GDS files empty in magic when edited with klayout

[w32agobot]

Describe the bug
GDS files can not be viewed with magic if they were edited with klayout

To Reproduce
Preparation:

• Start container
• Open terminal in /foss/designs
• cp -r /foss/tools/openlane/2023.01/designs/spm /foss/designs/spm
• flow.tcl -design spm -tag foo
• cd spm/runs/foo/results/final/gds/

Check if gds can be opened with magic

• magic spm.gds
• Everything's okay, close magic

Force issue:

• ke spm.gds
• Warning: Initialization of layers failed: Unable to open file: /headless/.klayout/tech/sky130/sky130.lyp (errno=2)
• File - Save
• close klayout

Check again if gds can be opened with magic

• magic spm.gds
• magic view is empty

Expected behavior
Magic can open the modified gds file

Environment:

• OS: Windows
• Operating mode: VNC
• Version tag 2023.01

Additional context

• My workaround is using version tag 2022.12
• Also happens in tag next with 2023.02

[hpretl]

This might be related to this issue, to be further investigated: KLayout/klayout#1279

[w32agobot]

I tiried to workaround by:
copy /headless/.klayout/tech/sky130 in 2022.12
paste /headless/.klayout/tech/sky130 in latest

The warning is gone but magic still can't display the modified gds file.

In 2022.12 the folder /headless/.klayout/tech/sky130 with sky130.lyp exists, but in latest it does not. I suspect there's information about the sky130 path embedded in the openLane-generated gds file (see file - layout properties and tools - manage technologies), therefore klayout still searches for sky130.lyp despite the command line option

[hpretl]

I think I have found the issue, will try a patch of the klayout techfiles.

[hpretl]

Closed, for explanation see here RTimothyEdwards/magic#221