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kubernetes/pkg/api/pod/warnings.go

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/*
Copyright 2021 The Kubernetes 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 pod
import (
"context"
"fmt"
"os"
"strings"
apiequality "k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/apimachinery/pkg/util/validation/field"
utilfeature "k8s.io/apiserver/pkg/util/feature"
nodeapi "k8s.io/kubernetes/pkg/api/node"
pvcutil "k8s.io/kubernetes/pkg/api/persistentvolumeclaim"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/apis/core/pods"
"k8s.io/kubernetes/pkg/features"
)
func GetWarningsForPod(ctx context.Context, pod, oldPod *api.Pod) []string {
if pod == nil {
return nil
}
var (
oldSpec *api.PodSpec
oldMeta *metav1.ObjectMeta
)
if oldPod != nil {
oldSpec = &oldPod.Spec
oldMeta = &oldPod.ObjectMeta
}
return warningsForPodSpecAndMeta(nil, &pod.Spec, &pod.ObjectMeta, oldSpec, oldMeta)
}
func GetWarningsForPodTemplate(ctx context.Context, fieldPath *field.Path, podTemplate, oldPodTemplate *api.PodTemplateSpec) []string {
if podTemplate == nil {
return nil
}
var (
oldSpec *api.PodSpec
oldMeta *metav1.ObjectMeta
)
if oldPodTemplate != nil {
oldSpec = &oldPodTemplate.Spec
oldMeta = &oldPodTemplate.ObjectMeta
}
return warningsForPodSpecAndMeta(fieldPath, &podTemplate.Spec, &podTemplate.ObjectMeta, oldSpec, oldMeta)
}
var deprecatedAnnotations = []struct {
key string
prefix string
message string
}{
{
key: `scheduler.alpha.kubernetes.io/critical-pod`,
message: `non-functional in v1.16+; use the "priorityClassName" field instead`,
},
{
key: `security.alpha.kubernetes.io/sysctls`,
message: `non-functional in v1.11+; use the "sysctls" field instead`,
},
{
key: `security.alpha.kubernetes.io/unsafe-sysctls`,
message: `non-functional in v1.11+; use the "sysctls" field instead`,
},
}
func warningsForPodSpecAndMeta(fieldPath *field.Path, podSpec *api.PodSpec, meta *metav1.ObjectMeta, oldPodSpec *api.PodSpec, oldMeta *metav1.ObjectMeta) []string {
var warnings []string
// use of deprecated node labels in selectors/affinity/topology
for k := range podSpec.NodeSelector {
if msg, deprecated := nodeapi.GetNodeLabelDeprecatedMessage(k); deprecated {
warnings = append(warnings, fmt.Sprintf("%s: %s", fieldPath.Child("spec", "nodeSelector").Key(k), msg))
}
}
if podSpec.Affinity != nil && podSpec.Affinity.NodeAffinity != nil {
n := podSpec.Affinity.NodeAffinity
if n.RequiredDuringSchedulingIgnoredDuringExecution != nil {
termFldPath := fieldPath.Child("spec", "affinity", "nodeAffinity", "requiredDuringSchedulingIgnoredDuringExecution", "nodeSelectorTerms")
for i, term := range n.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms {
warnings = append(warnings, nodeapi.GetWarningsForNodeSelectorTerm(term, false, termFldPath.Index(i))...)
}
}
preferredFldPath := fieldPath.Child("spec", "affinity", "nodeAffinity", "preferredDuringSchedulingIgnoredDuringExecution")
for i, term := range n.PreferredDuringSchedulingIgnoredDuringExecution {
warnings = append(warnings, nodeapi.GetWarningsForNodeSelectorTerm(term.Preference, true, preferredFldPath.Index(i).Child("preference"))...)
