# HG changeset patch
# User Phil Cohen <phillco@fb.com>
# Date 2017-08-31 18:28:59
# Node ID 67cfffbfb6a0b9c798c8d245091e15aa3025bfa5
# Parent  52bd006b4f49b839d67b57a0fb50f11132a7b796

filemerge: eliminate most uses of tempfiles

Emphasize that they're unused so we can more easily remove them later.

Differential Revision: https://phab.mercurial-scm.org/D399

diff --git a/mercurial/filemerge.py b/mercurial/filemerge.py
--- a/mercurial/filemerge.py
+++ b/mercurial/filemerge.py
@@ -318,7 +318,7 @@ def _premerge(repo, fcd, fco, fca, toolc
     tool, toolpath, binary, symlink = toolconf
     if symlink or fcd.isabsent() or fco.isabsent():
         return 1
-    a, b, c, back = files
+    unused, unused, unused, back = files
 
     ui = repo.ui
 
@@ -347,7 +347,8 @@ def _premerge(repo, fcd, fco, fca, toolc
             ui.debug(" premerge successful\n")
             return 0
         if premerge not in validkeep:
-            util.copyfile(back, a) # restore from backup and try again
+            # restore from backup and try again
+            util.copyfile(back, repo.wjoin(fcd.path()))
     return 1 # continue merging
 
 def _mergecheck(repo, mynode, orig, fcd, fco, fca, toolconf):
@@ -368,8 +369,6 @@ def _merge(repo, mynode, orig, fcd, fco,
     files. It will fail if there are any conflicts and leave markers in
     the partially merged file. Markers will have two sections, one for each side
     of merge, unless mode equals 'union' which suppresses the markers."""
-    a, b, c, back = files
-
     ui = repo.ui
 
     r = simplemerge.simplemerge(ui, fcd, fca, fco,
@@ -424,7 +423,6 @@ def _imergeauto(repo, mynode, orig, fcd,
     """
     assert localorother is not None
     tool, toolpath, binary, symlink = toolconf
-    a, b, c, back = files
     r = simplemerge.simplemerge(repo.ui, fcd, fca, fco,
                                 label=labels, localorother=localorother,
                                 repo=repo)
@@ -470,7 +468,7 @@ def _idump(repo, mynode, orig, fcd, fco,
     This implies permerge. Therefore, files aren't dumped, if premerge
     runs successfully. Use :forcedump to forcibly write files out.
     """
-    a, b, c, back = files
+    a, unused, unused, unused = files
 
     fd = fcd.path()
 
@@ -720,7 +718,7 @@ def _filemerge(premerge, repo, mynode, o
 
 def _check(r, ui, tool, fcd, files):
     fd = fcd.path()
-    a, b, c, back = files
+    a, unused, unused, back = files
 
     if not r and (_toolbool(ui, tool, "checkconflicts") or
                   'conflicts' in _toollist(ui, tool, "check")):