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// Copyright 2016 CoreOS, Inc.
//
// 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 (
"os"
"path/filepath"
)
const deviceAliasDir = "/dev_aliases"
// DeviceAlias returns the aliased form of the supplied path.
// Note device paths in ignition are always absolute.
func DeviceAlias(path string) string {
return filepath.Join(deviceAliasDir, filepath.Clean(path))
}
// CreateDeviceAlias creates a device alias for the supplied path.
// On success the canonicalized path used as the alias target is returned.
func CreateDeviceAlias(path string) (string, error) {
target, err := filepath.EvalSymlinks(path)
if err != nil {
return "", err
}
alias := DeviceAlias(path)
if err := os.Remove(alias); err != nil {
if !os.IsNotExist(err) {
return "", err
}
if err = os.MkdirAll(filepath.Dir(alias), 0750); err != nil {
return "", err
}
}
if err = os.Symlink(target, alias); err != nil {
return "", err
}
return target, nil
}
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