1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
{- git-annex transfers
-
- Copyright 2012-2014 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Annex.Transfer (
module X,
upload,
download,
runTransfer,
alwaysRunTransfer,
noRetry,
forwardRetry,
) where
import Common.Annex
import Logs.Transfer as X
import Annex.Notification as X
import Annex.Perms
import Utility.Metered
#ifdef mingw32_HOST_OS
import Utility.LockFile
#endif
import Control.Concurrent
upload :: UUID -> Key -> AssociatedFile -> RetryDecider -> (MeterUpdate -> Annex Bool) -> NotifyWitness -> Annex Bool
upload u key f d a _witness = runTransfer (Transfer Upload u key) f d a
download :: UUID -> Key -> AssociatedFile -> RetryDecider -> (MeterUpdate -> Annex Bool) -> NotifyWitness -> Annex Bool
download u key f d a _witness = runTransfer (Transfer Download u key) f d a
{- Runs a transfer action. Creates and locks the lock file while the
- action is running, and stores info in the transfer information
- file.
-
- If the transfer action returns False, the transfer info is
- left in the failedTransferDir.
-
- If the transfer is already in progress, returns False.
-
- An upload can be run from a read-only filesystem, and in this case
- no transfer information or lock file is used.
-}
runTransfer :: Transfer -> Maybe FilePath -> RetryDecider -> (MeterUpdate -> Annex Bool) -> Annex Bool
runTransfer = runTransfer' False
{- Like runTransfer, but ignores any existing transfer lock file for the
- transfer, allowing re-running a transfer that is already in progress.
-
- Note that this may result in confusing progress meter display in the
- webapp, if multiple processes are writing to the transfer info file. -}
alwaysRunTransfer :: Transfer -> Maybe FilePath -> RetryDecider -> (MeterUpdate -> Annex Bool) -> Annex Bool
alwaysRunTransfer = runTransfer' True
runTransfer' :: Bool -> Transfer -> Maybe FilePath -> RetryDecider -> (MeterUpdate -> Annex Bool) -> Annex Bool
runTransfer' ignorelock t file shouldretry a = do
info <- liftIO $ startTransferInfo file
(meter, tfile, metervar) <- mkProgressUpdater t info
mode <- annexFileMode
(fd, inprogress) <- liftIO $ prep tfile mode info
if inprogress && not ignorelock
then do
showNote "transfer already in progress"
return False
else do
ok <- retry info metervar $
bracketIO (return fd) (cleanup tfile) (const $ a meter)
unless ok $ recordFailedTransfer t info
return ok
where
#ifndef mingw32_HOST_OS
prep tfile mode info = do
mfd <- catchMaybeIO $
openFd (transferLockFile tfile) ReadWrite (Just mode)
defaultFileFlags { trunc = True }
case mfd of
Nothing -> return (Nothing, False)
Just fd -> do
setFdOption fd CloseOnExec True
locked <- catchMaybeIO $
setLock fd (WriteLock, AbsoluteSeek, 0, 0)
if isNothing locked
then do
closeFd fd
return (Nothing, True)
else do
void $ tryIO $ writeTransferInfoFile info tfile
return (mfd, False)
#else
prep tfile _mode info = do
v <- catchMaybeIO $ lockExclusive (transferLockFile tfile)
case v of
Nothing -> return (Nothing, False)
Just Nothing -> return (Nothing, True)
Just (Just lockhandle) -> do
void $ tryIO $ writeTransferInfoFile info tfile
return (Just lockhandle, False)
#endif
cleanup _ Nothing = noop
cleanup tfile (Just lockhandle) = do
void $ tryIO $ removeFile tfile
#ifndef mingw32_HOST_OS
void $ tryIO $ removeFile $ transferLockFile tfile
closeFd lockhandle
#else
{- Windows cannot delete the lockfile until the lock
- is closed. So it's possible to race with another
- process that takes the lock before it's removed,
- so ignore failure to remove.
-}
dropLock lockhandle
void $ tryIO $ removeFile $ transferLockFile tfile
#endif
retry oldinfo metervar run = do
v <- tryNonAsync run
case v of
Right b -> return b
Left e -> do
warning (show e)
b <- getbytescomplete metervar
let newinfo = oldinfo { bytesComplete = Just b }
if shouldretry oldinfo newinfo
then retry newinfo metervar run
else return False
getbytescomplete metervar
| transferDirection t == Upload =
liftIO $ readMVar metervar
| otherwise = do
f <- fromRepo $ gitAnnexTmpObjectLocation (transferKey t)
liftIO $ catchDefaultIO 0 $ getFileSize f
type RetryDecider = TransferInfo -> TransferInfo -> Bool
noRetry :: RetryDecider
noRetry _ _ = False
{- Retries a transfer when it fails, as long as the failed transfer managed
- to send some data. -}
forwardRetry :: RetryDecider
forwardRetry old new = bytesComplete old < bytesComplete new
|
