[PATCH 1 of 5 V2] streamclone: use read()

[Gregory Szorc]

# HG changeset patch
# User Gregory Szorc <gregory.szorc at gmail.com>
# Date 1451776495 28800
#      Sat Jan 02 15:14:55 2016 -0800
# Node ID 8a33bbee1ed445f61c825a789d7c5b9d93295eef
# Parent  b8405d739149cdd6d8d9bd5e3dd2ad8487b1f09a
streamclone: use read()

We have a convenience API for reading the full contents of a file.
Use it.

diff --git a/mercurial/streamclone.py b/mercurial/streamclone.py
--- a/mercurial/streamclone.py
+++ b/mercurial/streamclone.py
@@ -207,22 +207,17 @@ def generatev1(repo):
     def emitrevlogdata():
         try:
             for name, size in entries:
                 if debugflag:
                     repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
                 # partially encode name over the wire for backwards compat
                 yield '%s\0%d\n' % (store.encodedir(name), size)
                 if size <= 65536:
-                    fp = svfs(name)
-                    try:
-                        data = fp.read(size)
-                    finally:
-                        fp.close()
-                    yield data
+                    yield svfs.read(name)
                 else:
                     for chunk in util.filechunkiter(svfs(name), limit=size):
                         yield chunk
         finally:
             svfs.mustaudit = oldaudit
 
     return len(entries), total_bytes, emitrevlogdata()