{-# LANGUAGE FlexibleContexts #-} module Propellor.Property.DiskImage ( built, rebuilt, MountPoint, MkPartTable, fitChrootSize, freeSpace, DiskImageFinalization, grubBooted, Grub.BIOS(..), ) where import Propellor import Propellor.Property.Chroot import Propellor.Property.Parted import qualified Propellor.Property.Grub as Grub -- | Creates a bootable disk image. -- -- First the specified Chroot is set up, and its properties are satisfied. -- -- Then, the disk image is set up, and the chroot is copied into the -- appropriate partition(s) of it. -- -- Finally, the DiskImageFinalization property is -- satisfied to make the disk image bootable. -- -- > let chroot d = Chroot.debootstrapped (System (Debian Unstable) "amd64") mempty d -- > & Apt.installed ["openssh-server"] -- > & ... -- > partitions = fitChrootSize MSDOS -- > [ (Just "/boot", mkPartiton EXT2) -- > , (Just "/", mkPartition EXT4) -- > , (Nothing, const (mkPartition LinuxSwap (MegaBytes 256))) -- > ] -- > in built chroot partitions (grubBooted PC) built :: (FilePath -> Chroot) -> MkPartTable -> DiskImageFinalization -> RevertableProperty built = built' False -- | Like 'built', but the chroot is deleted and rebuilt from scratch each -- time. This is more expensive, but useful to ensure reproducible results -- when the properties of the chroot have been changed. rebuilt :: (FilePath -> Chroot) -> MkPartTable -> DiskImageFinalization -> RevertableProperty rebuilt = built' True built' :: Bool -> (FilePath -> Chroot) -> MkPartTable -> DiskImageFinalization -> RevertableProperty built' rebuild mkparttable mkchroot final = undefined -- | Where a partition is mounted. Use Nothing for eg, LinuxSwap. type MountPoint = Maybe FilePath -- | This is provided with a list of the sizes of directories in the chroot -- under each mount point. The input list corresponds to the list of mount -- points that the function returns! This trick is accomplished by -- exploiting laziness and tying the knot. -- -- (Partitions that are not mounted (ie, LinuxSwap) will have 128 MegaBytes -- provides as a default size.) type MkPartTable = [MegaBytes] -> ([MountPoint], PartTable) -- TODO tie the knot -- let f = fitChrootSize MSDOS [(Just "/", mkPartition EXT2)] -- let (mnts, t) = f (map (MegaBytes . fromIntegral . length . show) mnts) -- | The constructor for each Partition is passed the size of the files -- from the chroot that will be put in that partition. -- -- Partitions that are not mounted (ie, LinuxSwap) will have their size -- set to 128 MegaBytes, unless it's overridden. fitChrootSize :: TableType -> [(MountPoint, MegaBytes -> Partition)] -> MkPartTable fitChrootSize tt l basesizes = (mounts, parttable) where (mounts, sizers) = unzip l parttable = PartTable tt (map (uncurry id) (zip sizers basesizes)) -- | After populating the partitions with files from the chroot, -- they will have remaining free space equal to the sizes of the input -- partitions. freeSpace :: TableType -> [(MountPoint, Partition)] -> MkPartTable freeSpace tt = fitChrootSize tt . map (\(mnt, p) -> (mnt, adjustsz p)) where adjustsz p basesize = p { partSize = partSize p <> basesize } -- | A pair of properties. The first property is satisfied within the -- chroot, and is typically used to download the boot loader. -- The second property is satisfied chrooted into the resulting -- disk image, and will typically take care of installing the boot loader -- to the disk image. type DiskImageFinalization = (Property NoInfo, Property NoInfo) -- | Makes grub be the boot loader of the disk image. grubBooted :: Grub.BIOS -> DiskImageFinalization grubBooted bios = (Grub.installed bios, undefined)