Re: Extracting a single directory from a partial incremental dump?

At Tue, 18 Oct 2005 15:07:09 +0200,
Joerg Schilling wrote:
> Note that you need to start with creating a _new_ level 0 backup as
> the bug did cause the inode list for a directory to get corrupted on
> the aresultant archive.
> 
> The probability for this to happen was approx.: 1 : 40,000,000 this is
> why it took so long to be discovered.

Unfortunately, either the bug persists in version 1.5a67 or we're
subject to a misunderstanding.  When I execute the script below on my
system (Linux kernel 2.4.29, format 3.6 Reiser FS) I get output such as
the following, i.e. star panics:

  > ./star-test 
  Creating archive...
  Type of this level 0  dump: full
  Date of this level 0  dump: Fri Oct 28 18:27:02 2005
  Date of last level 0  dump: the epoch
  star: 1 blocks + 0 bytes (total of 10240 bytes = 10.00k).
  Dump record  level 0  dump: Fri Oct 28 18:27:02 2005 written
  Done.
  
  Extracting archive...
  Validating this dump against restored filesystem...
  Dump level 0 on empty filesystem, starting restore.
  star: pfind_node(): Not a directory 'B' for 'B/a' flags 0 i_dir 0.
  star: padd_node(): caller 'sym_addrec'.
  star: padd_node(): Not a directory 'B' for 'B/a' flags 0 i_dir 0.
  star: padd_node(B/a, 6, 0, 0) = NULL
  star: WARNING: No old inode number for 
  star: WARNING: No new inode number for 
  star: WARNING: No new inode number for /B
  star: Panic: cannot add node 'B/a'.

The script:

  #!/bin/bash
  
  source_dir="/media/hda2" && \
      archive_dir="/tmp/backup" && \
      extract_dir="/media/hda3" && \
      archive="$archive_dir/bla.tar" && \
      dumps="$archive_dir/bla.dumps" || exit $? 
  
  test "$source_dir" != "" && rm -rf "$source_dir"/* && \
      mkdir "$source_dir/A" "$source_dir/B" && \
      touch "$source_dir/A/a" "$source_dir/B/a" || exit $?
  
  rm -rf "$archive_dir" && \
      mkdir -p "$archive_dir" || exit $?
  
  echo "Creating archive..." && \
      touch "$dumps" && \
      star -c -xdev -level=0 tardumps="$dumps" -wtardumps file="$archive" \
      -C "$source_dir" . && \
      echo "Done." && \
      echo || exit $?
  
  echo "Extracting archive..." && \
      rm -rf $extract_dir/* && \
      star -xpU -restore -force-restore file="$archive" -C $extract_dir A && \
      echo "Done." || exit $?

Note that my real backup script utilizes many more star options than the
script above, and it creates a partial dump instead of a full dump.  For
testing purposes, though, I decided to keep things simple.
  
-- 
Felix E. Klee