mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-17 05:48:21 +00:00
61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
/*
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Copyright 2020 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 rules
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import (
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"fmt"
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"io/ioutil"
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"strings"
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)
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// LoadedKModRule matches loaded kernel modules in the system
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type LoadedKModRule []string
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const kmodProcfsPath = "/proc/modules"
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// Match loaded kernel modules on provided list of kernel modules
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func (kmods *LoadedKModRule) Match() (bool, error) {
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loadedModules, err := kmods.getLoadedModules()
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if err != nil {
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return false, fmt.Errorf("failed to get loaded kernel modules. %s", err.Error())
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}
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for _, kmod := range *kmods {
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if _, ok := loadedModules[kmod]; !ok {
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// kernel module not loaded
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return false, nil
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}
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}
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return true, nil
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}
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func (kmods *LoadedKModRule) getLoadedModules() (map[string]struct{}, error) {
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out, err := ioutil.ReadFile(kmodProcfsPath)
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if err != nil {
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return nil, fmt.Errorf("failed to read file %s: %s", kmodProcfsPath, err.Error())
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}
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loadedMods := make(map[string]struct{})
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for _, line := range strings.Split(string(out), "\n") {
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// skip empty lines
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if len(line) == 0 {
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continue
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}
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// append loaded module
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loadedMods[strings.Fields(line)[0]] = struct{}{}
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}
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return loadedMods, nil
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}
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