propellor/Propellor/Property/Obnam.hs

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module Propellor.Property.Obnam where
import Propellor
import qualified Propellor.Property.Apt as Apt
import qualified Propellor.Property.Cron as Cron
import Utility.SafeCommand
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import Data.List
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type ObnamParam = String
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-- | An obnam repository can be used by multiple clients. Obnam uses
-- locking to allow only one client to write at a time. Since stale lock
-- files can prevent backups from happening, it's more robust, if you know
-- a repository has only one client, to force the lock before starting a
-- backup. Using OnlyClient allows propellor to do so when running obnam.
data NumClients = OnlyClient | MultipleClients
deriving (Eq)
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-- | Installs a cron job that causes a given directory to be backed
-- up, by running obnam with some parameters.
--
-- If the directory does not exist, or exists but is completely empty,
-- this Property will immediately restore it from an existing backup.
--
-- So, this property can be used to deploy a directory of content
-- to a host, while also ensuring any changes made to it get backed up.
-- And since Obnam encrypts, just make this property depend on a gpg
-- key, and tell obnam to use the key, and your data will be backed
-- up securely. For example:
--
-- > & Obnam.backup "/srv/git" "33 3 * * *"
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-- > [ "--repository=sftp://2318@usw-s002.rsync.net/~/mygitrepos.obnam"
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-- > , "--encrypt-with=1B169BE1"
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-- > ] Obnam.OnlyClient
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-- > `requires` Gpg.keyImported "1B169BE1" "root"
-- > `requires` Ssh.keyImported SshRsa "root"
--
-- How awesome is that?
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backup :: FilePath -> Cron.CronTimes -> [ObnamParam] -> NumClients -> Property
backup dir crontimes params numclients = cronjob `describe` desc
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`requires` restored dir params
where
desc = dir ++ " backed up by obnam"
cronjob = Cron.niceJob ("obnam_backup" ++ dir) crontimes "root" "/" $
intercalate ";" $ catMaybes
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[ if numclients == OnlyClient
then Just $ unwords $
[ "obnam"
, "force-lock"
] ++ map shellEscape params
else Nothing
, Just $ unwords $
[ "obnam"
, "backup"
, shellEscape dir
] ++ map shellEscape params
]
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-- | Restores a directory from an obnam backup.
--
-- Only does anything if the directory does not exist, or exists,
-- but is completely empty.
--
-- The restore is performed atomically; restoring to a temp directory
-- and then moving it to the directory.
restored :: FilePath -> [ObnamParam] -> Property
restored dir params = property (dir ++ " restored by obnam") go
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`requires` installed
where
go = ifM (liftIO needsRestore)
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( do
warningMessage $ dir ++ " is empty/missing; restoring from backup ..."
liftIO restore
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, noChange
)
needsRestore = null <$> catchDefaultIO [] (dirContents dir)
restore = withTmpDirIn (takeDirectory dir) "obnam-restore" $ \tmpdir -> do
ok <- boolSystem "obnam" $
[ Param "restore"
, Param "--to"
, Param tmpdir
] ++ map Param params
let restoreddir = tmpdir ++ "/" ++ dir
ifM (pure ok <&&> doesDirectoryExist restoreddir)
( do
void $ tryIO $ removeDirectory dir
renameDirectory restoreddir dir
return MadeChange
, return FailedChange
)
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installed :: Property
installed = Apt.installed ["obnam"]
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-- | Ensures that a recent version of obnam gets installed.
--
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-- Only does anything for Debian Stable.
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latestVersion :: Property
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latestVersion = withOS "obnam latest version" $ \o -> case o of
(Just (System (Debian suite) _)) | isStable suite -> ensureProperty $
Apt.setSourcesListD (sources suite) "obnam"
`requires` toProp (Apt.trustsKey key)
_ -> noChange
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where
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sources suite =
[ "deb http://code.liw.fi/debian " ++ Apt.showSuite suite ++ " main"
]
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-- gpg key used by the code.liw.fi repository.
key = Apt.AptKey "obnam" $ unlines
[ "-----BEGIN PGP PUBLIC KEY BLOCK-----"
, "Version: GnuPG v1.4.9 (GNU/Linux)"
, ""
, "mQGiBEfzuTgRBACcVNG/H6QJqLx5qiQs2zmPe6D6BWOWHfgNgG4IWzNstm21YDxb"
, "KqwFG0gxcnZJGHkXAhkSfqTokYd0lc5eBemcA1pkceNjzMEX8wwiZ810HzJD4eEH"
, "sjoWR8+qKrZeixzZqReAfqztcXoBGKQ0u1R1vpg1txUa75OM4BUqaUbsmwCgmS4x"
, "DjMxSaUSPuu6vQ7ZGZBXSP0D/RQw8DBHMfsv3DiaqFqk8tkuUkpMFPIekHidSHlO"
, "EACbncqbbyHksyCpFNVNcQIDHrOLjOZK9BAXkSd8I3ww7U+nLdDcCblrW8CZnJtm"
, "ZYrxfaXaHZ/It9/RCAsQ+c8xtmyUPjsf//4Vf8olxNQHzgBSe5/LJRi4Vd53he+K"
, "YP4LA/9IZbjvVmm8+8Y0pQrTHlI6nTImtzdBXHc4+T3lLBj9XODHLozC2kSBOQky"
, "q/EisTITHTXL8vYg4NsKm5RTbPAuBwdtxcny8CXfOqKtGOdrebmKotGllTozzdPv"
, "9p53cuce6oJ2oMUodc074JOGTWwDSgLiJX4nViGcU1wy/vtQnrQkY29kZS5saXcu"
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, "BwMCBBUCCAMEFgIDAQIeAQIXgAAKCRBG53tJR95LscKrAJ0ZtKqa2x6Kplwa2mzx"
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, "sa9FgU5Z0f60m9qah6BPXH6IzMLHYoiP7t8rCBIwLgyl3w2w+Fjt1DFpbW9Kb7jz"
, "i8jFvC8jPmxV8xh2OSgVZyNk4qg6hIV8GVQY7AJt8OurZSckgQd7ifHK9JTGohtF"
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, "sksACIWBCo1rvLzrPXsLYOeV3cDDtYAkSwGfuzC1Etbe+qgfIroFTOqdefMw4s8A"
, "AwUH/0KLXm4MS54QQspg3evu4Q4U/E8Hem5/FqB0GhBCitQ4rUsucKyY8/ItpUn5"
, "ismLE60bQqka+Mzd/Zw18TCTzImv0ozAaZ2sNtBado7f6jcC8EDfY5zzK1ukcsAr"
, "Qc5hdLHYuTQW5KpA6fKaW969OUzIwPbdVaCOLOBpxKC6N6iBspQYd6uiQtLw6EUO"
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, "l8kmB5ZrN4WIKhMke1FxbqQC5Q3XATvYRzpzzisZb/HYGNti8W6du5EUwJ0D2NRh"
, "cu+twocOzW0VKfmrDApfifJ9OsSISQQYEQIACQUCR/O5RAIbDAAKCRBG53tJR95L"
, "seQOAJ95KUyzjRjdYgZkDC69Mgu25L86UACdGduINUaRly43ag4kwUXxpqswBBM="
, "=i2c3"
, "-----END PGP PUBLIC KEY BLOCK-----"
]