bug#39024: 28.0.50; Unable to compress or uncompress files in Emacs on Windows 10

bug#39024: 28.0.50; Unable to compress or uncompress files in Emacs on Windows 10

[Raoul Comninos]

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When I try to compress a file in Dired in Emacs on Windows 10 I get the
following error message:

ls-lisp-insert-directory: Reading directory: Directory doesn't exist or is
inaccessible, c.tar.gz

If I try in Emacs -Q I get a different error message:

/usr/bin/bash: c.tar.gz/: Is a directory

tar: Removing leading \c:/' from member names`

In GNU Emacs 28.0.50 (build 1, x86_64-w64-mingw32)
 of 2020-01-07 built on DESKTOP-M4UH92U
Repository revision: dd85664d23e29363fe08f8cbbf2b96472ac60fc1
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.18363
System Description: Microsoft Windows 10 Pro (v10.0.1909.18363.535)

Recent messages:
Move: 1 file done
Trashing...done
Filtering...
Nothing to filter
Filtering...
Filtered 2 lines.
Filtering...
Nothing to filter
Filtering...
Filtered 3 lines.

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2
HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
  shell-dirtrack-mode: t
  persistent-scratch-autosave-mode: t
  winner-mode: t
  recentf-mode: t
  pdf-occur-global-minor-mode: t
  savehist-mode: t
  override-global-mode: t
  display-time-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Load-path shadows:
~/.emacs.d/contrib/ox-pandoc/ox-pandoc hides
c:/home/.emacs.d/elpa/ox-pandoc-20180510.1338/ox-pandoc
~/.emacs.d/yasnippet/yasnippet hides
c:/home/.emacs.d/elpa/yasnippet-20191222.2206/yasnippet
c:/home/.emacs.d/elpa/org-20191230/ox hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox
c:/home/.emacs.d/elpa/org-20191230/ox-texinfo hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-texinfo
c:/home/.emacs.d/elpa/org-20191230/ox-publish hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-publish
c:/home/.emacs.d/elpa/org-20191230/ox-org hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-org
c:/home/.emacs.d/elpa/org-20191230/ox-odt hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-odt
c:/home/.emacs.d/elpa/org-20191230/ox-md hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-md
c:/home/.emacs.d/elpa/org-20191230/ox-man hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-man
c:/home/.emacs.d/elpa/org-20191230/ox-latex hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-latex
c:/home/.emacs.d/elpa/org-20191230/ox-icalendar hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-icalendar
c:/home/.emacs.d/elpa/org-20191230/ox-html hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-html
c:/home/.emacs.d/elpa/org-20191230/ox-beamer hides
c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ox-beamer
c:/home/.emacs.d/elpa/org-20191230/ox-ascii hides
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c:/msys64/mingw64/share/emacs/28.0.50/lisp/org/ob-matlab
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Features:
(shadow image-file mail-extr emacsbug sendmail mm-archive mule-util
gnutls network-stream url-cache sort shell find-dired dired-filter f s
thingatpt dired-hacks-utils dired-aux xah-find ido org-download url-http
url-auth url-gw nsm async yasnippet-snippets yasnippet dired-x deft
ediff ediff-merg ediff-mult ediff-wind ediff-diff ediff-help ediff-init
ediff-util ox-pandoc rx ht dash ox-org persistent-scratch ox-reveal cl
ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util rng-pttrn
nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex ox-icalendar
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bug#39024: 28.0.50; Unable to compress or uncompress files in Emacs on Windows 10

[Eli Zaretskii]

> From: Raoul Comninos <revcomninos@gmail.com>
> Date: Wed, 8 Jan 2020 00:54:45 +0200
> 
> When I try to compress a file in Dired in Emacs on Windows 10 I get the following error message:
> 
> ls-lisp-insert-directory: Reading directory: Directory doesn't exist or is inaccessible, c.tar.gz
> 
> If I try in Emacs -Q I get a different error message:
> 
> /usr/bin/bash: c.tar.gz/: Is a directory
> 
> tar: Removing leading \c:/' from member names`

Thanks.  Compressing directories in Dired on Windows was botched ever
since it was introduced, and on platforms other than Windows it could
fail as well, for the same reasons, in some rare cases.

