Runner: core.exportVariable does not set variable LD_LIBRARY_PATH value on MacOS

[SeyfSV]

Describe the bug
core.exportVariable does not set variable with underscores (ex. LD_LIBRARY_PATH) on macos-latest runner.
It works good on ubuntu-latest and windows-latest.
Not all variables with underscores can't be set, for example with varible ENV_VARIABLE issue does not occur.

To Reproduce
Create action and call core.exportVariable('LD_LIBRARY_PATH', 'test').
Run Actions within macos-latest runner

Expected behavior
LD_LIBRARY_PATH is set

_modified according to note_

[thboop]

Hey @SeyfSV I've been unable to reproduce this issue. Do you have a link to your run and action, or could you provide more information?

I created a custom action with the following typescript:

import * as core from '@actions/core'

async function run(): Promise<void> {
  try {
    core.exportVariable('ENV_VARIABLE', 'test')
    core.info('Ran the action')
  } catch (error) {
    core.setFailed(error.message)
  }
}

run()

Using @actions/core 1.2.2.

I then used the following workflow file

name: Test CI

on: [push]
jobs:
  test:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest, windows-latest]
    steps:
      - uses: thboop/typescript-action@master # your action should go here
      - run: echo $ENV_VARIABLE
        shell: bash

On all three platforms, the second step output "test" as expected.

[SeyfSV]

Hi @thboop,
I am sorry, I checked issue and found that it was not clear explanation :(
Please, try to set LD_LIBRARY_PATH variable.
On my test action I get:
ubuntu:

macOS:

Action: https://github.com/SeyfSV/actions-test
Flow: https://github.com/SeyfSV/actions-env

[thboop]

@SeyfSV , thanks for the updated information I've been able to confirm what you are seeing! This appears to be a Runner issue related to that particular environmental variable I'm moving the ticket there so we can get it resolved!

[thboop]

May be related to how we set up the .env file: https://github.com/actions/runner/blob/6c70d53eead402ba5d53676d6ed649a04e219c9b/src/Misc/layoutroot/env.sh#L12

[SeyfSV]

I do not think so, because DYLD_LIBRARY_PATH and DYLD_LIBRARY_PATH_A variables have same behaviour:
MacOS:

Ubuntu:

[TingluoHuang]

might related to https://apple.stackexchange.com/questions/278385/environment-var-ld-library-path-weirdly-hidden-under-bash-on-mac?noredirect=1&lq=1

https://developer.apple.com/library/archive/documentation/Security/Conceptual/System_Integrity_Protection_Guide/RuntimeProtections/RuntimeProtections.html

[TingluoHuang]

I am going to close this issue since it looks like a limitation of macOS. ☝️apple doc above
Feel free to reopen it if you think anything we can help.