# ex:ts=8 sw=4:
# $OpenBSD: Delete.pm,v 1.105 2010/06/30 10:51:04 espie Exp $
#
# Copyright (c) 2003-2007 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

use strict;
use warnings;

package OpenBSD::Delete;
use OpenBSD::Error;
use OpenBSD::PackageInfo;
use OpenBSD::RequiredBy;
use OpenBSD::Paths;
use File::Basename;

sub keep_old_files
{
	my ($state, $plist) = @_;
	my $p = new OpenBSD::PackingList;
	my $borked = borked_package($plist->pkgname);
	$p->set_infodir(installed_info($borked));
	mkdir($p->infodir);

	$plist->copy_old_stuff($p, $state);
	$p->set_pkgname($borked);
	$p->to_installation;
	return $borked;
}

sub manpages_unindex
{
	my ($state) = @_;
	return unless defined $state->{mandirs};
	my $destdir = $state->{destdir};
	require OpenBSD::Makewhatis;

	while (my ($k, $v) = each %{$state->{mandirs}}) {
		my @l = map { $destdir.$_ } @$v;
		if ($state->{not}) {
			$state->say("Removing manpages in #1: #2",
			    $destdir.$k, join(@l)) if $state->verbose >= 2;
		} else {
			eval { OpenBSD::Makewhatis::remove($destdir.$k, \@l); };
			if ($@) {
				$state->errsay("Error in makewhatis: #1", $@);
			}
		}
	}
	undef $state->{mandirs};
}

sub validate_plist
{
	my ($plist, $state) = @_;

	if ($plist->has('system-package')) {
		$state->{problems}++;
		$state->errsay("Error: can't delete system packages");
		return;
	}
	$plist->prepare_for_deletion($state, $plist->pkgname);
}

sub remove_packing_info
{
	my ($plist, $state) = @_;

	my $dir = $plist->infodir;

	for my $fname (info_names()) {
		unlink($dir.$fname);
	}
	OpenBSD::RequiredBy->forget($dir);
	OpenBSD::Requiring->forget($dir);
	rmdir($dir) or
	    $state->fatal("can't finish removing directory #1: #2", $dir, $!);
}

sub delete_package
{
	my ($pkgname, $state) = @_;
	$state->progress->message("reading plist");
	my $plist = OpenBSD::PackingList->from_installation($pkgname) or
	    $state->fatal("bad package #1", $pkgname);
	if (!defined $plist->pkgname) {
		$state->fatal("package #1 is missing a \@name in plist",
		    $pkgname);
	}
	if ($plist->pkgname ne $pkgname) {
		$state->fatal("Package real name #1 does not match #2",
			$plist->pkgname, $pkgname);
	}
	if ($plist->is_signed) {
		if (!$state->{quick}) {
			require OpenBSD::x509;
			if (!OpenBSD::x509::check_signature($plist, $state)) {
				$state->fatal("package #1 was corrupted: signature check failed", $pkgname);
			}
		}
	}

	$state->{problems} = 0;
	validate_plist($plist, $state);
	$state->fatal("can't recover from deinstalling #1", $pkgname)
	    if $state->{problems};
	$state->vstat->synchronize;

	delete_plist($plist, $state);
	$state->{done}++;
	$state->progress->next($state->ntogo);
}

sub unregister_dependencies
{
	my ($plist, $state) = @_;

	my $pkgname = $plist->pkgname;
	my $l = OpenBSD::Requiring->new($pkgname);

	for my $name ($l->list) {
		$state->say("remove dependency on #1", $name)
		    if $state->verbose >= 3;
		local $@;
		try {
			OpenBSD::RequiredBy->new($name)->delete($pkgname);
		} catchall {
			$state->errsay($_);
		};
	}
	$l->erase;
}

sub delete_plist
{
	my ($plist, $state) = @_;

	my $pkgname = $plist->pkgname;
	$state->{pkgname} = $pkgname;
	$ENV{'PKG_PREFIX'} = $plist->localbase;
	if (!$state->{size_only}) {
		$plist->register_manpage($state);
		manpages_unindex($state);
		$state->progress->visit_with_size($plist, 'delete', $state);
		if ($plist->has(UNDISPLAY)) {
			$plist->get(UNDISPLAY)->prepare($state);
		}
	}

