Add release auto-update launcher

VRWT_Tool/VRC_OSC/internal/update/manager.go

@@ -0,0 +1,106 @@
+package update
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+
+	"vrc_osc_go/internal/buildinfo"
+	"vrc_osc_go/internal/common"
+)
+
+type Manager struct {
+	Client       *Client
+	OwnerRepo    string
+	AssetName    string
+	CurrentLabel string
+}
+
+func (m *Manager) CheckAndUpdate() (bool, error) {
+	if m.Client == nil || m.OwnerRepo == "" || m.AssetName == "" {
+		return false, nil
+	}
+	latest, err := m.Client.LatestRelease(m.OwnerRepo)
+	if err != nil {
+		return false, err
+	}
+	if latest.TagName == "" || latest.TagName == m.CurrentLabel {
+		return false, nil
+	}
+	assetURL := ""
+	for _, a := range latest.Assets {
+		if a.Name == m.AssetName {
+			assetURL = a.URL
+			break
+		}
+	}
+	if assetURL == "" {
+		return false, fmt.Errorf("asset %q not found in release %s", m.AssetName, latest.TagName)
+	}
+	base := common.RootDir()
+	tmpDir := filepath.Join(base, "update", latest.TagName)
+	if err := os.MkdirAll(tmpDir, 0o755); err != nil {
+		return false, err
+	}
+	zipPath := filepath.Join(tmpDir, m.AssetName)
+	log.Printf("update available: %s -> %s", m.CurrentLabel, latest.TagName)
+	if err := m.Client.DownloadAsset(assetURL, zipPath); err != nil {
+		return false, err
+	}
+	if err := ExtractZip(zipPath, tmpDir); err != nil {
+		return false, err
+	}
+	exePath := filepath.Join(base, CurrentExeName())
+	newExe := filepath.Join(tmpDir, CurrentExeName())
+	if _, err := os.Stat(newExe); err != nil {
+		return false, err
+	}
+	backup := exePath + ".bak"
+	_ = os.Remove(backup)
+	if err := os.Rename(exePath, backup); err != nil {
+		return false, err
+	}
+	if err := CopyFile(newExe, exePath); err != nil {
+		_ = os.Rename(backup, exePath)
+		return false, err
+	}
+	_ = os.Remove(backup)
+	return true, nil
+}
+
+func CopyFile(src, dst string) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+	if err := os.MkdirAll(filepath.Dir(dst), 0o755); err != nil {
+		return err
+	}
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+	_, err = io.Copy(out, in)
+	return err
+}
+
+func Launch(exe string, args []string) error {
+	cmd := exec.Command(exe, args...)
+	cmd.Dir = filepath.Dir(exe)
+	return cmd.Start()
+}
+
+func Version() string { return buildinfo.Version }
+
+func CurrentExeName() string {
+	if runtime.GOOS == "windows" {
+		return "vrc_osc.exe"
+	}
+	return "vrc_osc"
+}