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https://social.samsunginter.net/@rzr/101930569288659296# #Cooperation & #UpDownStream Flows : Hints tips and tricks I wish I knew when I started to contribute to #FLOSS...

Phil "RzR" Coval

April 11, 2019

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  1. Samsung Open Source Group 1 https://social.samsunginter.net/@rzr
    Up/Down Stream Flows
    Harmony in community not “Far West” !

    #RennesEmbedded, Rennes France <2019-04-11>
    Philippe Coval
    Samsung Open Source Group / SRUK
    [email protected]

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  2. Samsung Open Source Group 2 https://social.samsunginter.net/@rzr
    $ who am i

    Software engineer at Samsung OSG
    – Belong to SRUK team based in Rennes, France
    – Currently working on “Privacy by Design” Web of Things,
    – Interest: Free Libre Open Source, OpenData, OpenDesign...

    Ping me on the fediverse:
    – https://social.samsunginter.net/@rzr

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  3. Samsung Open Source Group 3
    “Without trust there's no cooperation.
    And without cooperation there's no progress.
    History stops.”
    ~ Rick Yancey, The Last Star

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  4. Samsung Open Source Group 4 https://social.samsunginter.net/@rzr
    Types of FLOSS models

    Built with OSS:
    – Some libs are used in products

    + patches (shared or not)

    Built on OSS: Custom code on top
    – Free OSS base and un-free extensions
    – The base is shared to/with community

    Behind doors / Inner source
    – Public on releases (Code drop)

    not development branches or metadata

    May not review community contribs

    To open development:
    – Governance models

    Community is involved


    decision making, roadmaps

    Constitution, CoC
    – may help in case of conflicts

    To OpenSource foundations
    – Copyright holders
    – Neutral entity founded by members

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  5. Samsung Open Source Group 5 https://social.samsunginter.net/@rzr
    Avoid Pitfalls

    FLOSS is gratis (if your time has no value)
    – Freeriders (taking without giving)’s back draft: Reputation, Community Support…

    FLOSS Code will evolve with or without you!
    – Your base is already open, and will improve if used (by others)
    – You will never catch up, it will affect your quality (and users’ security)

    Better focus on your value and build a better common base:
    – Design smart, isolate elements:

    UNIX philosophy & KISS principle not “Not Invented here”

    Be a good and smarter citizen since day one
    – Comply licenses, Separate upstream and downstream works

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  6. Samsung Open Source Group 6 https://social.samsunginter.net/@rzr
    How to maximize efficiency of FLOSS use

    Improve culture & skills:
    – Dedicate experts with FLOSS Culture: Tech & Legal background
    – Part of company and involved in communities
    – Scale: Learn and Teach

    Setup infrastructure: Listen to developers requirements
    – To use their most productive environments:

    GNU/Linux desktop, any flavours, root
    – To reach communities

    IRC, mailing lists etc
    – Transparent proxies/firewall, Flexible Email (IMAP/SMTP), bandwidth (setup cache)

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  7. Samsung Open Source Group 7 https://social.samsunginter.net/@rzr

    Adopt upstream tools: SCM (git), build system
    – Switch to git: The sooner, the better
    – Eventually use bridge like git-svn (but it will create more confusion)
    – git is flexible, not github (how will you export reviews and PR?)

    CI may help too (if not required)
    – Can be self hosted on site or outsourced

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  8. Samsung Open Source Group 8 https://social.samsunginter.net/@rzr

    Forward patches to upstream first
    – Maybe you are doing it wrong? Or upstream may suggest better way.
    – Could be merged in stable version (safer)
    – Small changes are faster to review
    – Easier to apply to several branches (less conflicts) and revert

    Then merge downstream:
    – Adjust delay according to your policies (eg: 48h to 7days)

    Keep an eye on it, try to reduce gap
    – Technical debt is growing (until it’s upstreamed)

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  9. Samsung Open Source Group 9 https://social.samsunginter.net/@rzr
    History >>> Code

    Mixing code randomly is a risky behavior and not future proof

    Don’t break “evolution chain”
    – use external dependencies:
    – fork project in last resort but keep history

    Preserve history/authorship:
    – Avoid to import/copy code for other tree (public or private)

    Helpful commit messages:
    git commit -sam ‘context: Add X for feature Y...
    Because of Z reason...
    Bug: url://upstream/project/bug/42