	unregister_dependencies($plist, $state);
	return if $state->{not};
	if ($state->{baddelete}) {
	    my $borked = keep_old_files($state, $plist);
	    $state->log("Files kept as #1 package", $borked);
	    delete $state->{baddelete};
	}


	remove_packing_info($plist, $state);
	delete_installed($pkgname);
}

package OpenBSD::PackingElement;

sub rename_file_to_temp
{
	my $self = shift;
	require OpenBSD::Temp;

	my $n = $self->fullname;

	my ($fh, $j) = OpenBSD::Temp::permanent_file(undef, $n);
	close $fh;
	if (rename($n, $j)) {
		print "Renaming old file $n to $j\n";
		if ($self->name !~ m/^\//o && $self->cwd ne '.') {
			my $c = $self->cwd;
			$j =~ s|^\Q$c\E/||;
		}
		$self->set_name($j);
	} else {
		print "Bad rename $n to $j: $!\n";
	}
}

sub prepare_for_deletion
{
}

sub delete
{
}

sub record_shared
{
}

sub copy_old_stuff
{
}

package OpenBSD::PackingElement::Cwd;

sub copy_old_stuff
{
	my ($self, $plist, $state) = @_;
	$self->add_object($plist);
}

package OpenBSD::PackingElement::FileObject;
use File::Basename;

sub mark_directory
{
	my ($self, $state, $dir) = @_;

	$state->{dirs_okay}->{$dir} = 1;
	my $d2 = dirname($dir);
	if ($d2 ne $dir) {
		$self->mark_directory($state, $d2);
	}
}

sub mark_dir
{
	my ($self, $state) = @_;

	$self->mark_directory($state, dirname($self->fullname));
}

sub do_not_delete
{
	my ($self, $state) = @_;

	my $realname = $self->realname($state);
	$state->{baddelete} = 1;
	$self->{stillaround} = 1;

	delete $self->{symlink};
	delete $self->{link};
	my $algo = $self->{d};
	delete $self->{d};

	if (-l $realname) {
		$self->{symlink} = readlink $realname;
	} elsif (-f _) {
		$self->{d} = $self->compute_digest($realname, $algo);
	} elsif (-d _) {
		# what should we do ?
	}
}


package OpenBSD::PackingElement::DirlikeObject;
sub mark_dir
{
	my ($self, $state) = @_;
	$self->mark_directory($state, $self->fullname);
}

package OpenBSD::PackingElement::NewUser;
sub delete
{
	my ($self, $state) = @_;

	if ($state->verbose >= 2) {
		$state->say("rmuser: #1", $self->name);
	}

	$self->record_shared($state->{recorder}, $state->{pkgname});
}

sub record_shared
{
	my ($self, $recorder, $pkgname) = @_;
	$recorder->{users}->{$self->name} = $pkgname;
}

package OpenBSD::PackingElement::NewGroup;
sub delete
{
	my ($self, $state) = @_;

	if ($state->verbose >= 2) {
		$state->say("rmgroup: #1", $self->name);
	}

	$self->record_shared($state->{recorder}, $state->{pkgname});
}

sub record_shared
{
	my ($self, $recorder, $pkgname) = @_;
	$recorder->{groups}->{$self->name} = $pkgname;
}

package OpenBSD::PackingElement::DirBase;
sub prepare_for_deletion
{
	my ($self, $state, $pkgname) = @_;
	return unless $self->{noshadow};
	$state->{noshadow}->{$state->{destdir}.$self->fullname} = 1;
}

sub delete
{
	my ($self, $state) = @_;

	if ($state->verbose >= 5) {
		$state->say("rmdir: #1", $self->fullname);
	}

	$self->record_shared($state->{recorder}, $state->{pkgname});
}

sub record_shared
{
	my ($self, $recorder, $pkgname) = @_;
	$self->{pkgname} = $pkgname;
	push(@{$recorder->{dirs}->{$self->fullname}} , $self);
}

package OpenBSD::PackingElement::Unexec;
sub delete
{
	my ($self, $state) = @_;
	if ($self->should_run($state)) {
		$self->run($state);
	}
}

sub should_run() { 1 }

package OpenBSD::PackingElement::UnexecDelete;
sub should_run
{
	my ($self, $state) = @_;
	return !$state->{replacing};
}

package OpenBSD::PackingElement::UnexecUpdate;
sub should_run
{
	my ($self, $state) = @_;
	return $state->{replacing};
}

