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Docker microservice for LineageOS Continuous Integration and Continous Deployment
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Docker microservice for LineageOS Continuous Integration and Continuous Deployment

Why Docker?

A fair number of dependencies is needed to build LineageOS, plus a Linux system (and a discrete knowledge of it). With Docker we give you a minimal Linux build system with all the tools and scripts already integrated, easing considerably the creation of your own LineageOS build.

Moreover Docker runs also on Microsoft Windows and Mac OS, which means that LineageOS can be built on such platforms without requiring a dual boot system or a manual set up of a Virtual Machine.

How do I install Docker?

The official Docker guides are well-written:

If your Windows or Mac system doesn't satisfy the requirements (or if you have Oracle VirtualBox installed, you can use Docker Toolbox. Docker Toolbox is not described in this guide, but it should be very similar to the standard Docker installation.

Once you can run the hello-world image you're ready to start!

What does Docker build

Docker will produce two files in the zips directory:

  1. The main ROM zip file e.g. lineage-20.0-20230702-microG-<device-name>.zip. This file can be flashed from recovery as described in the next section.
  2. A -image.zip file e.g. lineage-20.0-20230702-microG-<device-name>-images.zip, containing a custom recovery image and any other images needed or mentioned in the LineageOS installation instructions.

How can I build LineageOS?

Before you start, make sure you have the latest version of our Docker image:

docker pull lineageos4microg/docker-lineage-cicd

The requirements for building LineageOS for MicroG are roughly the same as for building LineageOS:

  • A relatively recent x86_64 computer:

    • Linux, macOS, or Windows - these instructions are only tested using Ubuntu 20.04 LTS, so we recommend going with that.
    • A reasonable amount of RAM (16 GB to build up to lineage-17.1, 32 GB or more for lineage-18.1 and up). The less RAM you have, the longer the build will take. Enabling ZRAM can be helpful. If builds fail because of lack of memory, you can sometimes get over the problem by increasing the amount of swap, but this will be at the expense of slower build times.
    • A reasonable amount of Storage (~300 GB for lineage-18.1 and up). You might require more free space for enabling ccache, building for multiple devices, or if you choose to mirror the LineageOS sources (see below). Using SSDs results in considerably faster build times than traditional hard drives.
  • A decent internet connection and reliable electricity. :)

  • Some familiarity with basic Android operation and terminology. It may be useful to know some basic command line concepts such as cd, which stands for “change directory”, the concept of directory hierarchies, and that in Linux they are separated by /, etc.

This Docker image contains a great number of settings, to allow you to fully customize your LineageOS build. Here you can find all of them, with the default values between the brackets.

TL;DR - go to the Examples

Fundamental settings

The two fundamental settings are:

  • BRANCH_NAME (lineage-16.0): LineageOS branch, see the branch list here (multiple comma-separated branches can be specified)
  • DEVICE_LIST: comma-separated list of devices to build

Running a build with only these two set will create a ZIP file almost identical to the LineageOS official builds, just signed with the test keys.

When multiple branches are selected, use DEVICE_LIST_<BRANCH_NAME> to specify the list of devices for each specific branch (see the examples).

GMS / microG

To include microG (or possibly the actual Google Mobile Services) in your build, LineageOS expects certain Makefiles in vendor/partner_gms and variable WITH_GMS set to true.

This repo contains the common packages included for official lineageos4microg builds. To include it in your build, create an XML (the name is irrelevant, as long as it ends with .xml) in the /home/user/manifests folder with this content:

<?xml version="1.0" encoding="UTF-8"?>
    <project path="vendor/partner_gms" name="lineageos4microg/android_vendor_partner_gms" remote="github" revision="master" />

Additional custom apps

If you wish to add other apps to your ROM, you can include a repository with source code or prebuilt APKs. For prebuilt apks, see the android_vendor_partner_gms repository for examples on how the Android.mk file should look like.

Include the repo with another manifest file like this:

<?xml version="1.0" encoding="UTF-8"?>
  <project name="your-github-user/your-repo" path="prebuilts/my-custom-apps" remote="github" revision="master" />

And when starting the build, set the CUSTOM_PACKAGES variable to a list of app names (defined by LOCAL_MODULE in Android.mk) separated by spaces.

