From 7c12f0ac9224246dac308e837bccb5b2157062ee Mon Sep 17 00:00:00 2001
From: Joey Hess <id@joeyh.name>
Date: Tue, 15 Dec 2015 17:47:59 -0700
Subject: Import git-repair_1.20151215.orig.tar.xz

[dgit import orig git-repair_1.20151215.orig.tar.xz]
---
 Utility/Rsync.hs | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 Utility/Rsync.hs

(limited to 'Utility/Rsync.hs')

diff --git a/Utility/Rsync.hs b/Utility/Rsync.hs
new file mode 100644
index 0000000..3aaf928
--- /dev/null
+++ b/Utility/Rsync.hs
@@ -0,0 +1,141 @@
+{- various rsync stuff
+ -
+ - Copyright 2010-2013 Joey Hess <id@joeyh.name>
+ -
+ - License: BSD-2-clause
+ -}
+
+{-# LANGUAGE CPP #-}
+
+module Utility.Rsync where
+
+import Common
+import Utility.Metered
+
+import Data.Char
+import System.Console.GetOpt
+import Data.Tuple.Utils
+
+{- Generates parameters to make rsync use a specified command as its remote
+ - shell. -}
+rsyncShell :: [CommandParam] -> [CommandParam]
+rsyncShell command = [Param "-e", Param $ unwords $ map escape (toCommand command)]
+  where
+	{- rsync requires some weird, non-shell like quoting in
+	- here. A doubled single quote inside the single quoted
+	- string is a single quote. -}
+	escape s = "'" ++  intercalate "''" (split "'" s) ++ "'"
+
+{- Runs rsync in server mode to send a file. -}
+rsyncServerSend :: [CommandParam] -> FilePath -> IO Bool
+rsyncServerSend options file = rsync $
+	rsyncServerParams ++ Param "--sender" : options ++ [File file]
+
+{- Runs rsync in server mode to receive a file. -}
+rsyncServerReceive :: [CommandParam] -> FilePath -> IO Bool
+rsyncServerReceive options file = rsync $
+	rsyncServerParams ++ options ++ [File file]
+
+rsyncServerParams :: [CommandParam]
+rsyncServerParams =
+	[ Param "--server"
+	-- preserve timestamps
+	, Param "-t"
+	-- allow resuming of transfers of big files
+	, Param "--inplace"
+	-- other options rsync normally uses in server mode
+	, Param "-e.Lsf"
+	, Param "."
+	]
+
+rsyncUseDestinationPermissions :: CommandParam
+rsyncUseDestinationPermissions = Param "--chmod=ugo=rwX"
+
+rsync :: [CommandParam] -> IO Bool
+rsync = boolSystem "rsync" . rsyncParamsFixup
+
+{- On Windows, rsync is from Cygwin, and expects to get Cygwin formatted
+ - paths to files. (It thinks that C:foo refers to a host named "C").
+ - Fix up the Params appropriately. -}
+rsyncParamsFixup :: [CommandParam] -> [CommandParam]
+#ifdef mingw32_HOST_OS
+rsyncParamsFixup = map fixup
+  where
+	fixup (File f) = File (toCygPath f)
+	fixup (Param s)
+		| rsyncUrlIsPath s = Param (toCygPath s)
+	fixup p = p
+#else
+rsyncParamsFixup = id
+#endif
+
+{- Checks if an rsync url involves the remote shell (ssh or rsh).
+ - Use of such urls with rsync requires additional shell
+ - escaping. -}
+rsyncUrlIsShell :: String -> Bool
+rsyncUrlIsShell s
+	| "rsync://" `isPrefixOf` s = False
+	| otherwise = go s
+  where
+	-- host::dir is rsync protocol, while host:dir is ssh/rsh
+	go [] = False
+	go (c:cs)
+		| c == '/' = False -- got to directory with no colon
+		| c == ':' = not $ ":" `isPrefixOf` cs
+		| otherwise = go cs
+
+{- Checks if a rsync url is really just a local path. -}
+rsyncUrlIsPath :: String -> Bool
+rsyncUrlIsPath s
+#ifdef mingw32_HOST_OS
+	| not (null (takeDrive s)) = True
+#endif
+	| rsyncUrlIsShell s = False
+	| otherwise = ':' `notElem` s
+
+{- Runs rsync, but intercepts its progress output and updates a progress
+ - meter.
+ -
+ - The params must enable rsync's --progress mode for this to work.
+ -}
+rsyncProgress :: OutputHandler -> MeterUpdate -> [CommandParam] -> IO Bool
+rsyncProgress oh meter = commandMeter parseRsyncProgress oh meter "rsync" . rsyncParamsFixup
+
+{- Strategy: Look for chunks prefixed with \r (rsync writes a \r before
+ - the first progress output, and each thereafter). The first number
+ - after the \r is the number of bytes processed. After the number,
+ - there must appear some whitespace, or we didn't get the whole number,
+ - and return the \r and part we did get, for later processing.
+ -
+ - In some locales, the number will have one or more commas in the middle
+ - of it.
+ -}
+parseRsyncProgress :: ProgressParser
+parseRsyncProgress = go [] . reverse . progresschunks
+  where
+	go remainder [] = (Nothing, remainder)
+	go remainder (x:xs) = case parsebytes (findbytesstart x) of
+		Nothing -> go (delim:x++remainder) xs
+		Just b -> (Just (toBytesProcessed b), remainder)
+
+	delim = '\r'
+
+	{- Find chunks that each start with delim.
+	 - The first chunk doesn't start with it
+	 - (it's empty when delim is at the start of the string). -}
+	progresschunks = drop 1 . split [delim]
+	findbytesstart s = dropWhile isSpace s
+
+	parsebytes :: String -> Maybe Integer
+	parsebytes s = case break isSpace s of
+		([], _) -> Nothing
+		(_, []) -> Nothing
+		(b, _) -> readish $ filter (/= ',') b
+
+{- Filters options to those that are safe to pass to rsync in server mode,
+ - without causing it to eg, expose files. -}
+filterRsyncSafeOptions :: [String] -> [String]
+filterRsyncSafeOptions = fst3 . getOpt Permute
+	[ Option [] ["bwlimit"] (reqArgLong "bwlimit") "" ]
+  where
+	reqArgLong x = ReqArg (\v -> "--" ++ x ++ "=" ++ v) ""
-- 
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