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
|
package computestorage
import (
"context"
"os"
"path/filepath"
"syscall"
"github.com/Microsoft/go-winio/pkg/security"
"github.com/Microsoft/go-winio/vhd"
"github.com/pkg/errors"
"golang.org/x/sys/windows"
)
const defaultVHDXBlockSizeInMB = 1
// SetupContainerBaseLayer is a helper to setup a containers scratch. It
// will create and format the vhdx's inside and the size is configurable with the sizeInGB
// parameter.
//
// `layerPath` is the path to the base container layer on disk.
//
// `baseVhdPath` is the path to where the base vhdx for the base layer should be created.
//
// `diffVhdPath` is the path where the differencing disk for the base layer should be created.
//
// `sizeInGB` is the size in gigabytes to make the base vhdx.
func SetupContainerBaseLayer(ctx context.Context, layerPath, baseVhdPath, diffVhdPath string, sizeInGB uint64) (err error) {
var (
hivesPath = filepath.Join(layerPath, "Hives")
layoutPath = filepath.Join(layerPath, "Layout")
)
// We need to remove the hives directory and layout file as `SetupBaseOSLayer` fails if these files
// already exist. `SetupBaseOSLayer` will create these files internally. We also remove the base and
// differencing disks if they exist in case we're asking for a different size.
if _, err := os.Stat(hivesPath); err == nil {
if err := os.RemoveAll(hivesPath); err != nil {
return errors.Wrap(err, "failed to remove prexisting hives directory")
}
}
if _, err := os.Stat(layoutPath); err == nil {
if err := os.RemoveAll(layoutPath); err != nil {
return errors.Wrap(err, "failed to remove prexisting layout file")
}
}
if _, err := os.Stat(baseVhdPath); err == nil {
if err := os.RemoveAll(baseVhdPath); err != nil {
return errors.Wrap(err, "failed to remove base vhdx path")
}
}
if _, err := os.Stat(diffVhdPath); err == nil {
if err := os.RemoveAll(diffVhdPath); err != nil {
return errors.Wrap(err, "failed to remove differencing vhdx")
}
}
createParams := &vhd.CreateVirtualDiskParameters{
Version: 2,
Version2: vhd.CreateVersion2{
MaximumSize: sizeInGB * 1024 * 1024 * 1024,
BlockSizeInBytes: defaultVHDXBlockSizeInMB * 1024 * 1024,
},
}
handle, err := vhd.CreateVirtualDisk(baseVhdPath, vhd.VirtualDiskAccessNone, vhd.CreateVirtualDiskFlagNone, createParams)
if err != nil {
return errors.Wrap(err, "failed to create vhdx")
}
defer func() {
if err != nil {
_ = syscall.CloseHandle(handle)
os.RemoveAll(baseVhdPath)
os.RemoveAll(diffVhdPath)
}
}()
if err = FormatWritableLayerVhd(ctx, windows.Handle(handle)); err != nil {
return err
}
// Base vhd handle must be closed before calling SetupBaseLayer in case of Container layer
if err = syscall.CloseHandle(handle); err != nil {
return errors.Wrap(err, "failed to close vhdx handle")
}
options := OsLayerOptions{
Type: OsLayerTypeContainer,
}
// SetupBaseOSLayer expects an empty vhd handle for a container layer and will
// error out otherwise.
if err = SetupBaseOSLayer(ctx, layerPath, 0, options); err != nil {
return err
}
// Create the differencing disk that will be what's copied for the final rw layer
// for a container.
if err = vhd.CreateDiffVhd(diffVhdPath, baseVhdPath, defaultVHDXBlockSizeInMB); err != nil {
return errors.Wrap(err, "failed to create differencing disk")
}
if err = security.GrantVmGroupAccess(baseVhdPath); err != nil {
return errors.Wrapf(err, "failed to grant vm group access to %s", baseVhdPath)
}
if err = security.GrantVmGroupAccess(diffVhdPath); err != nil {
return errors.Wrapf(err, "failed to grant vm group access to %s", diffVhdPath)
}
return nil
}
// SetupUtilityVMBaseLayer is a helper to setup a UVMs scratch space. It will create and format
// the vhdx inside and the size is configurable by the sizeInGB parameter.
//
// `uvmPath` is the path to the UtilityVM filesystem.
//
// `baseVhdPath` is the path to where the base vhdx for the UVM should be created.
//
// `diffVhdPath` is the path where the differencing disk for the UVM should be created.
//
// `sizeInGB` specifies the size in gigabytes to make the base vhdx.
func SetupUtilityVMBaseLayer(ctx context.Context, uvmPath, baseVhdPath, diffVhdPath string, sizeInGB uint64) (err error) {
// Remove the base and differencing disks if they exist in case we're asking for a different size.
if _, err := os.Stat(baseVhdPath); err == nil {
if err := os.RemoveAll(baseVhdPath); err != nil {
return errors.Wrap(err, "failed to remove base vhdx")
}
}
if _, err := os.Stat(diffVhdPath); err == nil {
if err := os.RemoveAll(diffVhdPath); err != nil {
return errors.Wrap(err, "failed to remove differencing vhdx")
}
}
// Just create the vhdx for utilityVM layer, no need to format it.
createParams := &vhd.CreateVirtualDiskParameters{
Version: 2,
Version2: vhd.CreateVersion2{
MaximumSize: sizeInGB * 1024 * 1024 * 1024,
BlockSizeInBytes: defaultVHDXBlockSizeInMB * 1024 * 1024,
},
}
handle, err := vhd.CreateVirtualDisk(baseVhdPath, vhd.VirtualDiskAccessNone, vhd.CreateVirtualDiskFlagNone, createParams)
if err != nil {
return errors.Wrap(err, "failed to create vhdx")
}
defer func() {
if err != nil {
_ = syscall.CloseHandle(handle)
os.RemoveAll(baseVhdPath)
os.RemoveAll(diffVhdPath)
}
}()
// If it is a UtilityVM layer then the base vhdx must be attached when calling
// `SetupBaseOSLayer`
attachParams := &vhd.AttachVirtualDiskParameters{
Version: 2,
}
if err := vhd.AttachVirtualDisk(handle, vhd.AttachVirtualDiskFlagNone, attachParams); err != nil {
return errors.Wrapf(err, "failed to attach virtual disk")
}
options := OsLayerOptions{
Type: OsLayerTypeVM,
}
if err := SetupBaseOSLayer(ctx, uvmPath, windows.Handle(handle), options); err != nil {
return err
}
// Detach and close the handle after setting up the layer as we don't need the handle
// for anything else and we no longer need to be attached either.
if err = vhd.DetachVirtualDisk(handle); err != nil {
return errors.Wrap(err, "failed to detach vhdx")
}
if err = syscall.CloseHandle(handle); err != nil {
return errors.Wrap(err, "failed to close vhdx handle")
}
// Create the differencing disk that will be what's copied for the final rw layer
// for a container.
if err = vhd.CreateDiffVhd(diffVhdPath, baseVhdPath, defaultVHDXBlockSizeInMB); err != nil {
return errors.Wrap(err, "failed to create differencing disk")
}
if err := security.GrantVmGroupAccess(baseVhdPath); err != nil {
return errors.Wrapf(err, "failed to grant vm group access to %s", baseVhdPath)
}
if err := security.GrantVmGroupAccess(diffVhdPath); err != nil {
return errors.Wrapf(err, "failed to grant vm group access to %s", diffVhdPath)
}
return nil
}
|
