...

pkg/system/builders/postgresql/postgres/download.go

@@ -0,0 +1,50 @@
+package postgres
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+// DownloadPostgres downloads the PostgreSQL source code if it doesn't already exist
+func (b *PostgresBuilder) DownloadPostgres() error {
+	// Check if the file already exists
+	if _, err := os.Stat(b.PostgresTar); err == nil {
+		fmt.Printf("PostgreSQL source already downloaded at %s, skipping download\n", b.PostgresTar)
+		return nil
+	}
+
+	fmt.Println("Downloading PostgreSQL source...")
+	return downloadFile(b.PostgresURL, b.PostgresTar)
+}
+
+// downloadFile downloads a file from url to destination path
+func downloadFile(url, dst string) error {
+	// Create the file
+	out, err := os.Create(dst)
+	if err != nil {
+		return fmt.Errorf("failed to create file %s: %w", dst, err)
+	}
+	defer out.Close()
+
+	// Get the data
+	resp, err := http.Get(url)
+	if err != nil {
+		return fmt.Errorf("failed to download from %s: %w", url, err)
+	}
+	defer resp.Body.Close()
+
+	// Check server response
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("bad status: %s when downloading %s", resp.Status, url)
+	}
+
+	// Write the body to file
+	_, err = io.Copy(out, resp.Body)
+	if err != nil {
+		return fmt.Errorf("failed to write to file %s: %w", dst, err)
+	}
+
+	return nil
+}