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|
#! /usr/bin/perl
use POSIX;
use POSIX qw(:errno_h :signal_h);
$admindir= "/var/lib/dpkg"; # This line modified by Makefile
$version= '1.3.0'; # This line modified by Makefile
$verbose= 1;
$doforce= 0;
$doupdate= 0;
$mode= "";
sub UsageVersion {
print STDERR <<EOF || &quit("failed to write usage: $!");
Debian dpkg-statoverride $version.
Copyright (C) 2000 Wichert Akkerman.
This is free software; see the GNU General Public Licence version 2 or later
for copying conditions. There is NO warranty.
Usage:
dpkg-statoverride [options] --add <owner> <group> <mode> <file>
dpkg-statoverride [options] --remove <file>
dpkg-statoverride [options] --list [<glob-pattern>]
Options:
--update immediately update file permissions
--force force an action even if a sanity check fails
--quiet quiet operation, minimal output
--help print this help screen and exit
--admindir <directory> set the directory with the statoverride file
EOF
}
sub CheckModeConflict {
return unless $mode;
&badusage("two modes specified: $_ and --$mode");
}
while (@ARGV) {
$_=shift(@ARGV);
last if m/^--$/;
if (!m/^-/) {
unshift(@ARGV,$_); last;
} elsif (m/^--help$/) {
&UsageVersion; exit(0);
} elsif (m/^--update$/) {
$doupdate=1;
} elsif (m/^--quiet$/) {
$verbose=0;
} elsif (m/^--force$/) {
$doforce=1;
} elsif (m/^--admindir$/) {
@ARGV || &badusage("--admindir needs a directory argument");
$admindir= shift(@ARGV);
} elsif (m/^--add$/) {
&CheckModeConflict;
$mode= 'add';
} elsif (m/^--remove$/) {
&CheckModeConflict;
$mode= 'remove';
} elsif (m/^--list$/) {
&CheckModeConflict;
$mode= 'list';
} else {
&badusage("unknown option \`$_'");
}
}
$dowrite=0;
$exitcode=0;
&badusage("no mode specified") unless $mode;
&ReadOverrides;
if ($mode eq "add") {
@ARGV==4 || &badusage("--add needs four arguments");
$user=$ARGV[0];
if ($user =~ m/^#([0-9]+)$/) {
$uid=$1;
&badusage("illegal user $user") if ($uid<0);
} else {
(($name,$pw,$uid)=getpwnam($user)) || &badusage("non-existing user $user");
}
$group=$ARGV[1];
if ($group =~ m/^#([0-9]+)$/) {
$gid=$1;
&badusage("illegal group $group") if ($gid<0);
} else {
(($name,$pw,$gid)=getgrnam($group)) || &badusage("non-existing group $group");
}
$mode= $ARGV[2];
(($mode<0) or (oct($mode)>07777) or ($mode !~ m/\d+/)) && &badusage("illegal mode $mode");
$file= $ARGV[3];
$file =~ m/\n/ && &badusage("file may not contain newlines");
$file =~ s,/+$,, && print STDERR "stripping trailing /\n";
if (defined $owner{$file}) {
print STDERR "An override for \"$file\" already exists, ";
if ($doforce) {
print STDERR "but --force specified so lets ignore it.\n";
} else {
print STDERR "aborting\n";
exit(3);
}
}
$owner{$file}=$user;
$group{$file}=$group;
$mode{$file}=$mode;
$dowrite=1;
if ($doupdate) {
if (not -e $file) {
print STDERR "warning: --update given but $file does not exist\n";
} else {
chown ($uid,$gid,$file) || warn "failed to chown $file: $!\n";
chmod (oct($mode),$file) || warn "failed to chmod $file: $!\n";
}
}
} elsif ($mode eq "remove") {
@ARGV==1 || &badusage("--remove needs one arguments");
$file=$ARGV[0];
$file =~ s,/+$,, && print STDERR "stripping trailing /\n";
if (not defined $owner{$file}) {
print STDERR "No override present.\n";
exit(0) if ($doforce);
exit(2);
}
delete $owner{$file};
delete $group{$file};
delete $mode{$file};
$dowrite=1;
print STDERR "warning: --update is useless for --remove\n" if ($doupdate);
} elsif ($mode eq "list") {
my (@list,@ilist,$pattern,$file);
@ilist= @ARGV ? @ARGV : ('*');
while (defined($_=shift(@ilist))) {
s/\W/\\$&/g;
s/\\\?/./g;
s/\\\*/.*/g;
s,/+$,, && print STDERR "stripping trailing /\n";
push(@list,"^$_\$");
}
$pat= join('|',@list);
$exitcode=1;
for $file (keys %owner) {
next unless ($file =~ m/$pat/o);
$exitcode=0;
print "$owner{$file} $group{$file} $mode{$file} $file\n";
}
}
&WriteOverrides if ($dowrite);
exit($exitcode);
sub ReadOverrides {
open(SO,"$admindir/statoverride") || &quit("cannot open statoverride: $!");
while (<SO>) {
my ($owner,$group,$mode,$file);
chomp;
($owner,$group,$mode,$file)=split(' ', $_, 4);
die "Multiple overrides for \"$file\", aborting"
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("cannot open new statoverride file: $!");
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("error removing statoverride-old: $!");
link("$admindir/statoverride","$admindir/statoverride-old") ||
$! == ENOENT || &quit("error creating new statoverride-old: $!");
rename("$admindir/statoverride-new","$admindir/statoverride")
|| &quit("error installing new statoverride: $!");
}
sub quit { print STDERR "dpkg-statoverride: @_\n"; exit(2); }
sub badusage { print STDERR "dpkg-statoverride: @_\n\n"; print("You need --help.\n"); exit(2); }
# vi: ts=8 sw=8 ai si cindent
|