Signature spoofing

There are two options for the signature spoofing patch required for microG:

  • "Original" patches
  • Restricted patches

With the "original" patch the FAKE_SIGNATURE permission can be granted to any user app: while it may seem handy, this is considered dangerous by a great number of people, as the user could accidentally give this permission to rogue apps.

A more strict option is the restricted patch, where the FAKE_SIGNATURE permission can be obtained only by privileged system apps, embedded in the ROM during the build process.

The signature spoofing patch can be optionally included with:

  • SIGNATURE_SPOOFING (no): yes to use the original patch, restricted for the restricted one, no for none of them

If in doubt, use restricted: note that packages that requires the FAKE_SIGNATURE permission must be included in the build as system apps (e.g. as part of GMS or CUSTOM_PACKAGES)

Proprietary files

Some proprietary files are needed to create a LineageOS build, but they're not included in the LineageOS repo for legal reasons. You can obtain these blobs in three ways:

The third way is the easiest one and is enabled by default; if you're OK with that just move on, otherwise set INCLUDE_PROPRIETARY (true) to false and manually provide the blobs (not explained in this guide).

Over the Air updates

To enable OTA for you builds, you need to run a server that speaks the protocol understood by the LineageOS updater app and provide the URL to this server as OTA_URL variable for the build.

One implementation is LineageOTA, which is also available as Docker image. Follow these steps to prepare your builds for OTA:

  • Run the Docker image julianxhokaxhiu/lineageota
    • Port 80 exposed to the internet (might want to add an HTTPS reverse proxy)
    • The /srv/zips directory/volume of the CICD image mounted at /var/www/html/builds/full (can be read-only)
  • Set environment variables when building
    • ZIP_SUBDIR to false
    • OTA_URL to the address of the OTA server, with /api appended

If you don't setup a OTA server you won't be able to update the device from the updater app (but you can still update it manually with the recovery of course).


By default, builds are signed with the Android test keys. If you want to sign your builds with your own keys (highly recommended):

  • SIGN_BUILDS (false): set to true to sign the builds with the keys contained in /srv/keys; if no keys are present, a new set will be generated

Other settings

Other useful settings are:

  • CCACHE_SIZE (50G): change this if you want to give more (or less) space to ccache
  • WITH_SU (false): set to true to embed su in the build (note that, even when set to false, you can still enable root by flashing the su installable ZIP). This is only for lineage version 16 and below.
  • RELEASE_TYPE (UNOFFICIAL): change the release type of your builds
  • BUILD_TYPE (userdebug): type of your builds, see Android docs
  • BUILD_OVERLAY (false): normally each build is done on the source tree, then the tree is cleaned with mka clean. If you want to be sure that each build is isolated from the others, set BUILD_OVERLAY to true (longer build time). Requires --cap-add=SYS_ADMIN.
  • LOCAL_MIRROR (false): change this to true if you want to create a local mirror of the LineageOS source (> 200 GB)
  • CRONTAB_TIME (now): instead of building immediately and exit, build at the specified time (uses standard cron format)
  • ZIP_SUBDIR (true): Move the resulting zips to $ZIP_DIR/$codename instead of $ZIP_DIR/
  • PARALLEL_JOBS: Limit the number of parallel jobs to run (-j for repo sync and mka). By default, the build system should match the number of parallel jobs to the number of cpu cores on your machine. Reducing this number can help keeping it responsive for other tasks.
  • RETRY_FETCHES: Set the number of retries for the fetch during repo sync. By default, this value is unset (default repo sync retry behavior). Positive values greater than 0 are allowed.

The full list of settings, including the less interesting ones not mentioned in this guide, can be found in the Dockerfile.


