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Build PowerShell on Linux

This guide will walk you through building PowerShell on Linux. We'll start by showing how to set up your environment from scratch.

Environment

These instructions are written assuming the Ubuntu 14.04 LTS, since that's the distro the team uses. The build module works on a best-effort basis for other distributions.

Git Setup

Using Git requires it to be set up correctly; refer to the Working with the PowerShell Repository, README, and Contributing Guidelines.

This guide assumes that you have recursively cloned the PowerShell repository and cded into it.

Toolchain Setup

We use the .NET Command-Line Interface (dotnet) to build the managed components, and CMake to build the native components. Install the following packages for the toolchain:

  • dotnet: Must be installed from the Start-PSBootstrap module as described below.
  • cmake
  • make
  • g++

Unfortunately, the apt-get feed for dotnet has been deprecated, and the latest version is only distributed in the form of three separate packages, which require manual dependency resolution.

Installing the toolchain is as easy as running Start-PSBootstrap in PowerShell. Of course, this requires a self-hosted copy of PowerShell on Linux.

Fortunately, this is as easy as downloading and installing the package. The ./tools/download.sh script will also install the PowerShell package.

In Bash:

./tools/download.sh

powershell

You should now be in a powershell console host that is installed separately from any development copy you're about to build. Just import our module, bootstrap the dependencies, and build!

In PowerShell:

Import-Module ./build.psm1
Start-PSBootstrap

The Start-PSBootstrap function does the following:

  • Adds the LLVM package feed
  • Installs our dependencies combined with the dependencies of the .NET CLI toolchain via apt-get
  • Uninstalls any prior versions of .NET CLI
  • Downloads and installs the latest .NET CLI 1.0.0-preview3 SDK to ~/.dotnet

If you want to use dotnet outside of Start-PSBuild, add ~/.dotnet to your PATH environment variable.

.NET CLI

If you have any problems installing dotnet, please see their documentation.

The version of .NET CLI is very important; you need a recent build of 1.0.0 (not 1.0.1).

Previous installations of DNX, dnvm, or older installations of .NET CLI can cause odd failures when running. Please check your version and uninstall prior any prior versions.

Build using our module

We maintain a PowerShell module with the function Start-PSBuild to build PowerShell. Since this is PowerShell code, it requires self-hosting. If you have followed the toolchain setup section above, you should have powershell installed.

If you cannot or do not want to self-host, Start-PSBuild is just a convenience; you can execute each step of the build process yourself in Bash; see Build manually below.

Import-Module ./build.psm1
Start-PSBuild

Congratulations! If everything went right, PowerShell is now built. The Start-PSBuild script will output the location of the executable:

./src/powershell-unix/bin/Linux/netcoreapp1.0/ubuntu.14.04-x64/powershell.

You should now be running the powershell that you just built, if your run the above executable. You can run our cross-platform Pester tests with Start-PSPester, and our xUnit tests with Start-PSxUnit.

Build manually

The following goes into detail about what Start-PSBuild does.

Build the native library

The libpsl-native.so library consists of native functions that CorePsPlatform.cs P/Invokes.

pushd src/libpsl-native
cmake -DCMAKE_BUILD_TYPE=Debug .
make -j
make test
popd

This library will be emitted in the src/powershell-unix project, where dotnet consumes it as "content" and thus automatically deploys it.

Build the managed projects

The powershell project is the .NET Core PowerShell host. It is the top level project, so dotnet build transitively builds all its dependencies, and emits a powershell executable. The --configuration Linux flag is necessary to ensure that the preprocessor definition LINUX is defined (see issue #673).

dotnet restore
cd src/powershell-unix
dotnet build --configuration Linux

The executable will be in ./bin/[configuration]/[framework]/[rid]/[binary name], where our configuration is Linux, framework is netcoreapp1.0, runtime identifier is ubuntu.14.04-x64, and binary name is powershell. The function Get-PSOutput will return the path to the executable; thus you can execute the development copy via & (Get-PSOutput).

For deploying PowerShell, dotnet publish will emit a publish directory that contains a flat list of every dependency required for PowerShell. This can be copied to, for example, /usr/local/share/powershell or packaged.