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56226c4674
Makes it easier to enable discarding of references, a feature of Nix 2.14 which requires structured attrs.
36 lines
1.1 KiB
Nix
36 lines
1.1 KiB
Nix
{ stdenv, squashfsTools, closureInfo
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, # The root directory of the squashfs filesystem is filled with the
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# closures of the Nix store paths listed here.
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storeContents ? []
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, # Compression parameters.
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# For zstd compression you can use "zstd -Xcompression-level 6".
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comp ? "xz -Xdict-size 100%"
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}:
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stdenv.mkDerivation {
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name = "squashfs.img";
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__structuredAttrs = true;
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nativeBuildInputs = [ squashfsTools ];
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buildCommand =
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''
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closureInfo=${closureInfo { rootPaths = storeContents; }}
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# Also include a manifest of the closures in a format suitable
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# for nix-store --load-db.
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cp $closureInfo/registration nix-path-registration
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# 64 cores on i686 does not work
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# fails with FATAL ERROR: mangle2:: xz compress failed with error code 5
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if ((NIX_BUILD_CORES > 48)); then
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NIX_BUILD_CORES=48
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fi
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# Generate the squashfs image.
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mksquashfs nix-path-registration $(cat $closureInfo/store-paths) $out \
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-no-hardlinks -keep-as-directory -all-root -b 1048576 -comp ${comp} \
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-processors $NIX_BUILD_CORES
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'';
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}
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