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From: Elijah Newren <newren@gmail.com>
To: git@vger.kernel.org
Cc: Elijah Newren <newren@gmail.com>
Subject: [PATCH v2 08/20] merge-ort: compute a few more useful fields for collect_merge_info
Date: Mon,  2 Nov 2020 12:43:32 -0800
Message-ID: <20201102204344.342633-9-newren@gmail.com> (raw)
In-Reply-To: <20201102204344.342633-1-newren@gmail.com>

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/merge-ort.c b/merge-ort.c
index d3c1d00fc6..0ff90981cf 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -96,6 +96,7 @@ static int collect_merge_info_callback(int n,
 	size_t len;
 	char *fullpath;
 	unsigned filemask = mask & ~dirmask;
+	unsigned match_mask = 0; /* will be updated below */
 	unsigned mbase_null = !(mask & 1);
 	unsigned side1_null = !(mask & 2);
 	unsigned side2_null = !(mask & 4);
@@ -108,6 +109,13 @@ static int collect_merge_info_callback(int n,
 	unsigned sides_match = (!side1_null && !side2_null &&
 				names[1].mode == names[2].mode &&
 				oideq(&names[1].oid, &names[2].oid));
+	/*
+	 * Note: We only label files with df_conflict, not directories.
+	 * Since directories stay where they are, and files move out of the
+	 * way to make room for a directory, we don't care if there was a
+	 * directory/file conflict for a parent directory of the current path.
+	 */
+	unsigned df_conflict = (filemask != 0) && (dirmask != 0);
 
 	/* n = 3 is a fundamental assumption. */
 	if (n != 3)
@@ -127,6 +135,14 @@ static int collect_merge_info_callback(int n,
 	/* Other invariant checks, mostly for documentation purposes. */
 	assert(mask == (dirmask | filemask));
 
+	/* Determine match_mask */
+	if (side1_matches_mbase)
+		match_mask = (side2_matches_mbase ? 7 : 3);
+	else if (side2_matches_mbase)
+		match_mask = 5;
+	else if (sides_match)
+		match_mask = 6;
+
 	/*
 	 * Get the name of the relevant filepath, which we'll pass to
 	 * setup_path_info() for tracking.
@@ -145,6 +161,8 @@ static int collect_merge_info_callback(int n,
 	 * so we can resolve later in process_entries.
 	 */
 	ci = xcalloc(1, sizeof(struct conflict_info));
+	ci->df_conflict = df_conflict;
+	ci->match_mask = match_mask;
 	strmap_put(&opti->paths, fullpath, ci);
 
 	/* If dirmask, recurse into subdirectories */
@@ -161,6 +179,13 @@ static int collect_merge_info_callback(int n,
 		newinfo.name = p->path;
 		newinfo.namelen = p->pathlen;
 		newinfo.pathlen = st_add3(newinfo.pathlen, p->pathlen, 1);
+		/*
+		 * If we did care about parent directories having a D/F
+		 * conflict, then we'd include
+		 *    newinfo.df_conflicts |= (mask & ~dirmask);
+		 * here.  But we don't.  (See comment near setting of local
+		 * df_conflict variable near the beginning of this function).
+		 */
 
 		for (i = 0; i < 3; i++, dirmask >>= 1) {
 			if (i == 1 && side1_matches_mbase)
-- 
2.29.0.471.ga4f56089c0