package OpenBSD::PackingElement::FileBase;
use OpenBSD::Error;

sub prepare_for_deletion
{
	my ($self, $state, $pkgname) = @_;

	my $fname = $state->{destdir}.$self->fullname;
	my $s;
	if ($state->{delete_first}) {
		$s = $state->vstat->remove_first($fname, $self->{size});
	} else {
		$s = $state->vstat->remove($fname, $self->{size});
	}
	return unless defined $s;
	if ($s->ro) {
		$s->report_ro($state, $fname);
	}
}

sub delete
{
	my ($self, $state) = @_;
	my $realname = $self->realname($state);

	if (defined $self->{symlink}) {
		if (-l $realname) {
			my $contents = readlink $realname;
			if ($contents ne $self->{symlink}) {
				$state->say("Symlink does not match: #1 (#2 vs. #3)",
				    $realname, $contents, $self->{symlink});
				$self->do_not_delete($state);
				return;
			}
		} else  {
			$state->say("Bogus symlink: #1", $realname);
			$self->do_not_delete($state);
			return;
		}
	} else {
		if (-l $realname) {
				$state->say("Unexpected symlink: #1", $realname);
				$self->do_not_delete($state);
		} else {
			if (! -f $realname) {
				$state->say("File #1 does not exist", $realname);
				return;
			}
			unless (defined($self->{link}) or $self->{nochecksum} or $state->{quick}) {
				if (!defined $self->{d}) {
					$state->say("Problem: #1 does not have a checksum\n".
					    "NOT deleting: #2",
					    $self->fullname, $realname);
					$state->log("Couldn't delete #1 (no checksum)", $realname);
					return;
				}
				my $d = $self->compute_digest($realname,
				    $self->{d});
				if (!$d->equals($self->{d})) {
					$state->say("Problem: checksum doesn't match for #1\n".
					    "NOT deleting: #2",
					    $self->fullname, $realname);
					$state->log("Couldn't delete #1 (bad checksum)", $realname);
					$self->do_not_delete($state);
					return;
				}
			}
		}
	}
	if ($state->verbose >= 5) {
		$state->say("deleting: #1", $realname);
	}
	return if $state->{not};
	if (!unlink $realname) {
		$state->errsay("Problem deleting #1: #2", $realname, $!);
		$state->log("deleting #1 failed: #2", $realname, $!);
	}
}

sub copy_old_stuff
{
	my ($self, $plist, $state) = @_;

	if (defined $self->{stillaround}) {
		delete $self->{stillaround};
		if ($state->{replacing}) {
			$self->rename_file_to_temp;
		}
		$self->add_object($plist);
	}
}

package OpenBSD::PackingElement::SpecialFile;
use OpenBSD::PackageInfo;

sub prepare_for_deletion
{
	my ($self, $state, $pkgname) = @_;

	my $fname = $self->fullname;
	my $size = $self->{size};
	if (!defined $size) {
		$size = (stat $fname)[7];
	}
	my $s = $state->vstat->remove($fname, $self->{size});
	return unless defined $s;
	if ($s->ro) {
		$s->report_ro($state, $fname);
	}
	if ($s->noexec && $self->exec_on_delete) {
		$s->report_noexec($state, $fname);
	}
}

sub copy_old_stuff
{
}

package OpenBSD::PackingElement::Meta;
sub copy_old_stuff
{
	my ($self, $plist, $state) = @_;
	$self->add_object($plist);
}

package OpenBSD::PackingElement::DigitalSignature;
sub copy_old_stuff
{
}

package OpenBSD::PackingElement::FDESC;
sub copy_old_stuff
{
	my ($self, $plist, $state) = @_;
	require File::Copy;

	File::Copy::copy($self->fullname, $plist->infodir);
	$self->add_object($plist);
}

package OpenBSD::PackingElement::Sample;
use OpenBSD::Error;
use File::Basename;

sub delete
{
	my ($self, $state) = @_;
	my $realname = $self->realname($state);

	my $orig = $self->{copyfrom};
	if (!defined $orig) {
		$state->fatal("\@sample element does not reference a valid file");
	}
	my $action = $state->{replacing} ? "check" : "remove";
	my $origname = $orig->realname($state);
	if (! -e $realname) {
		$state->log("File #1 does not exist", $realname);
		return;
	}
	if (! -f $realname) {
		$state->log("File #1 is not a file", $realname);
		return;
	}

