pristine-gz - regenerate pristine gz files

       Joey     Hess     <joeyh@debian.org>,    Faidon    Liambotis    <paravoid@debian.org>    Josh    Triplett
       <josh@joshtriplett.org>

       Licensed under the GPL, version 2.

perl v5.38.2                                       2024-04-01                                     PRISTINE-GZ(1)

       This is a complement to the pristine-tar(1) command. Normally you don't need to run it by hand, since
       pristine-tar calls it as necessary to handle .tar.gz files.

       pristine-gz gendelta takes the specified gz file, and generates a small binary delta file that can later
       be used by pristine-gz gengz to recreate the original file.

       pristine-gz gengz takes the specified delta file, and compresses the specified input file (which must be
       identical to the contents of the original gz file). The resulting file will be identical to the original
       gz file used to create the delta.

       The approach used to regenerate the original gz file is to figure out how it was produced -- what
       compression level was used, whether it was built with GNU gzip(1) or with a library or BSD version,
       whether the --rsyncable option was used, etc, and to reproduce this build environment when regenerating
       the gz.

       This approach will work for about 99.5% of cases. One example of a case it cannot currently support is a
       gz file that has been produced by appending together multiple gz files.

       For the few where it doesn't work, a binary diff will be included in the delta between the closest
       regneratable gz file and the original. In the worst case, the diff will include the entire content of the
       original gz file, resulting in a larger than usual delta. If the delta is much larger than usual,
       pristine-gz will print a warning.

       If the delta filename is "-", pristine-gz reads or writes it to stdio.

TMPDIR
           Specifies a location to place temporary files, other than the default.

       pristine-gz - regenerate pristine gz files

       -v
       --verbose
           Verbose mode, show each command that is run.

       -d
       --debug
           Debug mode.

       -k
       --keep
           Don't clean up the temporary directory on exit.

pristine-gz [OPTIONS] gendelta file.gzdeltapristine-gz [OPTIONS] gengz deltafile