lfs: access revlog directly

LFS is monkeypatching filelog.filelog and is then accessing
various filelog attributes in the monkeypatched function. This is all
fine.

But some of the attributes being accessed by LFS are revlog centric
and shouldn't be exposed on the file storage interface.

This commit changes the monkeypatched functions to access proxied
attributes on self._revlog instead of self.

This should be safe to do because non-revlog repositories should not
be using filelog instances: instead they should have a separate class
to represent file storage. So it is reasonable for LFS to assume the
_revlog attribute exists and points to a revlog.

Differential Revision: https://phab.mercurial-scm.org/D4714

hgext/lfs/wrapper.py

@@ -115,19 +115,19 b' def _islfs(rlog, node=None, rev=None):'
         if node is None:
             # both None - likely working copy content where node is not ready
             return False
-        rev = rlog.rev(node)
+        rev = rlog._revlog.rev(node)
     else:
-        node = rlog.node(rev)
+        node = rlog._revlog.node(rev)
     if node == nullid:
         return False
-    flags = rlog.flags(rev)
+    flags = rlog._revlog.flags(rev)
     return bool(flags & revlog.REVIDX_EXTSTORED)
 
 def filelogaddrevision(orig, self, text, transaction, link, p1, p2,
                        cachedelta=None, node=None,
                        flags=revlog.REVIDX_DEFAULT_FLAGS, **kwds):
     # The matcher isn't available if reposetup() wasn't called.
-    lfstrack = self.opener.options.get('lfstrack')
+    lfstrack = self._revlog.opener.options.get('lfstrack')
 
     if lfstrack:
         textlen = len(text)
@@ -144,7 +144,7 b' def filelogaddrevision(orig, self, text,'
 
 def filelogrenamed(orig, self, node):
     if _islfs(self, node):
-        rawtext = self.revision(node, raw=True)
+        rawtext = self._revlog.revision(node, raw=True)
         if not rawtext:
             return False
         metadata = pointer.deserialize(rawtext)
@@ -157,7 +157,7 b' def filelogrenamed(orig, self, node):'
 def filelogsize(orig, self, rev):
     if _islfs(self, rev=rev):
         # fast path: use lfs metadata to answer size
-        rawtext = self.revision(rev, raw=True)
+        rawtext = self._revlog.revision(rev, raw=True)
         metadata = pointer.deserialize(rawtext)
         return int(metadata['size'])
     return orig(self, rev)

mercurial/filelog.py

@@ -57,7 +57,7 b' class filelog(object):'
     def linkrev(self, rev):
         return self._revlog.linkrev(rev)
 
-    # Used by LFS, verify.
+    # Used by verify.
     def flags(self, rev):
         return self._revlog.flags(rev)
 
@@ -207,7 +207,7 b' class filelog(object):'
     def indexfile(self, value):
         self._revlog.indexfile = value
 
-    # Used by LFS, repo upgrade.
+    # Used by repo upgrade.
     @property
     def opener(self):
         return self._revlog.opener

tests/test-lfs.t

@@ -692,7 +692,7 b" absence doesn't cause an abort.)"
   >             continue
   >         sizes = [fl.rawsize(i) for i in fl]
   >         texts = [fl.revision(i, raw=True) for i in fl]
-  >         flags = [int(fl.flags(i)) for i in fl]
+  >         flags = [int(fl._revlog.flags(i)) for i in fl]
   >         hashes = [hash(t) for t in texts]
   >         print('  %s: rawsizes=%r flags=%r hashes=%r'
   >               % (name, sizes, flags, hashes))