From b8ae6e364ad97379ee8b1c3a0206e3281f6fe466 Mon Sep 17 00:00:00 2001
From: Felipe Cotti <felipe@cotti.com.br>
Date: Fri, 6 Dec 2024 18:39:47 -0300
Subject: [PATCH] Starting implementation of the backup service.

---
 .../guestbooky-backup/guestbooky-backup.go    | 17 ++++++++++++++++
 src/Guestbooky-backup/go.mod                  |  3 +++
 .../internal/compactor/compactor.go           | 20 +++++++++++++++++++
 3 files changed, 40 insertions(+)
 create mode 100644 src/Guestbooky-backup/cmd/guestbooky-backup/guestbooky-backup.go
 create mode 100644 src/Guestbooky-backup/go.mod
 create mode 100644 src/Guestbooky-backup/internal/compactor/compactor.go

diff --git a/src/Guestbooky-backup/cmd/guestbooky-backup/guestbooky-backup.go b/src/Guestbooky-backup/cmd/guestbooky-backup/guestbooky-backup.go
new file mode 100644
index 0000000..864b7da
--- /dev/null
+++ b/src/Guestbooky-backup/cmd/guestbooky-backup/guestbooky-backup.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/cotti/Guestbooky-backup/internal/compactor"
+)
+
+func main() {
+	err := compactor.Compact(os.Args[1], os.Args[2])
+	if err != nil {
+		fmt.Println("An error occurred while compacting:", err.Error())
+		os.Exit(1)
+	}
+	os.Exit(0)
+}
diff --git a/src/Guestbooky-backup/go.mod b/src/Guestbooky-backup/go.mod
new file mode 100644
index 0000000..8084f1f
--- /dev/null
+++ b/src/Guestbooky-backup/go.mod
@@ -0,0 +1,3 @@
+module github.com/cotti/Guestbooky-backup
+
+go 1.23.1
diff --git a/src/Guestbooky-backup/internal/compactor/compactor.go b/src/Guestbooky-backup/internal/compactor/compactor.go
new file mode 100644
index 0000000..ed662e7
--- /dev/null
+++ b/src/Guestbooky-backup/internal/compactor/compactor.go
@@ -0,0 +1,20 @@
+package compactor
+
+import (
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+)
+
+func Compact(source, destination string) error {
+	fmt.Println(
+		"Compacting", source, "to", destination,
+	)
+
+	if _, err := os.Stat(source); errors.Is(err, fs.ErrNotExist) {
+		return errors.New("source file does not exist")
+	}
+
+	return nil
+}