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'.

diff --git a/lisp/emacs-lisp/package-vc.el b/lisp/emacs-lisp/package-vc.el
index 80d268c29589934cd2d439901d3c7bd34f959a34..cf9b98308f1b6bf2d0dccd91d14c9d9227d3d31d 100644 (file)
--- 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