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merge-recursive: fix assumption that head tree being merged is HEAD

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`git merge-recursive` does a three-way merge between user-specified trees
base, head, and remote.  Since the user is allowed to specify head, we can
not necesarily assume that head == HEAD.

Modify index_has_changes() to take an extra argument specifying the tree
to compare against.  If NULL, it will compare to HEAD.  We then use this
from merge-recursive to make sure we compare to the user-specified head.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren
2018-06-30 18:25:00 -07:00
committed by Junio C Hamano
parent 92702392ce
commit e1f8694f33
5 changed files with 21 additions and 13 deletions
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2
merge-recursive.c
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@ -1983,7 +1983,7 @@ int merge_trees(struct merge_options *o,
if (oid_eq(&common->object.oid, &merge->object.oid)) {
struct strbuf sb = STRBUF_INIT;
if (!o->call_depth && index_has_changes(&the_index, &sb)) {
if (!o->call_depth && index_has_changes(&the_index, head, &sb)) {
err(o, _("Your local changes to the following files would be overwritten by merge:\n %s"),
sb.buf);
return -1;