bug#12524: 24.2.50; package-delete errors if directory doesn't exist

[Ivan Andrus]

If a directory for a package does not exist (say it was deleted outside
of emacs), then package-delete errors, which causes further packages to
not be deleted.

I have included a patch to fix the problem in a way that I think is
satisfactory.  It simply emits a message that it's not ignoring deletion
of the package because it could not find the directory.  Please critique
and/or apply as you see fit.  Also, if the patch should be in a
different format, should be an attachment, etc., don't hesitate to tell
me.  I did read [1], but may have missed something.  I don't know if
this is a change that needs a changelog entry, but I thought I would add
one just in case.

FWIW, I now have copyright papers on file with the FSF.

-Ivan

[1] 
http://www.gnu.org/software/emacs/manual/html_node/emacs/Sending-Patches.html



=== modified file 'lisp/ChangeLog'
--- lisp/ChangeLog      2012-09-26 15:19:10 +0000
+++ lisp/ChangeLog      2012-09-26 19:45:55 +0000
@@ -1,3 +1,8 @@
+2012-09-26  Ivan Andrus  <darthandrus@gmail.com>
+
+       * emacs-lisp/package.el (package-delete): Don't error if package
+       directory is missing.
+
2012-09-26  Tomohiro Matsuyama  <tomo@cx4a.org>
             Stefan Monnier  <monnier@iro.umontreal.ca>


=== modified file 'lisp/emacs-lisp/package.el'
--- lisp/emacs-lisp/package.el  2012-09-24 16:36:42 +0000
+++ lisp/emacs-lisp/package.el  2012-09-26 08:27:22 +0000
@@ -1072,15 +1072,19 @@

(defun package-delete (name version)
   (let ((dir (package--dir name version)))
-    (if (string-equal (file-name-directory dir)
-                     (file-name-as-directory
-                      (expand-file-name package-user-dir)))
-       (progn
-         (delete-directory dir t t)
-         (message "Package `%s-%s' deleted." name version))
-      ;; Don't delete "system" packages
-      (error "Package `%s-%s' is a system package, not deleting"
-            name version))))
+    (cond ((null dir)
+          (message "Directory for `%s-%s' is already deleted, ignoring"
+                   name version))
+         ((string-equal (file-name-directory dir)
+                        (file-name-as-directory
+                         (expand-file-name package-user-dir)))
+          (progn
+            (delete-directory dir t t)
+            (message "Package `%s-%s' deleted." name version)))
+         (t
+          ;; Don't delete "system" packages
+          (error "Package `%s-%s' is a system package, not deleting"
+                 name version)))))

(defun package-archive-base (name)
   "Return the archive containing the package NAME."






In GNU Emacs 24.2.50.1 (i386-apple-darwin10.8.0, NS apple-appkit-1038.36)
of 2012-09-26 on oroszlan.local
Bzr revision: 110206 monnier@iro.umontreal.ca-20120926151910-31p6modgf6vf2g4z
Windowing system distributor `Apple', version 10.3.1038
Configured using:
`configure '--with-ns' 'CC=gcc -std=gnu99' 'CFLAGS=-g3 -O2' 'LDFLAGS='
'CPPFLAGS=''

Important settings:
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: VC dir

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Recent input:
M-w M-w M-w M-w M-w C-x 1 M-w <down-mouse-1> <mouse-1>
C-x C-f C-g M-x C-g C-x C-f v c <return> <return> <return>
<return> p a <backspace> <backspace> <return> p a c
C-s <return> C-x v = M-n M-p M-n M-p M-p <C-tab> C-x
v = M-n C-/ C-/ <C-tab> C-/ C-x v = <C-tab> <C-tab>
<C-tab> C-x C-f <backspace> <backspace> . b <return>
C-g C-h l <down-mouse-1> <mouse-1> <down> <down> <up>
<down> <down> <C-tab> C-h k C-x v = C-x v = <menu-bar>
<Diff> <Create Change Log entries> D o n ' t SPC e
r r o r SPC i f SPC <C-backspace> <C-backspace> <C-backspace>
D o n ' t SPC e r r o r SPC i f SPC p a c g <backspace>
k a g e SPC d i r e c t o r y SPC i s SPC m i s s i
n g C-a C-e C-x C-s M-w <C-tab> <C-tab> C-x v d <backspace>
<backspace> <return> n n m n m = n n p n <menu-bar>
<Diff> <Unified -> Context> <wheel-up> <double-wheel-up>
<triple-wheel-up> <C-tab> = n C-3 C-a C-M-SPC C-3 C-e
C-w <C-tab> M-x r e p <return>

Recent messages:
vc-emacs now compiling locally
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Features:
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linum-relative-autoloads mark-multiple-autoloads
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clojure-mode-autoloads slime-repl-autoloads slime-autoloads
undo-tree-autoloads unicode-whitespace-autoloads ucs-utils-autoloads
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vala-mode-autoloads websocket-autoloads wgrep-autoloads
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czech european ethiopic indian cyrillic chinese case-table epa-hook
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cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
make-network-process ns multi-tty emacs)