Invocation contexts

IInvocationContext is the context in which toolshed executes commands, it provides shell functions, variable read/write, permission checking, and error reporting.

Best practices

• If your command temporarily sets a variable for executing a block, one should implement a wrapper context that provides the variable within it instead of setting the variable on the existing context. This avoids variable leaking.
• CheckInvokable should not be overriden without VERY good reason, as it is a security boundary.
• Do not discard errors, if you don’t have a way to handle the error nicely it should likely be thrown as an exception to ensure it’s seen by someone.