I wouldn't change the permissions to mixed.

I'd try to track down ways to unzip without needing to modify permissions. Is there perhaps a cli flag for the unzip command?

-----Original Message-----
From: toasters-bounces@teaparty.net <toasters-bounces@teaparty.net> On Behalf Of Ehrenwald, Ian
Sent: Wednesday, May 9, 2018 12:28 PM
To: toasters@teaparty.net
Subject: Mac OS X, SMB NTFS, and chmod/chown

Hello
I have users on Mac OS X that are unable to uncompress zip files in SMB shares which sit on top of NTFS security style volumes.  I hadn't heard of this problem until I started migrating my users to new shares, previously they were all on UNIX security style volumes.

If I am understanding my users correctly, they can reliably reproduce this problem this way:
    - In Finder, right click on a folder on a share, select Compress
    - Zip file is created successfully on share
    - Double click on Zip file that was created
    - Mac OS X archiver utility pops up an error box, "Unable to expand (zip name) into (target dir).  (Error 13 - Permission denied).

Examining the Zip file from the command line shows that it is a fully formed file, no corruption, etc.  When I attempt to uncompress the Zip file using the command line on the same machine that created it, I can see that unzip is attempting to chmod the files and directories and getting a Permission Denied error back from the svm.  Output:

UserMachine:z TheUser$ unzip 3\:14\:18.zip
Archive:  3:14:18.zip
   creating: 3:14:18/    chmod (directory attributes) error: Permission denied
  inflating: 3:14:18/FileNameXYZ.FC3.idml  fchmod (file attributes) error: Permission denied
   creating: __MACOSX/    chmod (directory attributes) error: Permission denied
   creating: __MACOSX/3:14:18/    chmod (directory attributes) error: Permission denied
  inflating: __MACOSX/3:14:18/._FileNameXYZ.FC3.idml  fchmod (file attributes) error: Permission denied
  inflating: 3:14:18/FileNameABC.ai  fchmod (file attributes) error: Permission denied
  inflating: __MACOSX/3:14:18/._FileNameABC.ai  fchmod (file attributes) error: Permission denied
  inflating: 3:14:18/FileNameLMN.png  fchmod (file attributes) error: Permission denied
  inflating: __MACOSX/3:14:18/._FileNameLMN.png  fchmod (file attributes) error: Permission denied
  inflating: 3:14:18/FileNameXYZ.FC3.indd  fchmod (file attributes) error: Permission denied
  inflating: __MACOSX/3:14:18/._FileNameXYZ.FC3.indd  fchmod (file attributes) error: Permission denied

warning:  cannot set permissions for __MACOSX/3:14:18/          Permission denied
warning:  set times/attribs failed for __MACOSX/3:14:18/
warning:  cannot set permissions for __MACOSX/          Permission denied
warning:  set times/attribs failed for __MACOSX/
warning:  cannot set permissions for 3:14:18/          Permission denied
warning:  set times/attribs failed for 3:14:18/ UserMachine:z TheUser$

This does make sense, since SMB/CIFS doesn't really understand UNIX ownership and attributes.  Is the solution setting the security style of the volume to Mixed?  Reading in detail about it at https://whyistheinternetbroken.wordpress.com/2017/01/24/mixed-perceptions-multiprotocol-nas makes it seem like that's the right path to follow, but before I start down that trail I wanted to see what other people have done in this situation.

Thanks for your help.


Ian Ehrenwald
Senior Infrastructure Engineer
Hachette Book Group, Inc.
1.617.263.1948 / ian.ehrenwald@hbgusa.com

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