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modules.go
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modules.go
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// Copyright 2019 Authors of Cilium
//
// 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 modules
import (
"fmt"
"github.com/cilium/cilium/pkg/command/exec"
"github.com/cilium/cilium/pkg/defaults"
"github.com/cilium/cilium/pkg/set"
)
// ModulesManager is a manager which stores information about loaded modules
// and provides a search operation.
type ModulesManager struct {
modulesList []string
}
// Init initializes the internal modules information store of modules manager.
func (m *ModulesManager) Init() error {
modulesList, err := listModules()
if err != nil {
return err
}
m.modulesList = modulesList
return nil
}
// findModules checks whether the given kernel modules are loaded and also
// returns a slice with names of modules which are not loaded.
func (m *ModulesManager) findModules(expectedNames ...string) (bool, []string) {
return set.SliceSubsetOf(expectedNames, m.modulesList)
}
// FindOrLoadModules checks whether the given kernel modules are loaded and
// tries to load those which are not.
func (m *ModulesManager) FindOrLoadModules(expectedNames ...string) error {
found, diff := m.findModules(expectedNames...)
if found {
return nil
}
for _, unloadedModule := range diff {
if _, err := exec.WithTimeout(
defaults.ExecTimeout, moduleLoader(), unloadedModule).CombinedOutput(
nil, false); err != nil {
return fmt.Errorf("could not load module %s: %s",
unloadedModule, err)
}
}
return nil
}