Building Android from source can be an intimidating task especially when compared to building Android applications or compiling components from system languages. CBI acts as a bridge between Copperhead’s OS experts, who have years of experience with Android, and users who are looking to benefit from building CopperheadOS from source in-house.
The community builders initiative is a channel from Copperhead to assist external builders looking to expand on a CopperheadOS deployment for commercial and/or non-profit purposes. Personal device users may benefit from this channel as well though the initiative will really benefit larger (>10 devices) deployments.
There are many types of individuals, organisations and businesses that benefit from involvement in CBI. Having control over the source code of an internal deployment is beneficial in that the company controls the signing keys and may have policies in place that won’t keep up with official CopperheadOS releases.
The possibilities are endless and some examples include:
Members of CBI receive:
Before enrolling in CBI members are expected to:
Email us firstname.lastname@example.org to get started in the enrollment process. If you experience issues building CopperheadOS from source please let us know on our official bugtrackers. General OS bugs can be filed here while device specific bugs can be filed on their respective issue trackers (ie: Pixel 2 XL). We look forward to working with you.
This documentation assumes you’re using Ubuntu 18.04. Contact email@example.com if you’ve had success on other OS’s.
CopperheadOS currently has official build support for the following devices:
In the past CopperheadOS supported:
It can be ported to other Android devices with Treble support via the standard device porting process. Most devices lack support for the security requirements needed to match how it works on the officially supported devices.
Since this is syncing the sources for the entire operating system and application layer, it will use a lot of bandwidth and storage space.
You likely want to use the most recent stable tag, not the development branch, even for developing a feature. It’s easier to port between stable tags that are known to work properly than dealing with a moving target.
The pie branch is used for the Pixel, Pixel XL, Pixel 2, Pixel 2 XL and other devices:
mkdir copperheados-pie cd copperheados-pie repo init -u https://github.com/CopperheadOS/platform_manifest.git -b pie repo sync -j32
If your network is unreliable and
repo sync fails, you can run the
sync command again as many times as needed for it to fully succeed.
To update the source tree, run the
repo init command again to select the branch or tag and then
repo sync -j32 again. You may need to add
--force-sync if a repository from switched from
one source to another, such as when CopperheadOS forks an additional Android Open Source Project
repository. You don’t need to start over to switch between different branches or tags. You may
need to run
repo init again to continue down the same branch since CopperheadOS only provides a
stable history via tags.
Chromium is now prebuilt and included in the Copperhead source. The following is left for users who still wish to build Chromium on their own.
Before building CopperheadOS, you need to build Chromium for the WebView and optionally the
standalone browser app. CopperheadOS uses a hardened fork of Chromium for these. It needs to be
rebuilt when Chromium is updated or the CopperheadOS
chromium_patches repository changes.
Chromium and the WebView are independent applications built from the Chromium source tree. The CopperheadOS Chromium build is located at external/chromium and includes the WebView.
See Chromium’s Android build instructions for details on obtaining the prerequisites.
mkdir chromium cd chromium fetch --nohooks android --target_os_only=true
Sync to the latest stable release for Android:
gclient sync --with_branch_heads -r 66.0.3359.158 --jobs 32
Apply the CopperheadOS patches on top of the tagged release:
git clone https://github.com/CopperheadOS/chromium_patches.git cd src git am ../chromium_patches/*.patch
Note that we don’t have our own public repository at the moment because Chromium is too large to host it on GitHub or Bitbucket where we are hosting the other repositories.
Then, configure the build in the
gn args out/Default
target_os = "android" target_cpu = "arm64" is_debug = false is_official_build = true is_component_build = false symbol_level = 0 ffmpeg_branding = "Chrome" proprietary_codecs = true android_channel = "stable" android_default_version_name = "66.0.3359.158" android_default_version_code = "335915852"
To build Monochrome, which provides both Chromium and the WebView:
ninja -C out/Default/ monochrome_public_apk
The apk needs to be copied from
into the Android source tree at
Standalone builds of Chromium and the WebView can be done via the
system_webview_apk targets but those aren’t used by CopperheadOS. The build system isn’t set up
for including them and the standalone WebView isn’t whitelisted in
The build has to be done from bash as envsetup.sh is not compatible with other shells like zsh.
Set up the build environment:
Select the desired build target (
aosp_marlin is the Pixel XL):
choosecombo release aosp_marlin user
For a development build, you may want to replace
userdebug in order to have better
debugging support. Production builds should be
user builds as they are significantly more
secure and don’t make additional performance sacrifices to improve debugging.
To reproduce a past build, you need to export
BUILD_NUMBER to the values
set for the past build. These can be obtained from
in a build output directory and the
properties which are also included in the over-the-air zip metadata rather than just the OS
The signing process for release builds is done after completing builds and replaces the dm-verity trees, apk signatures, etc. and can only be reproduced with access to the same private keys. If you want to compare to production builds signed with different keys you need to stick to comparing everything other than the signatures.
Extract the vendor files corresponding to the matching release:
./script/prepare-vendor-device DEVICE BUILD_ID
Note that android-prepare-vendor is non-deterministic for apk and jar files where Google doesn’t provide them unoptimized / unstripped. This was unintentionally improved by Google for the Pixel and Pixel XL since Google stopped including odex files in the main system image and they are now provided as unstripped apk files.
Keys need to be generated for resigning completed builds from the publicly available test keys. The keys must then be reused for subsequent builds and cannot be changed without flashing the generated factory images again which will perform a factory reset. Note that the keys are used for a lot more than simply verifying updates and verified boot. Keys must be generated before building for the Pixel and Pixel XL due to needing to provide the keys to the kernel build system, but this step can be done after building for Nexus devices.
