Multi-part issue ?

Help
Mike-17
2013-05-07
2013-05-13
  • Mike-17
    Mike-17
    2013-05-07

    I used 7zip to backup some data before upgrading from Ubuntu 12.10 to 13.04. I used multipart (slice of 1024MB) with the GUI file-roller tool.
    Now I installed the 13.04 system, and I have an issue with multi-part 7z archives. All my archives single-part could be restored, all the multi-part have the same problem: when using GUI (file-roller) it asks me a password to deflate, but I never used a password while compressing, 7z tool returns an error. Here are some terminal display for one of my multi-part achives:

    • 6 files (multi-part, not password-protected)
      $ ls -trl
      total 5948056
      -rw-rw-r-- 1 mike17 mike17 1073741824 avril 27 07:43 Documents.7z.001
      -rw-rw-r-- 1 mike17 mike17 1073741824 avril 27 07:44 Documents.7z.002
      -rw-rw-r-- 1 mike17 mike17 1073741824 avril 27 07:44 Documents.7z.003
      -rw-rw-r-- 1 mike17 mike17 1073741824 avril 27 07:45 Documents.7z.004
      -rw-rw-r-- 1 mike17 mike17 1073741824 avril 27 07:45 Documents.7z.005
      -rw-rw-r-- 1 mike17 mike17 722075385 avril 27 07:46 Documents.7z.006

    • Archive integrity seems OK:
      $ 7z t Documents.7z.001

      7-Zip 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18
      p7zip Version 9.20 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)

      Processing archive: Documents.7z.001

      Testing Documents.7z

      Everything is Ok

      Size: 6090784505
      Compressed: 1073741824

    • Extraction seems OK:
      $ 7z x Documents.7z.001

      7-Zip 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18
      p7zip Version 9.20 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)

      Processing archive: Documents.7z.001

      Extracting Documents.7z

      Everything is Ok

      Size: 6090784505
      Compressed: 1073741824

    • Despite the fact all seems OK, final extraction fails:
      $ file Documents.7z
      Documents.7z: 7-zip archive data, version 0.3
      $

      $ 7z x Documents.7z

      7-Zip 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18
      p7zip Version 9.20 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)

      Processing archive: Documents.7z

      Error: Can not open file as archive

      $

    • This issue seems like the one from the post "Error: Can not open file as archive". I cannot solve my issue.
      In this post, Igor asked 1) first 48 bytes of first multi-part archive, 2) last 128 bytes of last archive
      so here they are:

    • head of first archive
      $ hexdump -n 48 Documents.7z.001
      0000000 7a37 afbc 1c27 0300 0000 0000 0000 0000
      0000010 0000 0000 0000 0000 0000 0000 0000 0000
      0000020 1700 ca9b 6d07 d826 c1fe 0455 835c 9647
      0000030

    • tail of last archive
      $ hexdump -s 722075257 Documents.7z.006
      2b09fe79 5bb2 ece3 ad4a a539 b61c 330e 6d22 c139
      2b09fe89 9e96 fd2c 45d4 cc78 0428 0b5e 2507 84b9
      2b09fe99 0629 1c0a 79f4 290c 814b 652b 699a 8abc
      2b09fea9 177c 7ba6 ef4b 7348 2f02 ebb0 6eaa b1f1
      2b09feb9 96db 7be8 1e18 3400 192d 14bc 307e 93ff
      2b09fec9 8da2 e10c fc55 60c2 b57c a49c 7380 9484
      2b09fed9 fa70 25b1 2118 70b2 fa01 f5b8 cd27 03f9
      2b09fee9 f741 cbca fcef 0cfc 3492 9dc3 7b3c de8e
      2b09fef9

    Thanks to anyone who can help me.

     
  • Mike-17
    Mike-17
    2013-05-13

    Thank you for the link Igor. I will hardly try to follow the procedure. It might be a pain because archive contained hundred of files.
    I will also try the parser named "hachoir" (https://bitbucket.org/haypo/hachoir) which may help in this task.