Removed support for git versions older than 2.1

debian oldoldstable has 2.1, and that's what i386ancient uses. It would be
better to require git 2.2, which is needed to use adjusted branches, but
can't do that w/o losing support for some old linux kernels or a
complicated git backport.

Annex.hs

@@ -118,7 +118,7 @@ data AnnexState = AnnexState
 	, catfilehandles :: M.Map FilePath CatFileHandle
 	, hashobjecthandle :: Maybe HashObjectHandle
 	, checkattrhandle :: Maybe CheckAttrHandle
-	, checkignorehandle :: Maybe (Maybe CheckIgnoreHandle)
+	, checkignorehandle :: Maybe CheckIgnoreHandle
 	, forcebackend :: Maybe String
 	, globalnumcopies :: Maybe NumCopies
 	, forcenumcopies :: Maybe NumCopies

Annex/CheckIgnore.hs

@@ -19,23 +19,19 @@ import qualified Annex
 checkIgnored :: FilePath -> Annex Bool
 checkIgnored file = go =<< checkIgnoreHandle
   where
-	go Nothing = return False
-	go (Just h) = liftIO $ Git.checkIgnored h file
+	go h = liftIO $ Git.checkIgnored h file
 
-checkIgnoreHandle :: Annex (Maybe Git.CheckIgnoreHandle)
+checkIgnoreHandle :: Annex Git.CheckIgnoreHandle
 checkIgnoreHandle = maybe startup return =<< Annex.getState Annex.checkignorehandle
   where
 	startup = do
-		v <- inRepo Git.checkIgnoreStart
-		when (isNothing v) $
-			warning "The installed version of git is too old for .gitignores to be honored by git-annex."
-		Annex.changeState $ \s -> s { Annex.checkignorehandle = Just v }
-		return v
+		h <- inRepo Git.checkIgnoreStart
+		Annex.changeState $ \s -> s { Annex.checkignorehandle = Just h }
+		return h
 
 checkIgnoreStop :: Annex ()
 checkIgnoreStop = maybe noop stop =<< Annex.getState Annex.checkignorehandle
   where
-	stop (Just h) = do
+	stop h = do
 		liftIO $ Git.checkIgnoreStop h
 		Annex.changeState $ \s -> s { Annex.checkignorehandle = Nothing }
-	stop Nothing = noop

Annex/Fixup.hs

@@ -12,7 +12,6 @@ import Git.Config
 import Types.GitConfig
 import Config.Files
 import qualified Git
-import qualified Git.BuildVersion
 import Utility.Path
 import Utility.SafeCommand
 import Utility.Directory
@@ -42,9 +41,7 @@ fixupRepo r c = do
 {- Disable git's built-in wildcard expansion, which is not wanted
  - when using it as plumbing by git-annex. -}
 disableWildcardExpansion :: Repo -> Repo
-disableWildcardExpansion r
-	| Git.BuildVersion.older "1.8.1" = r
-	| otherwise = r
+disableWildcardExpansion r = r
 	{ gitGlobalOpts = gitGlobalOpts r ++ [Param "--literal-pathspecs"] }
 
 {- Direct mode repos have core.bare=true, but are not really bare.

Build/Configure.hs

@@ -62,7 +62,7 @@ getGitVersion = go =<< getEnv "FORCE_GIT_VERSION"
 	go (Just s) = return $ Config "gitversion" $ StringConfig s
 	go Nothing = do
 		v <- Git.Version.installed
-		let oldestallowed = Git.Version.normalize "1.7.1.0"
+		let oldestallowed = Git.Version.normalize "2.1"
 		when (v < oldestallowed) $
 			error $ "installed git version " ++ show v ++ " is too old! (Need " ++ show oldestallowed ++ " or newer)"
 		return $ Config "gitversion" $ StringConfig $ show v

CHANGELOG

@@ -31,6 +31,7 @@ git-annex (7.20190826) UNRELEASED; urgency=medium
   * init: Catch more exceptions when testing locking.
   * init: Fix a reversion that broke initialization on systems that
     need to use pid locking.
+  * Removed support for git versions older than 2.1.
 
  -- Joey Hess <id@joeyh.name>  Sat, 24 Aug 2019 12:54:35 -0400
 

Git/Branch.hs

@@ -15,7 +15,6 @@ import Git.Sha
 import Git.Command
 import qualified Git.Config
 import qualified Git.Ref
-import qualified Git.BuildVersion
 
 {- The currently checked out branch.
  -
@@ -125,8 +124,7 @@ data CommitMode = ManualCommit | AutomaticCommit
 {- Prevent signing automatic commits. -}
 applyCommitMode :: CommitMode -> [CommandParam] -> [CommandParam]
 applyCommitMode commitmode ps
-	| commitmode == AutomaticCommit && not (Git.BuildVersion.older "2.0.0") =
-		Param "--no-gpg-sign" : ps
+	| commitmode == AutomaticCommit = Param "--no-gpg-sign" : ps
 	| otherwise = ps
 
