Add uninit subcommand. Closes: #605749

6 files changed, 100 insertions, 15 deletions

diff --git a/CmdLine.hs b/CmdLine.hs
index 837420786..0903cc1fb 100644
--- a/CmdLine.hs
+++ b/CmdLine.hs
@@ -32,6 +32,7 @@ import qualified Command.Unlock
 import qualified Command.Lock
 import qualified Command.PreCommit
 import qualified Command.Find
+import qualified Command.Uninit
 
 subCmds :: [SubCommand]
 subCmds =
@@ -55,6 +56,8 @@ subCmds =
 		"initialize git-annex with repository description"
 	, SubCommand "unannex" path	Command.Unannex.seek
 		"undo accidential add command"
+	, SubCommand "uninit" path	Command.Uninit.seek
+		"de-initialize git-annex and clean out repository"
 	, SubCommand "pre-commit" path	Command.PreCommit.seek
 		"run by git pre-commit hook"
 	, SubCommand "fromkey" key	Command.FromKey.seek
diff --git a/Command/Init.hs b/Command/Init.hs
index eb5c58696..e19849ba3 100644
--- a/Command/Init.hs
+++ b/Command/Init.hs
@@ -18,6 +18,7 @@ import UUID
 import Version
 import Messages
 import Locations
+import Types
 
 seek :: [SubCmdSeek]
 seek = [withString start]
@@ -36,8 +37,8 @@ perform description = do
 	u <- getUUID g
 	describeUUID u description
 	setVersion
-	liftIO $ gitAttributes g
-	liftIO $ gitPreCommitHook g
+	liftIO $ gitAttributesWrite g
+	gitPreCommitHookWrite g
 	return $ Just cleanup
 
 cleanup :: SubCmdCleanup
@@ -50,8 +51,8 @@ cleanup = do
 
 {- configure git to use union merge driver on state files, if it is not
  - already -}
-gitAttributes :: Git.Repo -> IO ()
-gitAttributes repo = do
+gitAttributesWrite :: Git.Repo -> IO ()
+gitAttributesWrite repo = do
 	exists <- doesFileExist attributes
 	if not exists
 		then do
@@ -63,24 +64,34 @@ gitAttributes repo = do
 				appendFile attributes $ attrLine ++ "\n"
 				commit
 	where
-		attrLine = stateLoc ++ "*.log merge=union"
 		attributes = Git.attributes repo
 		commit = do
 			Git.run repo ["add", attributes]
 			Git.run repo ["commit", "-m", "git-annex setup", 
 					attributes]
 
