meta-nilrt: worldwritable permissions

[Nasrulla-NI]

Summary of Changes

Currently NILRT will automatically mount block and TTY devices as world-writable and should be updated to no longer do this.
We should try to avoid just changing the permissions and should instead have some way to toggle the world-writable permissions back on if needed. Hence to do this - /etc/natinst/share/ni-rt.ini - worldwritable.enabled="true" or worldwritable.enabled="false" is appended as per information provided from hardware config team/

• Controls whether VFAT/TTY mounts are world-writable.
• 0 = default restrictive (fmask=0002,dmask=0002)
• 1 = world-writable (fmask=0000,dmask=0000)
• Reads /** /etc/natinst/share/ni-rt.ini - worldwritable.enabled="true" or worldwritable.enabled="false" **

Justification

Please refer below feature
https://dev.azure.com/ni/DevCentral/_workitems/edit/3470239

Testing

VFAT and TTY:
- worldwritable.enabled="false"

worldwritable.enabled="true"

• I have built the core package feed with this PR in place. (bitbake packagefeed-ni-core)

Procedure

• I certify that the contents of this pull request complies with the Developer Certificate of Origin.

[amstewart]

We should try to avoid just changing the permissions and should instead have some way to toggle the world-writable permissions back on if needed.

Why? Because of VISA? VISA has to run as a user that isn't root or a member of the dialout group?

[Nasrulla-NI]

We should try to avoid just changing the permissions and should instead have some way to toggle the world-writable permissions back on if needed.

Why? Because of VISA? VISA has to run as a user that isn't root or a member of the dialout group?

Thanks for the comment. Indeed, the change was aimed at supporting VISA, since it often runs as a non‑root user without dialout membership and needs access to these device nodes. So, added a config/feature flag so the relaxed permissions are enabled only when needed. This will be controlled from front end Hwconfig.