nix-amer/internal/instruction/service.go

package instruction

import (
	"fmt"
	"strings"
)

var actions = []string{"enable", "disable", "start", "stop", "reload", "restart"}

type service struct {
	raw      string
	Action   string
	Services []string
}

func (d *service) Raw() string { return strings.Join([]string{"service", d.raw}, " ") }

func (d *service) Build(_args string) error {

	// 1. extract action (sub command)
	split := strings.Split(_args, " ")

	// 2. check action
	if len(split) < 2 {
		return fmt.Errorf("invalid syntax, missing action or unit")
	}

	// 3. fail if unknown action
	known := false
	for _, act := range actions {
		if split[0] == act {
			known = true
			break
		}
	}
	if !known {
		return fmt.Errorf("unknown action '%s'", split[0])
	}

	d.Action = split[0]

	// 4. Store services
	d.Services = split[1:]
	d.raw = _args

	return nil
}

func (d service) Exec(ctx ExecutionContext) ([]byte, error) {

	// delete all packages
	for _, service := range d.Services {

		if err := ctx.ServiceManager.Exec(d.Action, service); err != nil {
			return nil, fmt.Errorf("cannot %s '%s' | %s", d.Action, service, err)
		}

	}

	return nil, nil

}
func (d service) DryRun(ctx ExecutionContext) ([]byte, error) {

	// fail if a service does not exist
	for _, service := range d.Services {

		if err := ctx.ServiceManager.Exec("status", service); err != nil {
			return nil, fmt.Errorf("cannot find service '%s' | %s", service, err)
		}

	}

	return nil, nil

}