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Build the same enclave image on every machine #7

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Merged
aruokhai merged 1 commit into from
Oct 15, 2026
Merged

Build the same enclave image on every machine #7

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4 changes: 3 additions & 1 deletion nix/eif.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -150,7 +150,9 @@ stdenvNoCC.mkDerivation {
# people compare artifacts by hashing them, and because it lets
# `nix build --rebuild` be a check that passes rather than a known
# exception.
faketime -f '@1970-01-01 00:00:01' \
# No `@`: with one, faketime starts the clock there and lets it run, and the nanoseconds it
# had run for by the time eif_build read it still differed between builds.
faketime -f '1970-01-01 00:00:01' \
eif_build \
--kernel ${kernel}/bzImage \
--kernel_config ${kernel}/bzImage.config \
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10 changes: 9 additions & 1 deletion nix/kernel-zfs.nix
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Expand Up @@ -78,7 +78,15 @@ let
extraMakeFlags = [ "KBUILD_BUILD_USER=nixbuild" "KBUILD_BUILD_HOST=nixbuilder" ];
};

zfsKmod = (linuxPackagesFor kernel).${zfs.kernelModuleAttribute};
# ZFS's assertions carry __FILE__, so its modules record where they were compiled: /build/source
# in a sandboxed Nix, a temporary directory in one without a sandbox. The image held them, and
# the same commit measured to two PCR0s. Mapped to the sandbox's path, every builder produces
# the modules a sandboxed one always did.
zfsKmod = ((linuxPackagesFor kernel).${zfs.kernelModuleAttribute}).overrideAttrs (old: {
preBuild = (old.preBuild or "") + ''
export KCFLAGS="''${KCFLAGS:-} -ffile-prefix-map=$NIX_BUILD_TOP=/build"
'';
});
in
assert zfsKmod.version == zfs.version;
{
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