File: sysconftool

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#!/usr/bin/perl
# Copyright 2000 Double Precision, Inc.  See COPYING for
# distribution information.
 
use IO::File;
use Getopt::Long;

my $exitcode=0;

my $ver;
my $noclobber;
my $force;
my $require;

my $myversion="0.17";

exit 1 unless GetOptions("v" => \$ver, "n" => \$noclobber,
			 "f" => \$force, "r=s" => \$require);

print "$myversion\n" if $ver;

die "$0: Version not supported.\n"
    if $require && versioncmp($myversion, $require) < 0;

while ($#ARGV >= 0)
{
    my $filename=shift @ARGV;

    $filename =~ s/\.dist$//;

    my $rc;

    eval {
	$rc=sysconftool($filename, $noclobber, $force);
    } ;

    if ($@)
    {
	$rc=9;

	$@ .= "\n" unless $@ =~ /\n/s;
	print "$@";
    }

    $exitcode=$rc if $rc > $exitcode;
}

exit ($exitcode);

sub sysconftool {
    my $filename=shift;
    my $noclobber=shift;
    my $force=shift;

    my $distfile=new IO::File;

    die "$filename.dist: $!\n" if ! $distfile->open("< $filename.dist");

    my ($distheader, $distver);

    ($distheader, $distver)= sysconftool_readver($distfile);

    die "$filename.dist: configuration header not found.\n" unless $distver;

    my $oldfile=new IO::File;

    if ( ! $oldfile->open($filename))
    {
	$oldfile=undef;
    }
    else
    {
	my ($dummy, $configver);

	($dummy, $configver)= sysconftool_readver($oldfile);

	if (! defined $dummy)
	{
	    $oldfile=undef; # Legacy config file
	}
	elsif ($configver eq $distver)
	{
	    return 0 unless $force;
	}
    }

    my %old_settings;
    my %old_version;

    # If there's an old file, read old settings.

    if (defined $oldfile)
    {
	my $configname="";
	my $configversion="";
	my $line;
	my $resetflag=0;

	while (defined ($line=<$oldfile>))
	{
	    if ($line =~ /^\#/)
	    {
		$configname=$configversion="" if $resetflag;
		$resetflag=0;

		if ($line =~ /^\#\#NAME:(.*):(.*)/)
		{
		    ($configname, $configversion)=($1, $2);
		    
		    $configname =~ s/[ \t]//g;
		    $configversion =~ s/[ \t]//g;

		    $old_version{$configname}=$configversion;
		}
	    }
	    else
	    {
		$resetflag=1;
		$old_settings{$configname} .= $line
		    if $configname;
	    }
	}
	$oldfile=undef;
    }

    my $newfile=new IO::File;

    die "$filename.new: $!\n"
	if ! $newfile->open($noclobber ? ">/dev/null":">$filename.new");

    eval {
	{
	    my $f=$filename;

	    $f =~ s:^.*/([^/]*)$:$1:;

	    print $f . ":\n";
	}

	# Try to carry over ownership and perms

	my @inode=stat($distfile);

	die $! unless $#inode > 0;

	if (! $noclobber)
	{
	    chown $inode[4], $inode[5], "$filename.new";
	    chmod $inode[2], "$filename.new";
	}

	(print $newfile $distheader) || die $!;

	sysconftool_writeout($newfile, $distfile, \%old_settings,
			     \%old_version, "$filename.dist");
    } ;

    if ($@)
    {
	$newfile=undef;
	unlink "$filename.new";
	die "$filename.new: $@";
    }

    $newfile=undef;

    rename "$filename", "$filename.bak" unless $noclobber;
    rename "$filename.new", "$filename" unless $noclobber;
    return 0;
}

# Read the version header from the file.

sub sysconftool_readver {
    my $fh=shift;

    my $header;
    my $cnt;

    for (;;)
    {
	my $line=<$fh>;

	last if ! defined $line || ++$cnt > 20;

