Open Source Swift: Up and Running
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The document discusses a meetup focused on using open-source Swift, emphasizing the need for specific versions of Ubuntu and libraries to compile and run Swift applications effectively. It provides practical instructions for using Docker and Vagrant to set up a development environment, along with example commands and links to resources. Additionally, it touches on the differences between Swift on Linux and OSX, particularly regarding the absence of the Objective-C runtime and potential runtime issues with certain libraries.
![June 1, 2016
Open-Source Swift: Up and Running
Swift<Austin>() -> [Meetup][0]](https://image.slidesharecdn.com/osswitft-upandrunning-aussw160601-160602041245/85/Open-Source-Swift-Up-and-Running-1-320.jpg)
Open Source Swift: Up and Running
- 1. June 1, 2016 Open-Source Swift: Up and Running Swift<Austin>() -> [Meetup][0]
- 2. Slides will be posted No need to try to write everything down. I’ll post a link to the Meetup.com comments for this meeting.
- 3. Please, STOP me at your convenience Swift is new It is changing very quickly We’re all learning this together Please share your experience with us
- 4. Assumptions ✤ You want to be able to Compile/Run/Test/Learn “Pure” Swift ✤ That is: Swift without the closed-source Objective-C runtime (more on that later) ✤ You don’t want to have to build Swift and LLDB from scratch ✤ At least not at this meeting ✤ You aren’t running the Exact, Precise versions of Ubuntu (15.10 or 14.04) Apple Supports on the machine in front of you ✤ (If you are, then the first part of the meeting won’t be necessary for you, please hang on for a while.)
- 5. Prerequisites ✤ You need a specific version of Ubuntu (15.10 or 14.04) ✤ You need specific libraries installed ✤ You need specific executables installed ✤ And those might change at any (or every) snapshot ✤ … OR, of course, you can CHEAT (and probably should)
- 6. Containers all the way down… ✤ We’re going to talk through a couple of options: ✤ Docker ✤ Vagrant ✤ I’m sure there are others
- 7. Swift Roulette: Step Right Up & Pick aVersion ✤ Usually several versions to pick from on swift.org/download ✤ The current release version is there (but that’s OLD) ✤ Historically, we’ve gotten a new SNAPSHOT every couple of weeks or so ✤ But, we just got Swift 3.0 Preview 1, (YESTERDAY!!) so I don’t know how that might affect the SNAPSHOT schedule
- 8. Swift Roulette: Step Right Up & Pick aVersion ✤ Tonight, I’m going to use the 3.0 preview 1 ✤ And I’m going to do it via Docker/Vagrant
- 9. Docker ✤ Seems to be coming the de-facto standard (from what I can see) ✤ Has issues with development (especially debugging - more later) ✤ Easy to use for deployment ✤ (You can use "carlbrown/docker-swift:latest", as a base ✤ at least until the rest of the ecosystem catches up with the latest drop)
- 10. Installing Docker Mac or Windows https://www.docker.com/products/docker-toolbox
- 11. Docker commands docker run -it -v `pwd`:/Project swiftaustin-docker-swift ls /Project docker build -t "swiftaustin-docker-swift" .
- 12. Vagrant ✤ Free VM software ✤ Build from spec file ✤ I tend to use this for development/debugging, and then move to Docker for deployment
- 14. Vagrant commands vagrant ssh vagrant up Options and such are specified in vagrantfile vagrant stop vagrant destroy
- 15. June 1st, 2016 “Hello,World” Really simple program with Docker and Vagrant configs and instructions https://github.com/SwiftAustin/HelloWorld
- 16. Vagrant “Hello,World” start with: git clone https://github.com/SwiftAustin/HelloWorld.git then: cd HelloWorld run: vagrant up then: vagrant ssh then: cd /Project && swift build && ./build/debug/Project
- 17. Docker “Hello,World” start with: git clone https://github.com/SwiftAustin/HelloWorld.git then: cd HelloWorld run: docker build -t "swiftaustin-docker-swift" . then: docker run -v ${PWD}:/Project swiftaustin-docker-swift bash -c ”cd /Project && swift build && .build/debug/Project"
- 18. ✤ swift build command expects a particular directory structure: ✤ Package.swift ✤ Sources/ ✤ main.swift ✤ Tests/ ✤ LinuxMain.swift Swift Package Manager:A Brief Introduction
- 19. Playing with the REPL ✤ from vagrant ssh ✤ swift Welcome to Swift version 3.0-dev (LLVM 3863c393d9, Clang d03752fe45, Swift e996f0c248). Type :help for assistance. 1>
- 20. REPL with Docker ✤ REPL (and debugger) require root access (to be able to attach to processes) ✤ If you forget, you’ll get: ✤ To type, you also need -it for interactive and tty docker run -it --privileged=true -v ${PWD}:/Project docker-swift swift error: failed to launch REPL process: process launch failed: 'A' packet returned an error
- 21. Differences from OS X ✤ No Objective-C runtime ✤ Many casts between object types just fail ✤ Many libraries that work on OS X explode on Linux (often at runtime) ✤ e.g. I can put an Int64 into a Dictionary, but passing to SwiftyJSON crashes ✤ Many parts of Foundation just aren’t there ✤ Embrace your inner NSUnimplemented()