1. Snap your App!
Ted Gould
ted@canonical.com
@tedjgould
Texas Linux Fest
21 Aug 2015

2. The Plan
●
Give instructions on getting Snappy installed
●
Talk about Snappy
●
Give instructions on downloading demo
●
Talk about building apps for Snappy
●
Build an app for Snappy

3. QEMU (Virtual Machine Manager)
$ sudo apt-get install
qemu-kvm ubuntu-virt-
mgmt python-spice-
client-gtk
$ kvm-ok

4. Snappy Image
$ wget
http://releases.ubuntu.com/15.04/ubuntu-
15.04-snappy-amd64-generic.img.xz
$ unxz ubuntu-15.04-snappy-amd64-
generic.img.xz

5. Test It!
$ kvm -m 512 -redir :8090::4200
-redir :8022::22 ubuntu-15.04-snappy-
amd64-generic.img
$ ssh -p 8022 ubuntu@localhost

6. Play with it!

8. Ubuntu
●
Debian based (package format and policies)
●
Regular Releases
●
Updated via Apt

9. Ubuntu Phone
●
Click Applications
●
System Image Updates

10. Why Click?
Millions
Thousands

11. Leaves are Simpler
Single Dependency

12. Click
App
Ubuntu TouchUbuntu Touch
Click
App
Click
App
Click
App

13. Reviewers Don't Scale

14. Why Image Based Updates?
●
Binary: Works or it doesn't
●
Provides opportunity to
rollback
●
Simple testable states

15. — Us, acting cooler than
we actually are
“Let's Take Ubuntu Phone
all the way to 11!”

16. Snappy Ubuntu Core
●
Transactional Updates
●
Snap based Apps
●
Snap frameworks
●
OS snap

17. App
AppApp
Framework
Snappy Ubuntu CoreSnappy Ubuntu Core
Hardware Abstraction
App
Gadget

18. Hardware Abstraction
●
Provided by board vendors
●
Allows for custom drivers and config

19. “Gadget” Snap
●
Per-device configuration
●
Snaps to install
●
Permissions
●
Branding

20. Framework Snaps
●
Provide shared services
●
Mediate resources
●
IPC to Apps
Mir System
Compositor

21. Why snap? (not click)
●
Click v2.0
●
Click only for leaf nodes
●
Support for OS and framework snaps
●
Lower level components

22. Cloud
Internet
Of Things
Corp
IT
Consumer Devices

23. Trend: Internet of Things
● Smaller computers
● Internet connectivity
● Full OS resources
● Must be reliable

24. Trend: Consumer Devices
● More complex
interactions
● Bullet-proof
experience
● Complex security
situations

25. Trend: Corporate/Education IT
●
Verifiable Images
●
Upgrades don't cause
downtime
●
Limited apps and app
permissions

26. Trend: Cloud and Containers
●
Small base OS (JeOS)
●
Unit of specialized code
●
Tested as a unit

27. Snappy Store

28. Store Story: Erle Robotics

29. Store Store: Networking

30. Try it today!
http://ubuntu.com/snappy

31. Progress Check-In

32. Import into VMM
$ sudo cp ubuntu-15.04-snappy-amd64-generic.img
/var/lib/libvirt/images/
$ sudo chown libvirt-qemu.kvm
/var/lib/libvirt/images/ubuntu-15.04-snappy-amd64-
generic.img

34. $ ifconfig
$ sudo snappy install docker
$ sudo snappy install snapcraft-daily.ted
$ snapcraft-daily.snapcraft help
Install Snapcraft

35. What is a snap?
●
A self-contained
bundle
●
Includes
dependencies
●
Works with
frameworks
You are
here

36. Snap Definition (package.yaml)
name: photoviewer
version: 0.1
vendor: Ted Gould <ted@canonical.com>
architecture: amd64
frameworks: [mir]
binaries:
- name: photoviewer
exec: qmlscene main.qml --
caps:
- mir_client
- network-client

37. https://developer.ubuntu.com/en/snappy/guides/filesystem-layout/
Snap Directories

38. Snapcraft
Snap
Snapcraft
Your
Code
Upstream
Depends

39. Block Inception

40. Snapcraft.yaml
parts:
qml:
plugin: qml
photoviewer:
plugin: copy
files:
main.qml: main.qml
PhotoViewerCore: PhotoViewerCore
snappy-metadata: meta

41. Demo