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<https://github.com/The-OpenROAD-Project/OpenLane/issues/1616|#1616 `ref::$PDKPATH` results in empty strings in `config.json`>
Issue created by <https://github.com/xobs|xobs>
*Description*

The documentation says that it is acceptable to use variables such as `ref::$PDKPATH` inside `config.json`. However, doing so results in an empty string.

For example:

config.json:

```
        "EXTRA_LEFS": [
            "ref::$PDKPATH/gf180mcuC/libs.ref/gf180mcu_fd_ip_sram/lef/gf180mcu_fd_ip_sram__sram512x8m8wm1.lef"
        ],
```

config_in.tcl:

```
set ::env(EXTRA_LEFS) {}
```

*Expected Behavior*

The documentation states that variables can be interpolated by beginning the string with `ref::`, and that `$PDKPATH` is an acceptable variable. This should result in a valid, nonempty string that starts with the requested variable.

*Environment report*

```
Kernel: Linux v5.15.79.1-microsoft-standard-WSL2
Distribution: ubuntu 22.04
Python: v3.10.6 (OK)
Container Engine: docker v20.10.21 (OK)
OpenLane Git Version: e570a6a5b428eddb19f8efe4f9d18d79f1050940
pip: INSTALLED
python-venv: INSTALLED
---
PDK Version Verification Status: MISMATCH
The version of open_pdks used in building the PDK does not match the version OpenLane was tested on (installed: 0059588eebfc704681dc2368bd1d33d96281d10f, tested: 3f9bdbd857564726b731760dc2c817e84ca7d8ac)
This may introduce some issues. You may want to re-install the PDK by invoking `make pdk`.
---
Git Log (Last 3 Commits)

e570a6a 2023-01-02T15:10:43+02:00 `run_designs` fixes (#1597) - Mohamed Gaber -  (grafted, HEAD, tag: 2023.01.03)
---
Git Remotes

origin  <https://github.com/The-OpenROAD-Project/OpenLane> (fetch)
origin  <https://github.com/The-OpenROAD-Project/OpenLane> (push)
```

*Reproduction material*

<https://github.com/The-OpenROAD-Project/OpenLane/files/10399929/issue_reproducible.tar.gz|issue_reproducible.tar.gz>

*Relevant log output*

```
[ERROR]: Floorplanning failed
[ERROR]: module gf180mcu_fd_ip_sram__sram512x8m8wm1 not found in /si/work/caravel-minimax/openlane/mimi/runs/23_01_12_16_55/tmp/merged.nom.lef
[ERROR]: Check whether EXTRA_LEFS is set appropriately
```
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>

<https://github.com/The-OpenROAD-Project/OpenLane/issues/1616|#1616 `ref::$PDKPATH` results in empty strings in `config.json`>
Issue closed as completed by <https://github.com/donn|donn>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>

<https://github.com/The-OpenROAD-Project/OpenLane/issues/1616|#1616 `ref::$PDKPATH` results in empty strings in `config.json`>
Issue reopened by <https://github.com/kareefardi|kareefardi>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>

<https://github.com/The-OpenROAD-Project/OpenLane/issues/1616|#1616 `ref::$PDKPATH` results in empty strings in `config.json`>
Issue closed as completed by <https://github.com/kareefardi|kareefardi>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>