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package run_program; # $Id: run_program.pm 266118 2010-02-11 14:57:12Z pterjan $
use diagnostics;
use strict;
use c;
use MDK::Common;
use common; # for get_parent_uid()
use log;
1;
my $default_timeout = 10 * 60;
sub set_default_timeout {
my ($seconds) = @_;
$default_timeout = $seconds;
}
sub run_or_die {
my ($name, @args) = @_;
run($name, @args) or die "$name failed\n";
}
sub rooted_or_die {
my ($root, $name, @args) = @_;
rooted($root, $name, @args) or die "$name failed\n";
}
sub get_stdout {
my ($name, @args) = @_;
my @r;
run($name, '>', \@r, @args) or return;
wantarray() ? @r : join('', @r);
}
sub get_stdout_raw {
my ($options, $name, @args) = @_;
my @r;
raw($options, $name, '>', \@r, @args) or return;
wantarray() ? @r : join('', @r);
}
sub rooted_get_stdout {
my ($root, $name, @args) = @_;
my @r;
rooted($root, $name, '>', \@r, @args) or return;
wantarray() ? @r : join('', @r);
}
sub run { raw({}, @_) }
sub rooted {
my ($root, $name, @args) = @_;
raw({ root => $root }, $name, @args);
}
sub raw {
my ($options, $name, @args) = @_;
my $root = $options->{root} || '';
my $real_name = ref($name) ? $name->[0] : $name;
my ($stdout_raw, $stdout_mode, $stderr_raw, $stderr_mode);
($stdout_mode, $stdout_raw, @args) = @args if $args[0] =~ /^>>?$/;
($stderr_mode, $stderr_raw, @args) = @args if $args[0] =~ /^2>>?$/;
my $home;
if ($options->{as_user}) {
my $uid;
$uid = $ENV{USERHELPER_UID} && getpwuid($ENV{USERHELPER_UID});
$uid ||= common::get_parent_uid();
$options->{setuid} = getpwnam($uid) if $uid;
my ($full_user) = grep { $_->[2] eq $uid } list_passwd();
$home = $full_user->[7] if $full_user;
}
local $ENV{HOME} = $home if $home;
my $args = $options->{sensitive_arguments} ? '<hidden arguments>' : join(' ', @args);
log::explanations("running: $real_name $args" . ($root ? " with root $root" : ""));
return if $root && $<;
$root ? ($root .= '/') : ($root = '');
my $tmpdir = sub {
my $dir = $< != 0 ? "$ENV{HOME}/tmp" : -d '/root' ? '/root/tmp' : '/tmp';
-d $dir or mkdir($dir, 0700);
$dir;
};
my $stdout = $stdout_raw && (ref($stdout_raw) ? $tmpdir->() . "/.drakx-stdout.$$" : "$root$stdout_raw");
my $stderr = $stderr_raw && (ref($stderr_raw) ? $tmpdir->() . "/.drakx-stderr.$$" : "$root$stderr_raw");
#- checking if binary exist to avoid clobbering stdout file
my $rname = $real_name =~ /(.*?)[\s\|]/ ? $1 : $real_name;
if (! ($rname =~ m!^/!
? -x "$root$rname" || $root && -l "$root$rname" #- handle non-relative symlink which can be broken when non-rooted
: whereis_binary($rname, $root))) {
log::l("program not found: $real_name");
return;
}
if (my $pid = fork()) {
if ($options->{detach}) {
$pid;
} else {
my $ok;
add2hash_($options, { timeout => $default_timeout });
eval {
local $SIG{ALRM} = sub { die "ALARM" };
my $remaining = $options->{timeout} && $options->{timeout} ne 'never' && alarm($options->{timeout});
waitpid $pid, 0;
$ok = $? == -1 || ($? >> 8) == 0;
alarm $remaining;
};
if ($@) {
log::l("ERROR: killing runaway process (process=$real_name, pid=$pid, args=@args, error=$@)");
kill 9, $pid;
return;
}
if ($stdout_raw && ref($stdout_raw)) {
if (ref($stdout_raw) eq 'ARRAY') {
@$stdout_raw = cat_($stdout);
} else {
$$stdout_raw = cat_($stdout);
}
unlink $stdout;
}
if ($stderr_raw && ref($stderr_raw)) {
if (ref($stderr_raw) eq 'ARRAY') {
@$stderr_raw = cat_($stderr);
} else {
$$stderr_raw = cat_($stderr);
}
unlink $stderr;
}
$ok;
}
} else {
if ($options->{setuid}) {
require POSIX;
my ($logname, $home) = (getpwuid($options->{setuid}))[0,7];
$ENV{LOGNAME} = $logname if $logname;
# if we were root and are going to drop privilege, keep a copy of the X11 cookie:
if (!$> && $home) {
# FIXME: it would be better to remove this but most callers are using 'detach => 1'...
my $xauth = chomp_(`mktemp $home/.Xauthority.XXXXX`);
system('cp', '-a', $ENV{XAUTHORITY}, $xauth);
system('chown', $logname, $xauth);
$ENV{XAUTHORITY} = $xauth;
}
# drop privileges:
POSIX::setuid($options->{setuid});
}
sub die_exit {
log::l($_[0]);
c::_exit(128);
}
if ($stderr && $stderr eq 'STDERR') {
} elsif ($stderr) {
$stderr_mode =~ s/2//;
open STDERR, "$stderr_mode $stderr" or die_exit("run_program cannot output in $stderr (mode `$stderr_mode')");
} elsif ($::isInstall) {
open STDERR, ">> /tmp/ddebug.log" or open STDOUT, ">> /dev/tty7" or die_exit("run_program cannot log, give me access to /tmp/ddebug.log");
}
if ($stdout && $stdout eq 'STDOUT') {
} elsif ($stdout) {
open STDOUT, "$stdout_mode $stdout" or die_exit("run_program cannot output in $stdout (mode `$stdout_mode')");
} elsif ($::isInstall) {
open STDOUT, ">> /tmp/ddebug.log" or open STDOUT, ">> /dev/tty7" or die_exit("run_program cannot log, give me access to /tmp/ddebug.log");
}
$root and chroot $root;
chdir($options->{chdir} || "/");
my $ok = ref $name ? do {
exec { $name->[0] } $name->[1], @args;
} : do {
exec $name, @args;
};
if (!$ok) {
die_exit("exec of $real_name failed: $!");
}
}
}
# run in background a sub that give back data through STDOUT a la run_program::get_stdout but w/ arbitrary perl code instead of external program
package bg_command;
sub new {
my ($class, $sub) = @_;
my $o = bless {}, $class;
if ($o->{pid} = open(my $fd, "-|")) {
$o->{fd} = $fd;
$o;
} else {
$sub->();
c::_exit(0);
}
}
sub DESTROY {
my ($o) = @_;
close $o->{fd} or warn "kid exited $?";
waitpid $o->{pid}, 0;
}
1;
#- Local Variables:
#- mode:cperl
#- tab-width:8
#- End:
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