DPS909 & OSD600 Fall 2019

Week 1

• Course introduction
  • DPS909
  • OSD600
  • How to be successful in this course

• Labs
  • Weekly labs, typically done in class
  • Labs are due on the Friday of the week they are assigned by midnight
  • Marked using Pass/Fail scheme
  • All labs must be completed to pass the course
  • Lab 1 is available now

• Releases
  • 4 releases, some with multiple bugs/PRs required, including participating in Hacktoberfest 2019
  • Due Dates: Sept 20, Oct 31, Nov 20, Dec 6
  • Chance to work on real code, real projects
  • Big learning curve, lots of time required
  • Amazing chance to gain experience, network, build your skills and resume
  • Work with new and emerging technologies, gain exposure to tech outside the classroom

• Discussion/Readings
  • Copyright (Copyright in Canada video)
    • IANAL
    • Who created it, "owns" it.
    • Set of exclusive rights granted to the work's creator
    • "The right to copy," to produce or reproduce a work or substantial portion thereof
    • Copyright is automatic when a work is created, you don't have to register it.
    • Copyright in Canada
    • Copyright Guide
    • In a software project, there can be many copyright holders (e.g., many contributors), or all contributors may assign their copyright to the project (e.g., CLA, which we'll cover later)

• What is Open Source?
  • The Open Source Definition
  • Microsoft buys GitHub for 7.5 Billion - "We're all in on open source"
    • https://twitter.com/asynchio/status/1082702841964244992
  • Julia Evans, "How to teach yourself hard things"

Week 2

• Blogging
  • Add bio/profile info as you feel comfortable, including links to GitHub, social media, etc.
  • Blog Post Tips:
    • Use blog post titles that help a reader (or Google searcher) to know whether this is useful info to them
    • Include links: a blog should connect different resources and ideas through your experience and learning
    • Write in sections. Try to avoid a wall of text, with only a single paragraph. Consider using sub-headings, shorter paragraphs
    • Use formatting for source code.
  • One good source of blog posts on open source and software development is Hacker News. Some recent examples to look at for style:
    • https://css-tricks.com/how-to-contribute-to-an-open-source-project/
    • https://antoinevastel.com/javascript/2019/09/09/improving-obfuscator.html
    • https://localghost.dev/2019/09/everything-i-googled-in-a-week-as-a-professional-software-engineer/
    • https://randomascii.wordpress.com/2019/09/08/taskbar-latency-and-kernel-calls/

• Licenses
  • Rights, privileges, responsibilities, etc. applicable to someone other than the work's creator
  • "Terms and Conditions"
  • These must be granted by a copyright holder

• No License
  • What can you do with code you find that has no license?
  • what can I, can't I do?

• Proprietary Licenses
  • Spotify End User Agreement
  • Microsoft Windows
  • iOS 12 (pdf)

• Public Domain
  • SQLite, which is now used by literally everybody, see http://www.sqlite.org/famous.html
  • Unlicense

• BSD License
  • Family of Licenses, including 2-Clause BSD, 3-Clause BSD (aka New BDS), 4-Clause BSD
  • "Why you should use a BSD style license for your Open Source Project"
  • BSD Licenses code is usually compatible with other open/closed code, when you want to mix them.
  • Example software projects licensed under the BSD License:
    • Many Google Projects, including V8, Chromium, Go
    • D3.js
    • Django
    • nginx
    • Vi
  • Summary:
    • You need to retain the license and copyright notice
    • You can use it commercially or non-commercially (privately)
    • You can distribute it freely
    • You can modify it freely

• Discussion of projects found for Lab 1
• Lab 2
• Release 0.1 due Mon, Sept 23

Week 3

• Readings/Resources
  • Courses on Lynda
    • Git Essential Training
    • Up and Running with Git and GitHub
  • Books
    • Pro Git
    • Version Control by Example, online book
  • References
    • Git Reference
    • Visual Git Reference
    • Overview of Git Tutorials (many good ones)
    • Github documentation
    • GitHub Desktop

• Introducing git and GitHub
  • Content Addressable Filesystem and Snapshots
  • Distributed: Local vs. Remote development
  • .git directory
  • Content Integrity, SHAs (Secure Hash Algorithm)
    • git init
    • echo 'test content' | git hash-object -w --stdin
    • ls .git/objects
    • git cat-file -p d670460b4b4aece5915caf5c68d12f560a9fe3e4
  • Blobs, Trees, and Commits
  • Branches, master
  • Working Directory, Staging Area, Repository
  • What do these commands really do?
    • git clone url-to-git-repo
    • git add file.txt
    • git status
    • git rm file.txt
    • git commit -m "Added file.txt"
  • Remotes, origin, upstream

