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       debdelta - compute changes between Debian packages




       This  program  computes  changes  between  Debian packages FROMFILE and
       TOFILE. These changes are stored in the file DELTA.  The DELTA file may
       later  be  used  by  the  "debpatch"  program  to  recreate TOFILE from
       FROMFILE. In  a  sense,  the  pair  of  programs  "debdelta"/"debpatch"
       operate  on  Debian  packages  similar  to  how the pair "diff"/"patch"
       operate on text files; indeed, the output of "debdelta" may be used  to
       store  and  transmit  only  the  changes  between Debian packages; but,
       contrary to the "diff" output, the output of "debdelta"  is  not  human
       readable,  but  rather  it  is  intended to be as small as possible (to
       optimize for less disk usage and/or faster transmission).


       --signing-key KEY
              key used to sign the delta (using GnuPG).

              do not include MD5 info in delta.

              create a patch that  can  only  be  used  if  the  old  .deb  is

       --delta-algo ALGO
              use  a  specific  backend  for  computing binary diffs; possible
              values are: xdelta xdelta-bzip xdelta3 bsdiff

       -M Mb  maximum memory  to use (for ’bsdiff’ or ’xdelta’).

       -v     verbose (can be added multiple times).

       -d     print full traceback on  Python  errors;  save  useful  info  in
              temporary files in case that a backend crashes.

              (If  ’-d’  is  added multiple times, it also adds to the patches
              other extra debugging checks: only for advanced bug tracking).

       -k     keep temporary files (use for debugging).

              specify  a  different  home  for  GnuPG,  default  for  root  is
              /etc/debdelta/gnupg   while   for  other  users  is  unset.  See
              --homedir in gpg(1) for details.

       --disable-feature FEATURE
              disable  an  internal  feature.   See   the   documentation   in


       The command
       debdelta libglib_2.12_all.deb libglib_2.14_all.deb /tmp/glib.debdelta
       will  express  the  difference  between  two  versions  of  libglib  in
       /tmp/glib.debdelta ; the command
       debpatch -A /tmp/glib.debdelta libglib_2.12_all.deb /tmp/glib.deb
       will create in /tmp/glib.deb a perfect copy of libglib_2.14_all.deb.


       A Debian package that  is  recreated  using  debpatch  is  byte-by-byte
       identical   to   the   original   one;  so  the  cryptographic  archive
       authentication support for APT (see apt-secure(8)  )  may  be  used  to
       assert  that  it  can be trusted to be installed. Moreover, if  a GnuPG
       key is specified using --signing-key then  the  delta  file  itself  is
       cryptograhically  protected  using GnuPG, MD5 and SHA1  (using the same
       method as dpkg-sig(1) ).  Note that, for non-root  users,   the  master
       debdelta      keyring      /usr/share/keyrings/debian-debdelta-archive-
       keyring.gpg is added to the list of keyrings for gnupg.


       0      if OK,

       1      if there was a retriable problem (e.g., out-of-disk-space, or an
              auxiliary  program  such ’lzma’ is missing and the user is asked
              to install the package ’lzma’),

       2      if there was a non-retriable problem,

       3      if there was an  error  in  a   command-line  option,  or  in  a
              configuration file,

       4      if there is an internal error, and

       5      if exited due to keyboard interrupt.


       Report bugs to <>.


       Debdelta was written and is copyright © 2006-09 Andrea Mennucci.
       This     man     page     was     written    by    Jegou    Pierre-yves


       This is free software.  You may redistribute copies  of  it  under  the
       terms     of     the     GNU    Library    General    Public    License
       <>.  There is NO WARRANTY,  to
       the extent permitted by law.


       debdelta-upgrade(1),             debpatch(1),             debdeltas(1),