Initial commit

pkg/manager/managers.go

@@ -0,0 +1,124 @@
+/*
+ * LURE - Linux User REpository
+ * Copyright (C) 2023 Elara Musayelyan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package manager
+
+import (
+	"os"
+	"os/exec"
+)
+
+var Args []string
+
+type Opts struct {
+	AsRoot    bool
+	NoConfirm bool
+	Args      []string
+}
+
+var DefaultOpts = &Opts{
+	AsRoot:    true,
+	NoConfirm: false,
+}
+
+// DefaultRootCmd is the command used for privilege elevation by default
+var DefaultRootCmd = "sudo"
+
+var managers = []Manager{
+	&Pacman{},
+	&APT{},
+	&DNF{},
+	&YUM{},
+	&APK{},
+	&Zypper{},
+}
+
+// Register registers a new package manager
+func Register(m Manager) {
+	managers = append(managers, m)
+}
+
+// Manager represents a system package manager
+type Manager interface {
+	// Name returns the name of the manager.
+	Name() string
+	// Format returns the packaging format of the manager.
+	// 	Examples: rpm, deb, apk
+	Format() string
+	// Returns true if the package manager exists on the system.
+	Exists() bool
+	// Sets the command used to elevate privileges. Defaults to DefaultRootCmd.
+	SetRootCmd(string)
+	// Sync fetches repositories without installing anything
+	Sync(*Opts) error
+	// Install installs packages
+	Install(*Opts, ...string) error
+	// Remove uninstalls packages
+	Remove(*Opts, ...string) error
+	// Upgrade upgrades packages
+	Upgrade(*Opts, ...string) error
+	// InstallLocal installs packages from local files rather than repos
+	InstallLocal(*Opts, ...string) error
+	// UpgradeAll upgrades all packages
+	UpgradeAll(*Opts) error
+	// ListInstalled returns all installed packages mapped to their versions
+	ListInstalled(*Opts) (map[string]string, error)
+}
+
+// Detect returns the package manager detected on the system
+func Detect() Manager {
+	for _, mgr := range managers {
+		if mgr.Exists() {
+			return mgr
+		}
+	}
+	return nil
+}
+
+// Get returns the package manager with the given name
+func Get(name string) Manager {
+	for _, mgr := range managers {
+		if mgr.Name() == name {
+			return mgr
+		}
+	}
+	return nil
+}
+
+// getRootCmd returns rootCmd if it's not empty, otherwise returns DefaultRootCmd
+func getRootCmd(rootCmd string) string {
+	if rootCmd != "" {
+		return rootCmd
+	}
+	return DefaultRootCmd
+}
+
+func setCmdEnv(cmd *exec.Cmd) {
+	cmd.Env = os.Environ()
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+}
+
+func ensureOpts(opts *Opts) *Opts {
+	if opts == nil {
+		opts = DefaultOpts
+	}
+	opts.Args = append(opts.Args, Args...)
+	return opts
+}