refactor: move pkg/ to internal/ and update imports

Restructure project by relocating package contents from pkg/ to internal/ to better reflect internal-only usage. This commit is initial step to prepare project for public api

internal/manager/apk.go

@@ -0,0 +1,169 @@
+// This file was originally part of the project "LURE - Linux User REpository", created by Elara Musayelyan.
+// It has been modified as part of "ALR - Any Linux Repository" by the ALR Authors.
+//
+// ALR - Any Linux Repository
+// Copyright (C) 2025 The ALR Authors
+//
+// 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 (
+	"bufio"
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+// APK represents the APK package manager
+type APK struct {
+	CommonPackageManager
+}
+
+func NewAPK() *APK {
+	return &APK{
+		CommonPackageManager: CommonPackageManager{
+			noConfirmArg: "-i",
+		},
+	}
+}
+
+func (*APK) Exists() bool {
+	_, err := exec.LookPath("apk")
+	return err == nil
+}
+
+func (*APK) Name() string {
+	return "apk"
+}
+
+func (*APK) Format() string {
+	return "apk"
+}
+
+func (a *APK) Sync(opts *Opts) error {
+	opts = ensureOpts(opts)
+	cmd := a.getCmd(opts, "apk", "update")
+	setCmdEnv(cmd)
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("apk: sync: %w", err)
+	}
+	return nil
+}
+
+func (a *APK) Install(opts *Opts, pkgs ...string) error {
+	opts = ensureOpts(opts)
+	cmd := a.getCmd(opts, "apk", "add")
+	cmd.Args = append(cmd.Args, pkgs...)
+	setCmdEnv(cmd)
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("apk: install: %w", err)
+	}
+	return nil
+}
+
+func (a *APK) InstallLocal(opts *Opts, pkgs ...string) error {
+	opts = ensureOpts(opts)
+	cmd := a.getCmd(opts, "apk", "add", "--allow-untrusted")
+	cmd.Args = append(cmd.Args, pkgs...)
+	setCmdEnv(cmd)
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("apk: installlocal: %w", err)
+	}
+	return nil
+}
+
+func (a *APK) Remove(opts *Opts, pkgs ...string) error {
+	opts = ensureOpts(opts)
+	cmd := a.getCmd(opts, "apk", "del")
+	cmd.Args = append(cmd.Args, pkgs...)
+	setCmdEnv(cmd)
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("apk: remove: %w", err)
+	}
+	return nil
+}
+
+func (a *APK) Upgrade(opts *Opts, pkgs ...string) error {
+	opts = ensureOpts(opts)
+	cmd := a.getCmd(opts, "apk", "upgrade")
+	cmd.Args = append(cmd.Args, pkgs...)
+	setCmdEnv(cmd)
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("apk: upgrade: %w", err)
+	}
+	return nil
+}
+
+func (a *APK) UpgradeAll(opts *Opts) error {
+	opts = ensureOpts(opts)
+	return a.Upgrade(opts)
+}
+
+func (a *APK) ListInstalled(opts *Opts) (map[string]string, error) {
+	out := map[string]string{}
+	cmd := exec.Command("apk", "list", "-I")
+
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, err
+	}
+
+	err = cmd.Start()
+	if err != nil {
+		return nil, err
+	}
+
+	scanner := bufio.NewScanner(stdout)
+	for scanner.Scan() {
+		name, info, ok := strings.Cut(scanner.Text(), "-")
+		if !ok {
+			continue
+		}
+
+		version, _, ok := strings.Cut(info, " ")
+		if !ok {
+			continue
+		}
+
+		out[name] = version
+	}
+
+	err = scanner.Err()
+	if err != nil {
+		return nil, err
+	}
+
+	return out, nil
+}
+
+func (a *APK) IsInstalled(pkg string) (bool, error) {
+	cmd := exec.Command("apk", "info", "--installed", pkg)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		if exitErr, ok := err.(*exec.ExitError); ok {
+			// Exit code 1 means the package is not installed
+			if exitErr.ExitCode() == 1 {
+				return false, nil
+			}
+		}
+		return false, fmt.Errorf("apk: isinstalled: %w, output: %s", err, output)
+	}
+	return true, nil
+}