Re: [Bug-tar] Extracting from a single volume in a multi-volume archive fails

[Sergey Poznyakoff]

Hi Göran,

> freddi$$ tar --extract --blocking-factor=1 --file=x2.tar c
> tar: b: Cannot extract -- file is continued from another volume
> tar: c: Not found in archive

That is definitely a bug.  Thanks for reporting it.  Attached is a patch
that allows to continue extracting in such cases.  Note, however, that
in order to extract a split member (i.e. the one contained in several
volumes), you will always have to start from the volume that contains
its beginning, as the documentation says:

         If an archive member is split across volumes (i.e., its entry begins
      on one volume of the media and ends on another), you need to specify
      `--multi-volume' to extract it successfully.  In this case, you should
      load the volume where the archive member starts, and use `tar --extract
      --multi-volume'--`tar' will prompt for later volumes as it needs them.

Regards,
Sergey

diff --git a/src/extract.c b/src/extract.c
index 327b67f..faee4eb 100644
--- a/src/extract.c
+++ b/src/extract.c
@@ -1421,6 +1421,13 @@ extract_failure (char *file_name, int typeflag)
   return 1;
 }

+static int
+extract_skip (char *file_name, int typeflag)
+{
+  skip_member ();
+  return 0;
+}
+
 typedef int (*tar_extractor_t) (char *file_name, int typeflag);

 
@@ -1501,7 +1508,7 @@ prepare_to_extract (char const *file_name, int typeflag, 
tar_extractor_t *fun)
       ERROR ((0, 0,
              _("%s: Cannot extract -- file is continued from another volume"),
              quotearg_colon (current_stat_info.file_name)));
-      *fun = extract_failure;
+      *fun = extract_skip;
       break;

     case GNUTYPE_LONGNAME: