Fix handling of hard link targets by -c --transform

[chaz/tar] / src / list.c

diff --git a/src/list.c b/src/list.c
index 2d05873d846b327a3e91aa4e6452ebf9865d5b39..98c1e396b3547cb22a5ac590bb24d03b03a9b521 100644 (file)
--- a/src/list.c
+++ b/src/list.c
@@ -1,13 +1,13 @@
 /* List a tar archive, with support routines for reading a tar archive.
 
    Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
 /* List a tar archive, with support routines for reading a tar archive.
 
    Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,

-   2001, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+   2001, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.

 
    Written by John Gilmore, on 1985-08-26.
 
    This program is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
 
    Written by John Gilmore, on 1985-08-26.
 
    This program is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the

-   Free Software Foundation; either version 2, or (at your option) any later
+   Free Software Foundation; either version 3, or (at your option) any later

    version.
 
    This program is distributed in the hope that it will be useful, but
    version.
 
    This program is distributed in the hope that it will be useful, but


@@ -76,7 +76,6 @@ read_and (void (*do_something) (void))
     {
       prev_status = status;
       tar_stat_destroy (&current_stat_info);
     {
       prev_status = status;
       tar_stat_destroy (&current_stat_info);

-      xheader_destroy (&extended_header);

 
       status = read_header (false);
       switch (status)
 
       status = read_header (false);
       switch (status)


@@ -107,7 +106,6 @@ read_and (void (*do_something) (void))
                {
                case GNUTYPE_VOLHDR:
                case GNUTYPE_MULTIVOL:
                {
                case GNUTYPE_VOLHDR:
                case GNUTYPE_MULTIVOL:

-               case GNUTYPE_NAMES:

                  break;
 
                case DIRTYPE:
                  break;
 
                case DIRTYPE:


@@ -281,8 +279,8 @@ tar_checksum (union block *header, bool silent)
 }
 
 /* Read a block that's supposed to be a header block.  Return its
 }
 
 /* Read a block that's supposed to be a header block.  Return its

-   address in "current_header", and if it is good, the file's size in
-   current_stat_info.stat.st_size.
+   address in "current_header", and if it is good, the file's size
+   and names (file name, link name) in *info.

 
    Return 1 for success, 0 if the checksum is bad, EOF on eof, 2 for a
    block full of zeros (EOF marker).
 
    Return 1 for success, 0 if the checksum is bad, EOF on eof, 2 for a
    block full of zeros (EOF marker).


@@ -294,7 +292,7 @@ tar_checksum (union block *header, bool silent)
    the header which this routine reads.  */
 
 enum read_header
    the header which this routine reads.  */
 
 enum read_header

-read_header (bool raw_extended_headers)
+read_header_primitive (bool raw_extended_headers, struct tar_stat_info *info)

 {
   union block *header;
   union block *header_copy;
 {
   union block *header;
   union block *header_copy;


@@ -303,8 +301,8 @@ read_header (bool raw_extended_headers)
   size_t size, written;
   union block *next_long_name = 0;
   union block *next_long_link = 0;
   size_t size, written;
   union block *next_long_name = 0;
   union block *next_long_link = 0;

-  size_t next_long_name_blocks;
-  size_t next_long_link_blocks;
+  size_t next_long_name_blocks = 0;
+  size_t next_long_link_blocks = 0;

 
   while (1)
     {
 
   while (1)
     {


@@ -321,9 +319,9 @@ read_header (bool raw_extended_headers)
       /* Good block.  Decode file size and return.  */
 
       if (header->header.typeflag == LNKTYPE)
       /* Good block.  Decode file size and return.  */
 
       if (header->header.typeflag == LNKTYPE)

-       current_stat_info.stat.st_size = 0;     /* links 0 size on tape */
+       info->stat.st_size = 0; /* links 0 size on tape */

       else
       else

-       current_stat_info.stat.st_size = OFF_FROM_HEADER (header->header.size);
+       info->stat.st_size = OFF_FROM_HEADER (header->header.size);

 
       if (header->header.typeflag == GNUTYPE_LONGNAME
          || header->header.typeflag == GNUTYPE_LONGLINK
 
       if (header->header.typeflag == GNUTYPE_LONGNAME
          || header->header.typeflag == GNUTYPE_LONGLINK


@@ -336,14 +334,13 @@ read_header (bool raw_extended_headers)
          else if (header->header.typeflag == GNUTYPE_LONGNAME
                   || header->header.typeflag == GNUTYPE_LONGLINK)
            {
          else if (header->header.typeflag == GNUTYPE_LONGNAME
                   || header->header.typeflag == GNUTYPE_LONGLINK)
            {

