Merge pull request #89331 from Lassulus/make-disk-image
make-disk-image: add hybrid and dynamic sized images
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@ -5,21 +5,32 @@
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config
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, # The size of the disk, in megabytes.
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diskSize
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# if "auto" size is calculated based on the contents copied to it and
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# additionalSpace is taken into account.
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diskSize ? "auto"
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# The files and directories to be placed in the target file system.
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, # additional disk space to be added to the image if diskSize "auto"
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# is used
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additionalSpace ? "512M"
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, # size of the boot partition, is only used if partitionTableType is
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# either "efi" or "hybrid"
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bootSize ? "256M"
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, # The files and directories to be placed in the target file system.
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# This is a list of attribute sets {source, target} where `source'
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# is the file system object (regular file or directory) to be
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# grafted in the file system at path `target'.
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, contents ? []
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contents ? []
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, # Type of partition table to use; either "legacy", "efi", or "none".
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# For "efi" images, the GPT partition table is used and a mandatory ESP
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# partition of reasonable size is created in addition to the root partition.
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# If `installBootLoader` is true, GRUB will be installed in EFI mode.
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# For "legacy", the msdos partition table is used and a single large root
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# partition is created. If `installBootLoader` is true, GRUB will be
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# installed in legacy mode.
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# partition is created.
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# For "hybrid", the GPT partition table is used and a mandatory ESP
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# partition of reasonable size is created in addition to the root partition.
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# Also a legacy MBR will be present.
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# For "none", no partition table is created. Enabling `installBootLoader`
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# most likely fails as GRUB will probably refuse to install.
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partitionTableType ? "legacy"
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@ -43,7 +54,7 @@
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format ? "raw"
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}:
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assert partitionTableType == "legacy" || partitionTableType == "efi" || partitionTableType == "none";
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assert partitionTableType == "legacy" || partitionTableType == "efi" || partitionTableType == "hybrid" || partitionTableType == "none";
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# We use -E offset=X below, which is only supported by e2fsprogs
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assert partitionTableType != "none" -> fsType == "ext4";
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@ -65,6 +76,7 @@ let format' = format; in let
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rootPartition = { # switch-case
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legacy = "1";
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efi = "2";
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hybrid = "3";
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}.${partitionTableType};
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partitionDiskScript = { # switch-case
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@ -76,9 +88,18 @@ let format' = format; in let
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efi = ''
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parted --script $diskImage -- \
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mklabel gpt \
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mkpart ESP fat32 8MiB 256MiB \
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mkpart ESP fat32 8MiB ${bootSize} \
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set 1 boot on \
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mkpart primary ext4 256MiB -1
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mkpart primary ext4 ${bootSize} -1
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'';
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hybrid = ''
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parted --script $diskImage -- \
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mklabel gpt \
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mkpart ESP fat32 8MiB ${bootSize} \
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set 1 boot on \
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mkpart no-fs 0 1024KiB \
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set 2 bios_grub on \
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mkpart primary ext4 ${bootSize} -1
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'';
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none = "";
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}.${partitionTableType};
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@ -129,19 +150,6 @@ let format' = format; in let
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}
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mkdir $out
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diskImage=nixos.raw
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truncate -s ${toString diskSize}M $diskImage
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${partitionDiskScript}
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${if partitionTableType != "none" then ''
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# Get start & length of the root partition in sectors to $START and $SECTORS.
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eval $(partx $diskImage -o START,SECTORS --nr ${rootPartition} --pairs)
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mkfs.${fsType} -F -L ${label} $diskImage -E offset=$(sectorsToBytes $START) $(sectorsToKilobytes $SECTORS)K
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'' else ''
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mkfs.${fsType} -F -L ${label} $diskImage
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''}
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root="$PWD/root"
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mkdir -p $root
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@ -186,6 +194,31 @@ let format' = format; in let
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nixos-install --root $root --no-bootloader --no-root-passwd \
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--system ${config.system.build.toplevel} --channel ${channelSources} --substituters ""
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diskImage=nixos.raw
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${if diskSize == "auto" then ''
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${if partitionTableType == "efi" || partitionTableType == "hybrid" then ''
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additionalSpace=$(( ($(numfmt --from=iec '${additionalSpace}') + $(numfmt --from=iec '${bootSize}')) / 1000 ))
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'' else ''
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additionalSpace=$(( $(numfmt --from=iec '${additionalSpace}') / 1000 ))
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''}
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diskSize=$(( $(set -- $(du -d0 $root); echo "$1") + $additionalSpace ))
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truncate -s "$diskSize"K $diskImage
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'' else ''
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truncate -s ${toString diskSize}M $diskImage
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''}
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${partitionDiskScript}
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${if partitionTableType != "none" then ''
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# Get start & length of the root partition in sectors to $START and $SECTORS.
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eval $(partx $diskImage -o START,SECTORS --nr ${rootPartition} --pairs)
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mkfs.${fsType} -F -L ${label} $diskImage -E offset=$(sectorsToBytes $START) $(sectorsToKilobytes $SECTORS)K
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'' else ''
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mkfs.${fsType} -F -L ${label} $diskImage
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''}
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echo "copying staging root to image..."
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cptofs -p ${optionalString (partitionTableType != "none") "-P ${rootPartition}"} -t ${fsType} -i $diskImage $root/* /
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'';
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@ -219,7 +252,7 @@ in pkgs.vmTools.runInLinuxVM (
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# Create the ESP and mount it. Unlike e2fsprogs, mkfs.vfat doesn't support an
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# '-E offset=X' option, so we can't do this outside the VM.
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${optionalString (partitionTableType == "efi") ''
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${optionalString (partitionTableType == "efi" || partitionTableType == "hybrid") ''
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mkdir -p /mnt/boot
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mkfs.vfat -n ESP /dev/vda1
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mount /dev/vda1 /mnt/boot
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