+attrLine :: String		
+attrLine = stateLoc ++ "*.log merge=union"
+
 {- set up a git pre-commit hook, if one is not already present -}
-gitPreCommitHook :: Git.Repo -> IO ()
-gitPreCommitHook repo = do
-	let hook = Git.workTree repo ++ "/" ++ Git.gitDir repo ++
-		"/hooks/pre-commit"
-	exists <- doesFileExist hook
+gitPreCommitHookWrite :: Git.Repo -> Annex ()
+gitPreCommitHookWrite repo = do
+	exists <- liftIO $ doesFileExist hook
 	if exists
-		then putStrLn $ "pre-commit hook (" ++ hook ++ ") already exists, not configuring"
-		else do
-			writeFile hook $ "#!/bin/sh\n" ++
-				"# automatically configured by git-annex\n" ++ 
-				"git annex pre-commit .\n"
+		then warning $ "pre-commit hook (" ++ hook ++ ") already exists, not configuring"
+		else liftIO $ do
+			writeFile hook preCommitScript
 			p <- getPermissions hook
 			setPermissions hook $ p {executable = True}
+	where
+		hook = preCommitHook repo
+
+preCommitHook :: Git.Repo -> FilePath
+preCommitHook repo = 
+	Git.workTree repo ++ "/" ++ Git.gitDir repo ++ "/hooks/pre-commit"
+
+preCommitScript :: String
+preCommitScript = 
+		"#!/bin/sh\n" ++
+		"# automatically configured by git-annex\n" ++ 
+		"git annex pre-commit .\n"
diff --git a/Command/Uninit.hs b/Command/Uninit.hs
new file mode 100644
index 000000000..fcb77a92b
--- /dev/null
+++ b/Command/Uninit.hs
@@ -0,0 +1,59 @@
+{- git-annex command
+ -
+ - Copyright 2010 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Uninit where
+
+import Control.Monad.State (liftIO)
+import Control.Monad (when)
+import System.Directory
+
+import Command
+import Messages
+import Types
+import Utility
+import qualified GitRepo as Git
+import qualified Annex
+import qualified Command.Unannex
+import qualified Command.Init
+
+seek :: [SubCmdSeek]
+seek = [withAll withFilesInGit Command.Unannex.start, withNothing start]
+
+start :: SubCmdStartNothing
+start = do
+	showStart "uninit" ""
+	return $ Just $ perform
+
+perform :: SubCmdPerform
+perform = do
+	g <- Annex.gitRepo
+
+	gitPreCommitHookUnWrite g
+	liftIO $ gitAttributesUnWrite g
+
+	return $ Just $ return True
+
+gitPreCommitHookUnWrite :: Git.Repo -> Annex ()
+gitPreCommitHookUnWrite repo = do
+	let hook = Command.Init.preCommitHook repo
+	hookexists <- liftIO $ doesFileExist hook
+	when hookexists $ do
+		c <- liftIO $ readFile hook
+		if c == Command.Init.preCommitScript
+			then liftIO $ removeFile hook
+			else warning $ "pre-commit hook (" ++ hook ++ 
+				") contents modified; not deleting." ++
+				" Edit it to remove call to git annex."
+
+gitAttributesUnWrite :: Git.Repo -> IO ()
+gitAttributesUnWrite repo = do
+	let attributes = Git.attributes repo
+	attrexists <- doesFileExist attributes
+	when attrexists $ do
+		c <- readFileStrict attributes
+		writeFile attributes $ unlines $
+			filter (/= Command.Init.attrLine) $ lines c
diff --git a/Utility.hs b/Utility.hs
index 0f7ce42aa..2447c95a0 100644
--- a/Utility.hs
+++ b/Utility.hs
@@ -7,6 +7,7 @@
 
 module Utility (
 	hGetContentsStrict,
+	readFileStrict,
 	parentDir,
 	absPath,
 	relPathCwdToDir,
@@ -34,6 +35,10 @@ import Foreign (complement)
 hGetContentsStrict :: Handle -> IO String
 hGetContentsStrict h  = hGetContents h >>= \s -> length s `seq` return s
 
+{- A version of readFile that is not lazy. -}
+readFileStrict :: FilePath -> IO String
+readFileStrict f = readFile f >>= \s -> length s `seq` return s
+
 {- Returns the parent directory of a path. Parent of / is "" -}
 parentDir :: String -> String
 parentDir dir =
diff --git a/debian/changelog b/debian/changelog
index 9e378400c..b5ef4b5a0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -5,6 +5,7 @@ git-annex (0.11) UNRELEASED; urgency=low
   * Added remote.annex-rsync-options.
   * Avoid deleting temp files when rsync fails.
   * Improve detection of version 0 repos.
+  * Add uninit subcommand. Closes: #605749
 
  -- Joey Hess <joeyh@debian.org>  Thu, 02 Dec 2010 16:54:12 -0400
 
diff --git a/doc/git-annex.mdwn b/doc/git-annex.mdwn
index 63bc11eb7..66e8bbaa8 100644
--- a/doc/git-annex.mdwn
+++ b/doc/git-annex.mdwn
@@ -151,6 +151,12 @@ Many git-annex subcommands will stage changes for later `git commit` by you.
   any more. In that case you should use `git annex drop` instead, and you
   can also `git rm` the file.
 
+* uninit
+
+  Use this to stop using git annex. It will unannex every file in the
+  repository, and remove all of git-annex's other data, leaving you with a
+  git repository plus the previously annexed files.
+
 * fix [path ...]
 
   Fixes up symlinks that have become broken to again point to annexed content.