sdImage: make partition ID/UUID configurable
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parent
99670bbb91
commit
d7bfd04301
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@ -5,6 +5,7 @@
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{ pkgs
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{ pkgs
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, storePaths
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, storePaths
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, volumeLabel
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, volumeLabel
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, uuid ? "44444444-4444-4444-8888-888888888888"
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}:
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}:
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let
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let
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@ -32,7 +33,7 @@ pkgs.stdenv.mkDerivation {
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echo "Creating an EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
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echo "Creating an EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
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truncate -s $bytes $out
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truncate -s $bytes $out
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faketime -f "1970-01-01 00:00:01" mkfs.ext4 -L ${volumeLabel} -U 44444444-4444-4444-8888-888888888888 $out
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faketime -f "1970-01-01 00:00:01" mkfs.ext4 -L ${volumeLabel} -U ${uuid} $out
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# Populate the image contents by piping a bunch of commands to the `debugfs` tool from e2fsprogs.
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# Populate the image contents by piping a bunch of commands to the `debugfs` tool from e2fsprogs.
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# For example, to copy /nix/store/abcd...efg-coreutils-8.23/bin/sleep:
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# For example, to copy /nix/store/abcd...efg-coreutils-8.23/bin/sleep:
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@ -16,6 +16,8 @@ let
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inherit pkgs;
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inherit pkgs;
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inherit (config.sdImage) storePaths;
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inherit (config.sdImage) storePaths;
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volumeLabel = "NIXOS_SD";
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volumeLabel = "NIXOS_SD";
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} // optionalAttrs (config.sdImage.rootPartitionUUID != null) {
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uuid = config.sdImage.rootPartitionUUID;
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};
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};
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in
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in
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{
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{
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@ -42,6 +44,24 @@ in
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'';
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'';
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};
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};
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bootPartitionID = mkOption {
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type = types.string;
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default = "0x2178694e";
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description = ''
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Volume ID for the /boot partition on the SD card. This value must be a
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32-bit hexadecimal number.
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'';
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};
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rootPartitionUUID = mkOption {
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type = types.nullOr types.string;
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default = null;
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example = "14e19a7b-0ae0-484d-9d54-43bd6fdc20c7";
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description = ''
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UUID for the main NixOS partition on the SD card.
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'';
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};
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bootSize = mkOption {
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bootSize = mkOption {
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type = types.int;
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type = types.int;
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default = 120;
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default = 120;
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@ -95,7 +115,7 @@ in
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# type=b is 'W95 FAT32', type=83 is 'Linux'.
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# type=b is 'W95 FAT32', type=83 is 'Linux'.
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sfdisk $img <<EOF
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sfdisk $img <<EOF
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label: dos
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label: dos
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label-id: 0x2178694e
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label-id: ${config.sdImage.bootPartitionID}
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start=8M, size=$bootSizeBlocks, type=b, bootable
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start=8M, size=$bootSizeBlocks, type=b, bootable
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start=${toString (8 + config.sdImage.bootSize)}M, type=83
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start=${toString (8 + config.sdImage.bootSize)}M, type=83
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@ -108,7 +128,7 @@ in
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# Create a FAT32 /boot partition of suitable size into bootpart.img
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# Create a FAT32 /boot partition of suitable size into bootpart.img
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eval $(partx $img -o START,SECTORS --nr 1 --pairs)
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eval $(partx $img -o START,SECTORS --nr 1 --pairs)
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truncate -s $((SECTORS * 512)) bootpart.img
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truncate -s $((SECTORS * 512)) bootpart.img
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faketime "1970-01-01 00:00:00" mkfs.vfat -i 0x2178694e -n NIXOS_BOOT bootpart.img
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faketime "1970-01-01 00:00:00" mkfs.vfat -i ${config.sdImage.bootPartitionID} -n NIXOS_BOOT bootpart.img
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# Populate the files intended for /boot
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# Populate the files intended for /boot
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mkdir boot
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mkdir boot
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