nixpkgs/nixos/lib/make-squashfs.nix
Artturin eea6baad50 make-squashfs: use $NIX_BUILD_CORES or 48 cores if above 48
by default all cores are used

hoping this will fix the hydra i686 squashfs build issues as all the
failures were using 64 cores

Parallel mksquashfs: Using 64 processors
Creating 4.0 filesystem on ..., block size 1048576.
FATAL ERROR: mangle2:: xz compress failed with error code 5
2021-12-08 19:23:31 +02:00

36 lines
1.1 KiB
Nix

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