bug#66115: [PATCH] Ensure that directory is expanded in package-vc-checkout

[Philip Kaludercic]

Joseph Turner <joseph@breatheoutbreathe.in> writes:

> Tags: patch
>
> Tags: patch
>
> This patch fixes a serious bug which caused package-vc-checkout to fail
> entirely when its second argument `directory' was not expanded.
>
> From 75a6ec74ff5e31edc7592b68e7ad9d1ec26f515c Mon Sep 17 00:00:00 2001
> From: Joseph Turner <joseph@breatheoutbreathe.in>
> Date: Wed, 20 Sep 2023 00:12:10 -0700
> Subject: [PATCH] Ensure that directory is expanded in package-vc-checkout
>
> * lisp/emacs-lisp/package-vc.el (package-vc-checkout)
> ---
>  lisp/emacs-lisp/package-vc.el | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/lisp/emacs-lisp/package-vc.el b/lisp/emacs-lisp/package-vc.el
> index 29b540d86b8..47d8c996ff0 100644
> --- a/lisp/emacs-lisp/package-vc.el
> +++ b/lisp/emacs-lisp/package-vc.el
> @@ -834,6 +834,7 @@ for the last released version of the package."
>               (setf dir subdir)
>             (user-error "Directory not empty: %S" (expand-file-name dir)))))
>       (list desc dir (and current-prefix-arg :last-release))))
> +  (setf directory (expand-file-name directory))
>    (package-vc--archives-initialize)
>    (let ((pkg-spec (or (package-vc--desc->spec pkg-desc)
>                        (and-let* ((extras (package-desc-extras pkg-desc))

DIRECTORY is passed on to `package-vc--clone' and in turn `vc-clone'.
Wouldn't it be more robust to ensure that `vc-clone' can handle
unexpanded directory names, eg. like this:

diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index 2f4b028bb4a..7f334397a5e 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -3676,8 +3676,7 @@ vc-clone
 checkout.  If BACKEND is nil, iterate through every known backend
 in `vc-handled-backends' until one succeeds.  If REV is non-nil,
 it indicates a specific revision to check out."
-  (unless directory
-    (setq directory default-directory))
+  (setq directory (expand-file-name (or directory default-directory)))
   (if backend
       (progn
         (unless (memq backend vc-handled-backends)