-
Notifications
You must be signed in to change notification settings - Fork 250
/
qemu.go
245 lines (210 loc) · 7.71 KB
/
qemu.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
/*
Copyright 2018 The CDI Authors.
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 image
import (
"encoding/json"
"fmt"
"net/url"
"os"
"regexp"
"strconv"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/klog"
"kubevirt.io/containerized-data-importer/pkg/common"
"kubevirt.io/containerized-data-importer/pkg/system"
"kubevirt.io/containerized-data-importer/pkg/util"
)
const (
networkTimeoutSecs = 3600 //max is 10000
maxMemory = 1 << 30 //value from OpenStack Nova
maxCPUSecs = 30 //value from OpenStack Nova
matcherString = "\\((\\d?\\d\\.\\d\\d)\\/100%\\)"
)
// ImgInfo contains the virtual image information.
type ImgInfo struct {
// Format contains the format of the image
Format string `json:"format"`
// BackingFile is the file name of the backing file
BackingFile string `json:"backing-filename"`
// VirtualSize is the disk size of the image which will be read by vm
VirtualSize int64 `json:"virtual-size"`
// ActualSize is the size of the qcow2 image
ActualSize int64 `json:"actual-size"`
}
// QEMUOperations defines the interface for executing qemu subprocesses
type QEMUOperations interface {
ConvertToRawStream(*url.URL, string) error
Resize(string, resource.Quantity) error
Info(url *url.URL) (*ImgInfo, error)
Validate(*url.URL, int64) error
CreateBlankImage(string, resource.Quantity) error
}
type qemuOperations struct{}
var (
qemuExecFunction = system.ExecWithLimits
qemuInfoLimits = &system.ProcessLimitValues{AddressSpaceLimit: maxMemory, CPUTimeLimit: maxCPUSecs}
qemuIterface = NewQEMUOperations()
re = regexp.MustCompile(matcherString)
progress = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "import_progress",
Help: "The import progress in percentage",
},
[]string{"ownerUID"},
)
ownerUID string
)
func init() {
if err := prometheus.Register(progress); err != nil {
if are, ok := err.(prometheus.AlreadyRegisteredError); ok {
// A counter for that metric has been registered before.
// Use the old counter from now on.
progress = are.ExistingCollector.(*prometheus.CounterVec)
} else {
klog.Errorf("Unable to create prometheus progress counter")
}
}
ownerUID, _ = util.ParseEnvVar(common.OwnerUID, false)
}
// NewQEMUOperations returns the default implementation of QEMUOperations
func NewQEMUOperations() QEMUOperations {
return &qemuOperations{}
}
func convertToRaw(src, dest string) error {
_, err := qemuExecFunction(nil, nil, "qemu-img", "convert", "-t", "none", "-p", "-O", "raw", src, dest)
if err != nil {
os.Remove(dest)
return errors.Wrap(err, "could not convert image to raw")
}
return nil
}
func (o *qemuOperations) ConvertToRawStream(url *url.URL, dest string) error {
if len(url.Scheme) == 0 {
// File, instead of URL
return convertToRaw(url.String(), dest)
}
jsonArg := fmt.Sprintf("json: {\"file.driver\": \"%s\", \"file.url\": \"%s\", \"file.timeout\": %d}", url.Scheme, url, networkTimeoutSecs)
_, err := qemuExecFunction(nil, reportProgress, "qemu-img", "convert", "-t", "none", "-p", "-O", "raw", jsonArg, dest)
if err != nil {
// TODO: Determine what to do here, the conversion failed, and we need to clean up the mess, but we could be writing to a block device
os.Remove(dest)
return errors.Wrap(err, "could not stream/convert image to raw")
}
return nil
}
// convertQuantityToQemuSize translates a quantity string into a Qemu compatible string.