 {- Some versions of git commit-tree honor commit.gpgsign themselves,

Git/CheckAttr.hs

@@ -10,12 +10,11 @@ module Git.CheckAttr where
 import Common
 import Git
 import Git.Command
-import qualified Git.Version
 import qualified Utility.CoProcess as CoProcess
 
 import System.IO.Error
 
-type CheckAttrHandle = (CoProcess.CoProcessHandle, [Attr], Bool, String)
+type CheckAttrHandle = (CoProcess.CoProcessHandle, [Attr], String)
 
 type Attr = String
 
@@ -25,8 +24,7 @@ checkAttrStart :: [Attr] -> Repo -> IO CheckAttrHandle
 checkAttrStart attrs repo = do
 	currdir <- getCurrentDirectory
 	h <- gitCoProcessStart True params repo
-	oldgit <- Git.Version.older "1.7.7"
-	return (h, attrs, oldgit, currdir)
+	return (h, attrs, currdir)
   where
 	params =
 		[ Param "check-attr" 
@@ -36,12 +34,12 @@ checkAttrStart attrs repo = do
 		[ Param "--" ]
 
 checkAttrStop :: CheckAttrHandle -> IO ()
-checkAttrStop (h, _, _, _) = CoProcess.stop h
+checkAttrStop (h, _, _) = CoProcess.stop h
 
 {- Gets an attribute of a file. When the attribute is not specified,
  - returns "" -}
 checkAttr :: CheckAttrHandle -> Attr -> FilePath -> IO String
-checkAttr (h, attrs, oldgit, currdir) want file = do
+checkAttr (h, attrs, currdir) want file = do
 	pairs <- CoProcess.query h send (receive "")
 	let vals = map snd $ filter (\(attr, _) -> attr == want) pairs
 	case vals of
@@ -78,16 +76,9 @@ checkAttr (h, attrs, oldgit, currdir) want file = do
 			else Nothing -- line incomplete
 	numattrs = length attrs
 
-	{- Before git 1.7.7, git check-attr worked best with
-	 - absolute filenames; using them worked around some bugs
-	 - with relative filenames.
-	 - 
-	 - With newer git, git check-attr chokes on some absolute
-	 - filenames, and the bugs that necessitated them were fixed,
-	 - so use relative filenames. -}
-	file'
-		| oldgit = absPathFrom currdir file
-		| otherwise = relPathDirToFileAbs currdir $ absPathFrom currdir file
+	{- git check-attr chokes on some absolute filenames,
+	 - so make sure the filename is relative. -}
+	file' = relPathDirToFileAbs currdir $ absPathFrom currdir file
 	oldattrvalue attr l = end bits !! 0
 	  where
 		bits = split sep l

Git/CheckIgnore.hs

@@ -15,7 +15,6 @@ module Git.CheckIgnore (
 import Common
 import Git
 import Git.Command
-import qualified Git.Version
 import qualified Utility.CoProcess as CoProcess
 
 import System.IO.Error
@@ -29,17 +28,11 @@ type CheckIgnoreHandle = CoProcess.CoProcessHandle
  - GIT_FLUSH behavior flushing the output buffer when git check-ignore
  - is piping to us.
  -
- - The first version of git to support what we need is 1.8.4.
- - Nothing is returned if an older git is installed.
- -
  - check-ignore does not support --literal-pathspecs, so remove that
  - from the gitGlobalOpts if set.
  -}
-checkIgnoreStart :: Repo -> IO (Maybe CheckIgnoreHandle)
-checkIgnoreStart repo = ifM supportedGitVersion
-	( Just <$> gitCoProcessStart True params repo'
-	, return Nothing
-	)
+checkIgnoreStart :: Repo -> IO CheckIgnoreHandle
+checkIgnoreStart repo = gitCoProcessStart True params repo'
   where
 	params =
 		[ Param "check-ignore" 
@@ -52,11 +45,6 @@ checkIgnoreStart repo = ifM supportedGitVersion
 	pathspecs (Param "--literal-pathspecs") = True
 	pathspecs _ = False
 
-supportedGitVersion :: IO Bool
-supportedGitVersion = do
-	v <- Git.Version.installed
-	return $ v >= Git.Version.normalize "1.8.4"
-
 {- For some reason, check-ignore --batch always exits nonzero, 
  - so ignore any error. -}
 checkIgnoreStop :: CheckIgnoreHandle -> IO ()

