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script/applypatch  view on Meta::CPAN

#!/usr/bin/perl -w
# applypatch -- apply a 'makepatch' generated patch kit.
# Author          : Johan Vromans
# Created On      : Sat Nov 14 14:34:28 1998
# Last Modified By: Johan Vromans
# Last Modified On: Fri Oct 26 21:52:01 2012
# Update Count    : 149
# Status          : Released

use strict;
use Getopt::Long 2.00;
use File::Basename;
use File::Spec;
use IO::File;
use Text::ParseWords;

################ Common stuff ################

my $my_package = 'Sciurix';
my $my_name    = "applypatch";
my $my_version = "2.05";
my $data_version = '1.0';

################ Globals ################

## Options and defaults.

my $dir;			# source directory
my $check = 0;			# check only
my $retain = 0;			# retain .orig files
my $patch = 'patch -p0 -N';	# patch command
my $verbose = 0;		# verbose processing
my $force = 0;			# allow continuation after trunc/corruption

# Development options (not shown with -help).
my $trace = 0;			# trace (show process)
my $test = 0;			# test (no actual processing)
my $debug = 0;			# extensive debugging info

## Misc

my $applypatch = 0;		# it's for us
my $timestamp;			# create date/time of patch kit
my @workq = ();			# work queue

## Subroutine prototypes

sub app_options ();
sub app_usage ($);
sub copy_input ();
sub execute_patch ();
sub post_patch ();
sub pre_patch ();
sub verify_files ();

################ Program parameters ################

app_options();
$trace ||= $debug;
$verbose ||= $trace;

################ Presets ################

$patch .= " -s" unless $verbose;
my $tmpfile = IO::File->new_tmpfile;

################ The Process ################

# Validate input and copy to temp file.
copy_input ();

# Change dir if requested.
(defined $dir) && (chdir ($dir) || die ("Cannot change to $dir: $!\n"));

# Verify that we are in the right place.
verify_files ();

# Exit if just checking.
die ("Okay\n") if $test && $check;
exit (0) if $check;

# Pre patch: create directories and files.
pre_patch ();

# Run the patch program.
execute_patch ();

# Post patch: adjust timestamps, remove obsolete files and directories.
post_patch ();

die ("Okay\n") if $test;
exit (0);

################ Subroutines ################

sub copy_input () {

    my $lines = 0;		# checksum: #lines
    my $bytes = 0;		# checksum: #bytes
    my $sum = 0;		# checksum: system V sum
    my $all_lines = 0;		# overall checksum: #lines
    my $all_bytes = 0;		# overall checksum: #bytes
    my $all_sum = 0;		# overall checksum: system V sum
    my $patchdata = 0;		# saw patch data
    my $pos = 0;		# start of patch data
    my $endkit = 0;		# saw end of kit
    my $fail = 0;		# failed
    my $patch_checksum_okay = 0;# checksum for the patch was okay

    print STDERR ("Validate input.\n") if $verbose;

    @ARGV = "-" if !@ARGV;
    for my $file (@ARGV) {
      my $argv = new IO::File;
      open($argv, $file) or die "Can't open $file: $!";
      binmode($argv);
      while ( <$argv> ) {
	chomp;
	if ( /^#### Patch data follows ####/ ) {

script/applypatch  view on Meta::CPAN

		  "aborting.\n");
	    die ("Use \"--force\" to override this.\n");
	}
    }

    print STDERR ("Source directory apparently okay.\n") if $verbose;
}

sub pre_patch () {

    foreach ( @workq ) {
	my ($op, $fn, $size, $mtime, $mode) = @$_;

	if ( $op eq 'C' ) {
	    $mode = oct($mode) & 0777;
	    $mode = 0777 unless $mode; # sanity
	    printf STDERR ("+ mkpath $fn 0%o\n", $mode) if $trace;
	    mkdir ($fn, $mode) 
	      || die ("Cannot create directory $fn: $!\n");
	}
    }

    foreach ( @workq ) {
	my ($op, $fn, $size, $mtime, $mode) = @$_;

	if ( $op eq 'c' ) {
	    #$mode = oct($mode) & 0777;
	    #$mode = 0666 unless $mode; # sanity
	    print STDERR ("+ create $fn\n") if $trace;
	    open (F, '>'.$fn)
	      || die ("Cannot create $fn: $!\n");
	    close (F);
	    #printf STDERR ("+ chmod 0%o $fn\n", $mode) if $trace;
	    #chmod ($mode, $fn)
	    #  || warn sprintf ("WARNING: Cannot chmod 0%o $fn: $!\n", $mode);
	}
    }