-             size_t name_size = current_stat_info.stat.st_size;
+             size_t name_size = info->stat.st_size;

              size_t n = name_size % BLOCKSIZE;
              size = name_size + BLOCKSIZE;
              if (n)
                size += BLOCKSIZE - n;
 
              size_t n = name_size % BLOCKSIZE;
              size = name_size + BLOCKSIZE;
              if (n)
                size += BLOCKSIZE - n;
 

-             if (name_size != current_stat_info.stat.st_size
-                 || size < name_size)
+             if (name_size != info->stat.st_size || size < name_size)

                xalloc_die ();
 
              header_copy = xmalloc (size + 1);
                xalloc_die ();
 
              header_copy = xmalloc (size + 1);


@@ -389,12 +386,16 @@ read_header (bool raw_extended_headers)
            }
          else if (header->header.typeflag == XHDTYPE
                   || header->header.typeflag == SOLARIS_XHDTYPE)
            }
          else if (header->header.typeflag == XHDTYPE
                   || header->header.typeflag == SOLARIS_XHDTYPE)

-           xheader_read (header, OFF_FROM_HEADER (header->header.size));
+           xheader_read (&info->xhdr, header,
+                         OFF_FROM_HEADER (header->header.size));

          else if (header->header.typeflag == XGLTYPE)
            {
          else if (header->header.typeflag == XGLTYPE)
            {

-             xheader_read (header, OFF_FROM_HEADER (header->header.size));
-             xheader_decode_global ();
-             xheader_destroy (&extended_header);
+             struct xheader xhdr;
+             memset (&xhdr, 0, sizeof xhdr);
+             xheader_read (&xhdr, header,
+                           OFF_FROM_HEADER (header->header.size));
+             xheader_decode_global (&xhdr);
+             xheader_destroy (&xhdr);

            }
 
          /* Loop!  */
            }
 
          /* Loop!  */


@@ -434,9 +435,9 @@ read_header (bool raw_extended_headers)
              recent_long_name = 0;
              recent_long_name_blocks = 0;
            }
              recent_long_name = 0;
              recent_long_name_blocks = 0;
            }

-         assign_string (&current_stat_info.orig_file_name, name);
-         assign_string (&current_stat_info.file_name, name);
-         current_stat_info.had_trailing_slash = strip_trailing_slashes (current_stat_info.file_name);
+         assign_string (&info->orig_file_name, name);
+         assign_string (&info->file_name, name);
+         info->had_trailing_slash = strip_trailing_slashes (info->file_name);

 
          if (recent_long_link)
            free (recent_long_link);
 
          if (recent_long_link)
            free (recent_long_link);


@@ -455,13 +456,60 @@ read_header (bool raw_extended_headers)
              recent_long_link = 0;
              recent_long_link_blocks = 0;
            }
              recent_long_link = 0;
              recent_long_link_blocks = 0;
            }

-         assign_string (&current_stat_info.link_name, name);
+         assign_string (&info->link_name, name);

 
          return HEADER_SUCCESS;
        }
     }
 }
 
 
          return HEADER_SUCCESS;
        }
     }
 }
 

+enum read_header
+read_header (bool raw_extended_headers)
+{
+  return read_header_primitive (raw_extended_headers, &current_stat_info);
+}
+
+static char *
+decode_xform (char *file_name, void *data)
+{
+  int type = *(int*)data;
+
+  switch (type)
+    {
+    case XFORM_SYMLINK:
+      /* FIXME: It is not quite clear how and to which extent are the symbolic
+        links subject to filename transformation.  In the absence of another
+        solution, symbolic links are exempt from component stripping and
+        name suffix normalization, but subject to filename transformation
+        proper. */ 
+      return file_name;
+      
+    case XFORM_LINK:
+      file_name = safer_name_suffix (file_name, true, absolute_names_option);
+      break;
+      
+    case XFORM_REGFILE:
+      file_name = safer_name_suffix (file_name, false, absolute_names_option);
+      break;
+    }
+  
+  if (strip_name_components)
+    {
+      size_t prefix_len = stripped_prefix_len (file_name,
+                                              strip_name_components);
+      if (prefix_len == (size_t) -1)
+       prefix_len = strlen (file_name);
+      file_name += prefix_len;
+    }
+  return file_name;
+}
+
+bool
+transform_member_name (char **pinput, int type)
+{
+  return transform_name_fp (pinput, type, decode_xform, &type);
+}
+

 #define ISOCTAL(c) ((c)>='0'&&(c)<='7')
 
