Nix derivations: libghostty, cmux-linux, socket-test-suite VM#135

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Jesssullivan wants to merge 26 commits intomainfrom

sid/nix-vm-tests

Commits on Mar 31, 2026

feat(nix): add socket-test-suite NixOS VM check (Tier 4)
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feat(nix): package libghostty + cmux-linux as Nix derivations
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fix(nix): add glibc.dev + CC env for Zig libc header resolution in sandbox
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fix(nix): use zigBuildFlags pattern from ghostty/nix/package.nix
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fix(nix): use ghosttySrc directly as src (flake input is already a store path)
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fix(nix): use manual buildPhase (zig overlay lacks stdenv hook), dontInstall
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fix(nix): add pandoc, set NIX_CFLAGS for glibc headers in Zig sandbox
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fix(nix): use -Dtarget=native-native-gnu to force glibc over musl
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fix(nix): add autoPatchelfHook + LD_LIBRARY_PATH for framegen runtime
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fix(nix): shim bits/alltypes.h instead of -Dtarget=native-native-gnu
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fix(nix): use --libc config + /lib64 symlink for Zig gnu target in sandbox
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fix(nix): use -Dsimd=false to skip C++ deps causing musl/glibc conflict
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fix(nix): use -fsys=spirv-cross,glslang to avoid all C++ compilation in sandbox
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fix(nix): use __noChroot for libghostty (Zig build-time binaries need /lib64)
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fix(nix): wrap zig to patchelf build-time binaries for Nix dynamic linker
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fix(nix): document Zig sandbox dynamic linker limitation
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fix(nix): align libghostty derivation with upstream ghostty pattern
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fix(nix): resolve infinite recursion in flake check by removing overlay from VM apps
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fix(nix): use explicit buildPhase for cmux-linux (avoid cd + zig hook interaction)
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fix(nix): use explicit buildPhase for libghostty (zig overlay lacks hook)
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fix(nix): restore -fsys and -Dsimd=false flags for libghostty
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fix(nix): add __noChroot for libghostty (Zig dynamic linker blocker)
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ci(fork): set sandbox = relaxed for __noChroot libghostty build
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fix(nix): add __noChroot for cmux-linux (same Zig dynamic linker issue)
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fix(nix): fix cmux-linux install path (relative to cd'd working dir)
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ci(linux): set sandbox = relaxed for __noChroot libghostty build
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