From 1ab21c82c342618051319c93125945c62142ec03 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Thu, 26 Jan 2023 11:39:19 +0100
Subject: [PATCH] gpgtar: Allow decryption from stdin.

* tools/gpgtar.c (main): Revamp switch and fix usage test for aDecrypt
and aList.
--

GnuPG-bug-id: 6355
---
 doc/tools.texi |  8 ++++++--
 tools/gpgtar.c | 31 ++++++++++++++-----------------
 2 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/doc/tools.texi b/doc/tools.texi
index e22a2285f..5fa21c66a 100644
--- a/doc/tools.texi
+++ b/doc/tools.texi
@@ -1907,6 +1907,8 @@ Put given files and directories into a vanilla ``ustar'' archive.
 @item --extract
 @opindex extract
 Extract all files from a vanilla ``ustar'' archive.
+If no file name is given (or it is "-") the archive is taken from
+stdin.
 
 @item --encrypt
 @itemx -e
@@ -1918,7 +1920,8 @@ be decrypted via a secret key or a passphrase.
 @item --decrypt
 @itemx -d
 @opindex decrypt
-Extract all files from an encrypted archive.
+Extract all files from an encrypted archive.   If no file name is given
+(or it is "-") the archive is taken from stdin.
 
 @item --sign
 @itemx -s
@@ -1929,7 +1932,8 @@ encrypted archive.
 @item --list-archive
 @itemx -t
 @opindex list-archive
-List the contents of the specified archive.
+List the contents of the specified archive.  If no file name is given
+(or it is "-") the archive is taken from stdin.
 
 @item --symmetric
 @itemx -c
diff --git a/tools/gpgtar.c b/tools/gpgtar.c
index 8461666b9..b412f3ffb 100644
--- a/tools/gpgtar.c
+++ b/tools/gpgtar.c
@@ -499,17 +499,27 @@ main (int argc, char **argv)
 
   switch (cmd)
     {
+    case aDecrypt:
     case aList:
       if (argc > 1)
         gpgrt_usage (1);
-      fname = argc ? *argv : NULL;
+      fname = (argc && strcmp (*argv, "-"))? *argv : NULL;
       if (opt.filename)
         log_info ("note: ignoring option --set-filename\n");
       if (files_from)
         log_info ("note: ignoring option --files-from\n");
-      err = gpgtar_list (fname, !skip_crypto);
-      if (err && log_get_errorcount (0) == 0)
-        log_error ("listing archive failed: %s\n", gpg_strerror (err));
+      if (cmd == aDecrypt)
+        {
+          err = gpgtar_extract (fname, !skip_crypto);
+          if (err && !log_get_errorcount (0))
+            log_error ("extracting archive failed: %s\n", gpg_strerror (err));
+        }
+      else
+        {
+          err = gpgtar_list (fname, !skip_crypto);
+          if (err && !log_get_errorcount (0))
+            log_error ("listing archive failed: %s\n", gpg_strerror (err));
+        }
       break;
 
     case aEncrypt:
@@ -530,19 +540,6 @@ main (int argc, char **argv)
         log_error ("creating archive failed: %s\n", gpg_strerror (err));
       break;
 
-    case aDecrypt:
-      if (argc != 1)
-        gpgrt_usage (1);
-      if (opt.outfile)
-        log_info ("note: ignoring option --output\n");
-      if (files_from)
-        log_info ("note: ignoring option --files-from\n");
-      fname = argc ? *argv : NULL;
-      err = gpgtar_extract (fname, !skip_crypto);
-      if (err && log_get_errorcount (0) == 0)
-        log_error ("extracting archive failed: %s\n", gpg_strerror (err));
-      break;
-
     default:
       log_error (_("invalid command (there is no implicit command)\n"));
       break;