[PATCH] Remove uncontested renamed files during merge.

["Shawn O. Pearce" <spearce@spearce.org>]

Prior to 65ac6e9c3f47807cb603af07a6a9e1a43bc119ae we deleted a
file from the working directory during a merge if the file existed
in the working directory before the merge started but was renamed
by the branch which is being merged in.  This broke in 65ac63 as
git-merge-recursive did not actually update the working directory
on this uncontested rename case.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---

 The same repository that spawned my 'Bug in merge-recursive in
 virtual commit corner case' thread discovered this feature of
 git-merge-recursive today.

 I'm not sure this is the right way to fix the issue, but it does
 appear to fix the problem and passes both the existing tests and
 this new one.

 merge-recursive.c        |    2 +-
 t/t6024-merge-rename2.sh |   97 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+), 1 deletions(-)

diff --git a/merge-recursive.c b/merge-recursive.c
index 9d53bcd..741d17f 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -873,7 +873,7 @@ static int process_renames(struct path_list *a_renames,
 			struct diff_filespec src_other, dst_other;
 			int try_merge, stage = a_renames == renames1 ? 3: 2;
 
-			remove_file(1, ren1_src, 1);
+			remove_file(1, ren1_src, 0);
 
 			hashcpy(src_other.sha1, ren1->src_entry->stages[stage].sha);
 			src_other.mode = ren1->src_entry->stages[stage].mode;
diff --git a/t/t6024-merge-rename2.sh b/t/t6024-merge-rename2.sh
new file mode 100755
index 0000000..69c66cf
--- /dev/null
+++ b/t/t6024-merge-rename2.sh
@@ -0,0 +1,97 @@
+#!/bin/sh
+
+test_description='Merge-recursive merging renames'
+. ./test-lib.sh
+
+test_expect_success setup \
+'
+cat >A <<\EOF &&
+a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+b bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+c cccccccccccccccccccccccccccccccccccccccccccccccc
+d dddddddddddddddddddddddddddddddddddddddddddddddd
+e eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
+f ffffffffffffffffffffffffffffffffffffffffffffffff
+g gggggggggggggggggggggggggggggggggggggggggggggggg
+h hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
+i iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
+j jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
+k kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
+l llllllllllllllllllllllllllllllllllllllllllllllll
+m mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
+n nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
+o oooooooooooooooooooooooooooooooooooooooooooooooo
+EOF
+
+cat >M <<\EOF &&
+A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+B BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
+C CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
+D DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
+E EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
+F FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
+G GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
+H HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
+I IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
+J JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ
+K KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK
+L LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
+M MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
+N NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
+O OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
+EOF
+
+git add A M &&
+git commit -m "initial has A and M" &&
+git branch white &&
+git branch red &&
+
+git checkout white &&
+sed -e "/^g /s/.*/g : white changes a line/" <A >B &&
+sed -e "/^G /s/.*/G : colored branch changes a line/" <M >N &&
+rm -f A M &&
+git update-index --add --remove A B M N &&
+git commit -m "white renames A->B, M->N" &&
+
+git checkout red &&
+echo created by red >R &&
+git update-index --add R &&
+git commit -m "red creates R" &&
+
+git checkout master'
+
+# This test broke in 65ac6e9c3f47807cb603af07a6a9e1a43bc119ae
+test_expect_success 'merge white into red (A->B,M->N)' \
+'
+	git checkout -b red-white red &&
+	git merge white &&
+	git write-tree >/dev/null || {
+		echo "BAD: merge did not complete"
+		return 1
+	}
+
+	test -f B || {
+		echo "BAD: B does not exist in working directory"
+		return 1
+	}
+	test -f N || {
+		echo "BAD: N does not exist in working directory"
+		return 1
+	}
+	test -f R || {
+		echo "BAD: R does not exist in working directory"
+		return 1
+	}
+
+	test -f A && {
+		echo "BAD: A still exists in working directory"
+		return 1
+	}
+	test -f M && {
+		echo "BAD: M still exists in working directory"
+		return 1
+	}
+	return 0
+'
+
+test_done
--