shadowdaoandClaude Opus 5
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The AppImage came up blank on CachyOS with `Could not create default EGL display: EGL_BAD_PARAMETER. Aborting...`, and the DMA-BUF workaround already in `main.rs` did not help — verified by finding the flag compiled into the shipped 0.4.19 binary, where it runs unconditionally on Linux. It is a different fault with the same error text. linuxdeploy bundles `libwayland-client.so.0` as a GTK dependency and `AppRun.wrapped` puts the bundled directory ahead of the host's, so the host's Mesa resolves against our copy. `libEGL_mesa.so.0` — the driver libglvnd's `libEGL.so.1` dlopens — has a hard DT_NEEDED on that library, so when its symbols will not resolve the driver never loads, glvnd is left with none, and `eglGetDisplay` reports no display. That is why `GDK_BACKEND=x11` does not dodge it, and why the symptom is a bad-parameter error rather than a link failure. Bisected on the reporter's machine against the released artifact — removing `libwayland-client.so.0` from the AppDir cleared the abort, while removing `libwayland-egl` or `libepoxy` did not. The bundled copy (Ubuntu 22.04, wayland 1.20) is missing eleven symbols their wayland 1.26 exports, including `wl_proxy_get_display`, `wl_proxy_get_queue`, `wl_display_create_queue_with_name` and `wl_fixes_interface`. Bundling a newer wayland would defer this, not fix it: the floor is set by the host's Mesa, which updates independently of our releases, so any version we pick is one release away from being too old again. This is a host-coupled library like libGL and libdrm — the only correct version is the host's. So the copy is demoted rather than deleted. It moves off the loader path into `usr/lib/wayland-fallback`, and a hook adds that directory back only when the host has no libwayland-client of its own — so a host without one still starts. The ordering is safe because `AppRun.wrapped` appends the inherited LD_LIBRARY_PATH after its own entries, making the hook a fallback and never an override. AppRun sources hooks by name rather than globbing, so it is patched to source this one. X11-only hosts are unaffected: libwayland-client is a package dependency of Mesa and GTK, so it is present even on a machine with no display server at all — confirmed on a headless container with neither DISPLAY nor WAYLAND_DISPLAY set. And the AppImage already runs as an X11 client everywhere, since linuxdeploy's own hook forces GDK_BACKEND=x11. Verified against the real 0.4.19 artifact rather than a synthetic AppDir: it repacks, the binary and AppRun survive, and both hook branches were exercised — host-has-it leaves LD_LIBRARY_PATH untouched, and a debian:12-slim container with no wayland at all engages the fallback. The comment in `main.rs` quoted this exact error as one the DMA-BUF flag fixes. That claim sent this investigation down the wrong path first, so it is corrected rather than left to do it again. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011YPqHpjV4EL6RNEwrRKqQm