From: Junio C Hamano <gitster@pobox.com>
Date: Wed, 28 May 2008 22:12:30 +0000 (-0700)
Subject: unpack_trees(): allow callers to differentiate worktree errors from merge errors
X-Git-Tag: v1.5.6-rc1~12^2~1
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=2e2b887d1c2c2385825160e587d711ecb5935ef5;p=git.git

unpack_trees(): allow callers to differentiate worktree errors from merge errors

Instead of uniformly returning -1 on any error, this teaches
unpack_trees() to return -2 when the merge itself is Ok but worktree
refuses to get updated.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/unpack-trees.c b/unpack-trees.c
index 0de5a31c0..cba0aca06 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -358,8 +358,13 @@ static int unpack_failed(struct unpack_trees_options *o, const char *message)
 	return -1;
 }
 
+/*
+ * N-way merge "len" trees.  Returns 0 on success, -1 on failure to manipulate the
+ * resulting index, -2 on failure to reflect the changes to the work tree.
+ */
 int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options *o)
 {
+	int ret;
 	static struct cache_entry *dfc;
 
 	if (len > MAX_UNPACK_TREES)
@@ -404,11 +409,10 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
 		return unpack_failed(o, "Merge requires file-level merging");
 
 	o->src_index = NULL;
-	if (check_updates(o))
-		return -1;
+	ret = check_updates(o) ? (-2) : 0;
 	if (o->dst_index)
 		*o->dst_index = o->result;
-	return 0;
+	return ret;
 }
 
 /* Here come the merge functions */