Added pre-requisites for building native modules on linux and updated native-node-modules.md

docs/linux-requirements.md

@@ -0,0 +1,65 @@
+# Linux
+
+The native modules include support for features like searching in encrypted rooms and secure storage.
+Thus, skipping this step is fine, you just won't have those features in your build.
+
+**NOTE:** Instructions are for Debian-derived distros other distros should adapt them as appropriate.
+## Requirements to build native modules
+
+If you want to build native modules, make sure that the following tools are installed on your system.
+If they're not already installed on your system, you can run the following commands to install them:
+```
+sudo apt install pkg-config 
+sudo apt install pkgconf 
+sudo apt install libsecret-1-dev 
+```
+
+- [Node 14](https://nodejs.org)
+
+You can run the following commands to install Node 14:
+```
+curl -sL https://deb.nodesource.com/setup_14.x | sudo bash -
+sudo apt -y install nodejs
+```
+
+Verify the version of Node.js installed. (Latest version is preferred)
+```
+node -v
+```
+
+Install the Node dev tools and the yarn package manager using the following commands:
+```
+sudo apt -y install gcc g++ make
+curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+sudo apt update && sudo apt install yarn
+```
+
+Verify the version of Yarn installed. (Must be v1)
+```
+yarn -v
+```
+
+- [Python 3](https://www.python.org/downloads/)
+
+You can run the following commands to install Python 3:
+```
+sudo apt-get install python3.6
+python3 --version
+```
+
+- [Strawberry Perl](https://strawberryperl.com/)
+
+- [Rust](https://rustup.rs/)
+
+Run the following in your terminal, then follow the on-screen instructions.
+```
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+- [SQLCipher](https://www.zetetic.net/sqlcipher/)
+```
+sudo apt install sqlcipher
+sudo apt install libsqlcipher-dev
+```
+

docs/native-node-modules.md

@@ -18,12 +18,13 @@ when releasing.
 Install the pre-requisites for your system:
 
 * [Windows pre-requisites](https://github.com/vector-im/element-desktop/blob/develop/docs/windows-requirements.md)
-* Linux: TODO
+* [Linux pre-requisites](https://github.com/vector-im/element-desktop/blob/develop/docs/linux-requirements.md)
 * OS X: TODO
 
 Then optionally, [add seshat and dependencies to support search in E2E rooms](#adding-seshat-for-search-in-e2e-encrypted-rooms).
 
-Then, to build for an architecture selected automatically based on your system (recommended), run:
+Then, to build for an architecture selected automatically based on your system 
+(recommended), run:
 ```
 yarn run build:native
 ```
@@ -36,14 +37,24 @@ Seshat is a native Node module that adds support for local event indexing and
 full text search in E2E encrypted rooms.
 
 Since Seshat is written in Rust, the Rust compiler and related tools need to be
-installed before installing Seshat itself. To install Rust please consult the
-official Rust [documentation](https://www.rust-lang.org/tools/install).
+installed before installing Seshat itself. If you're running macOS, Linux, or 
+another Unix-like OS, to download Rustup and install Rust, run the following in
+your terminal, then follow the on-screen instructions.
+```
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+Or you can consult the official Rust [documentation](https://www.rust-lang.org/tools/install).
 
 Seshat also depends on the SQLCipher library to store its data in encrypted form
-on disk. You'll need to install it via your OS package manager.
+on disk. You'll need to install it via your OS package manager,on Debian/Ubuntu run:
+```
+sudo apt install sqlcipher
+sudo apt install libsqlcipher-dev
+```
 
-After installing the Rust compiler and SQLCipher, Seshat support can be added
-using yarn at the root of this project:
+After installing the Rust compiler and SQLCipher along with libsqlcipher, Seshat 
+support can be added using yarn at the root of this project:
 
     yarn add matrix-seshat