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merge-recursive: avoid directory rename detection in recursive case

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Ever since commit 8c8e5bd6eb ("merge-recursive: switch directory
rename detection default", 2019-04-05), the default handling with
directory rename detection was to report a conflict and leave unstaged
entries in the index.  However, when creating a virtual merge base in
the recursive case, we absolutely need a tree, and the only way a tree
can be written is if we have no unstaged entries -- otherwise we hit a
BUG().

There are a few fixes possible here which at least fix the BUG(), but
none of them seem optimal for other reasons; see the comments with the
new testcase 13e in t6043 for details (which testcase triggered a BUG()
prior to this patch).  As such, just opt for a very conservative and
simple choice that is still relatively reasonable: have the recursive
case treat 'conflict' as 'false' for opt->detect_directory_renames.

Reported-by: Emily Shaffer <emilyshaffer@google.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren
2019-08-05 15:33:50 -07:00
committed by Junio C Hamano
parent 4d8ec15c66
commit ff6d54771a
2 changed files with 113 additions and 1 deletions
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merge-recursive.c
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@ -2856,7 +2856,8 @@ static int detect_and_process_renames(struct merge_options *opt,
head_pairs = get_diffpairs(opt, common, head);
merge_pairs = get_diffpairs(opt, common, merge);
if (opt->detect_directory_renames) {
if ((opt->detect_directory_renames == 2) ||
(opt->detect_directory_renames == 1 && !opt->call_depth)) {
dir_re_head = get_directory_renames(head_pairs);
dir_re_merge = get_directory_renames(merge_pairs);