wasi-module-sdk-go/exec/lookup.go

package exec

import (
	"errors"
	"fmt"

	wasiv1 "code.icb4dc0.de/buildr/api/generated/wasi/v1"
	"code.icb4dc0.de/buildr/wasi-module-sdk-go/mem"
)

func LookPath(file string) (string, error) {
	lookupPathReq := &wasiv1.LookupPathRequest{
		Command: file,
	}

	data, err := lookupPathReq.MarshalVT()
	if err != nil {
		return "", err
	}

	result := _lookPath(mem.DataToManagedPtr(data))
	if result == 0 {
		return "", fmt.Errorf("failed to lookup in path: %s", file)
	}

	resultPtr := uint32(result >> 32)
	resultSize := uint32(result)

	if resultSize == 0 {
		return "", fmt.Errorf("failed to lookup in path: %s", file)
	}

	lookupPathResp := new(wasiv1.LookupPathResponse)
	if err := lookupPathResp.UnmarshalVT(mem.PtrToData(resultPtr, resultSize)); err != nil {
		return "", err
	}

	if len(lookupPathResp.Error) > 0 {
		return "", errors.New(lookupPathResp.Error)
	}

	return lookupPathResp.Path, nil
}