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.\" ========================================================================
.\"
.IX Title "PRISTINE-GZ 1"
.TH PRISTINE-GZ 1 2024-03-12 "perl v5.38.2" pristine-gz
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.SH NAME
pristine\-gz \- regenerate pristine gz files
.SH SYNOPSIS
.IX Header "SYNOPSIS"
\&\fBpristine-gz\fR [OPTIONS] gendelta \fIfile.gz\fR \fIdelta\fR
.PP
\&\fBpristine-gz\fR [OPTIONS] gengz \fIdelta\fR \fIfile\fR
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This is a complement to the \fBpristine\-tar\fR\|(1) command. Normally you don't
need to run it by hand, since pristine-tar calls it as necessary to handle
\&.tar.gz files.
.PP
pristine-gz gendelta takes the specified \fIgz\fR file, and generates a
small binary \fIdelta\fR file that can later be used by pristine-gz gengz
to recreate the original file.
.PP
pristine-gz gengz takes the specified \fIdelta\fR file, and compresses
the specified input \fIfile\fR (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.
.PP
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 \fBgzip\fR\|(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.
.PP
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.
.PP
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.
.PP
If the delta filename is "\-", pristine-gz reads or writes it to stdio.
.SH OPTIONS
.IX Header "OPTIONS"
.IP \-v 4
.IX Item "-v"
.PD 0
.IP \-\-verbose 4
.IX Item "--verbose"
.PD
Verbose mode, show each command that is run.
.IP \-d 4
.IX Item "-d"
.PD 0
.IP \-\-debug 4
.IX Item "--debug"
.PD
Debug mode.
.IP \-k 4
.IX Item "-k"
.PD 0
.IP \-\-keep 4
.IX Item "--keep"
.PD
Don't clean up the temporary directory on exit.
.SH ENVIRONMENT
.IX Header "ENVIRONMENT"
.IP \fBTMPDIR\fR 4
.IX Item "TMPDIR"
Specifies a location to place temporary files, other than the default.
.SH AUTHOR
.IX Header "AUTHOR"
Joey Hess <joeyh@debian.org>,
Faidon Liambotis <paravoid@debian.org>
Josh Triplett <josh@joshtriplett.org>
.PP
Licensed under the GPL, version 2.