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  10. Samsung Open Source Group 10 https://social.samsunginter.net/@rzr
    Linking to contexts

    Trackers might be updated after commits (xlinks, regressions etc)
    – Origin: $url (Where patch was published first)
    – Forwarded: $url (Where upstream will review it)
    – Bug: $url (Upstream context)
    – Bug-$downstream: $url or $id (downstream context)

    Bug-Debian: #42 (DEP3)
    – Relate-to: $url
    – Change-id: I1dbadc0de… (unique id to track or search)

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  11. Samsung Open Source Group 11 https://social.samsunginter.net/@rzr

    Respect authors (and their works or time), in commit messages:
    – Author: ...
    – Thanks-to:, Credit-to:, Reported-by:, Suggested-by: ...

    Author is the most knowledgeable why or how the change was made:
    – (Current or Future) License may require attributions (ex: BSD-3-Clause-Attribution)
    – May be contacted afterwards for project interest (regressions etc)

    Commits may be signed
    – Per project policy: to ensure integrity or authorship
    – Comply with project’s license
    – Ensure code is not “borrowed” from random source

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  12. Samsung Open Source Group 12 https://social.samsunginter.net/@rzr
    Legal & Security

    FLOSS is not public domain: Rights and duties
    – Different philosophies:

    Author/User, Business/Community, OSI/FSF, Permissive/Copyleft…

    SPDX: Software Package Data Exchange
    – Standard (namespace) for licensing
    – SPDX Header in source:

    SPDX-License-Identifier: GPL-2.0

    Never assume that random public code is safe
    – Minimal chain of trust to author should be established

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  13. Samsung Open Source Group 13 https://social.samsunginter.net/@rzr
    Security matters

    Scan for vulnerability and legal compliance

    Upstream code is exposed
    – it can be scanned by bots:

    Fossa, FOSSology, OpenHub/Black duck, github alerts...
    – And vulnerabilities reported (1st private, then public)

    Downstream code maybe not
    – Patches may fix ? or add more vulnerabilities
    – Scanning code, verifying code is long and costly

    Usually: gratis for FLOSS / pay for private code

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  14. Samsung Open Source Group 14 https://social.samsunginter.net/@rzr
    Git chain is robust if well linked

    git cherry-pick upstream’s changes
    – Eg: Apply fixes from release branches

    Or rebase your tree on upstream:
    – CONTINUOUSLY on post release branches
    – Follow versions: git rebase -i $tag
    – Adapt your changes on conflict:

    Hint: may split changes and upstream progressively

    Other useful commands: git blame, git bissect
    – Prefer git rebase over git merge

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  15. Samsung Open Source Group 15 https://social.samsunginter.net/@rzr
    Moving forward & Sustainability

    OSS Foundations
    – Neutral and Legal entity
    – Funded by companies and
    – Provides infrastructure
    – Training and certifications

    Originally seeded by 1 project:
    – Linux Foundation:

    From kernel to many projects:
    – OS: Tizen, Yocto, AGL
    – Middlewares:

    IoTivity, LFEdge. Onap,
    – Similar to:

    Apache, Eclipse, Document,
    OpenStack, FSF, Mozilla, Debian/
    SPI, ROS, Python, Pi, OW2 ...

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  16. Samsung Open Source Group 16 https://social.samsunginter.net/@rzr
    Prefer Co-maintenance

    Inactive upstream
    – Upstream is not your contractor
    – Shift to co-maintenance ?

    Abandonware Organization:
    – https://abandonware.github.io/
    – Community maintained packages
    – Maximize benefit, minimize effort
    – No trade off on security

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  17. Samsung Open Source Group 17 https://social.samsunginter.net/@rzr

    Avoid “Not invented here”
    – It’s easy to start a new project. It’s harder to maintain it
    – Join an existing project / Reduce duplication
    – Review changes, minimize downstream changes

    Be part of chain of trust
    – Bigger Adoption => More checks and test => care about interoperability

    Establish Long term strategy with opensource foundations:
    – Scale, Comply license, involve community...

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  18. Samsung Open Source Group 18 https://social.samsunginter.net/@rzr

    – 88M projects 2019-04-08

    – Example: Contrubution tips for IoTivity project

    – tizen-upstream-coop-tdc2014-pcoval

    Samsung’s Open Source portal
    – https://opensource.samsung.com/

    – OSI’s Simon Phipps at OW2 2018

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  19. 19
    Samsung Open Source Group
    Thanks !

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