On Windows, the Razor server correctly creates the pid file with
`FileAccess.Write` and `FileOptions.DeleteOnClose`. This requires a share mode
of `FileShare.Write | FileShare.Delete` to open. However, the
`dotnet build-server shutdown` command was opening the file with
`FileShare.Read`. As a result, an `IOException` was being thrown and was not
handled.
This change first opens the file with the appropriate share access and also
properly handles a failure to access or read the contents of the pid file.
Additionally, an integration test was added to test that Razor server shutdown
works as expected.
Fixes#9158.
Previously, Razor server discovery for the `build-server shutdown` command was
implemented by invoking MSBuild on a project file in the current directory to
evaluate the path to the Razor server dll. This was problematic since it would
only discover a single running Razor server instance and required that the user
run the `build-server shutdown` command from a specific location.
Razor's server now writes a "pid file" to a well-known location
(`~/.dotnet/pids/build`) which the command can now enumerate to discover, and
shutdown, the running Razor servers.
This commit changes the Razor server discovery to use the pid files and removes
the requirement that users need to run the command in specific directories to
work.
Fixes#9084.
This commit implements the `buildserver shutdown` command that can be used to
shutdown MSBuild, VB/C# compiler, and Razor build servers.
By default, all three build servers are shut down. Options can be passed to
shut down a subset of the build servers.
Fixes#8185.
