<?php
+# do not enable recursive tars by default
+$TAR_FLAGS = "--no-recursion";
+
+# send content length for browsers to display the progress bar
+# note : won't work if the http server uses Chunked transfer encoding (http://en.wikipedia.org/wiki/Chunked_transfer_encoding)
+# probably the case with gzip content-encoding.
+# For this we need to tar files to /dev/null before the real tar
+$SEND_CONTENT_LENGTH = true;
+
+########################
$bizouRootFromHere = '../..';
require "$bizouRootFromHere/config.php";
$filesarg = escapeshellarg(basename($realDir))."/*";
-$out = exec("tar --no-recursion --totals -cf /dev/null $filesarg 2>&1");
-preg_match('/^Total bytes written: ([0-9]+) /', $out, $matches);
-$totalsize = $matches[1];
+# compute and send content-length header
+if ($SEND_CONTENT_LENGTH) {
+ $out = exec("tar $TAR_FLAGS --totals -cf /dev/null $filesarg 2>&1");
+ preg_match('/^Total bytes written: ([0-9]+) /', $out, $matches);
+ $totalsize = $matches[1];
+
+ header("Content-Length: $totalsize");
+}
-header("Content-Length: $totalsize");
+# final step : stream the directory content via tar
header('Content-Type: application/x-tar');
header('Content-Disposition: attachment; filename="'.basename($realDir).'.tar"');
-passthru("tar --no-recursion -c $filesarg");
+passthru("tar $TAR_FLAGS -c $filesarg");
?>