The keys should not be given passwords due to limitations in the upstream scripts. If you want to secure them at rest, you should take a different approach where they can still be available to the signing scripts as a directory of unencrypted keys. The sample certificate subject can be replaced with your own information or simply left as-is.
The Nexus 5X, Nexus 6P, Pixel and Pixel XL use Android Verified Boot 1.0. The Pixel 2 and Pixel 2 XL use Android Verified Boot 2.0 (AVB). Follow the appropriate instructions below.
To generate keys for marlin (you should use unique keys per device variant):
mkdir -p keys/marlin cd keys/marlin ../../development/tools/make_key releasekey '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressfirstname.lastname@example.org' ../../development/tools/make_key platform '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressemail@example.com' ../../development/tools/make_key shared '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressfirstname.lastname@example.org' ../../development/tools/make_key media '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressemail@example.com' ../../development/tools/make_key verity '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressfirstname.lastname@example.org' cd ../..
Generate the verity public key:
make -j20 generate_verity_key out/host/linux-x86/bin/generate_verity_key -convert keys/marlin/verity.x509.pem keys/marlin/verity_key
Generate verity keys in the format used by the kernel for the Pixel and Pixel XL:
openssl x509 -outform der -in keys/marlin/verity.x509.pem -out kernel/google/marlin/verity_user.der.x509
The same kernel and device repository is used for the Pixel and Pixel XL. There’s no separate sailfish kernel.
To generate keys for taimen (you should use unique keys per device variant):
mkdir -p keys/taimen cd keys/taimen ../../development/tools/make_key releasekey '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressemail@example.com' ../../development/tools/make_key platform '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressfirstname.lastname@example.org' ../../development/tools/make_key shared '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressemail@example.com' ../../development/tools/make_key media '/C=CA/ST=Ontario/L=Toronto/O=CopperheadOS/OU=CopperheadOS/CN=CopperheadOS/emailAddressfirstname.lastname@example.org' openssl genrsa -out avb.pem 2048 ../../external/avb/avbtool extract_public_key --key avb.pem --output avb_pkmd.bin cd ../..
avb_pkmd.bin file isn’t needed for generating a signed release but rather to set the public
key used by the device to enforce verified boot.
Incremental builds (i.e. starting from the old build) usually work for development and are the normal way to develop changes. However, there are cases where changes are not properly picked up by the build system. For production builds, you should remove the remnants of any past builds before starting, particularly if there were non-trivial changes:
rm -r out
Start the build process, with -j# used to set the number of parallel jobs to the number of CPU threads. You also need 2-4GiB of memory per job, so reduce it based on available memory if necessary:
make target-files-package -j20
The normal production build process involves building a target files package to be resigned with secure release keys and then converted into factory images and/or an update zip via the sections below. If you have a dedicated development device with no security requirements, you can save time by using the default make target, leaving the bootloader unlocked and flashing the raw images that are signed with the default public test keys:
Technically, you could generate test key signed update packages. However, there’s no point of sideloading update packages when the bootloader is unlocked and there’s no value in a locked bootloader without signing the build using release keys, since verified boot will be meaningless and the keys used to verify sideloaded updates are also public. The only reason to use update packages or a locked bootloader without signing the build with release keys would be testing that functionality and it makes a lot more sense to test it with proper signing keys rather than the default public test keys.
For the Pixels, build the tool needed to generate A/B updates:
make -j20 brillo_update_payload
For HiKey and HiKey 960, build dumpkey:
make -j20 dumpkey
Generate a signed release build with the release.sh script:
The factory images and update package will be in
out/release-marlin-$BUILD_NUMBER. The update
zip performs a full OS installation so it can be used to update from any previous version. More
efficient incremental updates are used for official over-the-air CopperheadOS updates and can be
generated by keeping around past signed
target_files zips and generating incremental updates
from those to the most recent signed
Like the Android Open Source Project, CopperheadOS contains some code that’s built separately and then bundled into the source tree as binaries. Ideally, everything would be built-in tree with the AOSP build system but it’s not always practical.
Unlike AOSP, CopperheadOS builds the kernel as part of the operating system rather than bundling a pre-built kernel image.
F-Droid is bundled as an apk in the external/F-Droid repository.
The privileged extension built from source from the privileged-extension repository as part of the normal build process.
Early AOSP port:
Early CopperheadOS port:
Early CopperheadOS testing:
Full CopperheadOS port:
Full CopperheadOS testing:
CopperheadOS kernel code is GPL2, so derivatives using only the kernel changes simply need to respect the usual GPL2 rules by making the sources needed to build the kernel available, etc.
CopperheadOS userspace code is primarily licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license so a commercial license is required to earn money from derivatives using the userspace code. Licensing can be based on revenue sharing so don’t be afraid to contact email@example.com for small scale commercial licensing.
CopperheadOS art and branding is primarily licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license. Derivatives that are being distributed need to replace the boot animation, wallpaper and other art / branding. The current branding to replace, which will expand over time:
The ‘CopperheadOS’ branding itself is trademarked. Derivatives should come up with their own project name and globally replace ‘CopperheadOS’ with ‘NewProjectName’ if they’re being distributed. They should state that they use code based on CopperheadOS / ported from CopperheadOS but shouldn’t claim to actually be CopperheadOS itself. The current list of strings to replace, which will expand over time: