# HG changeset patch
# User Siddharth Agarwal <sid0@fb.com>
# Date 1409401778 25200
# Node ID d226fe36e3626b47ad5bd73aac874125900e8d41
# Parent  8b980fbbd6dcb3a1dce1151b88096fe995694db1
memctx: allow extensions to determine what filectxfn should do

Rev 650b5b6e75ed switched the contract for filectxfn from "raise IOError if
file is missing" to "return None if file is missing". Out of tree extensions
need to be updated for that, but for extensions interested in compatibility
with both Mercurial <= 3.1 and default, it is next to impossible to introspect
core Mercurial to figure out what to do.

This patch adds a field to memctx for extensions to use.

diff -r 8b980fbbd6dc -r d226fe36e362 mercurial/context.py
--- a/mercurial/context.py	Sat Aug 30 15:17:37 2014 +0200
+++ b/mercurial/context.py	Sat Aug 30 05:29:38 2014 -0700
@@ -1593,6 +1593,12 @@
     supported by util.parsedate() and defaults to current date, extra
     is a dictionary of metadata or is left empty.
     """
+
+    # Mercurial <= 3.1 expects the filectxfn to raise IOError for missing files.
+    # Extensions that need to retain compatibility across Mercurial 3.1 can use
+    # this field to determine what to do in filectxfn.
+    _returnnoneformissingfiles = True
+
     def __init__(self, repo, parents, text, files, filectxfn, user=None,
                  date=None, extra=None, editor=False):
         super(memctx, self).__init__(repo, text, user, date, extra)