nix-amer/internal/pkg/loader.go

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package pkg
import (
"errors"
)
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// ErrUnknownManager is raised when the asked manager does not exist
var ErrUnknownManager = errors.New("unknown package manager")
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// ErrNotInstalled is raised when the candidate package manager is not installed
// on the host system (use command-line -dry-run to avoid execution errors and just
// check your buildfile syntax)
var ErrNotInstalled = errors.New("no candidate installed")
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// Load a specific package-manager by its name
func Load(_manager string) (PackageManager, error) {
// 1. create manager (fail if unknown)
var manager PackageManager
switch _manager {
case "apt-get":
manager = new(aptGet)
case "apk":
manager = new(apk)
case "eopkg":
manager = new(eopkg)
case "pacman":
manager = new(pacman)
case "dnf":
manager = new(dnf)
case "yum":
manager = new(yum)
default:
return nil, ErrUnknownManager
}
// 2. fail if not installed
// if exec.Command("which", manager.Name()).Run() != nil {
// return nil, ErrNotInstalled
// }
return manager, nil
}