[PATCH 2/2] Tell multi-parent diff about core.symlinks.

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When core.symlinks is false, and a merge of symbolic links had conflicts,
the merge result is left as a file in the working directory. A decision
must be made whether the file is treated as a regular file or as a
symbolic link. This patch treats the file as a symbolic link only if
all merge parents were also symbolic links.

Signed-off-by: Johannes Sixt <johannes.sixt@xxxxxxxxxx>
---

I'm not quite sure whether this patch is worth it. The only thing it seems
to do is to avoid the mode change line (this is after a merge where 'symlink'
had a conflict):

without the patch:

  $ git diff
  diff --cc symlink
  index 1a010b1,30d67d4..0000000
  mode 120000,120000..100644
  --- a/symlink
  +++ b/symlink

with the patch:

  $ git diff
  diff --cc symlink
  index 1a010b1,30d67d4..0000000
  --- a/symlink
  +++ b/symlink


 combine-diff.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/combine-diff.c b/combine-diff.c
index 044633d..e6e3969 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -699,8 +699,18 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 			 !fstat(fd, &st)) {
 			size_t len = st.st_size;
 			size_t sz = 0;
+			int is_file, i;
 
 			elem->mode = canon_mode(st.st_mode);
+			/* if symlinks don't work, assume symlink if all parents
+			 * are symlinks
+			 */
+			is_file = has_symlinks;
+			for (i = 0; !is_file && i < num_parent; i++)
+				is_file = !S_ISLNK(elem->parent[i].mode);
+			if (!is_file)
+				elem->mode = canon_mode(S_IFLNK);
+
 			result_size = len;
 			result = xmalloc(len + 1);
 			while (sz < len) {
-- 
1.5.0.2.4.gdd4e4-dirty
-
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