emacs-29 357fe91996b 3/5: Check if package already exists before installing from checkout

[Philip Kaludercic]

branch: emacs-29
commit 357fe91996bc6015af002fe4259a3a61a5f32dbb
Author: Philip Kaludercic <philipk@posteo.net>
Commit: Philip Kaludercic <philipk@posteo.net>

    Check if package already exists before installing from checkout
    
    * lisp/emacs-lisp/package-vc.el (package-vc-install-from-checkout):
    Copy check from 'package-vc--unpack'.
---
 lisp/emacs-lisp/package-vc.el | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lisp/emacs-lisp/package-vc.el b/lisp/emacs-lisp/package-vc.el
index 80d268c2958..cf9b98308f1 100644
--- a/lisp/emacs-lisp/package-vc.el
+++ b/lisp/emacs-lisp/package-vc.el
@@ -754,6 +754,10 @@ name from the base name of DIR."
   (package-vc--archives-initialize)
   (let* ((name (or name (file-name-base (directory-file-name dir))))
          (pkg-dir (expand-file-name name package-user-dir)))
+    (when (file-exists-p pkg-dir)
+      (if (yes-or-no-p (format "Overwrite previous checkout for package `%s'?" 
name))
+          (package--delete-directory pkg-dir)
+        (error "There already exists a checkout for %s" name)))
     (make-symbolic-link (expand-file-name dir) pkg-dir)
     (package-vc--unpack-1
      (package-desc-create