mirror of https://github.com/k3s-io/k3s
64 lines
2.2 KiB
Go
64 lines
2.2 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 devicemapper
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import (
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"os/exec"
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"strconv"
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"strings"
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"k8s.io/klog"
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)
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// DmsetupClient is a low-level client for interacting with device mapper via
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// the `dmsetup` utility, which is provided by the `device-mapper` package.
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type DmsetupClient interface {
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// Table runs `dmsetup table` on the given device name and returns the
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// output or an error.
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Table(deviceName string) ([]byte, error)
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// Message runs `dmsetup message` on the given device, passing the given
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// message to the given sector, and returns the output or an error.
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Message(deviceName string, sector int, message string) ([]byte, error)
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// Status runs `dmsetup status` on the given device and returns the output
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// or an error.
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Status(deviceName string) ([]byte, error)
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}
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// NewDmSetupClient returns a new DmsetupClient.
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func NewDmsetupClient() DmsetupClient {
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return &defaultDmsetupClient{}
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}
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// defaultDmsetupClient is a functional DmsetupClient
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type defaultDmsetupClient struct{}
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var _ DmsetupClient = &defaultDmsetupClient{}
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func (c *defaultDmsetupClient) Table(deviceName string) ([]byte, error) {
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return c.dmsetup("table", deviceName)
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}
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func (c *defaultDmsetupClient) Message(deviceName string, sector int, message string) ([]byte, error) {
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return c.dmsetup("message", deviceName, strconv.Itoa(sector), message)
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}
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func (c *defaultDmsetupClient) Status(deviceName string) ([]byte, error) {
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return c.dmsetup("status", deviceName)
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}
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func (*defaultDmsetupClient) dmsetup(args ...string) ([]byte, error) {
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klog.V(5).Infof("running dmsetup %v", strings.Join(args, " "))
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return exec.Command("dmsetup", args...).Output()
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}
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