepth is the hard limit for maximum number of nested volume clones that are taken before a flatten
// occurs
RbdHardMaxCloneDepth uint
// RbdSoftMaxCloneDepth is the soft limit for maximum number of nested volume clones that are taken before a flatten
// occurs
RbdSoftMaxCloneDepth uint
// MaxSnapshotsOnImage represents the maximum number of snapshots allowed
// on rbd image without flattening, once the limit is reached cephcsi will
// start flattening the older rbd images to allow more snapshots
MaxSnapshotsOnImage uint
// MinSnapshotsOnImage represents the soft limit for maximum number of
// snapshots allowed on rbd image without flattening, once the soft limit is
// reached cephcsi will start flattening the older rbd images.
MinSnapshotsOnImage uint
}
// ValidateDriverName validates the driver name.
func ValidateDriverName(driverName string) error {
if driverName == "" {
return errors.New("driver name is empty")
}
const reqDriverNameLen = 63
if len(driverName) > reqDriverNameLen {
return errors.New("driver name length should be less than 63 chars")
}
var err error
for _, msg := range validation.IsDNS1123Subdomain(strings.ToLower(driverName)) {
if err == nil {
err = errors.New(msg)
continue
}
err = fmt.Errorf("%s: %w", msg, err)
}
return err
}
// GetKernelVersion returns the version of the running Unix (like) system from the
// 'utsname' structs 'release' component.
func GetKernelVersion() (string, error) {
utsname := unix.Utsname{}
if err := unix.Uname(&utsname); err != nil {
return "", err
}
return strings.TrimRight(string(utsname.Release[:]), "\x00"), nil
}
// KernelVersion holds kernel related information.
type KernelVersion struct {
Version int
PatchLevel int
SubLevel int
ExtraVersion int // prefix of the part after the first "-"
Distribution string // component of full extraversion
Backport bool // backports have a fixed version/patchlevel/sublevel
}
// parseKernelRelease parses a kernel release version string into:
// version, patch version, sub version and extra version.
func parseKernelRelease(release string) (int, int, int, int, error) {
version := 0
patchlevel := 0
minVersions := 2
extra := ""
n, err := fmt.Sscanf(release, "%d.%d%s", &version, &patchlevel, &extra)
if n < minVersions && err != nil {
return 0, 0, 0, 0, fmt.Errorf("failed to parse version and patchlevel from %s: %w", release, err)
}
sublevel := 0
extraversion := 0
if n > minVersions {
n, err = fmt.Sscanf(extra, ".%d%s", &sublevel, &extra)
if err != nil && n == 0 && len(extra) > 0 && extra[0] != '-' && extra[0] == '.' {
return 0, 0, 0, 0, fmt.Errorf("failed to parse subversion from %s: %w", release, err)
}
extra = strings.TrimPrefix(extra, "-")
// ignore errors, 1st component of extraversion does not need to be an int
_, err = fmt.Sscanf(extra, "%d", &extraversion)
if err != nil {
// "go lint" wants err to be checked...
extraversion = 0
}
}
return version, patchlevel, sublevel, extraversion, nil
}
// CheckKernelSupport checks the running kernel and comparing it to known
// versions that have support for required features . Distributors of
// enterprise Linux have backported quota support to previous versions. This
// function checks if the running kernel is one of the versions that have the
// feature/fixes backported.
//
// `uname -r` (or Uname().Utsname.Release has a format like 1.2.3-rc.vendor
// This can be slit up in the following components: - version (1) - patchlevel
// (2) - sublevel (3) - optional, defaults to 0 - extraversion (rc) - optional,
// matching integers only - distribution (.vendor) - optional, match against
// whole `uname -r` string
//
// For matching multiple versions, the kernelSupport type contains a backport
// bool, which will cause matching
// version+patchlevel+sublevel+(>=extraversion)+(~distribution)
//
// In case the backport bool is false, a simple check for higher versions than
// version+patchlevel+sublevel is done.
func CheckKernelSupport(release string, supportedVersions []KernelVersion) bool {
version, patchlevel, sublevel, extraversion, err := parseKernelRelease(release)
if err != nil {
ErrorLogMsg("%v", err)
return false
}
// compare running kernel against known versions
for _, kernel := range supportedVersions {
if !kernel.Backport {
// deal with the default case(s), find >= match for version, patchlevel, sublevel
if version > kernel.Version || (version == kernel.Version && patchlevel > kernel.PatchLevel) ||
(version == kernel.Version && patchlevel == kernel.PatchLevel && sublevel >= kernel.SubLevel) {
return true
}
} else {
// specific backport, match distribution initially
if !strings.Contains(release, kernel.Distribution) {
continue
}
// strict match version, patchlevel, sublevel, and >= match extraversion
if version == kernel.Version && patchlevel == kernel.PatchLevel &&
sublevel == kernel.SubLevel && extraversion >= kernel.ExtraVersion {
return true
}
}
}
ErrorLogMsg("kernel %s does not support required features", release)
return false
}
// GenerateVolID generates a volume ID based on passed in parameters and version, to be returned
// to the CO system.
func GenerateVolID(
ctx context.Context,
monitors string,
cr *Credentials,
locationID int64,
pool, clusterID, objUUID string,
volIDVersion uint16) (string, error) {
var err error
if locationID == InvalidPoolID {
locationID, err = GetPoolID(monitors, cr, pool)
if err != nil {
return "", err
}
}
// generate the volume ID to return to the CO system
vi := CSIIdentifier{
LocationID: locationID,
EncodingVersion: volIDVersion,
ClusterID: clusterID,
ObjectUUID: objUUID,
}
volID, err := vi.ComposeCSIID()
return volID, err
}
// CreateMountPoint creates the directory with given path.
func CreateMountPoint(mountPath string) error {
return os.MkdirAll(mountPath, 0o750)
}
// checkDirExists checks directory exists or not.
func checkDirExists(p string) bool {
if _, err := os.Stat(p); os.IsNotExist(err) {
return false
}
return true
}
// IsMountPoint checks if the given path is mountpoint or not.
func IsMountPoint(p string) (bool, error) {
dummyMount := mount.New("")
notMnt, err := dummyMount.IsLikelyNotMountPoint(p)
if err != nil {
return false, err
}
return !notMnt, nil
}
// Mount mounts the source to target path.
func Mount(source, target, fstype string, options []string) error {
dummyMount := mount.New("")
return dummyMount.Mount(source, target, fstype, options)
}
// MountOptionsAdd adds the `add` mount options to the `options` and returns a
// new string. In case `add` is already present in the `options`, `add` is not
// added again.
func MountOptionsAdd(options string, add ...string) string {
opts := strings.Split(options, ",")
newOpts := []string{}
// clean original options from empty strings
for _, opt := range opts {
if opt != "" {
newOpts = append(newOpts, opt)
}
}
for _, opt := range add {
if opt != "" && !contains(newOpts, opt) {
newOpts = append(newOpts, opt)
}
}
return strings.Join(newOpts, ",")
}
func contains(s []string, key string) bool {
for _, v := range s {
if v == key {
return true
}
}
return false
}
// getKeys takes a map that uses strings for keys and returns a slice with the
// keys.
func getKeys(m map[string]interface{}) []string {
keys := make([]string, len(m))
i := 0
for k := range m {
keys[i] = k
i++
}
return keys
}
// CallStack returns the stack of the calls in the current goroutine. Useful
// for debugging or reporting errors. This is a friendly alternative to
// assert() or panic().
func CallStack() string {
stack := make([]byte, 2048)
_ = runtime.Stack(stack, false)
return string(stack)
}