64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sysctl
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import (
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"strings"
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"k8s.io/api/core/v1"
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)
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// convertSysctlVariableToDotsSeparator can return sysctl variables in dots separator format.
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// The '/' separator is also accepted in place of a '.'.
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// Convert the sysctl variables to dots separator format for validation.
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// More info:
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// https://man7.org/linux/man-pages/man8/sysctl.8.html
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// https://man7.org/linux/man-pages/man5/sysctl.d.5.html
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func convertSysctlVariableToDotsSeparator(val string) string {
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if val == "" {
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return val
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}
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firstSepIndex := strings.IndexAny(val, "./")
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if firstSepIndex == -1 || val[firstSepIndex] == '.' {
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return val
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}
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f := func(r rune) rune {
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switch r {
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case '.':
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return '/'
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case '/':
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return '.'
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}
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return r
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}
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return strings.Map(f, val)
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}
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// ConvertPodSysctlsVariableToDotsSeparator converts sysctls variable in the Pod.Spec.SecurityContext.Sysctls slice into a dot as a separator
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// according to the linux sysctl conversion rules.
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// see https://man7.org/linux/man-pages/man5/sysctl.d.5.html for more details.
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func ConvertPodSysctlsVariableToDotsSeparator(securityContext *v1.PodSecurityContext) {
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if securityContext == nil {
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return
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}
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for i, sysctl := range securityContext.Sysctls {
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securityContext.Sysctls[i].Name = convertSysctlVariableToDotsSeparator(sysctl.Name)
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}
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return
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}
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