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gpu driver linking fix

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gregor
2026-09-07 23:45:44 +02:00
parent 6eb796494a
commit 48b5bc7123
4 changed files with 71 additions and 15 deletions
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flake.nix
+66 -11
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@@ -65,19 +65,73 @@
vulkan-loader
]
);
# wgpu dlopens the Vulkan loader and libEGL by soname, and those in turn
# dlopen the GPU vendor driver named in the ICD/vendor JSON. Nixpkgs' own
# store paths cover the loaders but never the driver, which lives outside
# /nix/store: under /run/opengl-driver on NixOS, under the distro's library
# directory everywhere else. Without these the loader finds zero drivers and
# wgpu reports "Failed to create surface for any enabled backend: {}".
# They go last so /nix/store still wins for everything else.
driverLibraries = [
"/run/opengl-driver/lib"
# wgpu dlopens the Vulkan loader and libEGL, which in turn dlopen the GPU
# vendor driver named in the ICD / EGL vendor JSON. Nixpkgs supplies the
# loaders but never the driver: that lives outside /nix/store, under
# /run/opengl-driver on NixOS and in the distro's library directory
# everywhere else. With no driver reachable the loaders enumerate nothing
# and wgpu fails with "Failed to create surface for any enabled backend: {}".
#
# The host directories cannot simply go on LD_LIBRARY_PATH: it outranks the
# binary's DT_RUNPATH, so the host's libc.so.6 / libgcc_s.so.1 would load
# into a process linked against the store's glibc and segfault on startup.
# Instead, link only the vendor driver objects into a private directory and
# expose that. Their remaining dependencies (libc, libX11, ...) then resolve
# against the already-loaded store libraries.
hostDriverGlobs = [
"libGLX_*.so*" # GLX vendor drivers (glvnd dispatch stays from the store)
"libEGL_*.so*"
"libGLESv1_CM_*.so*"
"libGLESv2_*.so*"
"libnvidia-*.so*"
"libcuda.so*"
"libvulkan_*.so*" # mesa's radv / anv, not the loader itself
"libgallium*.so*"
"*_dri.so"
"libdrm*.so*"
];
hostLibraryDirs = [
"/usr/lib/${pkgs.stdenv.hostPlatform.parsed.cpu.name}-linux-gnu"
"/usr/lib64"
"/usr/lib"
];
# Runs inside the wrapper, before exec.
collectHostDrivers = ''
if [ -d /run/opengl-driver/lib ]; then
export LD_LIBRARY_PATH="''${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}/run/opengl-driver/lib"
elif [ -z "''${SLERM_NO_HOST_DRIVERS:-}" ]; then
slermCache="''${XDG_CACHE_HOME:-$HOME/.cache}/slerm/gpu-drivers"
slermStale=1
if [ -e "$slermCache/.stamp" ]; then
slermStale=0
for slermDir in ${lib.concatStringsSep " " hostLibraryDirs}; do
if [ -d "$slermDir" ] && [ "$slermDir" -nt "$slermCache/.stamp" ]; then
slermStale=1
fi
done
fi
if [ "$slermStale" = 1 ]; then
slermTmp="$slermCache.$$"
rm -rf "$slermTmp" && mkdir -p "$slermTmp" || slermTmp=""
for slermDir in ${lib.concatStringsSep " " hostLibraryDirs}; do
[ -n "$slermTmp" ] && [ -d "$slermDir" ] || continue
for slermGlob in ${lib.concatStringsSep " " hostDriverGlobs}; do
for slermLib in "$slermDir"/$slermGlob; do
[ -e "$slermLib" ] || continue
ln -sfn "$slermLib" "$slermTmp/''${slermLib##*/}"
done
done
done
if [ -n "$slermTmp" ]; then
: > "$slermTmp/.stamp"
rm -rf "$slermCache" && mv "$slermTmp" "$slermCache" || rm -rf "$slermTmp"
fi
fi
[ -d "$slermCache" ] &&
export LD_LIBRARY_PATH="''${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$slermCache"
unset slermCache slermStale slermTmp slermDir slermGlob slermLib
fi
'';
ghosttyEnv = {
GHOSTTY_SOURCE_DIR = "${ghostty-src}";
GHOSTTY_ZIG_SYSTEM_DIR = "${ghosttyDeps}";
@@ -130,7 +184,7 @@
postFixup = lib.optionalString pkgs.stdenv.hostPlatform.isLinux ''
wrapProgram "$out/bin/slerm" \
--suffix LD_LIBRARY_PATH : ${lib.makeLibraryPath runtimeLibraries} \
--suffix LD_LIBRARY_PATH : ${lib.concatStringsSep ":" driverLibraries}
--run ${lib.escapeShellArg collectHostDrivers}
'';
meta = {
@@ -161,7 +215,8 @@
shellHook = ''
export ZIG_GLOBAL_CACHE_DIR="$PWD/target/zig-global-cache"
${lib.optionalString pkgs.stdenv.hostPlatform.isLinux ''
export LD_LIBRARY_PATH="${lib.makeLibraryPath runtimeLibraries}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}:${lib.concatStringsSep ":" driverLibraries}"
export LD_LIBRARY_PATH="${lib.makeLibraryPath runtimeLibraries}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
${collectHostDrivers}
''}
'';
}