104 lines
3.0 KiB
Nix
104 lines
3.0 KiB
Nix
{ pkgs
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, lib
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, # The NixOS configuration to be installed onto the disk image.
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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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, # Whether the disk should be partitioned (with a single partition
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# containing the root filesystem) or contain the root filesystem
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# directly.
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partitioned ? true
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# Whether to invoke switch-to-configuration boot during image creation
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, installBootLoader ? true
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, # The root file system type.
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fsType ? "ext4"
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, # The initial NixOS configuration file to be copied to
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# /etc/nixos/configuration.nix.
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configFile ? null
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, # Shell code executed after the VM has finished.
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postVM ? ""
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, name ? "nixos-disk-image"
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, format ? "raw"
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}:
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with lib;
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pkgs.vmTools.runInLinuxVM (
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pkgs.runCommand name
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{ preVM =
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''
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mkdir $out
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diskImage=$out/nixos.${if format == "qcow2" then "qcow2" else "img"}
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${pkgs.vmTools.qemu}/bin/qemu-img create -f ${format} $diskImage "${toString diskSize}M"
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mv closure xchg/
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'';
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buildInputs = [ pkgs.utillinux pkgs.perl pkgs.e2fsprogs pkgs.parted ];
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exportReferencesGraph =
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[ "closure" config.system.build.toplevel ];
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inherit postVM;
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memSize = 1024;
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}
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''
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${if partitioned then ''
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# Create a single / partition.
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parted /dev/vda mklabel msdos
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parted /dev/vda -- mkpart primary ext2 1M -1s
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. /sys/class/block/vda1/uevent
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mknod /dev/vda1 b $MAJOR $MINOR
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rootDisk=/dev/vda1
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'' else ''
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rootDisk=/dev/vda
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''}
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# Create an empty filesystem and mount it.
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mkfs.${fsType} -L nixos $rootDisk
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${optionalString (fsType == "ext4") ''
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tune2fs -c 0 -i 0 $rootDisk
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''}
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mkdir /mnt
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mount $rootDisk /mnt
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# Register the paths in the Nix database.
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printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \
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${config.nix.package.out}/bin/nix-store --load-db --option build-users-group ""
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# Add missing size/hash fields to the database. FIXME:
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# exportReferencesGraph should provide these directly.
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${config.nix.package.out}/bin/nix-store --verify --check-contents --option build-users-group ""
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# In case the bootloader tries to write to /dev/sda…
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ln -s vda /dev/xvda
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ln -s vda /dev/sda
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# Install the closure onto the image
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USER=root ${config.system.build.nixos-install}/bin/nixos-install \
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--closure ${config.system.build.toplevel} \
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--no-channel-copy \
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--no-root-passwd \
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${optionalString (!installBootLoader) "--no-bootloader"}
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# Install a configuration.nix.
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mkdir -p /mnt/etc/nixos
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${optionalString (configFile != null) ''
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cp ${configFile} /mnt/etc/nixos/configuration.nix
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''}
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# Remove /etc/machine-id so that each machine cloning this image will get its own id
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rm -f /mnt/etc/machine-id
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umount /mnt
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# Do a fsck to make sure resize2fs works.
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fsck.${fsType} -f -y $rootDisk
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''
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)
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