init: Catch more exceptions when testing locking.

Annex/Init.hs

@@ -51,6 +51,7 @@ import qualified Utility.LockFile.Posix as Posix
 #endif
 
 import qualified Data.Map as M
+import Data.Either
 
 checkCanInitialize :: Annex a -> Annex a
 checkCanInitialize a = inRepo (noAnnexFileContent . Git.repoWorkTree) >>= \case
@@ -233,9 +234,10 @@ probeLockSupport = do
 		mode <- annexFileMode
 		liftIO $ do
 			nukeFile f
-			ok <- catchBoolIO $ do
+			let locktest = 
-				Posix.dropLock =<< Posix.lockExclusive (Just mode) f
+				Posix.lockExclusive (Just mode) f
-				return True
+					>>= Posix.dropLock
+			ok <- isRight <$> tryNonAsync locktest
 			nukeFile f
 			return ok
 #endif

CHANGELOG

@@ -18,6 +18,7 @@ git-annex (7.20190826) UNRELEASED; urgency=medium
     fix a bug that prevented annex.thin from taking effect for the files
     in working tree.
   * Avoid making a commit when upgrading from direct mode to v7.
+  * init: Catch more exceptions when testing locking.
 
  -- Joey Hess <id@joeyh.name>  Sat, 24 Aug 2019 12:54:35 -0400
 

doc/bugs/regression__58___fails_to_detect_need_for_pidlock_on_an_NSF_mount/comment_1_82a71d4e9656c83e2d50143cb8a31602._comment

@@ -0,0 +1,16 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2019-08-29T16:11:14Z"
+ content="""
+No changes in the code of the lock test. Somehow the exception
+was not caught, and it's only catching IO exceptions, so it must
+be another type of exception.
+
+Oddly, I can't find any indication that waitToSetLock can throw anything
+other than an IO exception.
+
+I've changed it to catch all exceptions, which will presumably fix the
+problem, but not closing this bug as I don't fully understand it and so am
+not certian of the fix.
+"""]]