tomevault-io LineageOS Development
This skill covers LineageOS custom ROM development - from syncing sources to building and contributing.
Getting Started
Initialize Source
mkdir ~/lineage && cd ~/lineage
# Install repo (if needed)
mkdir -p ~/.bin
curl https://storage.googleapis.com/git-repo-downloads/repo > ~/.bin/repo
chmod a+x ~/.bin/repo
export PATH="$HOME/.bin:$PATH"
# Init LineageOS 21 (Android 14)
repo init -u https://github.com/LineageOS/android.git -b lineage-21.0 --git-lfs
# Sync
repo sync -c -j$(nproc) --force-sync --no-tags --no-clone-bundle
Build Commands
# Setup environment
source build/envsetup.sh
# Setup device (syncs device repos too)
breakfast <device>
# Build flashable ZIP
brunch <device>
# Or separately:
breakfast <device>
mka bacon
# Output: out/target/product/<device>/lineage-21.0-*-UNOFFICIAL-<device>.zip
Essential Commands
| Command | Purpose |
|---|---|
breakfast <device> |
Setup device + sync dependencies |
brunch <device> |
breakfast + full build |
mka bacon |
Build flashable ZIP |
mka bootimage |
Build kernel only |
mka systemimage |
Build system only |
repopick <change> |
Cherry-pick from Gerrit |
Device Trees
Required Files
device/<vendor>/<device>/
├── lineage_<device>.mk # Product makefile
├── lineage.dependencies # Repo dependencies
├── vendorsetup.sh # Add to lunch
├── BoardConfig.mk # Hardware config
├── device.mk # Packages and configs
└── extract-files.sh # Vendor blob extraction
lineage_.mk
# Inherit device
$(call inherit-product, device/vendor/device/device.mk)
# Inherit LineageOS common
$(call inherit-product, vendor/lineage/config/common_full_phone.mk)
PRODUCT_NAME := lineage_device
PRODUCT_DEVICE := device
PRODUCT_BRAND := Vendor
PRODUCT_MODEL := Device Name
PRODUCT_MANUFACTURER := Vendor
lineage.dependencies
[
{
"repository": "android_kernel_vendor_device",
"target_path": "kernel/vendor/device"
},
{
"repository": "android_device_vendor_device-common",
"target_path": "device/vendor/device-common"
},
{
"repository": "proprietary_vendor_device",
"target_path": "vendor/device"
}
]
repopick - Cherry-picking from Gerrit
# Single change
repopick 12345
# Multiple changes
repopick 12345 12346 12347
# By topic
repopick -t feature-topic
# With dependencies
repopick -Q 12345
# Force overwrite local changes
repopick -f 12345
# Show what would be picked
repopick -n 12345
Find Change Numbers
- Go to
https://review.lineageos.org - Search for changes
- Change number is in the URL or displayed
Vendor Blobs
Extract from Device
cd device/vendor/device
./extract-files.sh
Extract from OTA/Factory Image
./extract-files.sh ~/Downloads/ota.zip
proprietary-files.txt Format
# Audio HAL
vendor/lib64/hw/audio.primary.platform.so
vendor/etc/audio_policy_configuration.xml
# With destination path
vendor/lib64/lib.so:vendor/lib64/libfoo.so
# From another device
vendor/lib64/lib.so|other_device
LineageOS Features
Trust Interface
Security dashboard showing device integrity:
# device.mk
PRODUCT_PACKAGES += \
LineageTrust
LiveDisplay
Hardware-accelerated display tuning:
PRODUCT_PACKAGES += \
lineage.livedisplay@2.0-service-sdm
Styles / Themes
System theming support:
PRODUCT_PACKAGES += \
ThemePicker
Key Directories
| Path | Purpose |
|---|---|
vendor/lineage/ |
LineageOS additions |
lineage-sdk/ |
LineageOS SDK |
device/<vendor>/<device>/ |
Device tree |
kernel/<vendor>/<device>/ |
Kernel source |
vendor/<vendor>/ |
Proprietary blobs |
Contributing
Setup Gerrit Access
git config --global review.review.lineageos.org.username <username>
Submit Change
# Create branch
repo start my-feature .
# Make changes
git add -A
git commit -m "subsystem: Short description
Detailed explanation.
Change-Id: <auto-generated>"
# Push for review
git push ssh://<username>@review.lineageos.org:29418/<project> HEAD:refs/for/<branch>
Commit Message Format
subsystem: Short description
Longer explanation wrapped at 72 characters.
Explain why, not what.
Change-Id: I1234567890abcdef...
Common Issues
Breakfast Fails - Missing Repos
# Re-sync device tree
repo sync device/vendor/device kernel/vendor/device vendor/device
Build Fails - SELinux
# Find denials
adb shell dmesg | grep "avc: denied"
# Generate policy (on host)
adb shell dmesg | audit2allow -p out/target/product/<device>/root/sepolicy
Missing Blobs
Check logcat for:
E linker: cannot find symbol...
E ServiceManager: Could not find service...
Add missing files to proprietary-files.txt and re-extract.
Quick Reference
# Full workflow
source build/envsetup.sh
breakfast cheeseburger
brunch cheeseburger
# Just kernel
mka bootimage
# Cherry-pick fix
repopick 12345
# Sync everything
repo sync -c -j$(nproc)
# Sync one project
repo sync packages/apps/Settings
# Clean build
m clean && brunch <device>
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