use IO::Select;
use File::Basename;
use File::Path qw(make_path);
+use Filesys::Df (); # don't overwrite our df()
+use IO::Pipe;
use IO::File;
use IO::Dir;
use IPC::Open3;
mkdir $pvelogdir;
mkdir $pvetaskdir;
-my $IPV4OCTET = "(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])";
+my $IPV4OCTET = "(?:25[0-5]|(?:2[0-4]|1[0-9]|[1-9])?[0-9])";
our $IPV4RE = "(?:(?:$IPV4OCTET\\.){3}$IPV4OCTET)";
my $IPV6H16 = "(?:[0-9a-fA-F]{1,4})";
my $IPV6LS32 = "(?:(?:$IPV4RE|$IPV6H16:$IPV6H16))";
"(?:(?:(?:(?:$IPV6H16:){0,5}$IPV6H16)?::" . ")$IPV6H16)|" .
"(?:(?:(?:(?:$IPV6H16:){0,6}$IPV6H16)?::" . ")))";
+our $IPRE = "(?:$IPV4RE|$IPV6RE)";
+
+use constant {CLONE_NEWNS => 0x00020000,
+ CLONE_NEWUTS => 0x04000000,
+ CLONE_NEWIPC => 0x08000000,
+ CLONE_NEWUSER => 0x10000000,
+ CLONE_NEWPID => 0x20000000,
+ CLONE_NEWNET => 0x40000000};
+
sub run_with_timeout {
my ($timeout, $code, @param) = @_;
# -) an array of arguments (strings)
# Will be executed without interference from a shell. (Parameters are passed
# as is, no escape sequences of strings will be touched.)
+# -) an array of arrays
+# Each array represents a command, and each command's output is piped into
+# the following command's standard input.
+# For this a shell command string is created with pipe symbols between each
+# command.
+# Each command is a list of strings meant to end up in the final command
+# unchanged. In order to achieve this, every argument is shell-quoted.
+# Quoting can be disabled for a particular argument by turning it into a
+# reference, this allows inserting arbitrary shell options.
+# For instance: the $cmd [ [ 'echo', 'hello', \'>/dev/null' ] ] will not
+# produce any output, while the $cmd [ [ 'echo', 'hello', '>/dev/null' ] ]
+# will literally print: hello >/dev/null
sub run_command {
my ($cmd, %param) = @_;
my $old_umask;
my $cmdstr;
- if (!ref($cmd)) {
+ if (my $ref = ref($cmd)) {
+ if (ref($cmd->[0])) {
+ $cmdstr = 'set -o pipefail && ';
+ my $pipe = '';
+ foreach my $command (@$cmd) {
+ # concatenate quoted parameters
+ # strings which are passed by reference are NOT shell quoted
+ $cmdstr .= $pipe . join(' ', map { ref($_) ? $$_ : shellquote($_) } @$command);
+ $pipe = ' | ';
+ }
+ $cmd = [ '/bin/bash', '-c', "set -o pipefail && $cmdstr" ];
+ } else {
+ $cmdstr = cmd2string($cmd);
+ }
+ } else {
$cmdstr = $cmd;
if ($cmd =~ m/\|/) {
# see 'man bash' for option pipefail
} else {
$cmd = [ $cmd ];
}
- } else {
- $cmdstr = cmd2string($cmd);
}
my $errmsg;
# NOTE: NFS syscall can't be interrupted, so alarm does
# not work to provide timeouts.
# from 'man nfs': "Only SIGKILL can interrupt a pending NFS operation"
-# So the spawn external 'df' process instead of using
-# Filesys::Df (which uses statfs syscall)
+# So fork() before using Filesys::Df
sub df {
my ($path, $timeout) = @_;
- my $cmd = [ 'df', '-P', '-B', '1', $path];
-
my $res = {
total => 0,
used => 0,
avail => 0,
};
- my $parser = sub {
- my $line = shift;
- if (my ($fsid, $total, $used, $avail) = $line =~
- m/^(\S+.*)\s+(\d+)\s+(\d+)\s+(\d+)\s+\d+%\s.*$/) {
- $res = {
- total => $total,
- used => $used,
- avail => $avail,
- };
+ my $pipe = IO::Pipe->new();
+ my $child = fork();
+ if (!defined($child)) {
+ warn "fork failed: $!\n";
+ return $res;
+ }
+
+ if (!$child) {
+ $pipe->writer();
+ eval {
+ my $df = Filesys::Df::df($path, 1);
+ print {$pipe} "$df->{blocks}\n$df->{used}\n$df->{bavail}\n";
+ $pipe->close();
+ };
+ if (my $err = $@) {
+ warn $err;
+ POSIX::_exit(1);
}
+ POSIX::_exit(0);
+ }
+
+ $pipe->reader();
+
+ my $readvalues = sub {
+ $res->{total} = int(<$pipe>);
+ $res->{used} = int(<$pipe>);
+ $res->{avail} = int(<$pipe>);
+ };
+ eval {
+ run_with_timeout($timeout, $readvalues);
};
- eval { run_command($cmd, timeout => $timeout, outfunc => $parser); };
warn $@ if $@;
-
+ $pipe->close();
+ kill('KILL', $child);
+ waitpid($child, 0);
return $res;
}
my $rand = Digest::SHA::sha1_hex($$, rand(), $seconds, $microseconds);
- my $mac = '';
- for (my $i = 0; $i < 6; $i++) {
- my $ss = hex(substr($rand, $i*2, 2));
- if (!$i) {
- $ss &= 0xfe; # clear multicast
- $ss |= 2; # set local id
- }
- $ss = sprintf("%02X", $ss);
+ # clear multicast, set local id
+ vec($rand, 0, 8) = (vec($rand, 0, 8) & 0xfe) | 2;
- if (!$i) {
- $mac .= "$ss";
- } else {
- $mac .= ":$ss";
- }
- }
-
- return $mac;
+ return sprintf("%02X:%02X:%02X:%02X:%02X:%02X", unpack("C6", $rand));
}
sub shellquote {
return; # nothing
}
+sub unshare($) {
+ my ($flags) = @_;
+ return 0 == syscall(272, $flags);
+}
+
1;