patch: include file name in binary patch error messages

 $ hg import --no-commit ../mercurial_1915035238540490516.patch
 applying ../mercurial_1915035238540490516.patch
 abort: could not extract binary data

Becomes:

 abort: could not extract "binary2" binary data

mercurial/patch.py

@@ -1022,9 +1022,10 b' class hunk(object):'
 
 class binhunk(object):
     'A binary patch file. Only understands literals so far.'
-    def __init__(self, lr):
+    def __init__(self, lr, fname):
         self.text = None
         self.hunk = ['GIT binary patch\n']
+        self._fname = fname
         self._read(lr)
 
     def complete(self):
@@ -1040,7 +1041,8 b' class binhunk(object):'
             line = lr.readline()
             self.hunk.append(line)
         if not line:
-            raise PatchError(_('could not extract binary patch'))
+            raise PatchError(_('could not extract "%s" binary data')
+                             % self._fname)
         size = int(line[8:].rstrip())
         dec = []
         line = lr.readline()
@@ -1054,14 +1056,14 b' class binhunk(object):'
             try:
                 dec.append(base85.b85decode(line[1:-1])[:l])
             except ValueError, e:
-                raise PatchError(_('could not decode binary patch: %s')
-                                 % str(e))
+                raise PatchError(_('could not decode "%s" binary patch: %s')
+                                 % (self._fname, str(e)))
             line = lr.readline()
             self.hunk.append(line)
         text = zlib.decompress(''.join(dec))
         if len(text) != size:
-            raise PatchError(_('binary patch is %d bytes, not %d') %
-                             len(text), size)
+            raise PatchError(_('"%s" length is %d bytes, should be %d')
+                             % (self._fname, len(text), size))
         self.text = text
 
 def parsefilename(str):
@@ -1200,7 +1202,7 b' def iterhunks(fp):'
                 gitpatches[-1].ispatching(afile, bfile)):
                 gp = gitpatches.pop()
             if x.startswith('GIT binary patch'):
-                h = binhunk(lr)
+                h = binhunk(lr, gp.path)
             else:
                 if context is None and x.startswith('***************'):
                     context = True

tests/test-import-git.t

@@ -364,6 +364,7 b' Move text file and patch as binary'
   R text2
 
 Invalid base85 content
+
   $ hg rollback
   repository tip rolled back to revision 15 (undo import)
   working directory now based on revision 15
@@ -379,8 +380,38 b' Invalid base85 content'
   > 
   > EOF
   applying patch from stdin
-  abort: could not decode binary patch: bad base85 character at position 6
+  abort: could not decode "binary2" binary patch: bad base85 character at position 6
   [255]
+
+  $ hg revert -aq
+  $ hg import -d "1000000 0" -m rename-as-binary - <<"EOF"
+  > diff --git a/text2 b/binary2
+  > rename from text2
+  > rename to binary2
+  > index 78981922613b2afb6025042ff6bd878ac1994e85..10efcb362e9f3b3420fcfbfc0e37f3dc16e29757
+  > GIT binary patch
+  > literal 6
+  > Mc$`b*O5$Pw00T?_*Z=?k
+  > 
+  > EOF
+  applying patch from stdin
+  abort: "binary2" length is 5 bytes, should be 6
+  [255]
+
+  $ hg revert -aq
+  $ hg import -d "1000000 0" -m rename-as-binary - <<"EOF"
+  > diff --git a/text2 b/binary2
+  > rename from text2
+  > rename to binary2
+  > index 78981922613b2afb6025042ff6bd878ac1994e85..10efcb362e9f3b3420fcfbfc0e37f3dc16e29757
+  > GIT binary patch
+  > Mc$`b*O5$Pw00T?_*Z=?k
+  > 
+  > EOF
+  applying patch from stdin
+  abort: could not extract "binary2" binary data
+  [255]
+
   $ cd ..
 
 Consecutive import with renames (issue2459)