Subject: bug#21625: [PATCH] lisp/emacs-lisp/package.el (package-install): Fix error.

From: Artur Malabarba <[email-masked]>
Date: Tue, 6 Oct 2015 11:39:41 +0100

Looks good to me.
Thanks for the patch Aaron. Have you done the copyright paperwork?

2015-10-05 20:55 GMT+01:00 Aaron Ecay <[email-masked]>:
> * lisp/emacs-lisp/package.el (package-install): Fix error when ‘pkg’ is
>   not a ‘package-desc’.  Also clarify documentation.
>
> Through trial and error, I discovered that for non-interactive use the
> ‘pkg’ argument of the package-install function should be a symbol, not a
> string.  This can also be discerned by inspecting the (interactive)
> spec, specifically the call to ‘intern’.  However, even when proceeding
> with a symbol an error is raised if the package is already installed.
> This patch reuses the name computed earlier in the function to avoid
> this.
> ---
>  lisp/emacs-lisp/package.el | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
> index eb66e8f..89f2a1a 100644
> --- a/lisp/emacs-lisp/package.el
> +++ b/lisp/emacs-lisp/package.el
> @@ -1887,7 +1887,7 @@ add a call to it along with some explanatory comments."
>  ;;;###autoload
>  (defun package-install (pkg &optional dont-select)
>    "Install the package PKG.
> -PKG can be a package-desc or the package name of one the available packages
> +PKG can be a package-desc or a symbol naming one of the available packages
>  in an archive in `package-archives'.  Interactively, prompt for its name.
>
>  If called interactively or if DONT-SELECT nil, add PKG to
> @@ -1918,15 +1918,15 @@ to install it but still mark it as selected."
>                  pkg)))
>      (unless (or dont-select (package--user-selected-p name))
>        (package--save-selected-packages
> -       (cons name package-selected-packages))))
> -  (if-let ((transaction
> -            (if (package-desc-p pkg)
> -                (unless (package-installed-p pkg)
> -                  (package-compute-transaction (list pkg)
> -                                               (package-desc-reqs pkg)))
> -              (package-compute-transaction () (list (list pkg))))))
> -      (package-download-transaction transaction)
> -    (message "`%s' is already installed" (package-desc-full-name pkg))))
> +       (cons name package-selected-packages)))
> +    (if-let ((transaction
> +              (if (package-desc-p pkg)
> +                  (unless (package-installed-p pkg)
> +                    (package-compute-transaction (list pkg)
> +                                                 (package-desc-reqs pkg)))
> +                (package-compute-transaction () (list (list pkg))))))
> +        (package-download-transaction transaction)
> +      (message "`%s' is already installed" name))))
>
>  (defun package-strip-rcs-id (str)
>    "Strip RCS version ID from the version string STR.
> --
> 2.6.0
>
>
>
>