You also have to provide Docker some volumes, where it'll store the source, the resulting builds, the cache and so on. The volumes are:

  • /srv/src, for the LineageOS sources
  • /srv/zips, for the output builds
  • /srv/logs, for the output logs
  • /srv/ccache, for the ccache
  • /srv/local_manifests, for custom manifests (optional)
  • /srv/userscripts, for the user scripts (optional)

When SIGN_BUILDS is true

  • /srv/keys, for the signing keys

When BUILD_OVERLAY is true

  • /srv/tmp, for temporary files

When LOCAL_MIRROR is true:

  • /srv/mirror, for the LineageOS mirror


Build for river (lineage-18.1, officially supported), test keys, no patches

docker run \
    -e "BRANCH_NAME=lineage-18.1" \
    -e "DEVICE_LIST=river" \
    -v "/home/user/lineage:/srv/src" \
    -v "/home/user/zips:/srv/zips" \
    -v "/home/user/logs:/srv/logs" \
    -v "/home/user/cache:/srv/ccache" \

Build for bacon (lineage-17.1, officially supported), custom keys, restricted signature spoofing with integrated microG and FDroid

docker run \
    -e "BRANCH_NAME=lineage-17.1" \
    -e "DEVICE_LIST=bacon" \
    -e "SIGN_BUILDS=true" \
    -e "SIGNATURE_SPOOFING=restricted" \
    -e "WITH_GMS=true" \
    -v "/home/user/lineage:/srv/src" \
    -v "/home/user/zips:/srv/zips" \
    -v "/home/user/logs:/srv/logs" \
    -v "/home/user/cache:/srv/ccache" \
    -v "/home/user/keys:/srv/keys" \
    -v "/home/user/manifests:/srv/local_manifests" \

If there are already keys in /home/user/keys they will be used, otherwise a new set will be generated before starting the build (and will be used for every subsequent build).

The microG and FDroid packages are not present in the LineageOS repositories, and must be provided e.g. through android_vendor_partner_gms.

Build for four devices on lineage-17.1 and lineage-18.1 (officially supported), custom keys, restricted signature spoofing with integrated microG and FDroid, custom OTA server

docker run \
    -e "BRANCH_NAME=lineage-17.1,lineage-18.1" \
    -e "DEVICE_LIST_LINEAGE_17_1=bacon,oneplus2" \
    -e "DEVICE_LIST_LINEAGE_18_1=river,lake" \
    -e "SIGN_BUILDS=true" \
    -e "SIGNATURE_SPOOFING=restricted" \
    -e "WITH_GMS=true" \
    -e "OTA_URL=https://api.myserver.com/" \
    -v "/home/user/lineage:/srv/src" \
    -v "/home/user/zips:/srv/zips" \
    -v "/home/user/logs:/srv/logs" \
    -v "/home/user/cache:/srv/ccache" \
    -v "/home/user/keys:/srv/keys" \
    -v "/home/user/manifests:/srv/local_manifests" \

Build for a6000 (not officially supported), custom keys, restricted signature spoofing with integrated microG and FDroid

As there is no official support for this device, we first have to include the sources in the source tree through an XML in the /home/user/manifests folder; from this thread we get the links of:

Then, with the help of lineage.dependencies from the device tree and the common tree we create an XML /home/user/manifests/a6000.xml with this content:

<?xml version="1.0" encoding="UTF-8"?>
  <project name="dev-harsh1998/android_device_lenovo_a6000" path="device/lenovo/a6000" remote="github" />
  <project name="dev-harsh1998/android_device_lenovo_msm8916-common" path="device/lenovo/msm8916-common" remote="github" />
  <project name="dev-harsh1998/kernel_lenovo_msm8916" path="kernel/lenovo/a6000" remote="github" />
  <project name="dev-harsh1998/proprietary-vendor_lenovo" path="vendor/lenovo" remote="github" />
  <project name="LineageOS/android_device_qcom_common" path="device/qcom/common" remote="github" />

We also want to include microG so, like before, create an XML (for example /home/user/manifests/microg.xml) with this content:

<?xml version="1.0" encoding="UTF-8"?>
    <project path="vendor/partner_gms" name="lineageos4microg/android_vendor_partner_gms" remote="github" revision="master" />

We also set INCLUDE_PROPRIETARY=false, as the proprietary blobs are already provided by the repo https://github.com/dev-harsh1998/prorietary_vendor_lenovo (so we don't have to include the TheMuppets repo).

