Building CS50 on GitHub

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Building CS50 on GitHub David J. Malan [email protected] slides at cs50.ly/universe17

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This is CS50 ● CS50 ○ 800 students at Harvard, 200 students at Yale ● CS50x ○ 1M registrants online ● CS50 AP ○ 150 high schools, 5,000 students

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Problems Past ● Developing apps ● Deploying apps ● Hosting docs ● ...

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Problems Present 1. Students do work. 2. Students submit work. 3. Teaching fellows review work.

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Team ● Brian Yu ● Chad Sharp ● Hailey James ● Kareem Zidane

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Team ● Brian Yu ● Chad Sharp ● Hailey James ● Kareem Zidane

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Solutions 1. Students do work. 2. Students submit work. 3. Teaching fellows review work.

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Solutions 1. Students do work. Homegrown tool. 2. Students submit work. 3. Teaching fellows review work.

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Solutions 1. Students do work. Homegrown tool. 2. Students submit work. Homegrown tool. 3. Teaching fellows review work.

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Solutions 1. Students do work. Homegrown tool. 2. Students submit work. Homegrown tool. 3. Teaching fellows review work. Homegrown tool.

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Solutions

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Solutions 1. Homegrown tool

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Solutions 1. Homegrown tool 2. Improved homegrown tool

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Solutions 1. Homegrown tool 2. Improved homegrown tool 3. New homegrown tool

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Solutions 1. Homegrown tool 2. Improved homegrown tool 3. New homegrown tool 4. New-and-improved homegrown tool

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Solutions 1. Homegrown tool 2. Improved homegrown tool 3. New homegrown tool 4. New-and-improved homegrown tool 5. GitHub

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Solutions 1. Homegrown tool 2. Improved homegrown tool 3. New homegrown tool 4. New-and-improved homegrown tool 5. GitHub + homegrown tool

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Solutions 1. Homegrown tool 2. Improved homegrown tool 3. New homegrown tool 4. New-and-improved homegrown tool 5. GitHub + homegrown tool

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Solutions 1. Homegrown tool 2. Improved homegrown tool 3. New homegrown tool 4. New-and-improved homegrown tool 5. GitHub + Docker

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Doing Work 1. ice.harvard.edu

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Doing Work 1. ice.harvard.edu 2. nice.harvard.edu

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Doing Work 1. ice.harvard.edu 2. nice.harvard.edu 3. cloud.cs50.net

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Doing Work 1. ice.harvard.edu 2. nice.harvard.edu 3. cloud.cs50.net 4. CS50 Appliance

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Doing Work 1. ice.harvard.edu 2. nice.harvard.edu 3. cloud.cs50.net 4. CS50 Appliance 5. CS50 IDE

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Submitting Work

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Submitting Work 1. submit

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Submitting Work 1. submit 2. cs50submit

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Submitting Work 1. submit 2. cs50submit 3. GitHub:FI

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Submitting Work 1. submit 2. cs50submit 3. GitHub:FI 4. CS50 Submit with CLI

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Submitting Work 1. submit 2. cs50submit 3. GitHub:FI 4. CS50 Submit with CLI 5. CS50 Submit with GUI

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Submitting Work 1. submit 2. cs50submit 3. GitHub:FI 4. CS50 Submit with CLI 5. CS50 Submit with GUI 6. submit50

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Submitting Work 1. submit 2. cs50submit 3. GitHub:FI 4. CS50 Submit with CLI 5. CS50 Submit with GUI 6. GitHub

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Submitting Work 1. submit 2. cs50submit 3. GitHub:FI 4. CS50 Submit with CLI 5. CS50 Submit with GUI 6. GitHub 7. GitHub + Docker

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Reviewing Work

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Reviewing Work 1. Paper

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Reviewing Work 1. Paper 2. PDF

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Reviewing Work 1. Paper 2. PDF 3. CS50 Submit

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Reviewing Work

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Reviewing Work 1. Paper 2. PDF 3. CS50 Submit 4. GitHub.com

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Reviewing Work 1. Paper 2. PDF 3. CS50 Submit 4. GitHub.com 5. GitHub.com + homegrown tool 0:-)

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Why ● Client ● Server ● UI for code review ● Permissions model ○ CS50 ○ CS50x ○ CS50 AP ● Post-commit hooks ● ...

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How ● Gists? ● Pull Requests? ● GitHub Classroom? ● Commits?

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What ● Client ● Server ● UI for code review ● Permissions model ○ CS50 ○ CS50x ○ CS50 AP ● Post-commit hooks ● ...

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education.github.com

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How ● Repo per project? ● Branch per project?

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github.com/cs50/submit50

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Submitting ● git add --all ● git commit --allow-empty --message ● git push origin refs/heads/hello

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Resubmitting ● git clone --bare hello /tmp ● git symbolic-ref HEAD refs/heads/hello ● git add --all ● git commit --allow-empty --message ● git push origin refs/heads/hello

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developer.github.com/v3/repos/

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Tagging ● git clone ● git checkout refs/heads/hello ● git commit-tree HEAD^{tree} -m 20171011T230000Z ● git push origin refs/tags/20171011T230000Z

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github.com/cs50/check50

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Autograding ● git clone ● git checkout refs/tags/20171011T230000Z ● check50

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hub.docker.com/r/cs50/

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docker.com

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docker.com

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aws.amazon.com/ecs/

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GitHub + Docker 1. Student pushes code to GitHub 2. Post-receive hook informs CS50 of submission 3. CS50 informs ECS of submission 4. ECS clones repo, autogrades branch 5. ECS informs CS50 of scores

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tl;dr ● CS50 at cs50.edx.org ● CS50 IDE at cs50.io ● submit50 at github.com/cs50/submit50 ● check50 at github.com/cs50/check50 ● Slides at cs50.ly/universe17

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Building CS50 on GitHub David J. Malan [email protected] slides at cs50.ly/universe17