From abde98cda21d5deeb16ed3baf736b06fdc2fce2f Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kitenet.net>
Date: Fri, 3 Aug 2012 10:45:18 -0400
Subject: [PATCH] init: If no description is provided for a new repository, one
 will automatically be generated, like "joey@gnu:~/foo"

---
 Init.hs            | 22 +++++++++++++++++++++-
 debian/changelog   |  2 ++
 doc/git-annex.mdwn |  3 ++-
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/Init.hs b/Init.hs
index bddcc696e0..291e346f5f 100644
--- a/Init.hs
+++ b/Init.hs
@@ -19,6 +19,26 @@ import Logs.UUID
 import Annex.Version
 import Annex.UUID
 
+import System.Posix.User
+
+genDescription :: Maybe String -> Annex String
+genDescription (Just d) = return d
+genDescription Nothing = do
+	hostname <- getHostname
+	let at = if null hostname then "" else "@"
+	username <- clicketyclickety
+	reldir <- liftIO . relHome =<< fromRepo Git.repoPath
+	return $ concat [username, at, hostname, ":", reldir]
+	where
+		{- Haskell lacks uname(2) bindings, except in the
+		 - Bindings.Uname addon. Rather than depend on that,
+		 - use uname -n when available. -}
+		getHostname = liftIO $ catchDefaultIO uname_node ""
+		uname_node = takeWhile (/= '\n') <$>
+			readProcess "uname" ["-n"]	
+		clicketyclickety = liftIO $ userName <$>
+			(getUserEntryForID =<< getEffectiveUserID)
+
 initialize :: Maybe String -> Annex ()
 initialize mdescription = do
 	prepUUID
@@ -26,7 +46,7 @@ initialize mdescription = do
 	setVersion
 	gitPreCommitHookWrite
 	u <- getUUID
-	maybe (recordUUID u) (describeUUID u) mdescription
+	describeUUID u =<< genDescription mdescription
 
 uninitialize :: Annex ()
 uninitialize = do
diff --git a/debian/changelog b/debian/changelog
index 82bf5009a1..081d1ac9f8 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,8 @@ git-annex (3.20120722) UNRELEASED; urgency=low
 
   * initremote: Avoid recording remote's description before checking
     that its config is valid.
+  * init: If no description is provided for a new repository, one will
+    automatically be generated, like "joey@gnu:~/foo"
 
  -- Joey Hess <joeyh@debian.org>  Fri, 27 Jul 2012 21:04:47 -0400
 
diff --git a/doc/git-annex.mdwn b/doc/git-annex.mdwn
index c52a5f3bf9..a3fc82b55f 100644
--- a/doc/git-annex.mdwn
+++ b/doc/git-annex.mdwn
@@ -194,7 +194,8 @@ subdirectories).
   using it in a repository that was not intended to have an annex.
 
   It's useful, but not mandatory, to initialize each new clone
-  of a repository with its own description.
+  of a repository with its own description. If you don't provide one,
+  one will be generated.
 
 * describe repository description