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93 lines
2.3 KiB
Nix
93 lines
2.3 KiB
Nix
{ stdenvNoCC, lib, utillinux, size }:
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/* */ let scope = { "diskImage.makeMBR" =
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let
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inherit (lib) concatMapStringsSep optionalString;
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# List of known mappings of MBR partition types to filesystems.
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types = {
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"FAT32" = "b";
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"ESP" = "ef";
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"ext2" = "83";
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"ext3" = "83";
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"ext4" = "83";
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};
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in
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{
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name
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, partitions
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}:
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let
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_name = name;
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eachPart = partitions: fn: (
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concatMapStringsSep "\n" (partition:
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fn partition
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) partitions);
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in
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stdenvNoCC.mkDerivation rec {
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name = "disk-image-${_name}";
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filename = "${_name}.img";
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img = "${placeholder "out"}/${filename}";
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buildInputs = [ utillinux ];
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buildCommand = ''
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mkdir -p $out
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cat <<EOF > script.sfdisk
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label: dos
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EOF
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# `sfdisk` starts at 1MiB by default, let's use the same default.
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totalSize=${toString (size.MiB 1)}
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echo
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echo "Gathering information about partitions."
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${eachPart partitions (partition: ''
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input_img="${partition}/${partition.filename}"
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start=$totalSize
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size=$(($(du -B 512 --apparent-size "$input_img" | awk '{ print $1 }') * 512))
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totalSize=$(( totalSize + size ))
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echo " -> ${partition.name}: $size / ${partition.filesystemType}"
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(
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# The size is /1024; otherwise it's in sectors.
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echo -n 'start='"$((start/1024))"'KiB'
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echo -n ', size='"$((size/1024))"'KiB'
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echo -n ', type=${types."${partition.filesystemType}"}'
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${optionalString (partition ? bootable && partition.bootable)
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"echo -n ', bootable'"}
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echo "" # Finishes the command
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) >> script.sfdisk
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'')}
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echo
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echo "Making image, $totalSize bytes..."
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truncate -s $totalSize $img
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sfdisk $img < script.sfdisk
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totalSize=${toString (size.MiB 1)}
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echo
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echo "Writing partitions into image"
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${eachPart partitions (partition: ''
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input_img="${partition}/${partition.filename}"
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start=$totalSize
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size=$(($(du -B 512 --apparent-size "$input_img" | awk '{ print $1 }') * 512))
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totalSize=$(( totalSize + size ))
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echo " -> ${partition.name}: $size / ${partition.filesystemType}"
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set -x
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echo "$start / $size"
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dd conv=notrunc if=$input_img of=$img seek=$((start/512)) count=$((size/512)) bs=512
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set +x
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'')}
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ls -lh $img
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'';
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}
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/* */ ;}; in scope."diskImage.makeMBR"
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