Now we can just run the build like it was officially supported:

docker run \
    -e "BRANCH_NAME=lineage-15.1" \
    -e "DEVICE_LIST=a6000" \
    -e "SIGN_BUILDS=true" \
    -e "SIGNATURE_SPOOFING=restricted" \
    -e "WITH_GMS=true" \
    -e "INCLUDE_PROPRIETARY=false" \
    -v "/home/user/lineage:/srv/src" \
    -v "/home/user/zips:/srv/zips" \
    -v "/home/user/logs:/srv/logs" \
    -v "/home/user/cache:/srv/ccache" \
    -v "/home/user/keys:/srv/keys" \
    -v "/home/user/manifests:/srv/local_manifests" \

Web Site text

The following should be published on the LineageOS for microG website. It is included here until the website can be updated

How do I install the LineageOS for MicroG ROM

Follow the LineageOS installation instructions for your device, which can be accessed from the LineageOS Devices wiki pages. If the LineageOS installation instructions require or refer to any .img files, these images can be obtained by unzipping the -images.zip file mentioned in the previous section.

'Clean' and 'dirty' flashing

A 'clean' flash is when the data partition is wiped and/or formatted before the ROM is installed. This will remove all user-installed apps and data. It is sometimes referred to as a 'fresh installation'.

A 'dirty flash' is when the data partition is not wiped and/or formatted before the ROM is installed. Normally this will result in all user-installed apps and data still being present after the installation.

Newer versions of the LineageOS for MicroG ROM can usually be 'dirty flashed' over older versions with the same Android version.

Dirty flashing is sometimes possible over

  • older versions of the LineageOS for MicroG ROM with an earlier Android version**;
  • the official LineageOS ROM (without microG)

In both these cases, problems may be encountered with app permissions, both for user-installed apps and for the pre-installed apps. These problems can sometimes be fixed by manually changing the app permissions.

If you are 'dirty' flashing, it is a good idea to backup your user-installed apps and data in case the 'dirty' flash fails.

Troubleshooting and support

The LineageOS for MicroG project is not in a position to offer much by way of technical support:

  • the number of active volunteer maintainers / contributors is very small, and we spend what time we have trying to ensure that the process of making regular builds keeps going. We can generally investigate problems with the build tools, but not with the ROM itself;
  • we don't have access to any devices for testing / debugging

The project issue tracker is mostly for tracking problems with the Docker build tool. It is not intended for tracking problems with installing or running the LineageOS for MicroG ROM. If you run into such problems, our advice is to work through the following steps to see if they help. (Make a backup of your user apps & data first):

  • full power off and restart
  • factory reset
  • format data partition
  • install the most recent LineageOS for MicroG build for your device, from here following the LOS installation instructions.
  • install the latest official LineageOS build from here

For any problems, with building, installing, or running LineageOS for MicroG, we recommend that you ask for help in the XDA Forum thread or in device specific XDA forum threads. The LineageOS for MicroG forum thread is not maintained by us, but there are many knowledgeable contributors there, who build and run the LineageOS for MicroG ROM on a wide variety of devices.

LineageOS for microG: Project Scope & Objectives

As the website says, the LineageOS for microG project is a

LineageOS unofficial fork with built-in microG gapps implementation

The prime objectives of the project are to:

  • deliver regular builds of the project for all the phones and tablets[1] currently supported officially by LOS;
  • create and maintain the source code, tools, and computing resources needed:
    • to make the builds;
    • to make the builds available for download, for manual and OTA installation.

Another - less central - objective is to allow other projects and individuals to use our source code and tools (though not currently our computing resources) to make and maintain their own builds:

  • of L4M, 'vanilla' LOS, and / or other LOS-based custom ROMs;
  • for other devices, whether or not supported officially.


The project has two main 'upstream` projects:

Like LineageOS, the project also uses 'TheMuppets` github and gitlab repos as the source for device-specific vendor binary blobs.

The main work of the project is to integrate the upstream components and build them into the ROM images we make available.

Project Github repositories

The project has two main public repositories on GitHub:

  • docker-lineage-cicd The Docker image used by the project to make the regular builds, along with a README.md explaining how it can be used. The Docker images is rebuilt and pushed to DockerHub automatically when changes are pushed to the master branch
  • android_vendor_partner_gms The pre-built components from MicroG, along with makefiles for easy integration in the Android build system. The pre-built components are pulled automatically from the MicroG releases.

Project deliverables

  1. The device-specific ROM zip files.
  2. Device-specific -images.zip files containing any .img files that are needed for installing or updating the ROM zip file (e.g. boot.img, recovery.img).
  3. The Docker image used to make the builds, including the (limited) documentation in the README.md.

