"Fossies" - the Fresh Open Source Software Archive

Member "afio-2.5.2/script3/afio_pack_gpg_zip" (30 Nov 2018, 1733 Bytes) of package /linux/misc/afio-2.5.2.tgz:

    1 #!/bin/bash
    2 #
    3 # This example shows how to configure afio to write GnuPG encrypted archives.
    4 
    5 # GnuPG is a complete and free replacement for PGP. Because it does not use
    6 # IDEA or RSA it can be used without any restrictions. GnuPG is a RFC2440
    7 # (OpenPGP) compliant application.
    8 
    9 # This example uses a pass phrase in a file, for increased security.
   10 # the file permissions of this file should be set to -rw--------
   11 # (group and world unreadable) to keep the pass phrase secure
   12 
   13 dir_to_backup=/usr/include/linux
   14 passphrasefile=my_passphrasefile
   15 
   16 # gpg has built-in compression but this feature cannot be used with
   17 # afio (it should be disabled using the -z 0 to gpg). In this example
   18 # we compress the files in the archive anyway by first passing them
   19 # through gzip, then through gpg, using the auxillary script
   20 # gpg_zip_encrypt.
   21 
   22 find $dir_to_backup | afio -ovz -Z -U -P ./gpg_zip_encrypt -3 3 my_archive_file 3<$passphrasefile
   23 
   24 # The reason why gpg built-in compression cannot be used is as
   25 # follows. When compression is used, and gpg is run twice on the same
   26 # input file, it can generate differing outputs with different
   27 # lengths.  This is a problem for afio if the output length is larger
   28 # than the afio -M option value.  If the length is larger than the -M
   29 # value, then afio will call the 'compression' program twice, once to
   30 # get the 'compressed' file length and once to get the actual file
   31 # contents and write them to the archive, and if the lenght is bigger
   32 # in the second run then the data in the archive will be truncated
   33 # (and therefore corrupted).  Afio does emit an error message when
   34 # this happens, but it might be overlooked.
   35 
   36 # the archive written with this script can be unpacked with
   37 # afio_unpack_gpg_zip