	if (!defined $orig->{d}) {
		$state->log("Couldn't delete #1 (no checksum)", $realname);
		return;
	}

	if ($state->{quick} && $state->{quick} >= 2) {
		unless ($state->{extra}) {
			$self->mark_dir($state);
			$state->log("You should also #1 #2", $action, $realname );
			return;
		}
	} else {
		my $d = $self->compute_digest($realname, $orig->{d});
		if ($d->equals($orig->{d})) {
			$state->say("File #1 identical to sample", $realname) if $state->verbose >= 2;
		} else {
			unless ($state->{extra}) {
				$self->mark_dir($state);
				$state->log("You should also #1 #2 (which was modified)", $action, $realname);
				return;
			}
		}
	}
	$state->say("deleting #1", $realname) if $state->verbose >= 2;
	return if $state->{not};
	if (!unlink $realname) {
		$state->errsay("Problem deleting #1: #2", $realname, $!);
		$state->log("deleting #1 failed: #2", $realname, $!);
	}
}


package OpenBSD::PackingElement::InfoFile;
use File::Basename;
use OpenBSD::Error;
sub delete
{
	my ($self, $state) = @_;
	unless ($state->{not}) {
	    my $fullname = $state->{destdir}.$self->fullname;
	    $state->vsystem(OpenBSD::Paths->install_info,
		"--delete", "--info-dir=".dirname($fullname), '--', $fullname);
	}
	$self->SUPER::delete($state);
}

package OpenBSD::PackingElement::Shell;
sub delete
{
	my ($self, $state) = @_;
	unless ($state->{not}) {
		my $destdir = $state->{destdir};
		my $fullname = $self->fullname;
		my @l=();
		if (open(my $shells, '<', $destdir.OpenBSD::Paths->shells)) {
			my $_;
			while(<$shells>) {
				push(@l, $_);
				s/^\#.*//o;
				if ($_ =~ m/^\Q$fullname\E\s*$/) {
					pop(@l);
				}
			}
			close($shells);
			open(my $shells2, '>', $destdir.OpenBSD::Paths->shells);
			print $shells2 @l;
			close $shells2;
			$state->say("Shell #1 removed from #2",
			    $fullname, $destdir.OpenBSD::Paths->shells)
			    	if $state->verbose;
		}
	}
	$self->SUPER::delete($state);
}

package OpenBSD::PackingElement::Extra;
use File::Basename;

sub delete
{
	my ($self, $state) = @_;
	my $realname = $self->realname($state);
	if ($state->verbose >= 2 && $state->{extra}) {
		$state->say("deleting extra file: #1", $realname);
	}
	return if $state->{not};
	return unless -e $realname or -l $realname;
	if ($state->{replacing}) {
		$state->log("Remember to update #1", $realname);
		$self->mark_dir($state);
	} elsif ($state->{extra}) {
		unlink($realname) or
		    $state->say("problem deleting extra file #1: #2", $realname, $!);
	} else {
		$state->log("You should also remove #1", $realname);
		$self->mark_dir($state);
	}
}


package OpenBSD::PackingElement::Extradir;
sub delete
{
	my ($self, $state) = @_;
	return unless $state->{extra};
	my $realname = $self->realname($state);
	return if $state->{replacing};
	if ($state->{extra}) {
		$self->SUPER::delete($state);
	} else {
		$state->log("You should also remove the directory #1", $realname);
		$self->mark_dir($state);
	}
}

package OpenBSD::PackingElement::ExtraUnexec;

sub delete
{
	my ($self, $state) = @_;
	if ($state->{extra}) {
		$self->run($state);
	} else {
		$state->log("You should also run #1", $self->{expanded});
	}
}

package OpenBSD::PackingElement::Lib;
sub delete
{
	my ($self, $state) = @_;
	$self->SUPER::delete($state);
	$self->mark_ldconfig_directory($state->{destdir});
}

package OpenBSD::PackingElement::FDEINSTALL;
sub delete
{
	my ($self, $state) = @_;

	$self->run($state, "DEINSTALL");
}

package OpenBSD::PackingElement::Depend;
sub copy_old_stuff
{
	my ($self, $plist, $state) = @_;

	OpenBSD::PackingElement::Comment->add($plist, "\@".$self->keyword." ".$self->stringize);
}

1;