The ROM zips and other device-specific files are made available in sub-directories on the download server.

The Docker image is pushed to DockerHub.

Build Targets and Frequency

We build for the same devices as LineageOS using their list of build targets as the input to our build run.

We currently make builds monthly, starting on the first day of the month. The devices included in a build run are defined by the content of the LOS target list at the point the build run starts. Our monthly build run takes 15-16 days to complete. You can see the current status of the build in the dedicated matrix room

If builds for any devices fail during a build run, we will try the build again after the main build run has completed. If you do not see a new build for your device when you expect it, please check whether the build failure was reported in the matrix room. If it was, there is no need to report it - we will deal with it! If the failure was not reported in the matrix room, then please report it in our issue tracker or in the XDA Forums thread

Project Scope

The following items are explicitly not within the scope of the project

  • Changes to, or forks of, upstream components, except where necessary for the correct operation of the integrated components. At present, this means only the signature spoofing patches that are needed for the correct operation of the MicroG software components (see Note 1)
  • Maintaining, supporting or documenting the tools or binary files, needed for installation of our ROMs. This is within the scope of the LineageOS upstream, which either builds and makes available the necessary tools and files, or links to other projects (e.g. TWRP) which provide them

Project Status

The project is currently in a fairly stable state:

  • we are (mostly) achieving our objective of delivering monthly builds
  • the only essential work that is ongoing is to
    • monitor the delivery process, to fix any problems that may occur, and to make any changes that are needed to ensure that the problems do not recur
    • to make any changes needed when upstreams make changes. In particular, when LineageOS introduces support for a new Android version and / or drops support for older Android versions

The project is therefore - in the opinion of the currently active maintainers - essentially 'feature complete' and in 'maintenance' mode. The only change that we believe might significantly improve the project is to support other classes of Android devices, specifically

  • Minimal & Android TV devices (see Note 2)
  • Treble-capable devices which are not officially supported by LOS. As has recently been suggested building for the lineage_gsi target would make our builds available for and usable on these devices.

Issue Reporting & Tracking

Our public github repos both have issue trackers, where any github user can create new issues. They are primarily intended for

  • tracking problems with the components owned by the repos, i.e. the Docker image, and our integration of the microG components.
  • asking questions about how to use the components
  • suggesting improvements to those components e.g.
    • ways in which the docker image could be changed to make the build process more efficient, or less error-prone
    • how our limited documentation (primarily the README.md) could be improved

They are not intended for

  • problems 'owned' by the upstream projects (see Note 3) e.g incorrect functionality, or requests for new or different functionality in
    • apps which are 'built-in' to LineageOS
    • microG components (unless the incorrect functionality is caused by our integration of those components)
  • problems which are out of scope (see above)
  • providing support for users of our ROMs (see below)
  • requests for new features in our components (see Note 4). As mentioned above, we believe the project is 'feature complete', and the project does not have the time and / or resources to expand its scope, even if we thought such expansion was desirable. We will consider any such feature requests (when / if we have the time to do so), but the answer is likely to be negative.

One area where we know improvements can be made is in showing the progress (or lack of progress) in addressing reported issues:

  • currently an issue is either 'Open' or 'Closed'
  • no indication of whether 'Open' issues will be fixed or not
  • no visibility of the priority of open issues, or when or in what order they will be addressed
  • no indication of whether 'Closed' issues were fixed or not before closure

Some gradual changes are in hand to address this.

User Support

The project and the currently active maintainers do not have the time or resources to provide 'official' support for users of our ROMs. Fortunately, support and 'self-help' is available from the user community, in particular in the LineageOS for microG' XDA Forums thread.

Upstream projects have their own channels for supporting users.


  1. If such changes are needed, we will try to provide patches or Pull Requests to the upsteam components. We will only maintain our changes ourselves if the upstreams will not accept our changes
  2. L4M does not currently support building for Minimal or Android TV devices, even when those devices are supported by LOS
  3. This class of problem usually includes device-specific issues: we have no device-specific code, it all comes from upstream
  4. Any new issues or feature requests are more likely to be received positively if they are accompanied by code changes (in patches or - preferred - in Pull Requests) to fix the issue or implement the change. However, such changes will not be accepted just because code changes are provided.