-
Notifications
You must be signed in to change notification settings - Fork 7
/
disk_image.js
171 lines (148 loc) · 4.72 KB
/
disk_image.js
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
var execFile = require('child_process').execFile;
var exec = require('child_process').exec;
var spawn = require('child_process').spawn;
var zfs = require('zfs').zfs;
var async = require('async');
var VMDK = require('vmdk');
var fs = require('fs');
/*
* Get DiskSection.Disk @populatedSize
* @ovf:capacity
* @ovf:capacityAllocationUnits
*
* 1. zfs create -V $capacity_in_bytes zones/$zvol
* 2. qemu-img convert -f vmdk -O host_device
* 3. zfs snapshot/send
* 4. zfs destroy
*/
function randstr() {
return Math.floor(Math.random() * 0xffffffff).toString(16);
}
var DiskImage = module.exports = function () {};
DiskImage.prototype.convertToZfsStream = function (opts, callback) {
var self = this;
opts.zpool = opts.zpool || 'zones';
if (!opts.inputFile) {
throw new Error('Missing option to DiskImage: inputFile');
}
if (!opts.outputFile) {
throw new Error('Missing option to DiskImage: outputFile');
}
if (!opts.format) {
throw new Error('No disk format specified');
}
if (['vmdk'].indexOf(opts.format) === -1) {
throw new Error('Unsupported disk format: ' + opts.format);
}
console.dir(opts);
this.capacityBytes = opts.capacityBytes;
this.zvolName = opts.zpool + '/convert-image-'+randstr();
this.zvolSnapshotName = this.zvolName + '@vmdk-img-convert';
this.zvolDskPath = '/dev/zvol/dsk/' + this.zvolName;
this.inputFile = opts.inputFile;
this.outputFile = opts.outputFile;
async.waterfall([
self.createZvol.bind(self),
self.vmdkToZvol.bind(self),
function (wf$callback) {
setTimeout(function () { wf$callback(); }, 5000);
},
self.snapshotZvol.bind(self),
self.zfsSendSnapshot.bind(self)
],
function (error) {
if (error) {
console.error(error);
}
console.log('All done!');
zfs.destroy(
this.zvolSnapshotName,
function () {
zfs.destroyAll(
self.zvolName,
function () {
if (callback) {
callback();
}
});
});
});
};
DiskImage.prototype.createZvol = function (callback) {
var self = this;
console.log('Creating zvol: ' + self.zvolName);
execFile(
'/usr/sbin/zfs',
[ 'create', '-V', self.capacityBytes, self.zvolName ],
{},
function (error, stdout, stderr) {
if (error) {
return callback(new Error(stderr.toString()));
}
return callback();
});
};
DiskImage.prototype.vmdkToZvol = function (callback) {
var self = this;
console.log('Converting zvol.');
var outputStream;
var v = new VMDK({ filename: self.inputFile });
async.waterfall([
function (wf$callback) {
outputStream = fs.createWriteStream(self.zvolDskPath);
return wf$callback();
},
function (wf$callback) {
v.open(function (error) {
console.log('opened the file %s', self.zvolDskPath);
console.dir(error);
console.dir(v.header);
var stream = v.stream();
stream.pipe(outputStream);
stream.on('error', function (stream$error) {
console.warn(
'Error streaming vmdk: %s', stream$error.message);
});
stream.on('end', function (data) {
console.warn('VMDK Stream ended');
outputStream.end();
return wf$callback();
});
stream.start();
});
}
],
function (error) {
if (error) {
console.error('Error writing vmdk stream to output file');
console.error(error.message);
console.error(error.stack);
return callback(error);
}
return callback();
});
};
DiskImage.prototype.snapshotZvol = function (callback) {
var self = this;
console.log('Taking Snapshot of zvol.');
zfs.snapshot(self.zvolName + '@vmdk-img-convert', function (error) {
if (error) {
return callback(error);
}
return callback();
});
};
DiskImage.prototype.zfsSendSnapshot = function (callback) {
var self = this;
console.log('Compressing and saving ZFS stream.');
exec(
'/usr/sbin/zfs send ' + self.zvolSnapshotName
+ ' | bzip2 > ' + self.outputFile,
{},
function (error, stdout, stderr) {
if (error) {
return callback(new Error(stderr.toString()));
}
return callback();
});
};