added basic cache functionality. Note that this works only with the install command, and stores only the PKGBUILD files.

.gitignore

@@ -0,0 +1 @@
+apac

cmd/install.go

@@ -2,12 +2,17 @@ package cmd
 
 import (
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
+	"path/filepath"
+	"time"
 
 	"github.com/spf13/cobra"
 )
 
+const cacheBase = "/var/cache/apac/pkgs"
+
 var installCmd = &cobra.Command{
 	Use:   "install",
 	Short: "installs a package",
@@ -15,36 +20,96 @@ var installCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 		if len(args) == 0 {
 			fmt.Fprintln(os.Stderr, "error: package name required")
-			return
+			os.Exit(1)
 		}
 		pkg := args[0]
 		url := "https://aur.archlinux.org/" + pkg
 
-		// git clone
-		fmt.Println("cloning:", url)
-		out, err := exec.Command("git", "clone", url).CombinedOutput()
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "git clone failed: %v\n%s\n", err, string(out))
-			return
+		// ensure cache directory exists (use sudo mkdir -p so permissions can be elevated)
+		mkdirCmd := exec.Command("sudo", "mkdir", "-p", cacheBase)
+		mkdirCmd.Stdin = os.Stdin
+		mkdirCmd.Stdout = os.Stdout
+		mkdirCmd.Stderr = os.Stderr
+		if err := mkdirCmd.Run(); err != nil {
+			fmt.Fprintf(os.Stderr, "failed to create cache dir %s: %v\n", cacheBase, err)
+			os.Exit(1)
 		}
 
-		// makepkg -si inside package dir
+		cacheDir := filepath.Join(cacheBase, pkg)
+		tmpDir := filepath.Join(os.TempDir(), "apac-build-"+pkg+"-"+time.Now().Format("20060102-150405"))
+
+		// clone into cache if missing; DO NOT pull/update existing cache
+		if _, err := os.Stat(cacheDir); os.IsNotExist(err) {
+			fmt.Println("cloning into cache:", url, "->", cacheDir)
+			cloneCmd := exec.Command("sudo", "git", "clone", url, cacheDir)
+			cloneCmd.Stdin = os.Stdin
+			cloneCmd.Stdout = os.Stdout
+			cloneCmd.Stderr = os.Stderr
+			if err := cloneCmd.Run(); err != nil {
+				fmt.Fprintf(os.Stderr, "git clone failed: %v\n", err)
+				os.Exit(1)
+			}
+		} else if err != nil {
+			fmt.Fprintf(os.Stderr, "stat cache dir failed: %v\n", err)
+			os.Exit(1)
+		} else {
+			fmt.Println("using cached repo:", cacheDir)
+		}
+
+		// copy cached repo into a temporary build directory
+		if err := copyDir(cacheDir, tmpDir); err != nil {
+			fmt.Fprintf(os.Stderr, "failed to copy to build dir: %v\n", err)
+			os.Exit(1)
+		}
+		defer os.RemoveAll(tmpDir)
+
+		// run makepkg in tmpDir (makepkg will handle permissions)
 		fmt.Println("building/installing:", pkg)
 		buildCmd := exec.Command("makepkg", "-si", "--noconfirm")
-		buildCmd.Dir = pkg
+		buildCmd.Dir = tmpDir
 		buildCmd.Stdin = os.Stdin
 		buildCmd.Stdout = os.Stdout
 		buildCmd.Stderr = os.Stderr
-		buildCmd.Run()
-		// cleanup
-		if err := os.RemoveAll(pkg); err != nil {
-			fmt.Fprintf(os.Stderr, "warning: failed to remove %s: %v\n", pkg, err)
+		if err := buildCmd.Run(); err != nil {
+			fmt.Fprintf(os.Stderr, "makepkg failed: %v\n", err)
+			os.Exit(1)
 		}
 
 		fmt.Println("install successful")
 	},
 }
 
+func copyDir(src, dst string) error {
+	if err := os.MkdirAll(dst, 0755); err != nil {
+		return err
+	}
+	return filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		rel, err := filepath.Rel(src, path)
+		if err != nil {
+			return err
+		}
+		target := filepath.Join(dst, rel)
+		if info.IsDir() {
+			return os.MkdirAll(target, info.Mode())
+		}
+		in, err := os.Open(path)
+		if err != nil {
+			return err
+		}
+		defer in.Close()
+		out, err := os.OpenFile(target, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, info.Mode())
+		if err != nil {
+			return err
+		}
+		defer out.Close()
+		_, err = io.Copy(out, in)
+		return err
+	})
+}
+
 func init() {
 	rootCmd.AddCommand(installCmd)
 }