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author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2015-09-27 21:01:43 +0200 |
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committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2015-09-27 21:06:40 +0200 |
commit | aeb31b97ad055e3bab6660ca9713e406915c6ea7 (patch) | |
tree | 8289296415eafc55171db75017f9bbe9833147ab /nixos/lib/make-disk-image.nix | |
parent | efed00b55ed5c958ef4f9db699bbe80fb6d4f251 (diff) | |
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Update AMI generator
The EBS and S3 (instance-store) AMIs are now created from the same image. HVM instance-store AMIs are also generated. Disk image generation has been factored out into a function (nixos/lib/make-disk-image.nix) that can be used to build other kinds of images.
Diffstat (limited to 'nixos/lib/make-disk-image.nix')
-rw-r--r-- | nixos/lib/make-disk-image.nix | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/nixos/lib/make-disk-image.nix b/nixos/lib/make-disk-image.nix new file mode 100644 index 00000000000..386d88a5b35 --- /dev/null +++ b/nixos/lib/make-disk-image.nix @@ -0,0 +1,105 @@ +{ pkgs +, lib + +, # The NixOS configuration to be installed onto the disk image. + config + +, # The size of the disk, in megabytes. + diskSize + +, # Whether the disk should be partitioned (with a single partition + # containing the root filesystem) or contain the root filesystem + # directly. + partitioned ? true + +, # The root file system type. + fsType ? "ext4" + +, # The initial NixOS configuration file to be copied to + # /etc/nixos/configuration.nix. + configFile ? null + +}: + +with lib; + +pkgs.vmTools.runInLinuxVM ( + pkgs.runCommand "nixos-disk-image" + { preVM = + '' + mkdir $out + diskImage=$out/nixos.img + ${pkgs.vmTools.qemu}/bin/qemu-img create -f raw $diskImage "${toString diskSize}M" + mv closure xchg/ + ''; + buildInputs = [ pkgs.utillinux pkgs.perl pkgs.e2fsprogs pkgs.parted ]; + exportReferencesGraph = + [ "closure" config.system.build.toplevel ]; + } + '' + ${if partitioned then '' + # Create a single / partition. + parted /dev/vda mklabel msdos + parted /dev/vda -- mkpart primary ext2 1M -1s + . /sys/class/block/vda1/uevent + mknod /dev/vda1 b $MAJOR $MINOR + rootDisk=/dev/vda1 + '' else '' + rootDisk=/dev/vda + ''} + + # Create an empty filesystem and mount it. + mkfs.${fsType} -L nixos $rootDisk + ${optionalString (fsType == "ext4") '' + tune2fs -c 0 -i 0 $rootDisk + ''} + mkdir /mnt + mount $rootDisk /mnt + + # The initrd expects these directories to exist. + mkdir /mnt/dev /mnt/proc /mnt/sys + + mount -o bind /proc /mnt/proc + mount -o bind /dev /mnt/dev + mount -o bind /sys /mnt/sys + + # Copy all paths in the closure to the filesystem. + storePaths=$(perl ${pkgs.pathsFromGraph} /tmp/xchg/closure) + + mkdir -p /mnt/nix/store + echo "copying everything (will take a while)..." + cp -prd $storePaths /mnt/nix/store/ + + # Register the paths in the Nix database. + printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \ + chroot /mnt ${config.nix.package}/bin/nix-store --load-db --option build-users-group "" + + # Create the system profile to allow nixos-rebuild to work. + chroot /mnt ${config.nix.package}/bin/nix-env --option build-users-group "" \ + -p /nix/var/nix/profiles/system --set ${config.system.build.toplevel} + + # `nixos-rebuild' requires an /etc/NIXOS. + mkdir -p /mnt/etc + touch /mnt/etc/NIXOS + + # `switch-to-configuration' requires a /bin/sh + mkdir -p /mnt/bin + ln -s ${config.system.build.binsh}/bin/sh /mnt/bin/sh + + # Install a configuration.nix. + mkdir -p /mnt/etc/nixos + ${optionalString (configFile != null) '' + cp ${configFile} /mnt/etc/nixos/configuration.nix + ''} + + # Generate the GRUB menu. + ln -s vda /dev/xvda + chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot + + umount /mnt/proc /mnt/dev /mnt/sys + umount /mnt + + # Do an fsck to make sure resize2fs works. + fsck.${fsType} -f -y $rootDisk + '' +) |