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++++
+title = "Building on Android"
+order = 3
+template = "second-edition/extra.html"
++++
+
+I finally managed to get `blog_os` building on my Android phone using [termux](https://termux.com/). This post explains the necessary steps to set it up.
+
+
+
+
+### Install Termux and Nightly Rust
+
+First, install [termux](https://termux.com/) from the [Google Play Store](https://play.google.com/store/apps/details?id=com.termux) or from [F-Droid](https://f-droid.org/packages/com.termux/). After installing, open it and perform the following steps:
+
+- Install fish shell, set as default shell, and launch it:
+ ```
+ pkg install fish
+ chsh -s fish
+ fish
+ ```
+
+ This step is of course optional. However, if you continue with bash you will need to adjust some of the following commands to bash syntax.
+
+- Install some basic tools:
+ ```
+ pkg install wget tar
+ ```
+
+- Add the [community repository by its-pointless](https://wiki.termux.com/wiki/Package_Management#By_its-pointless_.28live_the_dream.29:):
+ ```
+ wget https://its-pointless.github.io/setup-pointless-repo.sh
+ bash setup-pointless-repo.sh
+ ```
+
+- Install cargo and a nightly version of rustc:
+ ```
+ pkg install rustc cargo rustc-nightly
+ ```
+
+- Prepend the nightly rustc path to your `PATH` in order to use nightly (fish syntax):
+ ```
+ set -U fish_user_paths $PREFIX/opt/rust-nightly/bin/ $fish_user_paths
+ ```
+
+Now `rustc --version` should work and output a nightly version number.
+
+### Install Git and Clone blog_os
+
+We need something to compile, so let's download the `blog_os` repository:
+
+- Install git:
+ ```
+ pkg install git
+ ```
+
+- Clone the `blog_os` repository:
+ ```
+ git clone https://github.com/phil-opp/blog_os.git
+ ```
+
+If you want to clone/push via SSH, you need to install the `openssh` package: `pkg install openssh`.
+
+### Install Xbuild and Bootimage
+
+Now we're ready to install `cargo xbuild` and `bootimage`
+
+- Run `cargo install`:
+ ```
+ cargo install cargo-xbuild bootimage
+ ```
+
+- Add the cargo bin directory to your `PATH` (fish syntax):
+ ```
+ set -U fish_user_paths ~/.cargo/bin/ $fish_user_paths
+ ```
+
+Now `cargo xbuild` and `bootimage` should be available. It does not work yet because `cargo xbuild` needs access to the rust source code. By default it tries to use rustup for this, but we have no rustup support so we need a different way.
+
+### Providing the Rust Source Code
+
+The Rust source code corresponding to our installed nightly is available in the [`its-pointless` repository](https://github.com/its-pointless/its-pointless.github.io):
+
+- Download a tar containing the source code:
+ ```
+ wget https://github.com/its-pointless/its-pointless.github.io/raw/master/rust-src-nightly.tar.xz
+ ```
+
+- Extract it:
+ ```
+ tar xf rust-src-nightly.tar.xz
+ ```
+
+- Set the `XARGO_RUST_SRC` environment variable to tell cargo-xbuild the source path (fish syntax):
+ ```
+ set -Ux XARGO_RUST_SRC ~/rust-src-nightly/rust-src/lib/rustlib/src/rust/src
+ ```
+
+Now cargo-xbuild should no longer complain about a missing `rust-src` component. However it will throw an I/O error after building the sysroot. The problem is that the downloaded Rust source code has a different structure than the source provided by rustup. We can fix this by adding a symbolic link:
+
+```
+ln -s ~/../usr/opt/rust-nightly/bin ~/../usr/opt/rust-nightly/lib/rustlib/aarch64-linux-android/bin
+```
+
+Now `cargo xbuild --target x86_64-blog_os.json` and `bootimage build` should both work!
+
+I couldn't get QEMU to run yet, so you won't be able to run your kernel. If you manage to get it working, please tell me :).
diff --git a/blog/templates/second-edition/index.html b/blog/templates/second-edition/index.html
index 3ef7c887..a998f24c 100644
--- a/blog/templates/second-edition/index.html
+++ b/blog/templates/second-edition/index.html
@@ -70,6 +70,18 @@
You are viewing the second edition of “Writing an OS in Rust”, which is still in progress. The first edition has more content, but is no longer updated. We try our best to incorporate the missing content soon.