}
}
for i, t := range podSpec.TopologySpreadConstraints {
if msg, deprecated := nodeapi.GetNodeLabelDeprecatedMessage(t.TopologyKey); deprecated {
warnings = append(warnings, fmt.Sprintf(
"%s: %s is %s",
fieldPath.Child("spec", "topologySpreadConstraints").Index(i).Child("topologyKey"),
t.TopologyKey,
msg,
))
}
// warn if labelSelector is empty which is no-match.
if t.LabelSelector == nil {
warnings = append(warnings, fmt.Sprintf("%s: a null labelSelector results in matching no pod", fieldPath.Child("spec", "topologySpreadConstraints").Index(i).Child("labelSelector")))
}
}
// use of deprecated annotations
for _, deprecated := range deprecatedAnnotations {
if _, exists := meta.Annotations[deprecated.key]; exists {
warnings = append(warnings, fmt.Sprintf("%s: %s", fieldPath.Child("metadata", "annotations").Key(deprecated.key), deprecated.message))
}
if len(deprecated.prefix) > 0 {
for k := range meta.Annotations {
if strings.HasPrefix(k, deprecated.prefix) {
warnings = append(warnings, fmt.Sprintf("%s: %s", fieldPath.Child("metadata", "annotations").Key(k), deprecated.message))
break
}
}
}
}
// deprecated and removed volume plugins
for i, v := range podSpec.Volumes {
if v.PhotonPersistentDisk != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.11, non-functional in v1.16+", fieldPath.Child("spec", "volumes").Index(i).Child("photonPersistentDisk")))
}
if v.GitRepo != nil {
if !utilfeature.DefaultFeatureGate.Enabled(features.GitRepoVolumeDriver) {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.11, and disabled by default in v1.33+", fieldPath.Child("spec", "volumes").Index(i).Child("gitRepo")))
} else {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.11", fieldPath.Child("spec", "volumes").Index(i).Child("gitRepo")))
}
}
if v.ScaleIO != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.16, non-functional in v1.22+", fieldPath.Child("spec", "volumes").Index(i).Child("scaleIO")))
}
if v.Flocker != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.22, non-functional in v1.25+", fieldPath.Child("spec", "volumes").Index(i).Child("flocker")))
}
if v.StorageOS != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.22, non-functional in v1.25+", fieldPath.Child("spec", "volumes").Index(i).Child("storageOS")))
}
if v.Quobyte != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.22, non-functional in v1.25+", fieldPath.Child("spec", "volumes").Index(i).Child("quobyte")))
}
if v.Glusterfs != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.25, non-functional in v1.26+", fieldPath.Child("spec", "volumes").Index(i).Child("glusterfs")))
}
if v.Ephemeral != nil && v.Ephemeral.VolumeClaimTemplate != nil {
warnings = append(warnings, pvcutil.GetWarningsForPersistentVolumeClaimSpec(fieldPath.Child("spec", "volumes").Index(i).Child("ephemeral").Child("volumeClaimTemplate").Child("spec"), v.Ephemeral.VolumeClaimTemplate.Spec)...)
}
if v.CephFS != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.28, non-functional in v1.31+", fieldPath.Child("spec", "volumes").Index(i).Child("cephfs")))
}
if v.RBD != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.28, non-functional in v1.31+", fieldPath.Child("spec", "volumes").Index(i).Child("rbd")))
}
}
if overlaps := warningsForOverlappingVirtualPaths(podSpec.Volumes); len(overlaps) > 0 {
warnings = append(warnings, overlaps...)
