Merge branch 'joeyconfig' of ssh://propellor.branchable.com into joeyconfig

1 files changed, 111 insertions, 0 deletions

diff --git a/src/Propellor/Property/Bootstrap.hs b/src/Propellor/Property/Bootstrap.hs
new file mode 100644
index 00000000..5678a865
--- /dev/null
+++ b/src/Propellor/Property/Bootstrap.hs
@@ -0,0 +1,111 @@
+module Propellor.Property.Bootstrap (RepoSource(..), bootstrappedFrom, clonedFrom) where
+
+import Propellor.Base
+import Propellor.Bootstrap
+import Propellor.Property.Chroot
+
+import Data.List
+import qualified Data.ByteString as B
+
+-- | Where a propellor repository should be bootstrapped from.
+data RepoSource
+	= GitRepoUrl String
+	| GitRepoOutsideChroot
+	-- ^ When used in a chroot, this copies the git repository from
+	-- outside the chroot, including its configuration.
+
+-- | Bootstraps a propellor installation into
+-- /usr/local/propellor/
+--
+-- Normally, propellor is already bootstrapped when it runs, so this
+-- property is not useful. However, this can be useful inside a
+-- chroot used to build a disk image, to make the disk image
+-- have propellor installed.
+--
+-- The git repository is cloned (or pulled to update if it already exists).
+--
+-- All build dependencies are installed, using distribution packages
+-- or falling back to using cabal.
+bootstrappedFrom :: RepoSource -> Property Linux
+bootstrappedFrom reposource = go `requires` clonedFrom reposource
+  where
+	go :: Property Linux
+	go = property "Propellor bootstrapped" $ do
+		system <- getOS
+		assumeChange $ exposeTrueLocaldir $ const $ 
+			runShellCommand $ buildShellCommand
+				[ "cd " ++ localdir
+				, bootstrapPropellorCommand system
+				]
+
+-- | Clones the propellor repeository into /usr/local/propellor/
+--
+-- If the propellor repo has already been cloned, pulls to get it
+-- up-to-date.
+clonedFrom :: RepoSource -> Property Linux
+clonedFrom reposource = case reposource of
+	GitRepoOutsideChroot -> go `onChange` copygitconfig
+	_ -> go
+  where
+	go :: Property Linux
+	go = property ("Propellor repo cloned from " ++ sourcedesc) $
+		ifM needclone (makeclone, updateclone)
+	
+	makeclone = do
+		let tmpclone = localdir ++ ".tmpclone"
+		system <- getOS
+		assumeChange $ exposeTrueLocaldir $ \sysdir -> do
+			let originloc = case reposource of
+				GitRepoUrl s -> s
+				GitRepoOutsideChroot -> sysdir
+			runShellCommand $ buildShellCommand
+				[ installGitCommand system
+				, "rm -rf " ++ tmpclone
+				, "git clone " ++ shellEscape originloc ++ " " ++ tmpclone
+				, "mkdir -p " ++ localdir
+				-- This is done rather than deleting
+				-- the old localdir, because if it is bound
+				-- mounted from outside the chroot, deleting
+				-- it after unmounting in unshare will remove
+				-- the bind mount outside the unshare.
+				, "(cd " ++ tmpclone ++ " && tar c .) | (cd " ++ localdir ++ " && tar x)"
+				, "rm -rf " ++ tmpclone
+				]
+	
+	updateclone = assumeChange $ exposeTrueLocaldir $ const $
+		runShellCommand $ buildShellCommand
+			[ "cd " ++ localdir
+			, "git pull"
+			]
+	
+	-- Copy the git config of the repo outside the chroot into the
+	-- chroot. This way it has the same remote urls, and other git
+	-- configuration.
+	copygitconfig :: Property Linux
+	copygitconfig = property ("Propellor repo git config copied from outside the chroot") $ do
+		let gitconfig = localdir <> ".git" <> "config"
+		cfg <- liftIO $ B.readFile gitconfig
+		exposeTrueLocaldir $ const $
+			liftIO $ B.writeFile gitconfig cfg
+		return MadeChange
+
+	needclone = (inChroot <&&> truelocaldirisempty)
+		<||> (liftIO (not <$> doesDirectoryExist localdir))
+	
+	truelocaldirisempty = exposeTrueLocaldir $ const $
+		runShellCommand ("test ! -d " ++ localdir ++ "/.git")
+
+	sourcedesc = case reposource of
+		GitRepoUrl s -> s
+		GitRepoOutsideChroot -> localdir ++ " outside the chroot"
+
+assumeChange :: Propellor Bool -> Propellor Result
+assumeChange a = do
+	ok <- a
+	return (cmdResult ok <> MadeChange)
+
+buildShellCommand :: [String] -> String
+buildShellCommand = intercalate "&&" . map (\c -> "(" ++ c ++ ")")
+
+runShellCommand :: String -> Propellor Bool
+runShellCommand s = liftIO $ boolSystem "sh" [ Param "-c", Param s]