add MSYS2 archive downloader

util/get-msys2-archive.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+const (
+	maxRetries = 3
+	retryDelay = 2 * time.Second
+	baseUrl    = "https://github.com/msys2/msys2-archive/releases/download"
+	targetDir  = "C:\\msys64\\var\\lib\\pacman\\sync"
+)
+
+var databases = []string{
+	"clang64",
+	"clangarm64",
+	"mingw32",
+	"mingw64",
+	"msys",
+	"ucrt64",
+}
+
+func downloadFile(url string, filepath string) error {
+	var err error
+	for i := 0; i < maxRetries; i++ {
+		if i > 0 {
+			fmt.Printf("Retrying download for %s in %v...\n", url, retryDelay)
+			time.Sleep(retryDelay)
+		}
+
+		err = attemptDownload(url, filepath)
+		if err == nil {
+			return nil
+		}
+		fmt.Printf("Attempt %d failed for %s: %v\n", i+1, url, err)
+	}
+	return fmt.Errorf("failed to download %s after %d attempts: %w", url, maxRetries, err)
+}
+
+func attemptDownload(url string, filepath string) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("bad status: %s", resp.Status)
+	}
+
+	out, err := os.Create(filepath)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, resp.Body)
+	return err
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Printf("Usage: %s <archive_date>\n", os.Args[0])
+		os.Exit(1)
+	}
+
+	archiveDate := os.Args[1]
+	archiveBaseUrl := baseUrl + "/" + archiveDate
+
+	if _, err := os.Stat(targetDir); os.IsNotExist(err) {
+		fmt.Printf("Target directory %s does not exist. Exiting.\n", targetDir)
+		os.Exit(1)
+	}
+
+	var wg sync.WaitGroup
+
+	for _, db := range databases {
+		filesToDownload := []string{
+			fmt.Sprintf("%s.db", db),
+			fmt.Sprintf("%s.db.sig", db),
+		}
+
+		for _, file := range filesToDownload {
+			wg.Add(1)
+			go func(fileName string) {
+				defer wg.Done()
+				fileUrl := fmt.Sprintf("%s/%s", archiveBaseUrl, fileName)
+				filePath := filepath.Join(targetDir, fileName)
+
+				fmt.Printf("Downloading %s...\n", fileUrl)
+				if err := downloadFile(fileUrl, filePath); err != nil {
+					fmt.Printf("Failed to download %s: %v\n", fileUrl, err)
+				} else {
+					fmt.Printf("Successfully downloaded %s\n", filePath)
+				}
+			}(file)
+		}
+	}
+
+	wg.Wait()
+	fmt.Println("All downloads completed.")
+}