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#!/usr/bin/perl
# $Id: compress_files 271302 2010-11-22 01:42:52Z fwang $
# compress man and info pages.
use strict;
use warnings;
use Cwd;
use File::Find;
use File::Basename;
use Fcntl ':mode';
my $ext = $ARGV[0] ||= '.gz';
die "Unknown extension $ext" unless $ext =~ /^\.(?:gz|bz2|lzma|xz)$/;
my $buildroot = $ENV{RPM_BUILD_ROOT};
die "No build root defined" unless $buildroot;
die "Invalid build root" unless -d $buildroot;
# normalize build root
$buildroot =~ s|/$||;
my $exclude_pattern = $ENV{EXCLUDE_FROM_COMPRESS} ?
qr/$ENV{EXCLUDE_FROM_COMPRESS}/ : undef;
my @sodirs = map { "$buildroot/$_" } qw(
usr/man
usr/X11R6/man
usr/lib/perl5/man
);
my @mandirs = map { "$buildroot/$_" } qw(
usr/info
usr/share/info
usr/man
usr/share/man
usr/X11/man
usr/lib/perl5/man
);
# Convert man pages from old locations just consisting
# of a single include directive to a symlink
my (@sofiles, @sodests);
sub so_function {
local ($_) = @_;
# skip symlinks
return if -l $_;
# skip directories
return if -d $_;
# The -s test is becuase a .so file tends to be small. We don't want
# to open every man page. 1024 is arbitrary.
return if -s $_ > 1024;
# skip excluded files
return if $exclude_pattern && $File::Find::name =~ $exclude_pattern;
# Test first line of file for the .so thing.
open(my $in, $_);
my $line = <$in>;
close($in);
if ($line =~ m/\.so\s+(.*)/) {
my $solink = $1;
# This test is here to prevent links like ... man8/../man8/foo.8
if (basename($File::Find::dir) eq dirname($solink)) {
$solink = basename($solink);
} else {
$solink = "../$solink";
}
push @sofiles, $File::Find::name;
push @sodests, $solink;
}
}
foreach my $dir (@sodirs) {
File::Find::find(\&so_function, $dir) if -e $dir;
}
foreach my $sofile (@sofiles) {
my $sodest = shift(@sodests);
unlink $sofile;
symlink $sodest, $sofile;
}
# find non-compressed info/man pages
my @files;
sub function {
local ($_) = @_;
# skip symlinks
return if -l $_;
# skip directories
return if -d $_;
# skip excluded files
return if $exclude_pattern && $File::Find::name =~ $exclude_pattern;
# skip compressed files
return if /\.(?:gz|bz2|lzma|xz)$/;
# skip particular files
return if $_ eq 'dir' || $_ eq 'whatis';
push @files, $File::Find::name;
}
foreach my $dir (@mandirs) {
File::Find::find(\&function, $dir) if -e $dir;
}
# uncompress info/man pages using another format
uncompress_files('.gz', 'gzip') if $ext ne '.gz';
uncompress_files('.bz2', 'bzip2') if $ext ne '.bz2';
uncompress_files('.lzma', 'lzma') if $ext ne '.lzma';
uncompress_files('.xz', 'xz') if $ext ne '.xz';
# drop executable bits
foreach my $file (@files) {
my $mode = (stat($file))[2];
chmod($mode & ~S_IXUSR & ~S_IXGRP & ~S_IXOTH, $file);
}
if (@files) {
my @command = $ext eq '.gz' ? qw(gzip -9f)
: $ext eq '.bz2' ? qw(bzip2 -9f)
: $ext eq '.lzma' ? qw(lzma -9f --text)
: $ext eq '.xz' ? qw(xz -f)
: qw()
;
xargs(\@files, @command)
or die "Something wrong with the man/info file compression";
}
# Fix up symlinks that were pointing to the uncompressed files.
sub link_function {
local ($_) = @_;
# skip everything but symlinks
return unless -l $_;
# skip non-dangling symlinks
my $linkval = readlink($_);
return if -e "$File::Find::dir/$linkval";
if (-e "$File::Find::dir/$linkval$ext") {
unlink $_;
symlink "$linkval$ext", "$_$ext";
} elsif ($File::Find::dir =~ m|man/|) {
# Bad link go on nowhere (any better idea) ?
unlink $_;
}
}
File::Find::find(\&link_function, $buildroot);
# Run a command that may have a huge number of arguments, like xargs does.
# Pass in a reference to an array containing the arguments, and then other
# parameters that are the command and any parameters that should be passed to
# it each time.
sub xargs {
my $args = shift;
# The kernel can accept command lines up to 20k worth of characters.
my $command_max = 20000;
# Figure out length of static portion of command.
my $static_length = 0;
foreach (@_) {
$static_length += length($_) + 1;
}
my @collect;
my $length = $static_length;
foreach my $arg (@$args) {
if (length($arg) + 1 + $static_length > $command_max) {
error(qq(This command is greater than the maximum command size allowed by the kernel, and cannot be split up further. What on earth are you doing? "@_ $_"));
}
$length += length($arg) + 1;
if ($length < $command_max) {
push @collect, $arg;
} else {
system(@_, @collect) if @collect > 0;
@collect = $arg;
$length = $static_length + length($arg) + 1;
}
}
system(@_, @collect) == 0 if @collect > 0;
}
# uncompress info/man pages with a given extension
sub uncompress_files {
my ($extension, $command) = @_;
my @compressed_files;
foreach my $dir (@mandirs) {
File::Find::find(sub {
local ($_) = @_;
# skip symlinks
return if -l $_;
# skip directories
return if -d $_;
# skip excluded files
return if $exclude_pattern && $File::Find::name =~ $exclude_pattern;
# skip everything but files with wanted extension
return if !/$extension$/;
push @compressed_files, $File::Find::name;
}, $dir) if -e $dir;
}
if (@compressed_files) {
xargs(\@compressed_files, $command, "-d")
or die "Something wrong with the decompression of the $extension man/info file";
my $length = length($extension);
push(@files, map { substr($_, 0, -$length) } @compressed_files);
}
}
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