How Does Contributors' Involvement Influence the Build Status of an Open-Source Software Project?

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1. 1.

   Marcel Rebouças How Does Contributors’ Involvement Influence the Build Status

   of an Open-Source Software Project? Renato Olivera Gustavo Pinto Fernando Castor mscr@cin.ufpe.br ros3@cin.ufpe.br gpinto@ufpa.br castor@cin.ufpe.br
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   Motivation (1/3) Casual contributors represent a large part of the

   OSS community (49%) and their contributions are far from trivial.
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   Motivation (2/3) Only 20% of the new contributors on OSS

   projects become long-term members.
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   Motivation (3/3) Lack of awareness and guidance during their first

   steps makes it hard to contribute!
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   They have little or no prior knowledge on the project

   domain Casual Contributors They might put more effort to create their first pull- request
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   Are casual contributors more prone to create a failing build?

   Research Question
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   Methodology TravisTorrent TravisCI CI Build Data Commiter Data Dataset Dataset

   without duplicated users User Disambiguation Technique Data Cleaning Dataset with 1,074 curated projects Data Processing Data Statistical Tests
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   Data Overview 1,074 projects 35,360 users 619,370 builds

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   Data Overview # Users 0 5000 10000 15000 20000 Builds

   1 2 3 4 5+ 0 150000 300000 450000 600000 Casual Non-Casual 1,074 projects 35,360 users 619,370 builds # Builds
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    Results 0 250 500 750 1000 No difference Higher Casual

    Success Lower Casual Success Being a casual contributor is not a strong indicator for creating failing builds # Number of Projects
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    0 22.5 45 67.5 90 0 1.15 2.3 3.45 4.6

    Results Casual contributions are smaller, both in modified source-code lines and modified files Median of Modified LoC Median of Modified Files
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    0 1.15 2.3 3.45 4.6 No difference Higher Casual Success

    Lower Casual Success Results Projects in which casuals fail more than non-casuals run more jobs per build. Median of jobs per build
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    Take-Away Message Are you a casual contributor?

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    Take-Away Message Are you a casual contributor? Go ahead and

    contribute!
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    None
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    gpinto@ufpa.br @gustavopinto