incorrect path to sky130 klayout lyp file

[proppy]

Currently open_pdks installs technology file in the current directory layout:

/home/proppy/.volare/sky130A/libs.tech/klayout
/home/proppy/.volare/sky130A/libs.tech/klayout/drc
/home/proppy/.volare/sky130A/libs.tech/klayout/scripts
/home/proppy/.volare/sky130A/libs.tech/klayout/tech
/home/proppy/.volare/sky130A/libs.tech/klayout/tech/sky130A.lyp
/home/proppy/.volare/sky130A/libs.tech/klayout/tech/sky130A.lyt
/home/proppy/.volare/sky130A/libs.tech/klayout/lvs
/home/proppy/.volare/sky130A/libs.tech/klayout/pymacros
/home/proppy/.volare/sky130A/libs.tech/klayout/macros
/home/proppy/.volare/sky130A/libs.tech/klayout/ruby
/home/proppy/.volare/sky130A/libs.tech/klayout/python
/home/proppy/.volare/sky130A/libs.tech/klayout/klayoutrc

which is slightly different from the one in https://github.com/mabrains/sky130_klayout_pdk

This causes reference to the lyp file not be resolved my initializing klayout with technology:

$ KLAYOUT_HOME=$PDK_ROOT/sky130A/libs.tech/klayout klayout -e
...
Warning: Initialization of layers failed: Unable to open file: /home/proppy/.volare/sky130A/libs.tech/klayout/tech/sky130/sky130A.lyp (errno=2)

One can fix the reference to the lyt file to drop the sky130 directory:
https://github.com/mabrains/sky130_klayout_pdk/blob/main/sky130_tech/tech/sky130/sky130.lyt#L7-L9
in order to workaround this issue:

 <base-path>$(appdata_path)/tech</base-path>
 <original-base-path>$(appdata_path)/tech</original-base-path>
 <layer-properties_file>sky130A.lyp</layer-properties_file>

[xobs]

Which one is correct? sky130 and gf180 are definitely different, as evidenced by the fact that klayout doesn't work with gf180: The-OpenROAD-Project/OpenLane#1593

[proppy]

another error related to this is klayout failing to load the lyp file:

Warning: Initialization of layers failed: Unable to open file: /home/proppy/mixed-signal-sky130a-env/share/pdk/sky130A/libs.tech/klayout/tech//sky130.lyp (errno=2)

I think this is due to the installation renaming the file from being named after the TECH (sky130) to being named after the pdk variant sky130A:

open_pdks/sky130/Makefile.in

Line 1011 in 78b7bc3

cp ${KLAYOUT_PATH}/sky130_tech/tech/sky130/${TECH}.lyt ${KLAYOUT_STAGING_$*}/tech/${SKY130$*}.lyt ; \