# Building a Mobian Image for the Pixel 3a

## Prerequisites

Cloning the repositories

Kernel: https://salsa.debian.org/erebion/sdm-670-linux

Mobian Recipes does not have the changes merged, as the kernel is not yet part of Mobian: https://salsa.debian.org/Mobian-team/mobian-recipes/-/merge_requests/113

Take my temporary fork of Mobian Recipes instead, for now: https://salsa.debian.org/erebion/mobian-recipes/-/tree/erebion/sargo-build?ref_type=heads

The fork will be maintained until there are official Mobian images for the Pixel 3a.

## Compiling the Kernel

First `cd` to the kernel repo.

Then:

```bash
gbp pq import # import the patches to a patch-queue branch with the patches applied
ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make defconfig sdm845.config sdm670.config usb-gadget.config # make kernel config, usb-gadget ist required for SSH via USB Cable
ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j$(nproc) bindeb-pkg # make Kernel deb (one directory level up)
```

## Building the Image

First `cd` to the Mobian repo.

Copy the kernel deb to `devices/qcom/packages`, so that it gets installed onta the image we are about to build.

Temporary workarounds:

- Comment `loupe` in `include/packages-phosh.yaml` as that is currently not available in the repo. The image viewer can be installed later.
- Comment `mobian-phosh` because of a broken dependency and insert `phosh-core`, the metapackage just installs things like an XMPP client and nothing important we couldn't install later.
- Add your SSH authorized keys file to `overlays/ssh/authorized_keys`, important so you can log in later

```bash
./build.sh -t qcom -s -u mobian | tee mobian-build.log # -s for SSH, which we need later
```

(If you replace `mobian` with your own username, you will have to use that one for SSH later, of course)

Wait. It takes a while. Make sure the internet connection is stable, as the build fails if it cannot download all packages successfully.

Note: Your SSH Host Keys currently get generated while building the image, please don't give your image to anyone else.

## Flash to device:

```
fastboot --set-active --slot a
fastboot flash boot_a mobian-qcom-phosh-20240614.boot-bonito-sdc.img
fastboot flash userdata mobian-qcom-phosh-20240614.rootfs.img 
fastboot erase dtbo
```

Boot up the device. Connect it via USB.

## Temporary manual changes

Documented in README.md in this repo.