}
// duplicate hostAliases (#91670, #58477)
if len(podSpec.HostAliases) > 1 {
items := sets.New[string]()
for i, item := range podSpec.HostAliases {
if items.Has(item.IP) {
warnings = append(warnings, fmt.Sprintf("%s: duplicate ip %q", fieldPath.Child("spec", "hostAliases").Index(i).Child("ip"), item.IP))
} else {
items.Insert(item.IP)
}
}
}
// duplicate imagePullSecrets (#91629, #58477)
if len(podSpec.ImagePullSecrets) > 1 {
items := sets.New[string]()
for i, item := range podSpec.ImagePullSecrets {
if items.Has(item.Name) {
warnings = append(warnings, fmt.Sprintf("%s: duplicate name %q", fieldPath.Child("spec", "imagePullSecrets").Index(i).Child("name"), item.Name))
} else {
items.Insert(item.Name)
}
}
}
// imagePullSecrets with empty name (#99454#issuecomment-787838112)
for i, item := range podSpec.ImagePullSecrets {
if len(item.Name) == 0 {
warnings = append(warnings, fmt.Sprintf("%s: invalid empty name %q", fieldPath.Child("spec", "imagePullSecrets").Index(i).Child("name"), item.Name))
}
}
// fractional memory/ephemeral-storage requests/limits (#79950, #49442, #18538)
if value, ok := podSpec.Overhead[api.ResourceMemory]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", fieldPath.Child("spec", "overhead").Key(string(api.ResourceMemory)), value.String()))
}
if value, ok := podSpec.Overhead[api.ResourceEphemeralStorage]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", fieldPath.Child("spec", "overhead").Key(string(api.ResourceEphemeralStorage)), value.String()))
}
// use of pod seccomp annotation without accompanying field
if podSpec.SecurityContext == nil || podSpec.SecurityContext.SeccompProfile == nil {
if _, exists := meta.Annotations[api.SeccompPodAnnotationKey]; exists {
warnings = append(warnings, fmt.Sprintf(`%s: non-functional in v1.27+; use the "seccompProfile" field instead`, fieldPath.Child("metadata", "annotations").Key(api.SeccompPodAnnotationKey)))
}
}
var podAppArmorProfile *api.AppArmorProfile
if podSpec.SecurityContext != nil {
podAppArmorProfile = podSpec.SecurityContext.AppArmorProfile
}
pods.VisitContainersWithPath(podSpec, fieldPath.Child("spec"), func(c *api.Container, p *field.Path) bool {
// use of container seccomp annotation without accompanying field
if c.SecurityContext == nil || c.SecurityContext.SeccompProfile == nil {
if _, exists := meta.Annotations[api.SeccompContainerAnnotationKeyPrefix+c.Name]; exists {
warnings = append(warnings, fmt.Sprintf(`%s: non-functional in v1.27+; use the "seccompProfile" field instead`, fieldPath.Child("metadata", "annotations").Key(api.SeccompContainerAnnotationKeyPrefix+c.Name)))
}
}
// use of container AppArmor annotation without accompanying field
isPodTemplate := fieldPath != nil // Pod warnings are emitted through applyAppArmorVersionSkew instead.
hasAppArmorField := c.SecurityContext != nil && c.SecurityContext.AppArmorProfile != nil
if isPodTemplate && !hasAppArmorField {
key := api.DeprecatedAppArmorAnnotationKeyPrefix + c.Name
if annotation, exists := meta.Annotations[key]; exists {
// Only warn if the annotation doesn't match the pod profile.
if podAppArmorProfile == nil || !apiequality.Semantic.DeepEqual(podAppArmorProfile, ApparmorFieldForAnnotation(annotation)) {
warnings = append(warnings, fmt.Sprintf(`%s: deprecated since v1.30; use the "appArmorProfile" field instead`, fieldPath.Child("metadata", "annotations").Key(key)))
}
}
}
// fractional memory/ephemeral-storage requests/limits (#79950, #49442, #18538)
if value, ok := c.Resources.Limits[api.ResourceMemory]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "limits").Key(string(api.ResourceMemory)), value.String()))
}
if value, ok := c.Resources.Requests[api.ResourceMemory]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "requests").Key(string(api.ResourceMemory)), value.String()))
}
if value, ok := c.Resources.Limits[api.ResourceEphemeralStorage]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "limits").Key(string(api.ResourceEphemeralStorage)), value.String()))
}
if value, ok := c.Resources.Requests[api.ResourceEphemeralStorage]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "requests").Key(string(api.ResourceEphemeralStorage)), value.String()))
