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81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package docker
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import (
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"fmt"
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"os"
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"strings"
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dockertypes "github.com/docker/docker/api/types"
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)
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const (
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DockerInfoDriver = "Driver"
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DockerInfoDriverStatus = "DriverStatus"
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DriverStatusPoolName = "Pool Name"
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DriverStatusDataLoopFile = "Data loop file"
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DriverStatusMetadataFile = "Metadata file"
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DriverStatusParentDataset = "Parent Dataset"
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)
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func DriverStatusValue(status [][2]string, target string) string {
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for _, v := range status {
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if strings.EqualFold(v[0], target) {
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return v[1]
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}
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}
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return ""
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}
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func DockerThinPoolName(info dockertypes.Info) (string, error) {
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poolName := DriverStatusValue(info.DriverStatus, DriverStatusPoolName)
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if len(poolName) == 0 {
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return "", fmt.Errorf("Could not get devicemapper pool name")
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}
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return poolName, nil
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}
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func DockerMetadataDevice(info dockertypes.Info) (string, error) {
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metadataDevice := DriverStatusValue(info.DriverStatus, DriverStatusMetadataFile)
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if len(metadataDevice) != 0 {
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return metadataDevice, nil
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}
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poolName, err := DockerThinPoolName(info)
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if err != nil {
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return "", err
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}
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metadataDevice = fmt.Sprintf("/dev/mapper/%s_tmeta", poolName)
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if _, err := os.Stat(metadataDevice); err != nil {
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return "", err
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}
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return metadataDevice, nil
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}
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func DockerZfsFilesystem(info dockertypes.Info) (string, error) {
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filesystem := DriverStatusValue(info.DriverStatus, DriverStatusParentDataset)
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if len(filesystem) == 0 {
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return "", fmt.Errorf("Could not get zfs filesystem")
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}
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return filesystem, nil
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}
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