 /* Decode things from a file HEADER block into STAT_INFO, also setting
 #define ISOCTAL(c) ((c)>='0'&&(c)<='7')
 
 /* Decode things from a file HEADER block into STAT_INFO, also setting


@@ -491,7 +539,7 @@ decode_header (union block *header, struct tar_stat_info *stat_info,
          && ISOCTAL (header->star_header.ctime[0])
          && header->star_header.ctime[11] == ' ')
        format = STAR_FORMAT;
          && ISOCTAL (header->star_header.ctime[0])
          && header->star_header.ctime[11] == ' ')
        format = STAR_FORMAT;

-      else if (extended_header.size)
+      else if (stat_info->xhdr.size)

        format = POSIX_FORMAT;
       else
        format = USTAR_FORMAT;
        format = POSIX_FORMAT;
       else
        format = USTAR_FORMAT;


@@ -579,6 +627,17 @@ decode_header (union block *header, struct tar_stat_info *stat_info,
           || stat_info->dumpdir)
        stat_info->is_dumpdir = true;
     }
           || stat_info->dumpdir)
        stat_info->is_dumpdir = true;
     }

+
+  transform_member_name (&stat_info->file_name, XFORM_REGFILE);
+  switch (header->header.typeflag)
+    {
+    case SYMTYPE:
+      transform_member_name (&stat_info->link_name, XFORM_SYMLINK);
+      break;
+      
+    case LNKTYPE:
+      transform_member_name (&stat_info->link_name, XFORM_LINK);
+    }

 }
 
 /* Convert buffer at WHERE0 of size DIGS from external format to
 }
 
 /* Convert buffer at WHERE0 of size DIGS from external format to


@@ -975,7 +1034,7 @@ print_header (struct tar_stat_info *st, off_t block_ordinal)
   char modes[11];
   char const *time_stamp;
   int time_stamp_len;
   char modes[11];
   char const *time_stamp;
   int time_stamp_len;

-  char *temp_name = st->orig_file_name ? st->orig_file_name : st->file_name;
+  char *temp_name;

 
   /* These hold formatted ints.  */
   char uform[UINTMAX_STRSIZE_BOUND], gform[UINTMAX_STRSIZE_BOUND];
 
   /* These hold formatted ints.  */
   char uform[UINTMAX_STRSIZE_BOUND], gform[UINTMAX_STRSIZE_BOUND];


@@ -989,21 +1048,8 @@ print_header (struct tar_stat_info *st, off_t block_ordinal)
   if (test_label_option && current_header->header.typeflag != GNUTYPE_VOLHDR)
     return;
 
   if (test_label_option && current_header->header.typeflag != GNUTYPE_VOLHDR)
     return;
 

-  if (show_stored_names_option)
-    {
-      switch (subcommand_option)
-       {
-       case CAT_SUBCOMMAND:
-       case UPDATE_SUBCOMMAND:
-       case APPEND_SUBCOMMAND:
-       case CREATE_SUBCOMMAND:
-         temp_name = st->file_name ? st->file_name : st->orig_file_name;
-         break;
-
-       default:
-         temp_name = st->orig_file_name ? st->orig_file_name : st->file_name;
-       }
-    }
+  if (show_transformed_names_option)
+    temp_name = st->file_name ? st->file_name : st->orig_file_name;

   else
     temp_name = st->orig_file_name ? st->orig_file_name : st->file_name;
 
   else
     temp_name = st->orig_file_name ? st->orig_file_name : st->file_name;
 


@@ -1038,10 +1084,6 @@ print_header (struct tar_stat_info *st, off_t block_ordinal)
          modes[0] = 'M';
          break;
 
          modes[0] = 'M';
          break;
 

-       case GNUTYPE_NAMES:
-         modes[0] = 'N';
-         break;
-

        case GNUTYPE_LONGNAME:
        case GNUTYPE_LONGLINK:
          modes[0] = 'L';
        case GNUTYPE_LONGNAME:
        case GNUTYPE_LONGLINK:
          modes[0] = 'L';


@@ -1225,10 +1267,6 @@ print_header (struct tar_stat_info *st, off_t block_ordinal)
                   uintbuf));
          fprintf (stdlis, _("--Continued at byte %s--\n"), size);
          break;
                   uintbuf));
          fprintf (stdlis, _("--Continued at byte %s--\n"), size);
          break;

-
-       case GNUTYPE_NAMES:
-         fprintf (stdlis, _("--Mangled file names--\n"));
-         break;

        }
     }
   fflush (stdlis);
        }
     }
   fflush (stdlis);