250985 2023-01-22 11:09:23 -0800 [GTK] mesa fails to create shader cache, xdg cache dir not mounted in flatpak-spawn subsandbox 2023-06-28 06:42:55 -0700 1 1 1 Unclassified WebKit WebKitGTK Other PC Linux RESOLVED MOVED P2 Normal --- 218121 1 nekohayo webkit-unassigned bugs-noreply mcatanzaro pgriffis oldest_to_newest 1927303 0 nekohayo 2023-01-22 11:09:23 -0800 Originally reported at https://gitlab.gnome.org/GNOME/epiphany/-/issues/1957 : With the EpiphanyDevel flatpak from gnome nightly, this gets printed multiple times in the terminal on startup: `Failed to create /home/user/.var/app/org.gnome.Epiphany.Devel/cache for shader cache (No such file or directory)---disabling.` ...even with the local storage/caching setting turned on in the Privacy tab in the Preferences dialog. And yet, the folder exists, and has subfolders: ``` $ ls ~/.var/app/org.gnome.Epiphany.Devel/cache epiphany fontconfig mesa_shader_cache tmp webkitgtk-6.0 ``` 1927330 1 mcatanzaro 2023-01-22 14:18:52 -0800 Looks like the shader cache is an ANGLE thing, so *probably* an ANGLE bug, although I'm failing to immediately find the code. But wait, is your username literally "user"? Because the error message says "/home/user". 1927331 2 mcatanzaro 2023-01-22 14:22:00 -0800 OK surprise, this is actually coming from mesa, not from ANGLE. It's in src/util/disk_cache_os.c. 1927332 3 mcatanzaro 2023-01-22 14:32:50 -0800 Oh and I can reproduce: Failed to create /home/mcatanzaro/.var/app/org.gnome.Epiphany.Devel/cache for shader cache (No such file or directory)---disabling. Failed to create /home/mcatanzaro/.var/app/org.gnome.Epiphany.Devel/cache for shader cache (No such file or directory)---disabling. I think it doesn't exist in the flatpak-spawn subsandbox. We don't want to provide access to the real host dirs because that defeats the point of subsandboxing, but I guess we could create empty ones. 1964024 4 mcatanzaro 2023-06-28 06:42:55 -0700 This is https://gitlab.freedesktop.org/mesa/mesa/-/issues/8294