KeyError when trying to access env['PIOHOME_DIR']

[Pharap]

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Configuration

Operating system: Windows 8.1

PlatformIO Version (platformio --version): PlatformIO 4.0.3

Description of problem

Environment key 'PIOHOME_DIR' does not exist when running a 'pre' script.

Steps to Reproduce

1. Add the following to platformio.ini:

extra_scripts =
 pre:test.py

2. Create test.py with the following contents:

Import("env")

print env['PIOHOME_DIR']

Actual Results

Console gives errors:

KeyError: 'PIOHOME_DIR':
  File "C:\users\user\.platformio\penv\lib\site-packages\platformio\builder\main.py", line 124:
    env.SConscript(item, exports="env")
  File "I:\User\.platformio\packages\tool-scons\script\..\engine\SCons\Script\SConscript.py", line 541:
    return _SConscript(self.fs, *files, **subst_kw)
  File "I:\User\.platformio\packages\tool-scons\script\..\engine\SCons\Script\SConscript.py", line 250:
    exec _file_ in call_stack[-1].globals
  File "I:\Documents\Github\project\test.py", line 3:
    print env['PIOHOME_DIR']
  File "I:\User\.platformio\packages\tool-scons\script\..\engine\SCons\Environment.py", line 410:
    return self._dict[key]

Expected Results

Console should output either:

C:\users\user\.platformio

Or:

I:\User\.platformio

* C:\users\user\.platformio is a symlink to I:\User\.platformio

[ivankravets]

pio run -t envdump

See valid variables

[ivankravets]

You need

platformio-core/platformio/builder/main.py

Line 61 in 1be2e51

PROJECTCORE_DIR=project_helpers.get_project_core_dir(),

[Pharap]

Do you happen to know when this change was made?
I couldn't find any mention of the environment variable names changing in the changelog.

[ivankravets]

These are internal variables and we use them for own needs. I recommend using PIO Core API instead.

platformio.project.helpers import get_project_core_dir

print(get_project_core_dir())

Please note that Core folder can differ between projects.