GNU bug report logs - #29094
dired-do-compress creates empty archives

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From: Max <mu <at> magi.net.ru>
To: 29094 <at> debbugs.gnu.org
Subject: bug#29094: dired-do-compress creates empty archives
Date: Wed, 1 Nov 2017 02:33:59 +0300

Hi,

When Z is pressed on a directory, dired (according to
dired-compress-file-suffixes variable) runs the following command:

tar -c directory | gzip -c9 > directory.tar.gz

On my system running this command results in an error:

tar: Failed open to write on /dev/rst0: Permission denied

as tar(1) defaults -f to /dev/rst0.

Argument '-f-' should be used to write to stdout.

Also '-v' is probably not needed here, since the output is not used
anywhere.

Here is a patch to correct this behaviour:

diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
index 94938cf679..14f4be07be 100644
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -974,8 +974,8 @@ command with a prefix argument (the value does not matter)."
     ;; "tar -zxf" isn't used because it's not available on the
     ;; Solaris10 version of tar. Solaris10 becomes obsolete in 2021.
     ;; Same thing on AIX 7.1.
-    ("\\.tar\\.gz\\'" "" "gzip -dc %i | tar -xv")
-    ("\\.tgz\\'" "" "gzip -dc %i | tar -xv")
+    ("\\.tar\\.gz\\'" "" "gzip -dc %i | tar -xf -")
+    ("\\.tgz\\'" "" "gzip -dc %i | tar -xf -")
     ("\\.gz\\'" "" "gunzip")
     ("\\.Z\\'" "" "uncompress")
     ;; For .z, try gunzip.  It might be an old gzip file,
@@ -990,7 +990,7 @@ command with a prefix argument (the value does not matter)."
     ;; This item controls naming for compression.
     ("\\.tar\\'" ".tgz" nil)
     ;; This item controls the compression of directories
-    (":" ".tar.gz" "tar -c %i | gzip -c9 > %o"))
+    (":" ".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)
@@ -1007,9 +1007,9 @@ Otherwise, the rule is a compression rule, and compression is done with gzip.
 ARGS are command switches passed to PROGRAM.")
 
 (defvar dired-compress-files-alist
-  '(("\\.tar\\.gz\\'" . "tar -c %i | gzip -c9 > %o")
-    ("\\.tar\\.bz2\\'" . "tar -c %i | bzip2 -c9 > %o")
-    ("\\.tar\\.xz\\'" . "tar -c %i | xz -c9 > %o")
+  '(("\\.tar\\.gz\\'" . "tar -cf - %i | gzip -c9 > %o")
+    ("\\.tar\\.bz2\\'" . "tar -cf - %i | bzip2 -c9 > %o")
+    ("\\.tar\\.xz\\'" . "tar -cf - %i | xz -c9 > %o")
     ("\\.zip\\'" . "zip %o -r --filesync %i"))
   "Control the compression shell command for `dired-do-compress-to'.
 

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