Starlark cannot load external script

puzzloholic · October 11, 2019, 12:09pm

Hi,

I try to use load statement from your example here https://github.com/drone/drone/issues/2585.

Gives this error

cannot load pipeline.star: starlark: cannot load external scripts

I already read from starlark docs, and it can be used for centralized pipeline execution

github.com

google/starlark-go/blob/master/doc/spec.md#load-statements

# Starlark in Go: Language definition

Starlark is a dialect of Python intended for use as a configuration
language.  A Starlark interpreter is typically embedded within a larger
application, and this application may define additional
domain-specific functions and data types beyond those provided by the
core language.  For example, Starlark is embedded within (and was
originally developed for) the [Bazel build tool](https://bazel.build),
and [Bazel's build language](https://docs.bazel.build/versions/master/starlark/language.html) is based on Starlark.

This document describes the Go implementation of Starlark
at go.starlark.net/starlark.
The language it defines is similar but not identical to
[the Java-based implementation](https://github.com/bazelbuild/bazel/blob/master/src/main/java/com/google/devtools/starlark/Starlark.java)
used by Bazel.
We identify places where their behaviors differ, and an
[appendix](#dialect-differences) provides a summary of those
differences.
We plan to converge both implementations on a single specification.

This file has been truncated. show original

Is it not implemented yet?

This is my files
.drone.star

load("pipeline.star",  "func")

def main(ctx):
  return {
    "kind": "pipeline",
    "name": "build",
    "steps": [
      {
        "name": "build",
        "image": "alpine",
        "commands": [
            "echo %s" % ctx,
        ]
      },
      func("test")
    ]
  }

pipeline.star

def main(var):
  return {
    "name": "test",
    "image": "alpine",
    "commands": [
      "echo %s" % var,
    ],
    "when": [
      "sucess",
      "failure"
    ]
  }

bradrydzewski · October 11, 2019, 12:48pm

correct, loading external scripts is not implemented

github.com

drone/drone-convert-starlark/blob/master/plugin/plugin.go#L45:L47


	ErrMainInvalid = errors.New("starlark: main must be a function")


	// ErrMainReturn indicates the starlark script's main method
	// returns an invalid or unexpected type.
	ErrMainReturn = errors.New("starlark: main returns an invalid type")


	// ErrMaximumSize indicates the starlark script generated a
	// file that exceeds the maximum allowed file size.
	ErrMaximumSize = errors.New("starlark: maximum file size exceeded")


	// ErrCannotLoad indicates the starlark script is attempting to
	// load an external file which is currently restricted.
	ErrCannotLoad = errors.New("starlark: cannot load external scripts")
)


// New returns a new converter plugin.
func New() converter.Plugin {
	return new(plugin)
}


type plugin struct {

puzzloholic · October 11, 2019, 1:09pm

@bradrydzewski Thanks for your confirmation.

Is there a hint when will it be implemented, in the near future or will never?
Because I have a urgent need to make centralized pipeline to manage microservices repo that spans to >100 in number.

I need to have some pipeline template repo to make widespread changes easier.

Or do you have a workaround for that problem?