125 lines
4.3 KiB
Haskell
125 lines
4.3 KiB
Haskell
module Propellor.Property.OS (
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cleanInstallOnce,
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Confirmed(..),
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fixupNetworkInterfaces,
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rootSshAuthorized,
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grubBoots,
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GrubDev(..),
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kernelInstalled,
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oldOSRemoved,
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) where
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import Propellor
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import qualified Propellor.Property.Chroot as Chroot
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import qualified Propellor.Property.Debootstrap as Debootstrap
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import qualified Propellor.Property.File as File
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import qualified Propellor.Property.Ssh as Ssh
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import Utility.FileMode
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-- | Replaces whatever OS was installed before with a clean installation
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-- of the OS that the Host is configured to have.
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--
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-- This can replace one Linux distribution with different one.
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-- But, it can also fail and leave the system in an unbootable state.
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--
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-- To avoid this property being accidentially used, you have to provide
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-- a Confirmed containing the name of the host that you intend to apply the
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-- property to.
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--
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-- This property only runs once. The cleanly installed system will have
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-- a file /etc/propellor-cleaninstall, which indicates it was cleanly
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-- installed.
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--
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-- You will typically want to run some more properties after the clean
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-- install, to bootstrap from the cleanly installed system to a fully
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-- working system. For example:
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--
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-- > & os (System (Debian Unstable) "amd64")
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-- > & cleanInstall (Confirmed "foo.example.com") [BackupOldOS, UseOldKernel]
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-- > `onChange` propertyList "fixing up after clean install"
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-- > [ fixupNetworkInterfaces
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-- > , rootSshAuthorized
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-- > -- , kernelInstalled
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-- > -- , grubBoots "hd0"
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-- > ]
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-- > & Apt.installed ["ssh"]
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-- > & User.hasSomePassword "root"
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-- > & User.accountFor "joey"
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-- > & User.hasSomePassword "joey"
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-- > -- rest of system properties here
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cleanInstallOnce :: Confirmed -> [Tweak] -> Property
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cleanInstallOnce confirmed tweaks = check (not <$> doesFileExist flagfile) $
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property "OS cleanly installed" $ do
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checkConfirmed confirmed
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error "TODO"
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-- debootstrap /new-os chroot, but don't run propellor
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-- inside the chroot.
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-- unmount all mounts
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-- move all directories to /old-os,
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-- except for /boot and /lib/modules when UseOldKernel
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-- (or, delete when not BackupOldOS)
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-- move /new-os to /
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-- touch flagfile
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-- re-bootstrap propellor in /usr/local/propellor,
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-- (using git repo bundle, privdata file, and possibly
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-- git repo url, which all need to be arranged to
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-- be present in /old-os's /usr/local/propellor)
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-- enable shadow passwords (to avoid foot-shooting)
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-- return MadeChange
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where
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flagfile = "/etc/propellor-cleaninstall"
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data Confirmed = Confirmed HostName
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checkConfirmed :: Confirmed -> Propellor ()
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checkConfirmed (Confirmed c) = do
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hostname <- asks hostName
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when (hostname /= c) $
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errorMessage "Run with a bad confirmation, not matching hostname."
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-- | Sometimes you want an almost clean install, but with some tweaks.
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data Tweak
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= UseOldKernel -- ^ Leave /boot and /lib/modules from old OS, so the system can boot using them as before
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| BackupOldOS -- ^ Back up old OS to /old-os, to avoid losing any important files
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-- /etc/network/interfaces is configured to bring up all interfaces that
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-- are currently up, using the same IP addresses.
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fixupNetworkInterfaces :: Property
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fixupNetworkInterfaces = undefined
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-- Root's .ssh/authorized_keys has added to it any ssh keys that
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-- were authorized in the old OS. Any other contents of the file are
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-- retained.
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rootSshAuthorized :: Property
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rootSshAuthorized = check (doesDirectoryExist oldloc) $
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property (newloc ++ " copied from old OS") $ do
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ks <- liftIO $ lines <$> readFile oldloc
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ensureProperties (map (Ssh.authorizedKey "root") ks)
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where
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newloc = "/root/.ssh/authorized_keys"
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oldloc = oldOsDir ++ newloc
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-- Installs an appropriate kernel from the OS distribution.
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kernelInstalled :: Property
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kernelInstalled = undefined
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-- Installs grub onto a device to boot the system.
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--
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-- You may want to install grub to multiple devices; eg for a system
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-- that uses software RAID.
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grubBoots :: GrubDev -> Property
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grubBoots = undefined
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type GrubDev = String
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-- Removes the old OS's backup from /old-os
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oldOSRemoved :: Confirmed -> Property
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oldOSRemoved confirmed = check (doesDirectoryExist oldOsDir) $
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property "old OS backup removed" $ do
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checkConfirmed confirmed
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liftIO $ removeDirectoryRecursive oldOsDir
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return MadeChange
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oldOsDir :: FilePath
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oldOsDir = "/old-os"
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