Bug #68926 [Ana]: is_writable returns false but file_put_contents works

Edit report at https://bugs.php.net/bug.php?id=68926&edit=1 ID: 68926 Updated by: yohgaki@php.net Reported by: lukyer at gmail dot com Summary: is_writable returns false but file_put_contents works Status: Analyzed Type: Bug Package: *Directory/Filesystem functions Operating System: Windows 8 64b Prof. PHP Version: 5.6Git-2015-01-27 (Git) Assigned To: ab Block user comment: N Private report: N New Comment: This issue is related to SAMBA. Anyone who experiences this, please add your Samba configurations. There is similar issue reported for session storage on mounted (shared) file system. This may be the reason why some users have session storage issue on mounted files under windows. Previous Comments: ------------------------------------------------------------------------ [2015-06-04 19:13:28] webmastersguide2000 at yahoo dot com I get a similar symptom going back to at least 5.4.19, but without Samba. We are running: PHP Version 5.4.19 System Windows NT DEV-LMS2 6.1 build 7601 (Windows Server 2008 R2 Enterprise Edition Service Pack 1) i586 Build Date Aug 21 2013 01:06:09 Compiler MSVC9 (Visual C++ 2008) Architecture x86 Configure Command cscript /nologo configure.js "--enable-snapshot-build" "--enable-debug-pack" "--disable-zts" "--disable-isapi" "--disable-nsapi" "--without-mssql" "--without-pdo-mssql" "--without-pi3web" "--with-pdo-oci=C:\php-sdk\oracle\instantclient10\sdk,shared" "--with-oci8=C:\php-sdk\oracle\instantclient10\sdk,shared" "--with-oci8-11g=C:\php-sdk\oracle\instantclient11\sdk,shared" "--with-enchant=shared" "--enable-object-out-dir=../obj/" "--enable-com-dotnet=shared" "--with-mcrypt=static" "--disable-static-analyze" "--with-pgo" In my case at least, is_writeable also returns false for directories which are writeable. ------------------------------------------------------------------------ [2015-02-12 19:00:59] ab@php.net I've spent some time on debugging this and can confirm. The reason for this behavior is here https://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/ChangeNotes.html#id2578661 . You probably could check that - you use samba3 or above - the folder owner is mapped to something like "nobody", with either full or restricted access rights (use right click -> security -> advanced) You also could play with the access rights on the linux machine, just to see whether it changes something in PHP behavior. The issue here is that unmapped unix user accounts are mapped to built-in windows SIDs, which are obviously have nothing to do with windows ACLs. We could currently look whether it's possible to cover this part within PHP. In general it looks more like samba compat issue, because as you've mentioned - the native shares work well. Regards ------------------------------------------------------------------------ [2015-01-29 07:12:51] lukyer at gmail dot com Drive Z in my case is Samba mapped drive using "Map network drive" function in Windows Explorer. "tmp (\\192.168.0.15\bughunt)". Any other drives works as expected. Just network Samba drives are problematic. var_dump(is_writable('Z:\tmp')); var_dump(file_put_contents('Z:\tmp\hello.txt', 'hello')); output: bool(false) int(5) ------------------------------------------------------------------------ [2015-01-28 14:53:10] ab@php.net Cannot reproduce here: var_dump(is_writable('p:\tmp')); var_dump(file_put_contents('p:\tmp\hello.txt', 'hello')); this delivers bool(true) int(5) @lukyer please check what exactly is causing this behavior and provide some more data, so we can reproduce and debug. Thanks. ------------------------------------------------------------------------ [2015-01-27 21:38:42] lukyer at gmail dot com Description: ------------ When samba drive is mapped in Windows, call to is_writable returns false on folders and files although these are actually writable. is_readable seems working ok. Test script: --------------- echo is_writeable("Z://fdvtest"); // returns 0 file_put_contents("Z://fdvtest/file", "content"); // works fine ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=68926&edit=1