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From: Ben Peart <Ben.Peart@microsoft.com>
To: "peartben@gmail.com" <peartben@gmail.com>
Cc: Ben Peart <Ben.Peart@microsoft.com>,
	"git@vger.kernel.org" <git@vger.kernel.org>,
	Kevin Willford <kewillf@microsoft.com>,
	"newren@gmail.com" <newren@gmail.com>
Subject: [PATCH v2 2/2] merge-recursive: preserve skip_worktree bit when necessary
Date: Fri, 27 Jul 2018 12:59:44 +0000	[thread overview]
Message-ID: <20180727125923.11744-3-benpeart@microsoft.com> (raw)
In-Reply-To: <20180727125923.11744-1-benpeart@microsoft.com>

From: Elijah Newren <newren@gmail.com>

merge-recursive takes any files marked as unmerged by unpack_trees,
tries to figure out whether they can be resolved (e.g. using renames
or a file-level merge), and then if they can be it will delete the old
cache entries and writes new ones.  This means that any ce_flags for
those cache entries are essentially cleared when merging.

Unfortunately, if a file was marked as skip_worktree and it needs a
file-level merge but the merge results in the same version of the file
that was found in HEAD, we skip updating the worktree (because the
file was unchanged) but clear the skip_worktree bit (because of the
delete-cache-entry-and-write-new-one).  This makes git treat the file
as having a local change in the working copy, namely a delete, when it
should appear as unchanged despite not being present.  Avoid this
problem by copying the skip_worktree flag in this case.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-recursive.c               | 16 ++++++++++++++++
 t/t3507-cherry-pick-conflict.sh |  2 +-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/merge-recursive.c b/merge-recursive.c
index 113c1d6962..fd74bca173 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -3069,10 +3069,26 @@ static int merge_content(struct merge_options *o,
 	if (mfi.clean &&
 	    was_tracked_and_matches(o, path, &mfi.oid, mfi.mode) &&
 	    !df_conflict_remains) {
+		int pos;
+		struct cache_entry *ce;
+
 		output(o, 3, _("Skipped %s (merged same as existing)"), path);
 		if (add_cacheinfo(o, mfi.mode, &mfi.oid, path,
 				  0, (!o->call_depth && !is_dirty), 0))
 			return -1;
+		/*
+		 * However, add_cacheinfo() will delete the old cache entry
+		 * and add a new one.  We need to copy over any skip_worktree
+		 * flag to avoid making the file appear as if it were
+		 * deleted by the user.
+		 */
+		pos = index_name_pos(&o->orig_index, path, strlen(path));
+		ce = o->orig_index.cache[pos];
+		if (ce_skip_worktree(ce)) {
+			pos = index_name_pos(&the_index, path, strlen(path));
+			ce = the_index.cache[pos];
+			ce->ce_flags |= CE_SKIP_WORKTREE;
+		}
 		return mfi.clean;
 	}
 
diff --git a/t/t3507-cherry-pick-conflict.sh b/t/t3507-cherry-pick-conflict.sh
index 45ddd81bfa..0db166152a 100755
--- a/t/t3507-cherry-pick-conflict.sh
+++ b/t/t3507-cherry-pick-conflict.sh
@@ -392,7 +392,7 @@ test_expect_success 'commit --amend -s places the sign-off at the right place' '
 	test_cmp expect actual
 '
 
-test_expect_failure 'cherry-pick preserves sparse-checkout' '
+test_expect_success 'cherry-pick preserves sparse-checkout' '
 	pristine_detach initial &&
 	test_config core.sparseCheckout true &&
 	test_when_finished "
-- 
2.17.0.gvfs.1.123.g449c066


  parent reply	other threads:[~2018-07-27 12:59 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-20 19:53 [BUG] merge-recursive overly aggressive when skipping updating the working tree Ben Peart
2018-07-20 20:48 ` Elijah Newren
2018-07-20 21:13   ` Junio C Hamano
2018-07-20 21:42     ` Elijah Newren
2018-07-20 22:05       ` Junio C Hamano
2018-07-20 23:02         ` Elijah Newren
2018-07-23 12:49           ` Ben Peart
2018-07-21  6:34 ` [PATCH 0/2] Preserve skip_worktree bit in merges when necessary Elijah Newren
2018-07-21  6:34   ` [PATCH 1/2] t3507: add a testcase showing failure with sparse checkout Elijah Newren
2018-07-21  7:21     ` Eric Sunshine
2018-07-23 13:12       ` Ben Peart
2018-07-23 18:09         ` Eric Sunshine
2018-07-23 18:22           ` Ben Peart
2018-07-21 13:02     ` Ben Peart
2018-07-23 18:12       ` Junio C Hamano
2018-07-21  6:34   ` [PATCH 2/2] merge-recursive: preserve skip_worktree bit when necessary Elijah Newren
2018-07-23 14:14     ` Ben Peart
2018-07-27 12:59 ` [PATCH v2 0/2] Preserve skip_worktree bit in merges " Ben Peart
2018-07-27 12:59   ` [PATCH v2 1/2] t3507: add a testcase showing failure with sparse checkout Ben Peart
2018-07-27 12:59   ` Ben Peart [this message]
2018-07-27 18:14   ` [PATCH v2 0/2] Preserve skip_worktree bit in merges when necessary Junio C Hamano
2018-07-31 16:11   ` Elijah Newren

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