	$header .= $line;

	return ($header, $line) if $line =~ /^\#\#VERSION:/;
    }

    return undef;
}

#
# Read the dist file, write out the config file, and try to piece it back
# from the old config file.

sub sysconftool_writeout {
    my $newfile=shift;
    my $oldfile=shift;
    my $old_settings=shift;
    my $old_version=shift;
    my $filename=shift;

    my $line;

    my $prefix_comment=0;
    my $old_setting="";

    my $last_setting=undef;
    my $prev_setting=undef;

    while (defined($line=<$oldfile>))
    {
	if (! ($line =~ /^\#/))
	{
	    if ($prev_setting)
	    {
		# Before the first line of a new configuration setting
		# print the obsoleted config setting (commented out).

		(print $newfile $prev_setting) || die $!;
		$prev_setting=undef;
	    }
	    if ($prefix_comment > 0)
	    {
		# Keeping old config setting, comment out the new dist
		# setting.

		if ($prefix_comment < 2)
		{
		    $prefix_comment=2;
		    (print $newfile "#\n# DEFAULT SETTING from $filename:\n") || die $!;
		}
		$line = "#$line";
	    }
	}
	elsif ($line =~ /^\#\#NAME:(.*):(.*)/)
	{
	    ($configname, $configversion)=($1, $2);

	    $configname =~ s/[ \t]//g;
	    $configversion =~ s/[ \t]//g;

	    $prefix_comment=0;

	    if (defined $last_setting)
	    {
		# Write out old config setting before we go to the next
		# setting in the dist file.

		(print $newfile $last_setting) || die $!;
		$last_setting=undef;
	    }

	    if ( defined $$old_settings{$configname})
	    {
		if ($$old_version{$configname} eq $configversion)
		{
		    # Setting didn't change in the dist file, keep
		    # current settings.

		    print "  $configname: unchanged\n";
		    $prefix_comment=1;
		    $last_setting=$$old_settings{$configname};
		}
		else
		{
		    # Must install updated setting.  Carefully comment
		    # out the current setting.

		    print "  $configname: UPDATED\n";

		    my @lines=
			split (/\n/s,"$$old_settings{$configname}\n");

		    push @lines, "" if $#lines < 0;

		    grep (s/^/\# /, @lines);

		    $prev_setting= "#\n# Previous setting (inserted by sysconftool):\n#\n" .
			join("\n", @lines) . "\n#\n";
		}
	    }
	    else
	    {
		print "  $configname: new\n";
	    }
	}

	(print $newfile $line) || die $!;
    }

    # Write out any pending settings.

    if (defined $last_setting)
    {
	(print $newfile $last_setting) || die $!;
	$last_setting=undef;
    }

    if ($prev_setting)
    {
	(print $newfile $prev_setting) || die $!;
    }
}

#######

# Not everyone has Sort::Version, so we roll our own here.  It's not that bad.

sub versioncmp {
    my @a=split (/\./, shift);
    my @b=split (/\./, shift);

    for (;;)
    {
	my $a=shift @a;
	my $b=shift @b;

	last if (! defined $a) && (! defined $b);

	return -1 if ! defined $a;
	return 1 if ! defined $b;

	my @ap=versionsplitclass($a);
	my @bp=versionsplitclass($b);

	for (;;)
	{
	    my $a=shift @ap;
	    my $b=shift @bp;

	    last if (! defined $a) && (! defined $b);

	    return -1 if ! defined $a;
	    return 1 if ! defined $b;

	    my $n;

	    if ( $a =~ /[0-9]/)
	    {
		$n= $a <=> $b;
	    }
	    else
	    {
		$n= $a cmp $b;
	    }

	    return $n if $n;
	}
    }
    return 0;
}

sub versionsplitclass {
    my $v=shift;
    my @a;

    while ( $v ne "")
    {
	if ($v =~ /^([0-9]+)(.*)/)
	{
	    push @a, $1;
	    $v=$2;
	}
	else
	{
	    die unless $v =~ /^([^0-9]+)(.*)/;
	    push @a, $1;
	    $v=$2;
	}
    }
    return @a;
}