}


sub _open_patch () {

	my $p = new IO::File;
	$p->open("|$patch") || die ("Cannot open pipe to \"$patch\": $!\n");
	binmode($p);

	return $p
}


sub execute_patch () {

	my $p;

    print STDERR ("+ $patch\n") if $trace;
    if ( $applypatch ) {
	my $lines = 0;
	while ( <$tmpfile> ) {
	    chomp;
	    print STDERR ("++ ", $_, "\n") if $debug;
	    next if $_ eq "#### Patch data follows ####";
	    last if $_ eq "#### End of Patch data ####";
	    $p = _open_patch() unless $p;
	    print $p ($_, "\n");
	    $lines++;
	}
	print STDERR ("+ $lines lines sent to \"$patch\"\n") if $trace;
    }
    else {
	    while ( <$tmpfile> ) {
		    $p = _open_patch() unless $p;
		    print $p ($_)
	    }
    }
	defined $p and
	  $p->close || die ("Possible problems with \"$patch\", status = $?.\n");
}

sub set_utime ($$;$) {
    my ($fn, $mtime, $mode) = @_;
    $mode = (stat ($fn))[2] unless defined $mode;
    chmod (0777, $fn)
      || warn ("WARNING: Cannot utime/chmod a+rwx $fn: $!\n");
    print STDERR ("+ utime $fn $mtime (".localtime($mtime).")\n") if $trace;
    # Set times. Ignore errors for directories since some systems
    # (like MSWin32) do not allow directories to be stamped.
    utime ($mtime, $mtime, $fn)
      || -d $fn || warn ("WARNING: utime($mtime,$fn): $!\n");
    printf STDERR ("+ chmod 0%o $fn\n", $mode) if $trace;
    chmod ($mode, $fn)
      || warn sprintf ("WARNING: Cannot utime/chmod 0%o $fn: $!\n", $mode);
}

sub do_unlink ($) {
    my ($fn) = @_;
    my $mode = (stat($fn))[2];
    chmod (0777, $fn)
      || warn ("WARNING: Cannot unlink/chmod a+rwx $fn: $!\n");
    print STDERR ("+ unlink $fn\n") if $verbose;
    return if unlink ($fn);
    warn ("WARNING: Cannot remove $fn: $!\n");
    chmod ($mode, $fn)
      || warn sprintf ("WARNING: Cannot unlink/chmod 0%o $fn: $!\n", $mode);
}

sub do_rmdir ($) {
    my ($fn) = @_;
    my $mode = (stat($fn))[2];
    chmod (0777, $fn)
      || warn ("WARNING: Cannot rmdir/chmod a+rwx $fn: $!\n");
    print STDERR ("+ rmdir $fn\n") if $verbose;
    return if rmdir ($fn);
    warn ("WARNING: Cannot rmdir $fn: $!\n");
    chmod ($mode, $fn)
      || warn sprintf ("WARNING: Cannot rmdir/chmod 0%o $fn: $!\n", $mode);
}

sub post_patch () {

    my $suffix = $ENV{SIMPLE_BACKUP_SUFFIX} || ".orig";

    foreach ( @workq ) {
	my ($op, $fn, $size, $mtime, $mode) = @$_;

	if ( $op eq 'c' || $op eq 'C' || $op eq 'p' ) {
	    if ( defined $mode ) {
		$mode = oct($mode) & 0777;
		$mode = 0666 unless $mode; # sanity
	    }
	    set_utime ($fn, $mtime, $mode);
	    next if $retain;
	    $fn .= $suffix;
	    if ( -f $fn ) {
		do_unlink ($fn);
	    }
	}
	elsif ( $op eq 'r' ) {
	    print STDERR ("+ unlink $fn\n") if $trace;
	    # Be forgiving, maybe patch already removed the file.
	    if ( -e $fn ) {
		do_unlink ($fn);
	    }
	    else {
		warn ("Apparently, $fn has been removed already.\n");
	    }
	}
	elsif ( $op eq 'R' ) {
	    print STDERR ("+ rmdir $fn\n") if $trace;
	    # Maybe some future version of patch will take care of directories.
	    if ( -e $fn ) {
		do_rmdir ($fn);
	    }
	    else {
		warn ("Apparently, $fn has been removed already.\n");
	    }
	}
    }

}

################ Options and Help ################

sub app_options () {
    my $help = 0;		# handled locally

    # Process options, if any.
    # Make sure defaults are set before returning!
    return unless @ARGV > 0;
    my @opts = ('check'		=> \$check,
		'dir|d=s'	=> \$dir,
		'retain'	=> \$retain,
		'force'		=> \$force,
		'verbose'	=> \$verbose,
		'quiet'		=> sub { $verbose = 0; },
		'patch=s'	=> \$patch,
		'test'		=> \$test,
		'trace'		=> \$trace,
		'debug'		=> \$debug,
		'help'		=> \$help);
    
    (!GetOptions (@opts) || $help) && app_usage (2);

}

sub app_usage ($) {
    my ($exit) = @_;
    print STDERR <<EndOfUsage;
Usage: $0 [options] patch-kit

    -help		this message
    -dir XXX		change to this directory before executing
    -check              check, but does not execute
    -retain		retain .orig file after patching
    -force              continue after verification failures
    -patch XXX		the patch command, default "$patch"
    -quiet		no information
    -verbose		verbose information
EndOfUsage
    exit $exit if defined $exit && $exit != 0;
}

1;

__END__

################ Documentation ################

=head1 NAME

applypatch - apply 'makepatch' generated script to update a source tree

=head1 SYNOPSIS

B<applypatch> [ I<options> ] I<patch-kit>

=head1 DESCRIPTION

B<Applypatch> applies a patch kit as generated by the B<makepatch>
program. It performs the following actions:

=over 4

=item *

First, it will extensively verify that the patch kit is complete and
did not get corrupted during transfer.

=item *

Then it will apply some heuristics to verify that the directory in
which the patch will be applied does indeed contain the expected
sources.

If a corruption or verification error is detected, B<applypatch> exits
without making changes.

=item *