can not edit trees on mac

[joshStillerman]

Affiliation
MIT Plasma Science and Fusion Center

Version(s) Affected
MDSplus version: 7.139.28

Release: alpha_release_7.139.28
Browse: https://github.com/MDSplus/mdsplus/tree/alpha_release_7.139.28
Download: https://github.com/MDSplus/mdsplus/archive/alpha_release_7.139.28.tar.gz

Platform(s)
intel macbook
% uname -a
Darwin Joshuas-MacBook-Pro-2.local 25.2.0 Darwin Kernel Version 25.2.0: Tue Nov 18 21:09:34 PST 2025; root:xnu-12377.61.12~1/RELEASE_X86_64 x86_64

Describe the bug
With default_tree_path=/tmp. (which I believe is apfs mount)
If I edit a tree and try to add a node it complains

Error was: %TREE-W-LOCK_FAILURE, Error locking file, perhaps NFSLOCKING not enabled on this system

To Reproduce

% export default_tree_path=/tmp
% mdstcl
TCL> edit /new ss
TCL> add node noop /usage=numeric
Error adding node noop
Error was: %TREE-W-LOCK_FAILURE, Error locking file, perhaps NFSLOCKING not enabled on this system
mdsdcl: --> failed on line 'add node noop /usage=numeric'
TCL> 

Additional context
Not yet tested on Arm based MAC

[mwinkel-dev]

Hi @joshStillerman -- I edit trees all the time on my M2 MacBook Pro running Tahoe 26.2. My disk's volume is formatted with APFS. I'm using a developer build of MDSplus alpha-7-157-1. Creates trees in any directory that I specify, including /tmp.

% mdstcl
TCL> edit josh /shot=123 /new
TCL> add node num1 /usage=numeric
TCL> put num1 55
TCL> write
TCL> close
TCL> set tree josh /shot=123
TCL> dir

\JOSH::TOP

 :NUM1        

Total of 1 node.
TCL> show data num1
\JOSH::TOP:NUM1
 DTYPE_L                       : 55 
TCL> quit
%

Tomorrow, I will test creating trees on my Intel Mac mini.

[mwinkel-dev]

Hi @joshStillerman -- The alpha-7-139-28 on your Intel Mac is from 7-Apr-2023. Try upgrading to a newer release for macOS and see if that is able to edit trees.

[mwinkel-dev]

Hi @joshStillerman -- A developer build of alpha-7-157-4 done on an Intel Mac mini was able to edit trees in any directory (including "/tmp") plus also passed the automated test suite. The build has just been made available to you.