5 dh_compress - compress files and fix symlinks in package build directories
11 use Debian::Debhelper::Dh_Lib;
15 dh_compress [debhelper options] [-Xitem] [-A] [file ...]
19 dh_compress is a debhelper program that is responsible for compressing
20 the files in package build directories, and makes sure that any symlinks
21 that pointed to the files before they were compressed are updated to point
24 By default, dh_compress compresses files that debian policy mandates should
25 be compressed, namely all files in usr/share/info, usr/share/man,
26 usr/X11R6/man, and all files in usr/share/doc that are larger than 4k in size,
27 (except the copyright file, .html files and .gif files), and all changelog
28 files. It skips any files that appear to be already compressed (based on their
31 If a debian/package.compress file exists, however, it will be ran as a shell
32 script, and all filenames that the shell script outputs will be compressed
33 instead of the default files. The shell script will be run from
34 inside the package build directory. Note though that using -X is a much
35 better idea in general; you should only use a debian/package.compress file
36 if you really have to.
42 =item B<-X>I<item>, B<--exclude=>I<item>
44 Exclude files that contain "item" anywhere in their filename from being
45 compressed. For example, -X.jpeg will exclude jpeg's from compression.
46 You may use this option multiple times to build up a list of things to
47 exclude. You can accomplish the same thing by using a debian/compress file,
52 Compress all files specified by command line parameters in ALL packages
57 Add these files to the list of files to compress.
63 Debian policy, version 3.0
69 foreach my $package (@{$dh{DOPACKAGES}}) {
70 my $tmp=tmpdir($package);
71 my $compress=pkgfile($package,"compress");
73 # Run the file name gathering commands from within the directory
74 # structure that will be effected.
76 verbose_print("cd $tmp");
77 chdir($tmp) || error("Can't cd to $tmp: $!");
79 # Figure out what files to compress.
81 # First of all, deal with any files specified right on the command line.
82 if (($package eq $dh{FIRSTPACKAGE} || $dh{PARAMS_ALL}) && @ARGV) {
86 # The config file is a sh script that outputs the files to be compressed
87 # (typically using find).
88 push @files, split(/\n/,`sh $olddir/$compress 2>/dev/null`);
91 # Note that all the excludes of odd things like _z
92 # are because gzip refuses to compress such files, assumming
93 # they are zip files. I looked at the gzip source to get the
94 # complete list of such extensions: ".gz", ".z", ".taz",
95 # ".tgz", "-gz", "-z", "_z"
96 push @files, split(/\n/,`
97 find usr/info usr/share/info usr/man usr/share/man usr/X11*/man -type f ! -name "*.gz" 2>/dev/null || true;
98 find usr/doc usr/share/doc -type f \\( -size +4k -or -name "changelog*" \\) \\
99 \\( -name changelog.html -or ! -iname "*.htm*" \\) \\
100 ! -iname "*.gif" ! -iname "*.png" ! -iname "*.jpg" ! -iname "*.jpeg" ! -iname "*.gz" \\
101 ! -iname "*.taz" ! -iname "*.tgz" ! -iname "*.z" ! -iname "*.bz2" \\
102 ! -iname "*-gz" ! -iname "*-z" ! -iname "*_z" \\
103 ! -name "copyright" 2>/dev/null || true
107 # Exclude files from compression.
108 if (@files && defined($dh{EXCLUDE}) && $dh{EXCLUDE}) {
112 foreach my $x (@{$dh{EXCLUDE}}) {
123 # Look for files with hard links. If we are going to compress both,
124 # we can preserve the hard link across the compression and save
130 my ($dev, $inode, undef, $nlink)=stat($_);
132 if (! $seen{"$inode.$dev"}) {
133 $seen{"$inode.$dev"}=$_;
137 # This is a hardlink.
138 $hardlinks{$_}=$seen{"$inode.$dev"};
147 # Make executables not be anymore.
148 xargs(\@f,"chmod","a-x");
150 xargs(\@f,"gzip","-9f");
153 # Now change over any files we can that used to be hard links so
155 foreach (keys %hardlinks) {
157 doit("rm","-f","$_");
159 doit("ln","$hardlinks{$_}.gz","$_.gz");
162 verbose_print("cd '$olddir'");
165 # Fix up symlinks that were pointing to the uncompressed files.
166 open (FIND,"find $tmp -type l |");
169 my ($directory)=m:(.*)/:;
170 my $linkval=readlink($_);
171 if (! -e "$directory/$linkval" && -e "$directory/$linkval.gz") {
173 doit("ln","-sf","$linkval.gz","$_.gz");
182 This program is a part of debhelper.
186 Joey Hess <joeyh@debian.org>