• Filing and Fixing a bug: a cookbook approach
  • set up git and GitHub
    • https://help.github.com/ has lots of great articles to help you. You can also view video guides or read the printed guides
    • setup your username in git
    • setup your email address in git
    • specify which editor git should use, for example you can use vscode
    • setup line endings (CRLF vs. LF) in git, extra notes for Windows users
    • setup ssh keys for GitHub
  • In GitHub, create a fork of the repo you want to work on
  • On your computer, clone your forked repo
  • On your computer, add a remote named "upstream" for the original repo (vs. your fork)
  • On GitHub, find or create an Issue for the change you want to make
  • On your computer, create and checkout a branch for your work, e.g., issue-1234 for Issue #1234
  • On your computer, make code changes, test them, add, and commit on your branch. Repeat as necessary.
  • On your computer, push your changes (commits) to your fork (origin)
  • On GitHub, create a Pull Request for your changes to get sent to the upstream repo
  • On your computer, fix any problems pointed out by your reviewer(s), add the file(s), commit, and push again to update your pull request

• Release 0.1 due Mon, Sept 23

Week 4

• Blogging
  • Why Blogging is Awesome
  • Keep reading the Planet, there are great posts there

• Learning Licenses: MIT
  • MIT License
  • The MIT License, Line by Line
  • One of the most widely used licenses in Open Source
  • Like the BSD License, nothing about patents (created before software was patentable in the US)
  • Example software projects licensed under the MIT License:
    • ExpressJS
    • Ruby on Rails
    • AngularJS
    • Atom, Electron
    • Bootstrap
    • node.js
    • Phaser
    • PuTTY
    • Socket.IO
  • "Do Good" forks of MIT:
    • JSON License with a great overview and history here.
    • Hippocratic License
    • Recent situation with Chef-Sugar, Chef and ICE Contract. Update from today

• More Git
  • Git Walkthrough Part I
  • Git Walkthrough Part II
  • Upstream and keeping your master branch up-to-date

• Release 0.1 due Mon, Sept 23. Any issues you need help with?
• Release 0.2
• Lab 3
• Startup Open House Event Tonight, Thurs Sept 26 4-8

Week 5

• Forking vs. Merging
  • Anyone can fork, not everyone can get work merged back in
  • My Repo: my house my rules
  • Some famous Forks
    • Firefox from Mozilla Suite
    • WebKit from KDE's KHTML
    • Blink from WebKit
    • Ubuntu from Debian
    • Sun's StarOffice became OpenOffice became LibreOffice
    • WordPress from Cafelog
    • MariaDB from MySQL
    • FireOS (Amazon for Kindle) from Android
    • io.js from node.js, which eventually became the official node.js
  • Example Fork
    • Semantic UI
    • Fomantic UI - "Fomantic was created to continue active development of Semantic-UI and has the intent to be merged back into the master repository once active development can restart."

• Merging with git
  • Where git branch splits histories apart, git merge brings them back together
  • Understanding DIFFs and Patch files
    • git diff, git show, git log -p, etc. to show DIFFs
    • Pull Requests also have links to get the raw .diff and .patch
    • How to read a DIFF file
  • Types of Merges: Fast Forward, Recursive Merges are the most common
    • --ff-only to force a fast-forward (only the branch pointer is moved, no new commit is created)
    • 3-way merges: two branch commits with a common ancestor (new commit is created with multiple parents)
    • Can have any number of parents though: one of the larges is a 66 commit octopus merge in the Linux kernel
  • How to merge
    • start with a clean working directory
      • commit your work if you can; or
      • stash (git stash list, git stash show, git stash pop)
    • checkout the branch you want to merge into
    • git merge branch_to_merge_into_this_branch
  • Various flags and commands to know:
    • git merge --squash
    • git merge --abort
    • git merge --continue
    • git branch -d
  • Merge Conflicts
    • Conflict markers <<<<<<<<<, =============, >>>>>>>>>>>>
  • Doing big merges in git

• TODO
  • Release 0.2
  • Lab 4 - TBA