The version number is now derived from git, unless built with VERSION_FROM_CHANGELOG.

Build/Configure.hs

@@ -8,9 +8,12 @@ import System.Process
 import Control.Applicative
 import System.FilePath
 import System.Environment
+import Data.Maybe
 
 import Build.TestConfig
 import Utility.SafeCommand
+import Utility.Monad
+import Utility.Exception
 
 tests :: [TestCase]
 tests =
@@ -70,14 +73,34 @@ testCp k option = TestCase cmd $ testCmd k cmdline
 	cmd = "cp " ++ option
 	cmdline = cmd ++ " " ++ testFile ++ " " ++ testFile ++ ".new"
 
-{- Pulls package version out of the changelog. -}
+{- Version is usually based on the major version from the changelog, 
+ - plus the date of the last commit, plus the git rev of that commit.
+ - This works for autobuilds, ad-hoc builds, etc.
+ -
+ - For official builds, VERSION_FROM_CHANGELOG makes it use just the most
+ - recent version from the changelog.
+ -
+ - If git or a git repo is not available, or something goes wrong,
+ - just use the version from the changelog. -}
 getVersion :: Test
 getVersion = do
-	version <- getVersionString
+	changelogversion <- getChangelogVersion
+	version <- ifM (isJust <$> catchMaybeIO (getEnv "VERSION_FROM_CHANGELOG"))
+		( return changelogversion
+		, catchDefaultIO changelogversion $ do
+			let major = takeWhile (/= '.') changelogversion
+			autoversion <- readProcess "sh"
+				[ "-c"
+				, "git log -n 1 --format=format:'%ci %h'| sed -e 's/-//g' -e 's/ .* /-g/'"
+				] ""
+			if null autoversion
+				then return changelogversion
+				else return $ concat [ major, ".", autoversion ]
+		)
 	return $ Config "packageversion" (StringConfig version)
 	
-getVersionString :: IO String
-getVersionString = do
+getChangelogVersion :: IO String
+getChangelogVersion = do
 	changelog <- readFile "CHANGELOG"
 	let verline = head $ lines changelog
 	return $ middle (words verline !! 1)
@@ -97,7 +120,7 @@ getSshConnectionCaching = Config "sshconnectioncaching" . BoolConfig <$>
 {- Set up cabal file with version. -}
 cabalSetup :: IO ()
 cabalSetup = do
-	version <- getVersionString
+	version <- getChangelogVersion
 	cabal <- readFile cabalfile
 	writeFile tmpcabalfile $ unlines $ 
 		map (setfield "Version" version) $

debian/changelog

@@ -14,6 +14,8 @@ git-annex (4.20130406) UNRELEASED; urgency=low
     and connecting to it from another. (Note: Does not yet use HTTPS.)
   * webapp: When a repository's group is changed, rescan for transfers.
   * Added annex.web-download-command setting.
+  * The version number is now derived from git, unless built with
+    VERSION_FROM_CHANGELOG.
 
  -- Joey Hess <joeyh@debian.org>  Sat, 06 Apr 2013 15:24:15 -0400
 

debian/rules

@@ -3,6 +3,9 @@
 # Avoid using cabal, as it writes to $HOME
 export CABAL=./Setup
 
+# Do use the changelog's version number, rather than making one up.
+export VERSION_FROM_CHANGELOG=1
+
 %:
 	dh $@
 

doc/bugs/Incorrect_version_on_64_Standalone_Build.mdwn

@@ -7,3 +7,5 @@
 Shouldn't that be `4.20130405`?
 
 The md5sum of the build I downloaded is `aabbb3aa2397be206cae86f33db9eef4`.
+
+> [[done]]; new version will look like eg `4.20130410-gc149c67` --[[Joey]]