From 738e9291ed15980bdac568fc5f9507a43897ba52 Mon Sep 17 00:00:00 2001
From: Kyle Manna <kyle@kylemanna.com>
Date: Fri, 6 Nov 2015 08:12:50 -0800
Subject: [PATCH] obnamlib: sftp: Add prefetch size argument

Paramiko made this argument required in v1.16.  Details at
https://github.com/paramiko/paramiko/commit/49072f3537a8981e9d448c22481a1d2b92c03643

Attempt to fetch the entire file.  I'm unsure if this is the original
intent.  If the entire file isn't to be fetched, then the prefetch() is
probably not needed.
---
 obnamlib/plugins/sftp_plugin.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/obnamlib/plugins/sftp_plugin.py b/obnamlib/plugins/sftp_plugin.py
index c4d5c2f..a5bc72b 100644
--- a/obnamlib/plugins/sftp_plugin.py
+++ b/obnamlib/plugins/sftp_plugin.py
@@ -555,7 +555,7 @@ class SftpFS(obnamlib.VirtualFileSystem):
     def cat(self, pathname):
         self._delay()
         f = self.open(pathname, 'rb')
-        f.prefetch()
+        f.prefetch(self.lstat(pathname).st_size)
         chunks = []
         while True:
             chunk = f.read(self.chunk_size)
-- 
2.6.2