Snapcraft Live - Debugging snap builds

## Building snaps - debugging builds

### Goal

Understand the tools provided to debug the build process when making a snap

### Agenda

* Point everyone at last weeks video - quick reminder on the tools we need
* Find something to snap
* Fail at snapping it
- Use debugging tools to find out why we failed
- Fix it!
* (Insert success image here)
* Meanwhile: answer questions in chat
* Bonus: Snap something on user request

### Reminder - prep

* Install snapd (see snapcraft docs)
* Install snapcraft `sudo snap install snapcraft --classic`
* Install multipass `sudo snap install multipass --classic --beta`

### Find something to snap

* https://github.com/trending/rust (or python, or go)

### Tools we will use / things we learn

`snapcraft --debug`
`source-subdir:`
`apt search libsdl2`
`dpkg -S /usr/lib...`
`https://packages.ubuntu.com/libsdl2`
`dlocate libsdl2`
`snapcraft --shell-after`

### Things we need to grok

* Snapcraft Lifecycle
- Launch VM
- (some unimportant magic to prepare the VM)
- snapcraft launches in the VM
- pull - build - stage - prime - snap
* Directory structure in the vm
snapcraft-rusted-ruins # pwd
/root
snapcraft-rusted-ruins # tree -L 2
.
├── parts # 2. Where parts are built
│   └── rusted-ruins
├── prime # 4. Collate built parts for snapping
├── project # 1. Our project source
│   ├── Cargo.toml
│   ├── LICENSE
│   ├── README.md
│   ├── array2d
│   ├── audio
│   ├── common
│   ├── download-pak.sh
│   ├── filebox
│   ├── foo
│   ├── makepak
│   ├── map-editor
│   ├── map-generator
│   ├── res
│   ├── rng
│   ├── rules
│   ├── rusted-ruins
│   ├── rusted-ruins_0.3.0_amd64.snap
│   ├── screenshots
│   └── snap
├── snap
│   └── snapcraft
├── stage # 3. Where built parts are staged
└── state # Internal snapcraft state data

21 directories, 6 files