[PATCH 3 of 5 flagprocessor v6] revlog: pass revlog flags to addrevision

Remi Chaintron remi at fb.com
Sat Dec 24 11:36:29 EST 2016

# HG changeset patch
# User Remi Chaintron <remi at fb.com>
# Date 1482451731 18000
#      Thu Dec 22 19:08:51 2016 -0500
# Node ID b1d220e584e6fc861a40a5aeefa0c3b19ae09126
# Parent  d0476160913323da1dada49ae46e72d6a7c17d78
revlog: pass revlog flags to addrevision

Adding the ability to passing flags to addrevision instead of simply passing
default flags to _addrevision will allow extensions relying on flag transforms
to wrap around addrevision() in order to update revlog flags.

The first use case of this patch will be the lfs extension marking nodes as
stored externally when the contents are larger than the defined threshold.

One of the reasons leading to setting flags in addrevision() wrappers in the
flag processor design is that it allows to detect files larger than the 2GB
limit before the check is performed, which allows lfs to transform the contents
into metadata.

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1235,11 +1235,6 @@
         if rev is None:
             rev = self.rev(node)
-        # check rev flags
-        if self.flags(rev) & ~REVIDX_KNOWN_FLAGS:
-            raise RevlogError(_('incompatible revision flag %x') %
-                              (self.flags(rev) & ~REVIDX_KNOWN_FLAGS))
         chain, stopped = self._deltachain(rev, stoprev=cachedrev)
         if stopped:
             text = self._cache[2]
@@ -1332,7 +1327,7 @@
     def addrevision(self, text, transaction, link, p1, p2, cachedelta=None,
-                    node=None):
+                    node=None, flags=REVIDX_DEFAULT_FLAGS):
         """add a revision to the log
         text - the revision data to add
@@ -1343,6 +1338,7 @@
         node - nodeid of revision; typically node is not specified, and it is
             computed by default as hash(text, p1, p2), however subclasses might
             use different hashing method (and override checkhash() in such case)
+        flags - the known flags to set on the revision
         if link == nullrev:
             raise RevlogError(_("attempted to add linkrev -1 to %s")
@@ -1363,8 +1359,7 @@
         ifh = self.opener(self.indexfile, "a+", checkambig=self._checkambig)
             return self._addrevision(node, text, transaction, link, p1, p2,
-                                     REVIDX_DEFAULT_FLAGS, cachedelta, ifh, dfh,
-                                     raw=False)
+                                     flags, cachedelta, ifh, dfh, raw=False)
             if dfh:

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