4e139026b5
This option is helpful for situations when the target host disk's sector size differs from that of the build host.
113 lines
2.7 KiB
Nix
113 lines
2.7 KiB
Nix
# This is an expression meant to be called from `./repart.nix`, it is NOT a
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# NixOS module that can be imported.
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{ lib
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, runCommand
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, python3
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, black
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, ruff
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, mypy
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, systemd
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, fakeroot
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, util-linux
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# filesystem tools
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, dosfstools
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, mtools
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, e2fsprogs
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, squashfsTools
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, erofs-utils
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, btrfs-progs
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, xfsprogs
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# compression tools
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, zstd
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, xz
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# arguments
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, imageFileBasename
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, compression
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, fileSystems
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, partitions
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, split
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, seed
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, definitionsDirectory
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, sectorSize
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}:
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let
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amendRepartDefinitions = runCommand "amend-repart-definitions.py"
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{
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# TODO: ruff does not splice properly in nativeBuildInputs
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depsBuildBuild = [ ruff ];
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nativeBuildInputs = [ python3 black mypy ];
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} ''
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install ${./amend-repart-definitions.py} $out
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patchShebangs --build $out
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black --check --diff $out
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ruff --line-length 88 $out
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mypy --strict $out
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'';
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fileSystemToolMapping = {
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"vfat" = [ dosfstools mtools ];
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"ext4" = [ e2fsprogs.bin ];
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"squashfs" = [ squashfsTools ];
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"erofs" = [ erofs-utils ];
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"btrfs" = [ btrfs-progs ];
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"xfs" = [ xfsprogs ];
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};
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fileSystemTools = builtins.concatMap (f: fileSystemToolMapping."${f}") fileSystems;
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compressionPkg = {
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"zstd" = zstd;
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"xz" = xz;
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}."${compression.algorithm}";
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compressionCommand = {
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"zstd" = "zstd --no-progress --threads=0 -${toString compression.level}";
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"xz" = "xz --keep --verbose --threads=0 -${toString compression.level}";
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}."${compression.algorithm}";
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in
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runCommand imageFileBasename
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{
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nativeBuildInputs = [
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systemd
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fakeroot
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util-linux
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compressionPkg
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] ++ fileSystemTools;
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} ''
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amendedRepartDefinitions=$(${amendRepartDefinitions} ${partitions} ${definitionsDirectory})
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mkdir -p $out
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cd $out
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echo "Building image with systemd-repart..."
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unshare --map-root-user fakeroot systemd-repart \
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--dry-run=no \
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--empty=create \
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--size=auto \
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--seed="${seed}" \
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--definitions="$amendedRepartDefinitions" \
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--split="${lib.boolToString split}" \
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--json=pretty \
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${lib.optionalString (sectorSize != null) "--sector-size=${toString sectorSize}"} \
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${imageFileBasename}.raw \
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| tee repart-output.json
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# Compression is implemented in the same derivation as opposed to in a
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# separate derivation to allow users to save disk space. Disk images are
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# already very space intensive so we want to allow users to mitigate this.
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if ${lib.boolToString compression.enable}; then
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for f in ${imageFileBasename}*; do
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echo "Compressing $f with ${compression.algorithm}..."
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# Keep the original file when compressing and only delete it afterwards
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${compressionCommand} $f && rm $f
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done
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fi
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''
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