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crDroidAndroid Official Requirements

This repository contains quality requirements for every device maintainer. Rules are established by crDroid core team to meet same standards on every device, keep users' data safe and enhance their experience.

General rules

  • All maintainers must have knowledge about source control tools such as git and repo.
  • All maintainers must release device sources publicly at crDroid Android organization on Github, here includes common device tree (if present), device tree and kernel
  • Device tree and device specifc sources need to be cloned via crdroid.dependencies and not via vendorsetup.sh script at built time (that if you want to clone stuff at build time)
  • Vendor is not mandatory due to possible proprietary code that can result in DMCA, but highly recommended also
  • All sources must be fully synced (pushed to GitHub) prior to every official build release
  • Device trees can be co-maintained
  • All maintainers must test every build before release this including with testers if possible in order to avoid issues
  • If some quality requirements (more on that below) can’t be passed, the maintainer must provide the reason for the exception while applying for maintainer status
  • Maintainers must respect each other, any act of hate or abuse will be severely punished
  • A forum thread (usually XDA) must be made using official template and contain all the device documentation such as installation steps, download links, sources
  • Starting with crDroid 11, is manadatory to have install instructions added to install_docs repo.

Communication and chat rules

  • The team communicates using Telegram group chat that you'll get an invite to when applying
  • PMs should be avoided as much as possible so all users can participate in a discussion
  • Mentions shouldn’t be misused nor notifying too many (possibly unrelated) people, when mentioning try to describe the problem as much as possible, avoid mentions that forces the person to read the whole conversation (e.g. ‘@devnick Can you help???’ in the middle of 20 messages long conversation, instead use ‘@devnick I get an error x when compiling y after adding z, do you have any idea about it?’)
  • Don’t spam about any ETAs, upcoming source updates or features to add
  • We encourage features to be added via pull request, so we can review code and decide to implement
  • Specific bugs should be reported via Github Issue section in the affected repository or via issue_tracker
  • Feature requests should be made using Pull Requests with a properly prepared and tested commits

Git:

  • Git trees should be maintained in a tidy and organized manner
  • Release branches (ones that are used for official releases) must be named after current Android version, e.g. Android 12L -branch_name-> 12.1, this naming is mandatory (excluding cases described at the next point)
  • In the case of incompatibility with current, already hosted device sources, maintainers will need to create a dedicated branch for their device on said repos (eg. 12.1-cepheus)
  • Maintainers are free to create additional backup/testing branches
  • Original commit authorship must be maintained. If you modified it by some degree (forward port, conflict fix) you can leave a signoff or add your note at the end of a commit message, e.g. 'xNombre: fixed for R' Commits must preserve proper and informative naming, e.g. 'sm6150-common: Add missing camera prop' no 'fix cam' or 'aldksjflkajsd'. For kernels shortened path or affected source file must be used for name, e.g. 'block: cfq: Fix uninitialized variable' or 'adsprpcd: Fix memory leak'
  • Commits must describe the change, especially reverts. Commits without proper messages are meaningless, showing that you have no actual idea what you’re doing. Reverts without a message doesn’t let others know what problem it was causing and it is generally bad for community
  • Rebasing and force-pushing is allowed as long as it doesn’t affect other users badly, e.g. don’t force-push main branch of a common dt repository until consulted with all maintainers using it
  • When force-pushing a branch it is advised to create a copy of it just in case, named 'mybranch-old' or 'mybranch-today's date'

Builds quality requirements

Hardware:

  • Audio
    • All audio outputs that are available in stock rom must be operational
  • RIL
    • Must be operational if it is available in stock rom, it must not crash in any case
    • Devices should support call recording
  • Camera
    • Default’s system app - Aperture must be working, however can be overridden. Prebuilt camera apps extracted from stock (like AnxCamera) can be included only if it is fully functional and doesn’t crash randomly
  • USB
    • All usb features such as MTP, PTP, ADB, tethering must be working
  • Bluetooth
    • Must be fully operational
    • Maintainers can switch to A2DP stack if their hardware supports it
  • Wifi
    • 5GHz must be working if it’s available in stock rom
    • Wifi hotspot must be working and should support 5GHz
  • Fingerprint Sensor
    • Must be operational if included
  • Sensors
    • All basic sensors must be working
  • GPS
    • Must be operational and support same range of satellite types as stock
  • Storage
    • Every storage memory must be working, internal and external (like sd cards)
    • Devices must support encryption. FDE devices should switch to FBE, FBE encryption must be enabled by default
    • Devices should be able to use latest encryption method following Google recommendations, metadata partition should be used when available

Kernel:

  • Builtin kernel must not modify default hardware configuration, which is altering cpu/gpu/mem/etc frequency/voltage because of stability reasons
  • Must be built with stack protector strong
  • Must be built with selinux and seccomp enabled, audit can be disabled
  • Kernels can implement blockers for system tweaks like L Speed, LKT etc, however, must not implement blockers for any of user apps, like PUBG
  • You must not use any commit that masks disabled selinux or any other security-related feature; cmdline patches for passing Safetynet are allowed (however deprecated in 12.0 and up)

Vendor

Maintainers are free to use stock-extracted blobs, blobs from other devices or leaked BSPs. However, maintainers must test them after any alteration and make sure new blobs are fully operational. They must check logcat and dmesg for any unusual output (like dlsym errors).

Software:

  • Only production builds can be shipped (user/userdebug)
  • Official builds can be released as weekly, monthly or nightlies when needed but at least they must be released on every crDroid minor version update
  • Selinux can be permissive during initial bringup days, only in beta builds. It must be enforced in every official release after non-dt related source is deemed stable
  • Sepolicy must meet security standards, it must cover every system and vendor component (no random denials), however it must not contain any rules for 3rd party apps
  • Neverallows MUST NOT be masked using SELINUX_IGNORE_NEVERALLOWS
  • Maintainers must not disable any permissions related checks, particularly alter ro.control_privapp_permissions
  • Official builds must not be released with gapps unless it is impossible to flash them without bootloop
  • If releasing with gapps, the very basic package must be included; any additional packages that are not necessary for basic functionality are not allowed
  • Official builds must not contain any additional apps included by the maintainer, except from apps extracted from stock rom and GCam

Version history:

  • 1.0 - First release
  • 1.1 - Reviewed and adapted some rules
  • 1.2 - Further clarifications
  • 1.3 - Security hardening, clarify sources maintaining, drop our gapps
  • 1.4 - Clearning vendor inclusion and more clarification
  • 1.5 - Define rule for vendorsetup.sh clone
  • 1.6 - Add install instructions