Git/Fsck.hs

@@ -22,7 +22,6 @@ import Git
 import Git.Command
 import Git.Sha
 import Utility.Batch
-import qualified Git.Version
 
 import qualified Data.Set as S
 import Control.Concurrent.Async
@@ -73,9 +72,7 @@ instance Monoid FsckOutput where
  -}
 findBroken :: Bool -> Repo -> IO FsckResults
 findBroken batchmode r = do
-	supportsNoDangling <- (>= Git.Version.normalize "1.7.10")
-		<$> Git.Version.installed
-	let (command, params) = ("git", fsckParams supportsNoDangling r)
+	let (command, params) = ("git", fsckParams r)
 	(command', params') <- if batchmode
 		then toBatchCommand (command, params)
 		else return (command, params)
@@ -86,8 +83,8 @@ findBroken batchmode r = do
 			, std_err = CreatePipe
 			}
 	(o1, o2) <- concurrently
-		(parseFsckOutput maxobjs r supportsNoDangling (stdoutHandle p))
-		(parseFsckOutput maxobjs r supportsNoDangling (stderrHandle p))
+		(parseFsckOutput maxobjs r (stdoutHandle p))
+		(parseFsckOutput maxobjs r (stderrHandle p))
 	fsckok <- checkSuccessProcess pid
 	case mappend o1 o2 of
 		FsckOutput badobjs truncated
@@ -120,15 +117,15 @@ knownMissing (FsckFoundMissing s _) = s
 findMissing :: [Sha] -> Repo -> IO MissingObjects
 findMissing objs r = S.fromList <$> filterM (`isMissing` r) objs
 
-parseFsckOutput :: Int -> Repo -> Bool -> Handle -> IO FsckOutput
-parseFsckOutput maxobjs r supportsNoDangling h = do
+parseFsckOutput :: Int -> Repo -> Handle -> IO FsckOutput
+parseFsckOutput maxobjs r h = do
 	ls <- lines <$> hGetContents h
 	if null ls
 		then return NoFsckOutput
 		else if all ("duplicateEntries" `isInfixOf`) ls
 			then return AllDuplicateEntriesWarning
 			else do
-				let shas = findShas supportsNoDangling ls
+				let shas = findShas ls
 				let !truncated = length shas > maxobjs
 				missingobjs <- findMissing (take maxobjs shas) r
 				return $ FsckOutput missingobjs truncated
@@ -141,18 +138,14 @@ isMissing s r = either (const True) (const False) <$> tryIO dump
 		, Param (fromRef s)
 		] r
 
-findShas :: Bool -> [String] -> [Sha]
-findShas supportsNoDangling = catMaybes . map extractSha . concat . map words . filter wanted
+findShas :: [String] -> [Sha]
+findShas = catMaybes . map extractSha . concat . map words . filter wanted
   where
-	wanted l
-		| supportsNoDangling = True
-		| otherwise = not ("dangling " `isPrefixOf` l)
+	wanted l = not ("dangling " `isPrefixOf` l)
 
-fsckParams :: Bool -> Repo -> [CommandParam]
-fsckParams supportsNoDangling = gitCommandLine $ map Param $ catMaybes
-	[ Just "fsck"
-	, if supportsNoDangling
-		then Just "--no-dangling"
-		else Nothing
-	, Just "--no-reflogs"
+fsckParams :: Repo -> [CommandParam]
+fsckParams = gitCommandLine $ map Param
+	[ "fsck"
+	, "--no-dangling"
+	, "--no-reflogs"
 	]

Git/Merge.hs

@@ -17,7 +17,6 @@ module Git.Merge (
 import Common
 import Git
 import Git.Command
-import qualified Git.BuildVersion
 import qualified Git.Version
 import Git.Branch (CommitMode(..))
 
@@ -33,7 +32,7 @@ merge = merge' []
 
 merge' :: [CommandParam] -> Ref -> [MergeConfig] -> CommitMode -> Repo -> IO Bool
 merge' extraparams branch mergeconfig commitmode r
-	| MergeNonInteractive `notElem` mergeconfig || Git.BuildVersion.older "1.7.7.6" =
+	| MergeNonInteractive `notElem` mergeconfig =
 		go [Param $ fromRef branch]
 	| otherwise = go [Param "--no-edit", Param $ fromRef branch]
   where

Git/Remote/Remove.hs

@@ -13,17 +13,10 @@ import Common
 import Git
 import Git.Types
 import qualified Git.Command
-import qualified Git.Version
 
 remove :: RemoteName -> Repo -> IO ()
-remove remotename r = do
-	old <- Git.Version.older "1.8.0"
-	Git.Command.run
+remove remotename = Git.Command.run
 	[ Param "remote"
-		-- name of this subcommand changed
-		, Param $
-			if old
-				then "rm"
-				else "remove"
+	, Param "remove"
 	, Param remotename
-		] r
+	]

debian/control

@@ -81,7 +81,7 @@ Build-Depends:
 	lsof [linux-any],
 	ikiwiki,
 	libimage-magick-perl,
-	git (>= 1:1.8.1),
+	git (>= 1:2.1),
 	rsync,
 	curl,
 	openssh-client,