}
// duplicate containers[*].env (#86163, #93266, #58477)
if len(c.Env) > 1 {
items := sets.New[string]()
for i, item := range c.Env {
if items.Has(item.Name) {
// a previous value exists, but it might be OK
bad := false
ref := fmt.Sprintf("$(%s)", item.Name) // what does a ref to this name look like
// if we are replacing it with a valueFrom, warn
if item.ValueFrom != nil {
bad = true
}
// if this is X="$(X)", warn
if item.Value == ref {
bad = true
}
// if the new value does not contain a reference to the old
// value (e.g. X="abc"; X="$(X)123"), warn
if !strings.Contains(item.Value, ref) {
bad = true
}
if bad {
warnings = append(warnings, fmt.Sprintf("%s: hides previous definition of %q, which may be dropped when using apply", p.Child("env").Index(i), item.Name))
}
} else {
items.Insert(item.Name)
}
}
}
return true
})
type portBlock struct {
field *field.Path
port api.ContainerPort
}
// Accumulate ports across all containers
allPorts := map[string][]portBlock{}
pods.VisitContainersWithPath(podSpec, fieldPath.Child("spec"), func(c *api.Container, fldPath *field.Path) bool {
for i, port := range c.Ports {
if port.HostIP != "" && port.HostPort == 0 {
warnings = append(warnings, fmt.Sprintf("%s: hostIP set without hostPort: %+v",
fldPath.Child("ports").Index(i), port))
}
k := fmt.Sprintf("%d/%s", port.ContainerPort, port.Protocol)
if others, found := allPorts[k]; found {
// Someone else has this protcol+port, but it still might not be a conflict.
for _, other := range others {
if port.HostIP == other.port.HostIP && port.HostPort == other.port.HostPort {
// Exactly-equal is obvious. Validation should already filter for this except when these are unspecified.
warnings = append(warnings, fmt.Sprintf("%s: duplicate port definition with %s", fldPath.Child("ports").Index(i), other.field))
} else if port.HostPort == 0 || other.port.HostPort == 0 {
// HostPort = 0 is redundant with any other value, which is odd but not really dangerous. HostIP doesn't matter here.
warnings = append(warnings, fmt.Sprintf("%s: overlapping port definition with %s", fldPath.Child("ports").Index(i), other.field))
} else if a, b := port.HostIP == "", other.port.HostIP == ""; port.HostPort == other.port.HostPort && ((a || b) && !(a && b)) {
// If the HostPorts are the same and either HostIP is not specified while the other is not, the behavior is undefined.
warnings = append(warnings, fmt.Sprintf("%s: dangerously ambiguous port definition with %s", fldPath.Child("ports").Index(i), other.field))
}
}
allPorts[k] = append(allPorts[k], portBlock{field: fldPath.Child("ports").Index(i), port: port})
} else {
allPorts[k] = []portBlock{{field: fldPath.Child("ports").Index(i), port: port}}
}
}
return true
})
// Accumulate port names of containers and sidecar containers
allPortsNames := map[string]*field.Path{}
pods.VisitContainersWithPath(podSpec, fieldPath.Child("spec"), func(c *api.Container, fldPath *field.Path) bool {
for i, port := range c.Ports {
if port.Name != "" {
if other, found := allPortsNames[port.Name]; found {
warnings = append(warnings, fmt.Sprintf("%s: duplicate port name %q with %s, services and probes that select ports by name will use %s", fldPath.Child("ports").Index(i), port.Name, other, other))
} else {
allPortsNames[port.Name] = fldPath.Child("ports").Index(i)
}
}
}
return true
})
// warn if the terminationGracePeriodSeconds is negative.
if podSpec.TerminationGracePeriodSeconds != nil && *podSpec.TerminationGracePeriodSeconds < 0 {
warnings = append(warnings, fmt.Sprintf("%s: must be >= 0; negative values are invalid and will be treated as 1", fieldPath.Child("spec", "terminationGracePeriodSeconds")))
}
if podSpec.Affinity != nil {
if affinity := podSpec.Affinity.PodAffinity; affinity != nil {
warnings = append(warnings, warningsForPodAffinityTerms(affinity.RequiredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAffinity", "requiredDuringSchedulingIgnoredDuringExecution"))...)
warnings = append(warnings, warningsForWeightedPodAffinityTerms(affinity.PreferredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAffinity", "preferredDuringSchedulingIgnoredDuringExecution"))...)