+
+{% set extra = get_section(path = "second-edition/extra/_index.md") %}
+
{{ extra.title }}
+
+ {% for subsection in extra.subsections|reverse %}
+
+
+
+### Install Termux and Nightly Rust
+
+First, install [termux](https://termux.com/) from the [Google Play Store](https://play.google.com/store/apps/details?id=com.termux) or from [F-Droid](https://f-droid.org/packages/com.termux/). After installing, open it and perform the following steps:
+
+- Install fish shell, set as default shell, and launch it:
+ ```
+ pkg install fish
+ chsh -s fish
+ fish
+ ```
+
+ This step is of course optional. However, if you continue with bash you will need to adjust some of the following commands to bash syntax.
+
+- Install some basic tools:
+ ```
+ pkg install wget tar
+ ```
+
+- Add the [community repository by its-pointless](https://wiki.termux.com/wiki/Package_Management#By_its-pointless_.28live_the_dream.29:):
+ ```
+ wget https://its-pointless.github.io/setup-pointless-repo.sh
+ bash setup-pointless-repo.sh
+ ```
+
+- Install cargo and a nightly version of rustc:
+ ```
+ pkg install rustc cargo rustc-nightly
+ ```
+
+- Prepend the nightly rustc path to your `PATH` in order to use nightly (fish syntax):
+ ```
+ set -U fish_user_paths $PREFIX/opt/rust-nightly/bin/ $fish_user_paths
+ ```
+
+Now `rustc --version` should work and output a nightly version number.
+
+### Install Git and Clone blog_os
+
+We need something to compile, so let's download the `blog_os` repository:
+
+- Install git:
+ ```
+ pkg install git
+ ```
+
+- Clone the `blog_os` repository:
+ ```
+ git clone https://github.com/phil-opp/blog_os.git
+ ```
+
+If you want to clone/push via SSH, you need to install the `openssh` package: `pkg install openssh`.
+
+### Install Xbuild and Bootimage
+
+Now we're ready to install `cargo xbuild` and `bootimage`
+
+- Run `cargo install`:
+ ```
+ cargo install cargo-xbuild bootimage
+ ```
+
+- Add the cargo bin directory to your `PATH` (fish syntax):
+ ```
+ set -U fish_user_paths ~/.cargo/bin/ $fish_user_paths
+ ```
+
+Now `cargo xbuild` and `bootimage` should be available. It does not work yet because `cargo xbuild` needs access to the rust source code. By default it tries to use rustup for this, but we have no rustup support so we need a different way.
+
+### Providing the Rust Source Code
+
+The Rust source code corresponding to our installed nightly is available in the [`its-pointless` repository](https://github.com/its-pointless/its-pointless.github.io):
+
+- Download a tar containing the source code:
+ ```
+ wget https://github.com/its-pointless/its-pointless.github.io/raw/master/rust-src-nightly.tar.xz
+ ```
+
+- Extract it:
+ ```
+ tar xf rust-src-nightly.tar.xz
+ ```
+
+- Set the `XARGO_RUST_SRC` environment variable to tell cargo-xbuild the source path (fish syntax):
+ ```
+ set -Ux XARGO_RUST_SRC ~/rust-src-nightly/rust-src/lib/rustlib/src/rust/src
+ ```
+
+Now cargo-xbuild should no longer complain about a missing `rust-src` component. However it will throw an I/O error after building the sysroot. The problem is that the downloaded Rust source code has a different structure than the source provided by rustup. We can fix this by adding a symbolic link:
+
+```
+ln -s ~/../usr/opt/rust-nightly/bin ~/../usr/opt/rust-nightly/lib/rustlib/aarch64-linux-android/bin
+```
+
+Now `cargo xbuild --target x86_64-blog_os.json` and `bootimage build` should both work!
+
+I couldn't get QEMU to run yet, so you won't be able to run your kernel. If you manage to get it working, please tell me :).
diff --git a/blog/templates/second-edition/index.html b/blog/templates/second-edition/index.html
index 3ef7c887..a998f24c 100644
--- a/blog/templates/second-edition/index.html
+++ b/blog/templates/second-edition/index.html
@@ -70,6 +70,18 @@
You are viewing the second edition of “Writing an OS in Rust”, which is still in progress. The first edition has more content, but is no longer updated. We try our best to incorporate the missing content soon.
+