update

1 files changed, 36 insertions, 0 deletions

diff --git a/UUID.hs b/UUID.hs
new file mode 100644
index 000000000..a0e078482
--- /dev/null
+++ b/UUID.hs
@@ -0,0 +1,36 @@
+{- git-annex uuids
+ -
+ - Each git repository used by git-annex has an annex.uuid setting that
+ - uniquely identifies that repository.
+ -
+ -}
+
+module UUID (
+	getUUID,
+	prepUUID,
+	genUUID
+) where
+
+import System.Cmd.Utils
+import System.IO
+import GitRepo
+
+configkey="annex.uuid"
+
+{- Generates a UUID. There is a library for this, but it's not packaged,
+ - so use the command line tool. -}
+genUUID :: IO String
+genUUID = do
+	pOpen ReadFromPipe "uuid" ["-m"] $ \h -> hGetLine h
+
+getUUID :: GitRepo -> String
+getUUID repo = gitConfig repo "annex.uuid" ""
+
+{- Make sure that the repo has an annex.uuid setting. -}
+prepUUID :: GitRepo -> IO ()
+prepUUID repo =
+	if ("" == getUUID repo)
+		then do
+			uuid <- genUUID
+			gitRun repo ["config", configkey, uuid]
+		else return ()