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|
#! /usr/bin/perl
BEGIN { # Work-around for bug #479711 in perl
$ENV{PERL_DL_NONLAZY} = 1;
}
use strict;
use warnings;
use POSIX;
use POSIX qw(:errno_h :signal_h);
use Dpkg;
use Dpkg::Gettext;
textdomain("dpkg");
my $verbose = 1;
my $doforce = 0;
my $doupdate = 0;
my $mode = "";
my %owner;
my %group;
my %mode;
sub version {
printf _g("Debian %s version %s.\n"), $progname, $version;
printf _g("
Copyright (C) 2000 Wichert Akkerman.");
printf _g("
This is free software; see the GNU General Public Licence version 2 or
later for copying conditions. There is NO warranty.
");
}
sub usage {
printf _g(
"Usage: %s [<option> ...] <command>
Commands:
--add <owner> <group> <mode> <file>
add a new entry into the database.
--remove <file> remove file from the database.
--list [<glob-pattern>] list current overrides in the database.
Options:
--admindir <directory> set the directory with the statoverride file.
--update immediately update file permissions.
--force force an action even if a sanity check fails.
--quiet quiet operation, minimal output.
--help show this help message.
--version show the version.
"), $progname;
}
sub CheckModeConflict {
return unless $mode;
badusage(sprintf(_g("two commands specified: %s and --%s"), $_, $mode));
}
while (@ARGV) {
$_=shift(@ARGV);
last if m/^--$/;
if (!m/^-/) {
unshift(@ARGV,$_); last;
} elsif (m/^--help$/) {
usage();
exit(0);
} elsif (m/^--version$/) {
version();
exit(0);
} elsif (m/^--update$/) {
$doupdate=1;
} elsif (m/^--quiet$/) {
$verbose=0;
} elsif (m/^--force$/) {
$doforce=1;
} elsif (m/^--admindir$/) {
@ARGV || badusage(sprintf(_g("--%s needs a <directory> argument"), "admindir"));
$admindir= shift(@ARGV);
} elsif (m/^--add$/) {
CheckModeConflict();
$mode= 'add';
} elsif (m/^--remove$/) {
CheckModeConflict();
$mode= 'remove';
} elsif (m/^--list$/) {
CheckModeConflict();
$mode= 'list';
} else {
badusage(sprintf(_g("unknown option \`%s'"), $_));
}
}
my $dowrite = 0;
my $exitcode = 0;
badusage(_g("no mode specified")) unless $mode;
ReadOverrides();
if ($mode eq "add") {
@ARGV == 4 || badusage(_g("--add needs four arguments"));
my $user = $ARGV[0];
my $uid = 0;
my $gid = 0;
if ($user =~ m/^#([0-9]+)$/) {
$uid=$1;
badusage(sprintf(_g("illegal user %s"), $user)) if ($uid < 0);
} else {
my ($name, $pw);
(($name, $pw, $uid) = getpwnam($user)) ||
badusage(sprintf(_g("non-existing user %s"), $user));
}
my $group = $ARGV[1];
if ($group =~ m/^#([0-9]+)$/) {
$gid=$1;
badusage(sprintf(_g("illegal group %s"), $group)) if ($gid < 0);
} else {
my ($name, $pw);
(($name, $pw, $gid) = getgrnam($group)) ||
badusage(sprintf(_g("non-existing group %s"), $group));
}
my $mode = $ARGV[2];
(($mode < 0) or (oct($mode) > 07777) or ($mode !~ m/\d+/)) &&
badusage(sprintf(_g("illegal mode %s"), $mode));
my $file = $ARGV[3];
$file =~ m/\n/ && badusage(_g("file may not contain newlines"));
$file =~ s,/+$,, && print STDERR _g("stripping trailing /")."\n";
if (defined $owner{$file}) {
printf STDERR _g("An override for \"%s\" already exists, "), $file;
if ($doforce) {
print STDERR _g("but --force specified so will be ignored.")."\n";
} else {
print STDERR _g("aborting")."\n";
exit(3);
}
}
$owner{$file}=$user;
$group{$file}=$group;
$mode{$file}=$mode;
$dowrite=1;
if ($doupdate) {
if (not -e $file) {
printf STDERR _g("warning: --update given but %s does not exist")."\n", $file;
} else {
chown ($uid,$gid,$file) || warn sprintf(_g("failed to chown %s: %s"), $file, $!)."\n";
chmod (oct($mode),$file) || warn sprintf(_g("failed to chmod %s: %s"), $file, $!)."\n";
}
}
} elsif ($mode eq "remove") {
@ARGV == 1 || badusage(sprintf(_g("--%s needs a single argument"), "remove"));
my $file = $ARGV[0];
$file =~ s,/+$,, && print STDERR _g("stripping trailing /")."\n";
if (not defined $owner{$file}) {
print STDERR _g("No override present.")."\n";
exit(0) if ($doforce);
exit(2);
}
delete $owner{$file};
delete $group{$file};
delete $mode{$file};
$dowrite=1;
print(STDERR _g("warning: --update is useless for --remove")."\n") if ($doupdate);
} elsif ($mode eq "list") {
my (@list, @ilist);
@ilist= @ARGV ? @ARGV : ('*');
while (defined($_=shift(@ilist))) {
s/\W/\\$&/g;
s/\\\?/./g;
s/\\\*/.*/g;
s,/+$,, && print STDERR _g("stripping trailing /")."\n";
push(@list,"^$_\$");
}
my $pattern = join('|', @list);
$exitcode=1;
for my $file (keys %owner) {
next unless ($file =~ m/$pattern/o);
$exitcode=0;
print "$owner{$file} $group{$file} $mode{$file} $file\n";
}
}
WriteOverrides() if ($dowrite);
exit($exitcode);
sub ReadOverrides {
open(SO, "$admindir/statoverride") ||
quit(sprintf(_g("cannot open statoverride: %s"), $!));
while (<SO>) {
my ($owner,$group,$mode,$file);
chomp;
($owner,$group,$mode,$file)=split(' ', $_, 4);
die sprintf(_g("Multiple overrides for \"%s\", aborting"), $file)
if defined $owner{$file};
$owner{$file}=$owner;
$group{$file}=$group;
$mode{$file}=$mode;
}
close(SO);
}
sub WriteOverrides {
my ($file);
open(SO, ">$admindir/statoverride-new") ||
quit(sprintf(_g("cannot open new statoverride file: %s"), $!));
foreach $file (keys %owner) {
print SO "$owner{$file} $group{$file} $mode{$file} $file\n";
}
close(SO);
chmod(0644, "$admindir/statoverride-new");
unlink("$admindir/statoverride-old") ||
$! == ENOENT || quit(sprintf(_g("error removing statoverride-old: %s"), $!));
link("$admindir/statoverride","$admindir/statoverride-old") ||
$! == ENOENT || quit(sprintf(_g("error creating new statoverride-old: %s"), $!));
rename("$admindir/statoverride-new","$admindir/statoverride")
|| quit(sprintf(_g("error installing new statoverride: %s"), $!));
}
sub quit
{
printf STDERR "%s: %s\n", $0, "@_";
exit(2);
}
sub badusage
{
printf STDERR "%s: %s\n\n", $0, "@_";
usage();
exit(2);
}
# vi: ts=8 sw=8 ai si cindent
|