I've now fixed it for the upcoming Emacs 27.1.  In case you want to
patch your Emacs without waiting for the next release, the patch is
below.

And with that, I'm closing the bug report.

diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
index 59d389d..0069c17 100644
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -992,7 +992,14 @@ dired-compress
 	  (ignore-errors (dired-remove-entry new-file))
 	  (goto-char start)
 	  ;; Now replace the current line with an entry for NEW-FILE.
-	  (dired-update-file-line new-file) nil)
+	  ;; But don't remove the current line if either FROM-FILE or
+	  ;; NEW-FILE is a directory, because compressing/uncompressing
+          ;; directories doesn't remove the original.
+          (if (or (file-directory-p from-file)
+                  (file-directory-p new-file))
+              (dired-add-entry new-file nil t)
+            (dired-update-file-line new-file))
+          nil)
       (dired-log (concat "Failed to (un)compress " from-file))
       from-file)))
 
@@ -1020,8 +1027,9 @@ dired-compress-file-suffixes
     ("\\.7z\\'" "" "7z x -aoa -o%o %i")
     ;; This item controls naming for compression.
     ("\\.tar\\'" ".tgz" nil)
-    ;; This item controls the compression of directories
-    (":" ".tar.gz" "tar -cf - %i | gzip -c9 > %o"))
+    ;; This item controls the compression of directories.  Its REGEXP
+    ;; element should never match any valid file name.
+    ("\000" ".tar.gz" "tar -cf - %i | gzip -c9 > %o"))
   "Control changes in file name suffixes for compression and uncompression.
 Each element specifies one transformation rule, and has the form:
   (REGEXP NEW-SUFFIX PROGRAM)
@@ -1145,7 +1153,7 @@ dired-compress-file
            (condition-case nil
                (if (file-directory-p file)
                    (progn
-                     (setq suffix (cdr (assoc ":" dired-compress-file-suffixes)))
+                     (setq suffix (cdr (assoc "\000" dired-compress-file-suffixes)))
                      (when suffix
                        (let ((out-name (concat file (car suffix)))
                              (default-directory (file-name-directory file)))

bug#39024: 28.0.50; Unable to compress or uncompress files in Emacs on Windows 10

[Eli Zaretskii]

> From: Raoul Comninos <revcomninos@gmail.com>
> Date: Wed, 8 Jan 2020 21:46:02 +0200
> 
> Thank you Eli. I have applied the patch and tested compression. I can compress successfully now, but when
> I try to uncompress  I get this error:
> 
> apply: Searching for program: Permission denied, gunzip
> 
> I have gunzip installed and it is in my path. 

Are you trying to uncompress a .tar.gz archive of a compressed
directory, or are you trying to uncompress a .gz file that is not a
directory?

And what is 'gunzip' in your case? is it per chance a Unix shell
script and not a .exe program?  Emacs on Windows cannot invoke Unix
shell scripts.

bug#39024: 28.0.50; Unable to compress or uncompress files in Emacs on Windows 10

[Eli Zaretskii]

> From: Raoul Comninos <revcomninos@gmail.com>
> Date: Wed, 8 Jan 2020 22:25:47 +0200
> 
> I see I can uncompress a folder but not a file that I have compressed--though I can visit it. 
> I have gzip.exe installed in C:\GnuWin32\bin

Do you have gunzip.exe as well?  Uncompressing a file (not a
directory) requires gunzip.exe.  If you do have it, make sure it is
found on PATH before gunzip a shell script (if you have such a
script).

bug#39024: 28.0.50; Unable to compress or uncompress files in Emacs on Windows 10

[Eli Zaretskii]

> From: Raoul Comninos <revcomninos@gmail.com>
> Date: Thu, 9 Jan 2020 08:07:12 +0200
> 
> Eli, installing gunzip.exe worked for me. I can confirm compressing and uncompressing is working in my
> Emacs now. 
> Once again, thank you for all you help. It is greatly appreciated.
> Personally I like the feature of compressing and uncompressing files in Emacs.

OK, so this issue is now officially resolved.

Thanks.