### Create the directories

As a first step, you'll have to create and enter a folder with the appropriate name
To do that, run these commands:

```bash
mkdir LineageOS
cd LineageOS
```

### To initialize your local repository, run this command:

```bash
repo init -u https://github.com/LineageOS/android.git -b lineage-22.2 --git-lfs
```


### Clone the Manifest to add necessary dependencies for gsi:

    git clone https://github.com/MisterZtr/treble_manifest.git .repo/local_manifests  -b 15-los-qpr2



### Afterwards, sync the source by running this command:

```bash
repo sync --force-sync --optimized-fetch --no-tags --no-clone-bundle --prune -j4
```


### Next, apply patches:

Copy the patches folder to rom folder and in rom folder

```
bash patches/apply-patches.sh .
```

## Generating Rom Makefile

Clone this repository, and then in device/phh/treble folder, run following commands:,

```
cd device/phh/treble
bash generate.sh lineage
```

Also, copy the files treble_arm64_bgN.mk and treble_arm64_bvN.mk to this folder


### Turn on caching to speed up build

You can speed up subsequent builds by adding these lines to your ~/.bashrc OR ~/.zshrc file:

```
export USE_CCACHE=1
export CCACHE_COMPRESS=1
export CCACHE_MAXSIZE=50G # 50 GB
``` 

## Compilation 

In ROM folder, for vanilla version:

```
. build/envsetup.sh
ccache -M 50G -F 0
lunch treble_arm64_bvN-bp1a-userdebug
make systemimage -j$(nproc --all)
```

For version with google services:

```
. build/envsetup.sh
ccache -M 50G -F 0
lunch treble_arm64_bgN-bp1a-userdebug
make systemimage -j$(nproc --all)
```


## Compress

After compilation,
If you want to compress the build, i recommend use [7-zip](https://aur.archlinux.org/packages/7-zip), for a fast and safe way
In rom folder,

```
cd out/target/product/tdgsi_arm64_ab
7zz a system.img.xz "system.img"
```