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Editorial Team
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Asked: 2026-06-06T15:54:43+00:00

I am uncompressing a .gz-file and putting the output into tar with php. My

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I am uncompressing a .gz-file and putting the output into tar with php.
My code looks like 

$tar = proc_open('tar -xvf -', array(0 => array('pipe', 'r'), 1 => array('pipe', 'w'), 2 => array('pipe', 'a')), &$pipes);
$datalen = filesize('archive.tar.gz');
$datapos = 0;
$data = gzopen('archive.tar.gz', 'rb');
while (!gzeof($data))
{
    $step = 512;
    fwrite($pipes[0], gzread($data, $step));
    $datapos += $step;
}
gzclose($data);
proc_close($tar);

It works great (tar extracts a couple directories and files) until a bit more than halfway in (according to my $datapos) the compressed file, then the script will get stuck at the fwrite($pipes...) line forever (i waited a few minutes for it to advance).

The compressed archive is 8425648 bytes (8.1M) large, the uncompressed archive is 36720640 bytes (36M) large.

What am I possibly doing wrong here, since I havn’t found any resources considering a similar issue?

I’m running php5-cli version 5.3.3-7+squeeze3 (with Suhosin 0.9.32.1) on a 2.6.32-5-amd64 linux machine.

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1 Answer

  1. Editorial Team

    1 => array('pipe', 'w')

    You have tar giving you data (file names) on stdout. You should empty that buffer. (I normally just read it.)

    You can also send it to a file so you don’t have to deal with it.

    1 => array('file', '[file for filelist output]', 'a')

    if you’re on Linux, I like to do

    1 => array('file', '/dev/null', 'a')

    [Edit: Once it outputs enough, it’ll wait for you to read from standard out, which is where you are hanging.]

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