81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
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package pkg
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import (
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"encoding/json"
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"errors"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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)
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var ErrUnknownDistribution = errors.New("unknown linux distribution")
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var ErrNoCandidateInstalled = errors.New("no package-manager candidate installed")
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var ErrNoDriverFound = errors.New("no driver found for the package manager")
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func Load() (PackageManager, error) {
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// 1. get distro name
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out, err := exec.Command("lsb_release", "-is").Output()
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if err != nil {
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return nil, err
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}
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distro := strings.ToLower(strings.Trim(string(out), " \n\t"))
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// 2. load config file
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driverTable := filepath.Join(os.Getenv("GOPATH"), "src/git.xdrm.io/xdrm-brackets/nix-amer/meta/pkg-drivers.json")
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file, err := os.Open(driverTable)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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// 3. Parse json
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table := make(map[string][]string)
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decoder := json.NewDecoder(file)
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if err := decoder.Decode(&table); err != nil {
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return nil, err
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}
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decoder = nil
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// 4. Get available package-manager list for distro
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available, exists := table[distro]
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if !exists || len(available) < 1 {
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return nil, ErrUnknownDistribution
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}
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// 5. Check each available package-manager in order
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selected := ""
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for _, current := range available {
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if exec.Command("which", current).Run() == nil {
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selected = current
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break
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}
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}
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// no candidate installed
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if len(selected) < 1 {
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return nil, ErrNoCandidateInstalled
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}
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// 6. Instanciate
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switch selected {
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case "apt-get":
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return new(Apt), nil
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case "apk":
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return new(Apk), nil
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case "eopkg":
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return new(Eopkg), nil
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case "pacman":
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return new(Pacman), nil
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case "dnf":
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return new(Dnf), nil
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case "yum":
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return new(Yum), nil
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}
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return nil, ErrNoDriverFound
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}
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