[PATCH STABLE] largefiles: fix an explicit largefile commit after a remove (issue4969)

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1453600277 18000
#      Sat Jan 23 20:51:17 2016 -0500
# Branch stable
# Node ID d07901a07264cc495565bce44eccb7d80afb7a25
# Parent  4c6053a6b17d682b34fb88bbeb5e94ed9085d900
largefiles: fix an explicit largefile commit after a remove (issue4969)

The change in b68797f244e4 to handle a normal -> largefile switch was too
aggressive in preserving the original matcher names.  If a largefile is
explicitly provided by the user, but only the standin exists in dirstate, then
only the standin can be committed.

There's still maybe an issue when the largefile is deleted outside of Mercurial:

  $ rm large
  $ hg ci -m "oops" large
  large: The system cannot find the file specified
  nothing changed
  [1]

That may be OK, since the standin file could have been changed since the last
commit, and this seems safer since the largefile isn't present to regenerate it.

diff --git a/hgext/largefiles/lfutil.py b/hgext/largefiles/lfutil.py
--- a/hgext/largefiles/lfutil.py
+++ b/hgext/largefiles/lfutil.py
@@ -575,11 +575,15 @@
         fstandin = standin(f)
 
         # For largefiles, only one of the normal and standin should be
-        # committed (except if one of them is a remove).
+        # committed (except if one of them is a remove).  In the case of a
+        # standin removal, drop the normal file if it is unknown to dirstate.
         # Thus, skip plain largefile names but keep the standin.
-        if (f in lfiles or fstandin in standins) and \
-            repo.dirstate[f] != 'r' and repo.dirstate[fstandin] != 'r':
-            continue
+        if f in lfiles or fstandin in standins:
+            if repo.dirstate[fstandin] != 'r':
+                if repo.dirstate[f] != 'r':
+                    continue
+            elif repo.dirstate[f] == '?':
+                continue
 
         actualfiles.append(f)
     match._files = actualfiles
diff --git a/tests/test-largefiles-cache.t b/tests/test-largefiles-cache.t
--- a/tests/test-largefiles-cache.t
+++ b/tests/test-largefiles-cache.t
@@ -17,7 +17,7 @@
   $ hg add --large large
   $ hg commit -m 'add largefile'
   $ hg rm large
-  $ hg commit -m 'branchhead without largefile'
+  $ hg commit -m 'branchhead without largefile' large
   $ hg up -qr 0
   $ cd ..