diff options
Diffstat (limited to 'Logs/Export.hs')
| -rw-r--r-- | Logs/Export.hs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Logs/Export.hs b/Logs/Export.hs index a0019a06c..1fd1460fc 100644 --- a/Logs/Export.hs +++ b/Logs/Export.hs @@ -12,6 +12,9 @@ import qualified Data.Map as M import Annex.Common import qualified Annex.Branch import qualified Git +import qualified Git.Branch +import Git.Tree +import Git.FilePath import Logs import Logs.UUIDBased import Annex.UUID @@ -40,6 +43,9 @@ data ExportChange = ExportChange -- newTreeish. This way, when multiple repositories are exporting to -- the same special remote, there's no conflict as long as they move -- forward in lock-step. +-- +-- Also, the newTreeish is grafted into the git-annex branch. This is done +-- to ensure that it's available later. recordExport :: UUID -> ExportChange -> Annex () recordExport remoteuuid ec = do c <- liftIO currentVectorClock @@ -50,6 +56,7 @@ recordExport remoteuuid ec = do . changeLog c u val . M.mapWithKey (updateothers c u) . parseLogNew parseExportLog + graftTreeish (newTreeish ec) where updateothers c u theiru le@(LogEntry _ (ExportLog t remoteuuid')) | u == theiru || remoteuuid' /= remoteuuid || t `notElem` oldTreeish ec = le @@ -65,3 +72,20 @@ parseExportLog :: String -> Maybe ExportLog parseExportLog s = case words s of (t:u:[]) -> Just $ ExportLog (Git.Ref t) (toUUID u) _ -> Nothing + +-- To prevent git-annex branch merge conflicts, the treeish is +-- first grafted in and then removed in a subsequent commit. +graftTreeish :: Git.Ref -> Annex () +graftTreeish treeish = do + branchref <- Annex.Branch.getBranch + Tree t <- inRepo $ getTree branchref + t' <- inRepo $ recordTree $ Tree $ + RecordedSubTree (asTopFilePath graftpoint) treeish [] : t + commit <- inRepo $ Git.Branch.commitTree Git.Branch.AutomaticCommit + "export tree" [branchref] t' + origtree <- inRepo $ recordTree (Tree t) + commit' <- inRepo $ Git.Branch.commitTree Git.Branch.AutomaticCommit + "export tree cleanup" [commit] origtree + inRepo $ Git.Branch.update' Annex.Branch.fullname commit' + where + graftpoint = "export.tree" |