stop using git commit date as version

This turns out to have been prolimatic because building from a git tag
would make a git-annex that claimed a different version than the tag's
version.

The git rev is still included in the version, and people who want
to know the exact tree that was built can just use that, so there's no
real benefit to automatically advancing the date part of the version.

.gitignore

@@ -5,7 +5,6 @@ Setup
 tmp
 test
 Build/SysConfig
-Build/SysConfig.hs
 Build/InstallDesktopFile
 Build/EvilSplicer
 Build/Standalone

Build/Version.hs

@@ -22,12 +22,11 @@ type Version = String
 isReleaseBuild :: IO Bool
 isReleaseBuild = (== Just "1") <$> catchMaybeIO (getEnv "RELEASE_BUILD")
 
-{- 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.
+{- Version comes from the CHANGELOG, plus the git rev of the last commit.
  - This works for autobuilds, ad-hoc builds, etc.
  -
  - If git or a git repo is not available, or something goes wrong,
- - or this is a release build, just use the version from the changelog. -}
+ - or this is a release build, just use the version from the CHANGELOG. -}
 getVersion :: IO Version
 getVersion = do
 	changelogversion <- getChangelogVersion
@@ -35,13 +34,17 @@ getVersion = do
 		( return changelogversion
 		, catchDefaultIO changelogversion $ do
 			let major = takeWhile (/= '.') changelogversion
-			autoversion <- takeWhile (\c -> isAlphaNum c || c == '-') <$> readProcess "sh"
+			gitversion <- takeWhile (\c -> isAlphaNum c) <$> readProcess "sh"
 				[ "-c"
-				, "git log -n 1 --format=format:'%ci %h'| sed -e 's/-//g' -e 's/ .* /-g/'"
+				, "git log -n 1 --format=format:'%h'"
 				] ""
-			if null autoversion
-				then return changelogversion
-				else return $ concat [ major, ".", autoversion ]
+			return $ if null gitversion
+				then changelogversion
+				else concat
+					[ changelogversion
+					, "-g"
+					, gitversion
+					]
 		)
 	
 getChangelogVersion :: IO Version