}
if affinity := podSpec.Affinity.PodAntiAffinity; affinity != nil {
warnings = append(warnings, warningsForPodAffinityTerms(affinity.RequiredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAntiAffinity", "requiredDuringSchedulingIgnoredDuringExecution"))...)
warnings = append(warnings, warningsForWeightedPodAffinityTerms(affinity.PreferredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAntiAffinity", "preferredDuringSchedulingIgnoredDuringExecution"))...)
}
}
// Deprecated IP address formats
if podSpec.DNSConfig != nil {
for i, ns := range podSpec.DNSConfig.Nameservers {
warnings = append(warnings, validation.GetWarningsForIP(fieldPath.Child("spec", "dnsConfig", "nameservers").Index(i), ns)...)
}
}
for i, hostAlias := range podSpec.HostAliases {
warnings = append(warnings, validation.GetWarningsForIP(fieldPath.Child("spec", "hostAliases").Index(i).Child("ip"), hostAlias.IP)...)
}
return warnings
}
func warningsForPodAffinityTerms(terms []api.PodAffinityTerm, fieldPath *field.Path) []string {
var warnings []string
for i, t := range terms {
if t.LabelSelector == nil {
warnings = append(warnings, fmt.Sprintf("%s: a null labelSelector results in matching no pod", fieldPath.Index(i).Child("labelSelector")))
}
}
return warnings
}
func warningsForWeightedPodAffinityTerms(terms []api.WeightedPodAffinityTerm, fieldPath *field.Path) []string {
var warnings []string
for i, t := range terms {
// warn if labelSelector is empty which is no-match.
if t.PodAffinityTerm.LabelSelector == nil {
warnings = append(warnings, fmt.Sprintf("%s: a null labelSelector results in matching no pod", fieldPath.Index(i).Child("podAffinityTerm", "labelSelector")))
}
}
return warnings
}
// warningsForOverlappingVirtualPaths validates that there are no overlapping paths in single ConfigMapVolume, SecretVolume, DownwardAPIVolume and ProjectedVolume.
// A volume can try to load different keys to the same path which will result in overwriting of the value from the latest registered key
// Another possible scenario is when one of the path contains the other key path. Example:
// configMap:
//
// name: myconfig
// items:
// - key: key1
// path: path
// - key: key2
// path: path/path2
//
// In such cases we either get `is directory` or 'file exists' error message.
func warningsForOverlappingVirtualPaths(volumes []api.Volume) []string {
var warnings []string
mkWarn := func(volName, volDesc, body string) string {
return fmt.Sprintf("volume %q (%s): overlapping paths: %s", volName, volDesc, body)
}
for _, v := range volumes {
if v.ConfigMap != nil && v.ConfigMap.Items != nil {
overlaps := checkVolumeMappingForOverlap(extractPaths(v.ConfigMap.Items, ""))
for _, ol := range overlaps {
warnings = append(warnings, mkWarn(v.Name, fmt.Sprintf("ConfigMap %q", v.ConfigMap.Name), ol))
}
}
if v.Secret != nil && v.Secret.Items != nil {
overlaps := checkVolumeMappingForOverlap(extractPaths(v.Secret.Items, ""))
for _, ol := range overlaps {
warnings = append(warnings, mkWarn(v.Name, fmt.Sprintf("Secret %q", v.Secret.SecretName), ol))
}
}
if v.DownwardAPI != nil && v.DownwardAPI.Items != nil {
overlaps := checkVolumeMappingForOverlap(extractPathsDownwardAPI(v.DownwardAPI.Items, ""))
for _, ol := range overlaps {
warnings = append(warnings, mkWarn(v.Name, "DownwardAPI", ol))
}
}
if v.Projected != nil {
var allPaths []pathAndSource
for _, source := range v.Projected.Sources {
if source == (api.VolumeProjection{}) {
warnings = append(warnings, fmt.Sprintf("volume %q (Projected) has no sources provided", v.Name))
continue
}
var sourcePaths []pathAndSource
switch {
case source.ConfigMap != nil && source.ConfigMap.Items != nil:
sourcePaths = extractPaths(source.ConfigMap.Items, fmt.Sprintf("ConfigMap %q", source.ConfigMap.Name))
case source.Secret != nil && source.Secret.Items != nil:
sourcePaths = extractPaths(source.Secret.Items, fmt.Sprintf("Secret %q", source.Secret.Name))
case source.DownwardAPI != nil && source.DownwardAPI.Items != nil:
sourcePaths = extractPathsDownwardAPI(source.DownwardAPI.Items, "DownwardAPI")
case source.ServiceAccountToken != nil:
sourcePaths = []pathAndSource{{source.ServiceAccountToken.Path, "ServiceAccountToken"}}
case source.ClusterTrustBundle != nil:
name := ""
if source.ClusterTrustBundle.Name != nil {
name = *source.ClusterTrustBundle.Name
} else {
name = *source.ClusterTrustBundle.SignerName
}
sourcePaths = []pathAndSource{{source.ClusterTrustBundle.Path, fmt.Sprintf("ClusterTrustBundle %q", name)}}
case source.PodCertificate != nil:
sourcePaths = []pathAndSource{}
if len(source.PodCertificate.CertificateChainPath) != 0 {
sourcePaths = append(sourcePaths, pathAndSource{source.PodCertificate.CertificateChainPath, "PodCertificate chain"})
}
if len(source.PodCertificate.KeyPath) != 0 {
sourcePaths = append(sourcePaths, pathAndSource{source.PodCertificate.KeyPath, "PodCertificate key"})
}
if len(source.PodCertificate.CredentialBundlePath) != 0 {
sourcePaths = append(sourcePaths, pathAndSource{source.PodCertificate.CredentialBundlePath, "PodCertificate credential bundle"})
}
}
if len(sourcePaths) == 0 {
continue
}
for _, ps := range sourcePaths {
ps.path = strings.TrimRight(ps.path, string(os.PathSeparator))
if collisions := checkForOverlap(allPaths, ps); len(collisions) > 0 {
for _, c := range collisions {
warnings = append(warnings, mkWarn(v.Name, "Projected", fmt.Sprintf("%s with %s", ps.String(), c.String())))
}
}
allPaths = append(allPaths, ps)
}
}
}
}
return warnings
}
// this lets us track a path and where it came from, for better errors
type pathAndSource struct {
path string
source string
}
func (ps pathAndSource) String() string {
if ps.source != "" {
return fmt.Sprintf("%q (%s)", ps.path, ps.source)
}
return fmt.Sprintf("%q", ps.path)
}
func extractPaths(mapping []api.KeyToPath, source string) []pathAndSource {
result := make([]pathAndSource, 0, len(mapping))
for _, v := range mapping {
result = append(result, pathAndSource{v.Path, source})
}
return result
}
func extractPathsDownwardAPI(mapping []api.DownwardAPIVolumeFile, source string) []pathAndSource {
result := make([]pathAndSource, 0, len(mapping))
for _, v := range mapping {
result = append(result, pathAndSource{v.Path, source})
}
return result
}
func checkVolumeMappingForOverlap(paths []pathAndSource) []string {
pathSeparator := string(os.PathSeparator)
var warnings []string
var allPaths []pathAndSource
for _, ps := range paths {
ps.path = strings.TrimRight(ps.path, pathSeparator)
if collisions := checkForOverlap(allPaths, ps); len(collisions) > 0 {
for _, c := range collisions {
warnings = append(warnings, fmt.Sprintf("%s with %s", ps.String(), c.String()))
}
}
allPaths = append(allPaths, ps)
}
return warnings
}
func checkForOverlap(haystack []pathAndSource, needle pathAndSource) []pathAndSource {
pathSeparator := `/` // this check runs in the API server, use the OS-agnostic separator
if needle.path == "" {
return nil
}
var result []pathAndSource
for _, item := range haystack {
switch {
case item.path == "":
continue
case item == needle:
result = append(result, item)
case strings.HasPrefix(item.path+pathSeparator, needle.path+pathSeparator):
result = append(result, item)
case strings.HasPrefix(needle.path+pathSeparator, item.path+pathSeparator):
result = append(result, item)
}
}
return result
}
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