Bug #77229 [Ana->Nab]: Phar::buildFromDirectory() generates tar archives in 'PAX' format

Edit report at https://bugs.php.net/bug.php?id=77229&edit=1 ID: 77229 Updated by: nielsdos@php.net Reported by: michae dot lee at zerustech dot com Summary: Phar::buildFromDirectory() generates tar archives in 'PAX' format -Status: Analyzed +Status: Not a bug Type: Bug Package: PHAR related Operating System: macOS High Sierra 10.13.6 PHP Version: 7.4 Block user comment: N Private report: N New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php As described by previous comments there is no bug here. Previous Comments: ------------------------------------------------------------------------ [2020-11-26 13:28:32] cmb@php.net This has nothing to do with PAX format (phar tars are in ustar format), but rather is related to the basic tar format, which is supposed to store the mtime in header bytes 136-147, but we're storing the current time[1]. [1] <https://github.com/php/php-src/blob/php-7.4.13/ext/phar/util.c#L577> ------------------------------------------------------------------------ [2018-12-04 06:03:55] hanskrentel at yahoo dot de It can also be - I think like w/ from iterator - that temporary files are in use behind the secenes with new timestamps in each operation and therefore changing the checksum. To create phar file in a reproducible manner it normally needs to store the phar file and then to modify the binary records resetting the timestamps in there, e.g. to the latest timestamp of the revision in CVS or in your example you perhaps want to keep track of file-system timestamps and binary edit the phar file to sync those w/ the file-system. See the phar build script in the composer project for some reference on how to do that. ------------------------------------------------------------------------ [2018-12-03 03:46:38] michae dot lee at zerustech dot com PHP version is 7.2.4 ------------------------------------------------------------------------ [2018-12-03 02:54:23] michae dot lee at zerustech dot com Description: ------------ The Phar::buildFromDirectory() method generates tar archives in PAX format, so different tar archives that contain the same files may have different sha1 checksums. Test script: --------------- <?php // mkdir test && echo 'hello' > test/test.txt $phar = new \PharData('a.tar'); $phar->buildFromDirectory('test'); // sleep for 1 second to produce different atime. sleep(1); $phar = new \PharData('b.tar'); $phar->buildFromDirectory('test'); echo sha1_file('a.tar') . "\n"; echo sha1_file('b.tar') . "\n"; // a.tar and b.tar contain the same files, but have different checksums // Looks like the buildFromDirectory() method generates tar archives // with PAX headers. Calling "tar --format=ustar -cf ..." from command line // resolves this issue. Expected result: ---------------- The sha1 checksums for a.tar and b.tar should be the same. Actual result: -------------- The sha1 checksums for a.tar and b.tar are different. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77229&edit=1