From 54513c69baffa40f2fcce42eb8651fdd98e05277 Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kitenet.net>
Date: Thu, 18 Nov 2010 13:30:42 -0400
Subject: [PATCH] Add configure step to build process.

* configure: Check to see if cp -a can be used.
* configure: Check to see if cp --reflink=auto can be used.
---
 .gitignore       |  2 ++
 Makefile         |  8 +++--
 configure.hs     | 78 ++++++++++++++++++++++++++++++++++++++++++++++++
 debian/changelog |  3 ++
 4 files changed, 89 insertions(+), 2 deletions(-)
 create mode 100644 configure.hs

diff --git a/.gitignore b/.gitignore
index 6956c49dd2..a4cac10f43 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 build/*
 test
+configure
+SysConfig.hs
 git-annex
 git-annex.1
 doc/.ikiwiki
diff --git a/Makefile b/Makefile
index 77e7a5edb8..685044146f 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,11 @@ all: git-annex docs
 
 ghcmake=ghc -Wall -odir build -hidir build -O2 --make 
 
-git-annex:
+SysConfig.hs:
+	$(ghcmake) configure
+	./configure
+
+git-annex: SysConfig.hs
 	$(ghcmake) git-annex
 
 install:
@@ -29,7 +33,7 @@ docs:
 		--disable-plugin=smiley
 
 clean:
-	rm -rf build git-annex git-annex.1 test
+	rm -rf build git-annex git-annex.1 test configure SysConfig.hs
 	rm -rf doc/.ikiwiki html
 
 .PHONY: git-annex test install
diff --git a/configure.hs b/configure.hs
new file mode 100644
index 0000000000..fa07be3ab5
--- /dev/null
+++ b/configure.hs
@@ -0,0 +1,78 @@
+{- Checks system configuration and generates SysConfig.hs.
+ -}
+
+import System.IO
+import System.Cmd
+import System.Exit
+import System.Directory
+
+type Test = IO Bool
+data TestDesc = TestDesc String String Test
+data Config = Config String Bool
+
+tests :: [TestDesc]
+tests = [
+	  TestDesc "cp -a" "cp_a" cp_a
+	, TestDesc "cp --reflink" "cp_reflink" cp_reflink
+	]
+
+tmpDir :: String
+tmpDir = "tmp"
+
+testFile :: String
+testFile = tmpDir ++ "/testfile"
+
+quiet :: String -> String
+quiet s = s ++ " 2>/dev/null"
+
+cp_a :: Test
+cp_a = testCmd $ quiet $ "cp -a " ++ testFile ++ " " ++ testFile ++ ".new"
+
+cp_reflink :: Test
+cp_reflink = testCmd $ quiet $ "cp --reflink=auto " ++ testFile ++ " " ++ testFile ++ ".new"
+
+testCmd :: String -> Test
+testCmd c = do
+	ret <- system c
+	return $ ret == ExitSuccess
+
+testStart :: String -> IO ()
+testStart s = do
+	putStr $ "  checking " ++ s ++ "..."
+	hFlush stdout
+
+testEnd :: Bool -> IO ()
+testEnd r = putStrLn $ " " ++ (show r)
+
+writeSysConfig :: [Config] -> IO ()
+writeSysConfig config = do
+	writeFile "SysConfig.hs" $ unlines $ header ++ vars config ++ footer
+	where
+		header = [
+			  "{- Automatically generated by configure. -}"
+			, "module SysConfig where"
+			]
+		footer = []
+		vars [] = []
+		vars (c:cs) = showvar c ++ vars cs
+		showvar (Config name val) = [
+			  name ++ " :: Bool"
+			, name ++ " = " ++ show val
+			]
+
+runTests :: [TestDesc] -> IO [Config]
+runTests [] = return []
+runTests ((TestDesc tname key t):ts) = do
+	testStart tname
+	val <- t
+	testEnd val
+	rest <- runTests ts
+	return $ (Config key val):rest
+
+main :: IO ()
+main = do
+	createDirectoryIfMissing True tmpDir
+	writeFile testFile "test file contents"
+	config <- runTests tests
+	removeDirectoryRecursive tmpDir
+	writeSysConfig config
diff --git a/debian/changelog b/debian/changelog
index 2a8871c30e..e6549c1f08 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,9 @@
 git-annex (0.08) UNRELEASED; urgency=low
 
   * Fix `git annex add ../foo` (when ran in a subdir of the repo).
+  * Add configure step to build process.
+  * configure: Check to see if cp -a can be used.
+  * configure: Check to see if cp --reflink=auto can be used.
 
  -- Joey Hess <joeyh@debian.org>  Wed, 17 Nov 2010 13:54:49 -0400