func convertQuantityToQemuSize(size resource.Quantity) string {
int64Size, asInt := size.AsInt64()
if !asInt {
size.AsDec().SetScale(0)
return size.AsDec().String()
}
return strconv.FormatInt(int64Size, 10)
}
func (o *qemuOperations) Resize(image string, size resource.Quantity) error {
_, err := qemuExecFunction(nil, nil, "qemu-img", "resize", "-f", "raw", image, convertQuantityToQemuSize(size))
if err != nil {
return errors.Wrapf(err, "Error resizing image %s", image)
}
return nil
}
func (o *qemuOperations) Info(url *url.URL) (*ImgInfo, error) {
var output []byte
var err error
if len(url.Scheme) > 0 {
// Image is a URL, make sure the timeout is long enough.
jsonArg := fmt.Sprintf("json: {\"file.driver\": \"%s\", \"file.url\": \"%s\", \"file.timeout\": %d}", url.Scheme, url, networkTimeoutSecs)
output, err = qemuExecFunction(qemuInfoLimits, nil, "qemu-img", "info", "--output=json", jsonArg)
} else {
output, err = qemuExecFunction(qemuInfoLimits, nil, "qemu-img", "info", "--output=json", url.String())
}
if err != nil {
return nil, errors.Errorf("%s, %s", output, err.Error())
}
var info ImgInfo
err = json.Unmarshal(output, &info)
if err != nil {
klog.Errorf("Invalid JSON:\n%s\n", string(output))
return nil, errors.Wrapf(err, "Invalid json for image %s", url.String())
}
return &info, nil
}
func isSupportedFormat(value string) bool {
switch value {
case "raw", "qcow2":
return true
default:
return false
}
}
func (o *qemuOperations) Validate(url *url.URL, availableSize int64) error {
info, err := o.Info(url)
if err != nil {
return err
}
if !isSupportedFormat(info.Format) {
return errors.Errorf("Invalid format %s for image %s", info.Format, url.String())
}
if len(info.BackingFile) > 0 {
return errors.Errorf("Image %s is invalid because it has backing file %s", url.String(), info.BackingFile)
}
if availableSize < info.VirtualSize {
return errors.Errorf("Virtual image size %d is larger than available size %d. A larger PVC is required.", info.VirtualSize, availableSize)
}
return nil
}
// ConvertToRawStream converts an http accessible image to raw format without locally caching the image
func ConvertToRawStream(url *url.URL, dest string) error {
return qemuIterface.ConvertToRawStream(url, dest)
}
// Validate does basic validation of a qemu image
func Validate(url *url.URL, availableSize int64) error {
return qemuIterface.Validate(url, availableSize)
}
func reportProgress(line string) {
// (45.34/100%)
matches := re.FindStringSubmatch(line)
if len(matches) == 2 && ownerUID != "" {
klog.V(1).Info(matches[1])
// Don't need to check for an error, the regex made sure its a number we can parse.
v, _ := strconv.ParseFloat(matches[1], 64)
metric := &dto.Metric{}
err := progress.WithLabelValues(ownerUID).Write(metric)
if err == nil && v > 0 && v > *metric.Counter.Value {
progress.WithLabelValues(ownerUID).Add(v - *metric.Counter.Value)
}
}
}
// CreateBlankImage creates empty raw image
func CreateBlankImage(dest string, size resource.Quantity) error {
klog.V(1).Infof("creating raw image with size %s", size.String())
return qemuIterface.CreateBlankImage(dest, size)
}
// CreateBlankImage creates a raw image with a given size
func (o *qemuOperations) CreateBlankImage(dest string, size resource.Quantity) error {
klog.V(3).Infof("image size is %s", size.String())
_, err := qemuExecFunction(nil, nil, "qemu-img", "create", "-f", "raw", dest, convertQuantityToQemuSize(size))
if err != nil {
os.Remove(dest)
return errors.Wrap(err, fmt.Sprintf("could not create raw image with size %s in %s", size.String(), dest))
}
// Change permissions to 0660
err = os.Chmod(dest, 0660)
if err != nil {
err = errors.Wrap(err, "Unable to change permissions of target file")
}
return nil
}