Generate disk image using hdiutil

[johanneswuerbach]

As discussed in #18. This removes the libguestfs dependency.

docker-machine -D create -d xhyve --xhyve-disk-size "2000" xhyve

docker@boot2docker:~$ df -h
Filesystem                Size      Used Available Use% Mounted on
tmpfs                   896.6M    123.7M    772.9M  14% /
tmpfs                   498.1M         0    498.1M   0% /dev/shm
/dev/vda1               996.5M      2.0M    926.3M   0% /mnt/vda1
cgroup                  498.1M         0    498.1M   0% /sys/fs/cgroup
/dev/vda1               996.5M      2.0M    926.3M   0% /mnt/vda1/var/lib/docker/aufs

docker info
Containers: 1
Images: 2
Server Version: 1.9.0
Storage Driver: aufs
 Root Dir: /mnt/vda1/var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 4
 Dirperm1 Supported: true
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 4.1.12-boot2docker
Operating System: Boot2Docker 1.9.0 (TCL 6.4); master : 16e4a2a - Tue Nov  3 19:49:22 UTC 2015
CPUs: 1
Total Memory: 996.3 MiB
Name: boot2docker
ID: TZZC:VPCB:ZLL6:UCV5:HKZZ:4ZCI:XWVB:UHZG:HY5Q:EZER:ABYI:OXP6
Debug mode (server): true
 File Descriptors: 12
 Goroutines: 20
 System Time: 2015-11-22T11:21:38.821801822Z
 EventsListeners: 0
 Init SHA1: 
 Init Path: /usr/local/bin/docker
 Docker Root Dir: /mnt/vda1/var/lib/docker
Labels:
 provider=xhyve

Output as expected 1GB (- 1GB swap created by b2d https://github.com/boot2docker/boot2docker/blob/master/rootfs/rootfs/etc/rc.d/automount#L28)

This is using now the same method as the bundled vbox and hyper-v drivers are using to bootstrap the disk.

I'll remove libguestfs, if you think this is 👍

[zchee]

@johanneswuerbach LGTM.

I understand all now! Sorry that I can not understand in the discus :(
Check your PR code, and I will merge later.

I want to develop the implementation of tuntap and xpc, so I'm glad to resolve this issue.
Thanks PR, and long discus :)

[zchee]

@johanneswuerbach Sorry, let me ask you a small question.
Why dmg instead of img? The method, what more the performance will be better? Or another reason?
When using dd, can create img disk image.
Either is fine. but I’m curious about this changed.

[johanneswuerbach]

'dmg' is the hdiutil default, actually I planned to use sparse (a vbox like self growing image), but couldn't get it to work and will retry later. Haven't look at performance yet, but docker pull had roughly the same speed as my vbox machine.

[zchee]

@johanneswuerbach

I planned to use sparse (a vbox like self-growing image)

I do not know exactly sparseimage, but good idea.

but couldn't get it to work and will retry later

Can you tell me the details? It is very interested.

Haven't look at performance yet, but docker pull had roughly the same speed as my vbox machine.

Whether that impression is intuitive? or measurement?
I was easily measured img and vboxfs using the dockernize iozone previously, certainly slow results were obtained.

[zchee]

Thanks fixed english :)

[johanneswuerbach]

xhyve

$ dd if=/dev/zero of=/mnt/vda1/tmp/out bs=8k count=200k; rm -f /mnt/vda1/tmp/out
204800+0 records in
204800+0 records out
1677721600 bytes (1.6GB) copied, 2.531537 seconds, 632.0MB/s

vbox

$ dd if=/dev/zero of=/mnt/sda1/tmp/out bs=8k count=200k; rm -f /mnt/sda1/tmp/out
204800+0 records in
204800+0 records out
1677721600 bytes (1.6GB) copied, 3.222129 seconds, 496.6MB/s

looks sane

[johanneswuerbach]

Can you tell me the details? It is very interested.

it failed to format the disk, but I didn't spend much time to investigate why

[johanneswuerbach]

I'll remove libguestfs, if you think this is 👍

Done

[zchee]

@johanneswuerbach
Good!
The xhyve is better than vboxfs, it seems that was a mistake of my measurement.(?)

it failed to format the disk, but I didn't spend much time to investigate why

Ok. I keep in mind the method.

All LGTM.
Merged!

Thank you again :)