Instead of using `dotnet publish`, we can use `dotnet build` and the new
`netcoreapp1.0` framework with a new dependency on
`Microsoft.NETCore.App` to generate output that does not include the
runtime, but can be run anywhere (given the installation of the
runtime).
While we cannot yet adopt a dependency on the shared host until .NET
Core RTM, we are forced to switch to this system anyway because the
latest RC3 packages and CLI do not support `netstandardapp1.5`. See
dotnet/cli#2482.
Thus we're in an in-between state where we have to use `netcoreapp1.0`,
but cannot use `"Microsoft.NETCore.App": { "type": "platform" }` to
utilize the shared host, as we need to continue to ship our host.
Without specifying "platform", we retain the status quo with respect to
build steps and outputs.
Additionally, there is no longer a good reason to use the RC3 packages,
and it has been advised we switch to RC2 since the
`Microsoft.NETCore.App` is only available for RC2. We must update
packages because our current version can no longer be debugged.
The latest xUnit packages fix the "could not resolve coreclr path"
problem we were having. To resolve all dependencies, the cli-deps feed
was replaced with the aspnet feeds.
However, the latest xUnit packages do not allow us to set the default
AssemblyLoadContext.
With the switch to `netstandardapp1.5` framework for the host, the xUnit
test runner broke. For `dotnet test` to work with the .NET Core xUnit
runner, it must continue to target `dnxcore50`. Fortunately, we can
import our project's framework, and make everything work again.
Also improved the `xunit.sh` script to check for dependencies.
All libraries now use the framework `netstandard1.5`, and import the
`dnxcore50` and `portable` frameworks. The app that is published,
Microsoft.PowerShell.Linux.Host, that is, the top-level dependency that
emits an executable, instead targets `netstandardapp1.5` and has a new
`runtimes` key so that .NET CLI's `restore` and `publish` commands know
which runtime implementations to resolve.
When switching to the new CLI, we needed to fix how we specified our
dependencies. In particular, the .NET CLI team helped me figure out how
to download packages that are reference assembly only on Linux, with
implementations on Windows. The result of this is the new `frameworks`
setup.
Additionally, we were incorrectly specifying our build dependencies;
that is, projects we also build (not packages). The solution was much
cleaner. We removed the `type: build` section and replaced it with the
version `1.0.0-*` that all our projects currently use.
The `project.json` files also had their names, descriptions,
indentation, and versions fixed.
The build scripts were simplified.
