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git-lfs: Only do endpoint discovery once when concurrency is enabled

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This avoids some extra work, but I don't think it was possible for two ssh
endpoint discoveries run concurrently to both prompt for the ssh password;
Annex.Ssh itself deals with concurrency.

This is mostly groundwork for http password prompting.
This commit is contained in:
Joey Hess 2019-09-24 13:01:51 -04:00
parent 9418b516ac
commit de564df8b3
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2 changed files with 14 additions and 2 deletions
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1
CHANGELOG
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@ -2,6 +2,7 @@ git-annex (7.20190913) UNRELEASED; urgency=medium
* Added --mimetype and --mimeencoding file matching options.
* Added --unlocked and --locked file matching options.
* git-lfs: Only do endpoint discovery once when concurrency is enabled.
-- Joey Hess <id@joeyh.name> Thu, 19 Sep 2019 11:11:19 -0400

15
Remote/GitLFS.hs
View file

@ -42,6 +42,7 @@ import qualified Data.Map as M
import qualified Data.ByteString.Lazy as L
import qualified Data.Text as T
import qualified Data.Text.Encoding as E
import qualified Control.Concurrent.MSemN as MSemN
remote :: RemoteType
remote = RemoteType
@ -64,7 +65,8 @@ gen r u c gc = do
g <- Annex.gitRepo
liftIO $ Git.GCrypt.encryptedRemote g r
else pure r
h <- liftIO $ newTVarIO $ LFSHandle Nothing Nothing r' gc
sem <- liftIO $ MSemN.new 1
h <- liftIO $ newTVarIO $ LFSHandle Nothing Nothing sem r' gc
cst <- remoteCost gc expensiveRemoteCost
return $ Just $ specialRemote' specialcfg c
(simplyPrepare $ store u h)
@ -159,10 +161,19 @@ mySetup _ mu _ c gc = do
data LFSHandle = LFSHandle
{ downloadEndpoint :: Maybe LFS.Endpoint
, uploadEndpoint :: Maybe LFS.Endpoint
, getEndPointLock :: MSemN.MSemN Int
, remoteRepo :: Git.Repo
, remoteGitConfig :: RemoteGitConfig
}
-- Only let one thread at a time do endpoint discovery.
withEndPointLock :: LFSHandle -> Annex a -> Annex a
withEndPointLock h = bracket_
(liftIO $ MSemN.wait l 1)
(liftIO $ MSemN.signal l 1)
where
l = getEndPointLock h
discoverLFSEndpoint :: LFS.TransferRequestOperation -> LFSHandle -> Annex (Maybe LFS.Endpoint)
discoverLFSEndpoint tro h
| Git.repoIsSsh r = gossh
@ -223,7 +234,7 @@ getLFSEndpoint tro hv = do
h <- liftIO $ atomically $ readTVar hv
case f h of
Just endpoint -> return (Just endpoint)
Nothing -> discoverLFSEndpoint tro h >>= \case
Nothing -> withEndPointLock h $ discoverLFSEndpoint tro h >>= \case
Just endpoint -> do
liftIO $ atomically $ writeTVar hv $
case tro of