mirror of
https://github.com/NixOS/nixpkgs.git
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156 lines
4.9 KiB
Nix
156 lines
4.9 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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# 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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, # 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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# This prevents errors while checking nix-store validity, see
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# https://github.com/NixOS/nix/issues/1134
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, fixValidity ? true
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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 = with pkgs; [ utillinux perl e2fsprogs parted rsync ];
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# I'm preserving the line below because I'm going to search for it across nixpkgs to consolidate
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# image building logic. The comment right below this now appears in 4 different places in nixpkgs :)
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# !!! should use XML.
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sources = map (x: x.source) contents;
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targets = map (x: x.target) contents;
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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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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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${if fixValidity then ''
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# Add missing size/hash fields to the database. FIXME:
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# exportReferencesGraph should provide these directly.
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${config.nix.package.out}/bin/nix-store --verify --check-contents --option build-users-group ""
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'' else ""}
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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 ${configFile} /mnt/etc/nixos/configuration.nix
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''}
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# Remove /etc/machine-id so that each machine cloning this image will get its own id
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rm -f /mnt/etc/machine-id
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# Copy arbitrary other files into the image
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# Semi-shamelessly copied from make-etc.sh. I (@copumpkin) shall factor this stuff out as part of
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# https://github.com/NixOS/nixpkgs/issues/23052.
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set -f
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sources_=($sources)
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targets_=($targets)
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set +f
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for ((i = 0; i < ''${#targets_[@]}; i++)); do
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source="''${sources_[$i]}"
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target="''${targets_[$i]}"
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if [[ "$source" =~ '*' ]]; then
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# If the source name contains '*', perform globbing.
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mkdir -p /mnt/$target
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for fn in $source; do
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rsync -a --no-o --no-g "$fn" /mnt/$target/
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done
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else
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mkdir -p /mnt/$(dirname $target)
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if ! [ -e /mnt/$target ]; then
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rsync -a --no-o --no-g $source /mnt/$target
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else
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echo "duplicate entry $target -> $source"
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exit 1
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fi
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fi
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done
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umount /mnt
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# Make sure resize2fs works. Note that resize2fs has stricter criteria for resizing than a normal
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# mount, so the `-c 0` and `-i 0` don't affect it. Setting it to `now` doesn't produce deterministic
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# output, of course, but we can fix that when/if we start making images deterministic.
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${optionalString (fsType == "ext4") ''
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tune2fs -T now -c 0 -i 0 $rootDisk
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''}
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''
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)
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