spud/service_definition/fetcher.go

package service_definition

import (
	"github.com/goccy/go-yaml"
	"os"
	"os/exec"
	"strings"
)

// Clones the target git repository and uses it as a basis to extract
// a service definition.
func getDefinitionFromGit(path string) (ServiceDefinition, error) {
	dir, err := os.MkdirTemp("/tmp", "spud-service-")

	if err != nil {
		return ServiceDefinition{}, err
	}

	cloneCmd := exec.Command("git", "clone", strings.TrimPrefix(path, "git+"), dir)

	if err := cloneCmd.Run(); err != nil {
		return ServiceDefinition{}, err
	}

	return getDefinitionFromFile(dir + "/service.yml")
}

// Extracts a service definition from the given filepath.
func getDefinitionFromFile(path string) (ServiceDefinition, error) {
	var definition ServiceDefinition

	defData, err := os.ReadFile(path)

	if err != nil {
		return ServiceDefinition{}, &FileDoesNotExistError{Message: "Could not find service configuration file", ExpectedPath: path}
	}

	if err = yaml.Unmarshal(defData, &definition); err != nil {
		return ServiceDefinition{}, &InvalidServiceDefinitionError{Path: path}
	}

	return definition, nil
}