  parent reply index

Thread overview: 84+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-02 20:43 [PATCH v2 00/20] fundamentals of merge-ort implementation Elijah Newren
2020-11-02 20:43 ` [PATCH v2 01/20] merge-ort: setup basic internal data structures Elijah Newren
2020-11-06 22:05   ` Jonathan Tan
2020-11-06 22:45     ` Elijah Newren
2020-11-09 20:55       ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 02/20] merge-ort: add some high-level algorithm structure Elijah Newren
2020-11-02 20:43 ` [PATCH v2 03/20] merge-ort: port merge_start() from merge-recursive Elijah Newren
2020-11-11 13:52   ` Derrick Stolee
2020-11-11 16:22     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 04/20] merge-ort: use histogram diff Elijah Newren
2020-11-11 13:54   ` Derrick Stolee
2020-11-11 16:47     ` Elijah Newren
2020-11-11 16:51       ` Derrick Stolee
2020-11-11 17:03         ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 05/20] merge-ort: add an err() function similar to one from merge-recursive Elijah Newren
2020-11-11 13:58   ` Derrick Stolee
2020-11-11 17:07     ` Elijah Newren
2020-11-11 17:10       ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren
2020-11-06 22:19   ` Jonathan Tan
2020-11-06 23:10     ` Elijah Newren
2020-11-09 20:59       ` Jonathan Tan
2020-11-11 14:38   ` Derrick Stolee
2020-11-11 17:02     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 07/20] merge-ort: avoid repeating fill_tree_descriptor() on the same tree Elijah Newren
2020-11-11 14:51   ` Derrick Stolee
2020-11-11 17:13     ` Elijah Newren
2020-11-11 17:21       ` Eric Sunshine
2020-11-02 20:43 ` Elijah Newren [this message]
2020-11-06 22:52   ` [PATCH v2 08/20] merge-ort: compute a few more useful fields for collect_merge_info Jonathan Tan
2020-11-06 23:41     ` Elijah Newren
2020-11-09 22:04       ` Jonathan Tan
2020-11-09 23:05         ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren
2020-11-06 22:58   ` Jonathan Tan
2020-11-07  0:26     ` Elijah Newren
2020-11-09 22:09       ` Jonathan Tan
2020-11-09 23:08         ` Elijah Newren
2020-11-11 15:26   ` Derrick Stolee
2020-11-11 18:16     ` Elijah Newren
2020-11-11 22:06       ` Elijah Newren
2020-11-12 18:23         ` Derrick Stolee
2020-11-12 18:39       ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 10/20] merge-ort: avoid recursing into identical trees Elijah Newren
2020-11-11 15:31   ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 11/20] merge-ort: add a preliminary simple process_entries() implementation Elijah Newren
2020-11-11 19:51   ` Jonathan Tan
2020-11-12  1:48     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 12/20] merge-ort: have process_entries operate in a defined order Elijah Newren
2020-11-11 16:09   ` Derrick Stolee
2020-11-11 18:58     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 13/20] merge-ort: step 1 of tree writing -- record basenames, modes, and oids Elijah Newren
2020-11-11 20:01   ` Jonathan Tan
2020-11-11 20:24     ` Elijah Newren
2020-11-12 20:39       ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 14/20] merge-ort: step 2 of tree writing -- function to create tree object Elijah Newren
2020-11-11 20:47   ` Jonathan Tan
2020-11-11 21:21     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 15/20] merge-ort: step 3 of tree writing -- handling subdirectories as we go Elijah Newren
2020-11-12 20:15   ` Jonathan Tan
2020-11-12 22:30     ` Elijah Newren
2020-11-24 20:19       ` Elijah Newren
2020-11-25  2:07         ` Jonathan Tan
2020-11-26 18:13           ` Elijah Newren
2020-11-30 18:41             ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 16/20] merge-ort: basic outline for merge_switch_to_result() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 17/20] merge-ort: add implementation of checkout() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 18/20] tree: enable cmp_cache_name_compare() to be used elsewhere Elijah Newren
2020-11-02 20:43 ` [PATCH v2 19/20] merge-ort: add implementation of record_unmerged_index_entries() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 20/20] merge-ort: free data structures in merge_finalize() Elijah Newren
2020-11-03 14:49 ` [PATCH v2 00/20] fundamentals of merge-ort implementation Derrick Stolee
2020-11-03 16:36   ` Elijah Newren
2020-11-07  6:06     ` Elijah Newren
2020-11-07 15:02       ` Derrick Stolee
2020-11-07 19:39         ` Elijah Newren
2020-11-09 12:30           ` Derrick Stolee
2020-11-09 17:13             ` Elijah Newren
2020-11-09 19:51               ` Derrick Stolee
2020-11-09 22:44                 ` Elijah Newren
2020-11-11 17:08 ` Derrick Stolee
2020-11-11 18:35   ` Elijah Newren
2020-11-11 20:48     ` Derrick Stolee
2020-11-11 21:18       ` Elijah Newren
2020-11-29  7:43 [PATCH " Elijah Newren via GitGitGadget
2020-12-04 20:47 ` [PATCH v2 " Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 08/20] merge-ort: compute a few more useful fields for collect_merge_info Elijah Newren via GitGitGadget

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