From 724b511d4fb363ebee828ba3992c831ba006444c Mon Sep 17 00:00:00 2001
From: Junio C Hamano <junkio@cox.net>
Date: Sun, 11 Dec 2005 16:44:05 -0800
Subject: [PATCH] merge-recursive: conflicting rename case.

This changes the way the case two branches rename the same path
to different paths is handled.  Earlier, the code removed the
original path and added both destinations to the index at
stage0.  This commit changes it to leave the original path at
stage1, and two destination paths at stage2 and stage3,
respectively.

[jc: I am not really sure if this makes much difference in the
real life merge situations.  What should happen when our branch
renames A to B and M to N, while their branch renames A to M?
That is, M remains in our tree as is.]

Signed-off-by: Junio C Hamano <junkio@cox.net>
---
 git-merge-recursive.py  | 38 +++++++++++++++++++++++++++-----------
 t/t6022-merge-rename.sh | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 11 deletions(-)

diff --git a/git-merge-recursive.py b/git-merge-recursive.py
index f1320a69..56c3641a 100755
--- a/git-merge-recursive.py
+++ b/git-merge-recursive.py
@@ -283,12 +283,20 @@ def updateFileExt(sha, mode, path, updateCache, updateWd):
 def setIndexStages(path,
                    oSHA1, oMode,
                    aSHA1, aMode,
-                   bSHA1, bMode):
+                   bSHA1, bMode,
+                   clear=True):
+    istring = []
+    if clear:
+        istring.append("0 " + ("0" * 40) + "\t" + path + "\0")
+    if oMode:
+        istring.append("%o %s %d\t%s\0" % (oMode, oSHA1, 1, path))
+    if aMode:
+        istring.append("%o %s %d\t%s\0" % (aMode, aSHA1, 2, path))
+    if bMode:
+        istring.append("%o %s %d\t%s\0" % (bMode, bSHA1, 3, path))
+
     runProgram(['git-update-index', '-z', '--index-info'],
-               input="0 " + ("0" * 40) + "\t" + path + "\0" + \
-               "%o %s %d\t%s\0" % (oMode, oSHA1, 1, path) + \
-               "%o %s %d\t%s\0" % (aMode, aSHA1, 2, path) + \
-               "%o %s %d\t%s\0" % (bMode, bSHA1, 3, path))
+               input="".join(istring))
 
 def removeFile(clean, path):
     updateCache = cacheOnly or clean
@@ -570,7 +578,7 @@ def processRenames(renamesA, renamesB, branchNameA, branchNameB):
             continue
 
         ren1.processed = True
-        removeFile(True, ren1.srcName)
+
         if ren2:
             # Renamed in 1 and renamed in 2
             assert(ren1.srcName == ren2.srcName)
@@ -598,13 +606,19 @@ def processRenames(renamesA, renamesB, branchNameA, branchNameB):
                            'adding as', dstName2, 'instead.')
                     removeFile(False, ren2.dstName)
                 else:
-                    dstName2 = ren1.dstName
+                    dstName2 = ren2.dstName
+                setIndexStages(dstName1,
+                               None, None,
+                               ren1.dstSha, ren1.dstMode,
+			       None, None)
+                setIndexStages(dstName2,
+                               None, None,
+                               None, None,
+                               ren2.dstSha, ren2.dstMode)
 
-                # NEEDSWORK: place dstNameA at stage 2 and dstNameB at stage 3
-                # What about other stages???
-                updateFile(False, ren1.dstSha, ren1.dstMode, dstName1)
-                updateFile(False, ren2.dstSha, ren2.dstMode, dstName2)
             else:
+                removeFile(True, ren1.srcName)
+
                 [resSha, resMode, clean, merge] = \
                          mergeFile(ren1.srcName, ren1.srcSha, ren1.srcMode,
                                    ren1.dstName, ren1.dstSha, ren1.dstMode,
@@ -630,6 +644,8 @@ def processRenames(renamesA, renamesB, branchNameA, branchNameB):
 
                 updateFile(clean, resSha, resMode, ren1.dstName)
         else:
+            removeFile(True, ren1.srcName)
+
             # Renamed in 1, maybe changed in 2
             if renamesA == renames1:
                 stage = 3
diff --git a/t/t6022-merge-rename.sh b/t/t6022-merge-rename.sh
index 153b9e49..1292cafd 100755
--- a/t/t6022-merge-rename.sh
+++ b/t/t6022-merge-rename.sh
@@ -161,4 +161,41 @@ test_expect_success 'pull unrenaming branch into renaming one' \
 	}
 '
 
+test_expect_success 'pull conflicting renames' \
+'
+	git reset --hard
+	git show-branch
+	git pull . blue && {
+		echo "BAD: should have conflicted"
+		exit 1
+	}
+	test "$(git ls-files -u A | wc -l)" -eq 1 || {
+		echo "BAD: should have left a stage"
+		exit 1	
+	}
+	test "$(git ls-files -u B | wc -l)" -eq 1 || {
+		echo "BAD: should have left a stage"
+		exit 1	
+	}
+	test "$(git ls-files -u C | wc -l)" -eq 1 || {
+		echo "BAD: should have left a stage"
+		exit 1	
+	}
+	test "$(git ls-files -s N | wc -l)" -eq 1 || {
+		echo "BAD: should have merged N"
+		exit 1	
+	}
+	sed -ne "/^g/{
+	p
+	q
+	}" B | grep red || {
+		echo "BAD: should have listed our change first"
+		exit 1
+	}
+	test "$(git diff white N | wc -l)" -eq 0 || {
+		echo "BAD: should have taken colored branch"
+		exit 1
+	}
+'
+
 test_done
-- 
2.11.0