core: Support usage of gpgtar for decrypting an encrypted archive

* src/gpgme.h.in (GPGME_DECRYPT_ARCHIVE): New decryption flag.
* src/engine-gpg.c (gpg_decrypt): Set use_gpgtar engine flag if
GPGME_DECRYPT_ARCHIVE flag is set. Check for new enough gpg and
incompatible flags. Use add_gpg_arg_with_value for gpg-only options
with a value and add_gpg_arg for gpg-only options without a value.
Set extra options for gpgtar and pass input data to stdin when using
gpgtar.

* tests/run-decrypt.c (show_usage): New options --archive and
--directory.
(main): Parse new options. Decrypt with gpgtar if --archive is given.
Set file name of output data to value of --directory option.
--

GnuPG-bug-id: 6342

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/run-decrypt.c b/tests/run-decrypt.c
index cf719925..ee49ead6 100644
--- a/tests/run-decrypt.c
+++ b/tests/run-decrypt.c
@@ -91,6 +91,8 @@ show_usage (int ex)
          "  --unwrap         remove only the encryption layer\n"
          "  --large-buffers  use large I/O buffer\n"
          "  --sensitive      mark data objects as sensitive\n"
+         "  --archive        extract files from an encrypted archive\n"
+         "  --directory DIR  extract the files into the directory DIR\n"
          "  --diagnostics    print diagnostics\n"
          , stderr);
   exit (ex);
@@ -113,6 +115,7 @@ main (int argc, char **argv)
   int export_session_key = 0;
   const char *override_session_key = NULL;
   const char *request_origin = NULL;
+  const char *directory = NULL;
   int no_symkey_cache = 0;
   int ignore_mdc_error = 0;
   int raw_output = 0;
@@ -205,6 +208,19 @@ main (int argc, char **argv)
           raw_output = 1;
           argc--; argv++;
         }
+      else if (!strcmp (*argv, "--archive"))
+        {
+          flags |= GPGME_DECRYPT_ARCHIVE;
+          argc--; argv++;
+        }
+      else if (!strcmp (*argv, "--directory"))
+        {
+          argc--; argv++;
+          if (!argc)
+            show_usage (1);
+          directory = *argv;
+          argc--; argv++;
+        }
       else if (!strncmp (*argv, "--", 2))
         show_usage (1);
 
@@ -302,6 +318,16 @@ main (int argc, char **argv)
                gpgme_strerror (err));
       exit (1);
     }
+  if (directory && (flags & GPGME_DECRYPT_ARCHIVE))
+    {
+      err = gpgme_data_set_file_name (out, directory);
+      if (err)
+        {
+          fprintf (stderr, PGM ": error setting file name (out): %s\n",
+                   gpgme_strerror (err));
+          exit (1);
+        }
+    }
   if (large_buffers)
     {
       err = gpgme_data_set_flag (out, "io-buffer-size", "1000000");