forked from rook/rook
60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
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/*
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Copyright 2017 The Rook Authors. All rights reserved.
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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 util
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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)
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const (
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RBDSysBusPathDefault = "/sys/bus/rbd"
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RBDDevicesDir = "devices"
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RBDDevicePathPrefix = "/dev/rbd"
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)
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// FindRBDMappedFile search for the mapped RBD volume and returns its device path
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func FindRBDMappedFile(imageName, poolName, sysBusDir string) (string, error) {
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sysBusDeviceDir := filepath.Join(sysBusDir, RBDDevicesDir)
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// if sysPath does not exist, no attachments has happened
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if _, err := os.Stat(sysBusDeviceDir); os.IsNotExist(err) {
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return "", nil
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}
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files, err := ioutil.ReadDir(sysBusDeviceDir)
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if err != nil {
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return "", fmt.Errorf("failed to read rbd device dir: %+v", err)
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}
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for _, idFile := range files {
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nameContent, err := ioutil.ReadFile(filepath.Join(sysBusDeviceDir, idFile.Name(), "name"))
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if err == nil && imageName == strings.TrimSpace(string(nameContent)) {
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// the image for the current rbd device matches, now try to match pool
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poolContent, err := ioutil.ReadFile(filepath.Join(sysBusDeviceDir, idFile.Name(), "pool"))
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if err == nil && poolName == strings.TrimSpace(string(poolContent)) {
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// match current device matches both image name and pool name, return the device
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return idFile.Name(), nil
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}
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}
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}
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return "", nil
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}
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