+sub unshare($) {
+ my ($flags) = @_;
+ return 0 == syscall(272, $flags);
+}
+
+sub setns($$) {
+ my ($fileno, $nstype) = @_;
+ return 0 == syscall(308, $fileno, $nstype);
+}
+
+sub syncfs($) {
+ my ($fileno) = @_;
+ return 0 == syscall(306, $fileno);
+}
+
+sub sync_mountpoint {
+ my ($path) = @_;
+ sysopen my $fd, $path, O_PATH or die "failed to open $path: $!\n";
+ my $result = syncfs(fileno($fd));
+ close($fd);
+ return $result;
+}
+
+# support sending multi-part mail messages with a text and or a HTML part
+# mailto may be a single email string or an array of receivers
+sub sendmail {
+ my ($mailto, $subject, $text, $html, $mailfrom, $author) = @_;
+
+ $mailto = [ $mailto ] if !ref($mailto);
+
+ my $rcvrarg = '';
+ foreach my $r (@$mailto) {
+ $rcvrarg .= " '$r'";
+ }
+ my $rcvrtxt = join (', ', @$mailto);
+
+ $mailfrom = $mailfrom || "root";
+ $author = $author || 'Proxmox VE';
+
+ open (MAIL,"|sendmail -B 8BITMIME -f $mailfrom $rcvrarg") ||
+ die "unable to open 'sendmail' - $!";
+
+ # multipart spec see https://www.ietf.org/rfc/rfc1521.txt
+ my $boundary = "----_=_NextPart_001_".int(time).$$;
+
+ print MAIL "Content-Type: multipart/alternative;\n";
+ print MAIL "\tboundary=\"$boundary\"\n";
+ print MAIL "MIME-Version: 1.0\n";
+
+ print MAIL "FROM: $author <$mailfrom>\n";
+ print MAIL "TO: $rcvrtxt\n";
+ print MAIL "SUBJECT: $subject\n";
+ print MAIL "\n";
+ print MAIL "This is a multi-part message in MIME format.\n\n";
+ print MAIL "--$boundary\n";
+
+ if (defined($text)) {
+ print MAIL "Content-Type: text/plain;\n";
+ print MAIL "\tcharset=\"UTF8\"\n";
+ print MAIL "Content-Transfer-Encoding: 8bit\n";
+ print MAIL "\n";
+
+ # avoid 'remove extra line breaks' issue (MS Outlook)
+ my $fill = ' ';
+ $text =~ s/^/$fill/gm;
+
+ print MAIL $text;
+
+ print MAIL "\n--$boundary\n";
+ }
+
+ if (defined($html)) {
+ print MAIL "Content-Type: text/html;\n";
+ print MAIL "\tcharset=\"UTF8\"\n";
+ print MAIL "Content-Transfer-Encoding: 8bit\n";
+ print MAIL "\n";
+
+ print MAIL $html;
+
+ print MAIL "\n--$boundary--\n";
+ }
+
+ close(MAIL);
+}
+
+sub tempfile {
+ my ($perm, %opts) = @_;
+
+ # default permissions are stricter than with file_set_contents
+ $perm = 0600 if !defined($perm);
+
+ my $dir = $opts{dir} // '/tmp';
+ my $mode = $opts{mode} // O_RDWR;
+ $mode |= O_EXCL if !$opts{allow_links};
+
+ my $fh = IO::File->new($dir, $mode | O_TMPFILE, $perm)
+ or die "failed to create tempfile: $!\n";
+ return $fh;
+}
+
+sub tempfile_contents {
+ my ($data, $perm, %opts) = @_;
+
+ my $fh = tempfile($perm, %opts);
+ eval {
+ die "unable to write to tempfile: $!\n" if !print {$fh} $data;
+ die "unable to flush to tempfile: $!\n" if !defined($fh->flush());
+ };
+ if (my $err = $@) {
+ close $fh;
+ die $err;
+ }
+
+ return ("/proc/$$/fd/".$fh->fileno, $fh);
+}
+
+sub validate_ssh_public_keys {
+ my ($raw) = @_;
+ my @lines = split(/\n/, $raw);
+
+ foreach my $line (@lines) {
+ next if $line =~ m/^\s*$/;
+ eval {
+ my ($filename, $handle) = tempfile_contents($line);
+ run_command(["ssh-keygen", "-l", "-f", $filename],
+ outfunc => sub {}, errfunc => sub {});
+ };
+ die "SSH public key validation error\n" if $@;
+ }
+}
+