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From: "Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: jonathantanmy@google.com, dstolee@microsoft.com,
	"Elijah Newren" <newren@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Elijah Newren" <newren@gmail.com>,
	"Elijah Newren" <newren@gmail.com>
Subject: [PATCH v2 08/20] merge-ort: compute a few more useful fields for collect_merge_info
Date: Fri, 04 Dec 2020 20:47:58 +0000	[thread overview]
Message-ID: <93fd69fa3c6095ea65b55c76c3357ccf642b1ca2.1607114891.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.923.v2.git.git.1607114890.gitgitgadget@gmail.com>

From: Elijah Newren <newren@gmail.com>

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/merge-ort.c b/merge-ort.c
index ab3119d2d8..b4e4c1f157 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -193,6 +193,7 @@ 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);
@@ -206,6 +207,22 @@ static int collect_merge_info_callback(int n,
 				names[1].mode == names[2].mode &&
 				oideq(&names[1].oid, &names[2].oid));
 
+	/*
+	 * Note: When a path is a file on one side of history and a directory
+	 * in another, we have a directory/file conflict.  In such cases, if
+	 * the conflict doesn't resolve from renames and deletions, then we
+	 * always leave directories where they are and move files out of the
+	 * way.  Thus, while struct conflict_info has a df_conflict field to
+	 * track such conflicts, we ignore that field for any directories at
+	 * a path and only pay attention to it for files at the given path.
+	 * The fact that we leave directories were they are also means that
+	 * we do not need to worry about getting additional df_conflict
+	 * information propagated from parent directories down to children
+	 * (unlike, say traverse_trees_recursive() in unpack-trees.c, which
+	 * sets a newinfo.df_conflicts field specifically to propagate it).
+	 */
+	unsigned df_conflict = (filemask != 0) && (dirmask != 0);
+
 	/* n = 3 is a fundamental assumption. */
 	if (n != 3)
 		BUG("Called collect_merge_info_callback wrong");
@@ -221,6 +238,14 @@ static int collect_merge_info_callback(int n,
 	assert(!mbase_null || !side1_null || !side2_null);
 	assert(mask > 0 && mask < 8);
 
+	/* 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.
@@ -239,6 +264,8 @@ 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 */
@@ -255,6 +282,15 @@ 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 this directory we are about to recurse into cared about
+		 * its parent directory (the current directory) having a D/F
+		 * conflict, then we'd propagate the masks in this way:
+		 *    newinfo.df_conflicts |= (mask & ~dirmask);
+		 * But we don't worry about propagating D/F conflicts.  (See
+		 * comment near setting of local df_conflict variable near
+		 * the beginning of this function).
+		 */
 
 		for (i = 0; i < 3; i++) {
 			if (i == 1 && side1_matches_mbase)
-- 
gitgitgadget


  parent reply	other threads:[~2020-12-04 20:50 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-29  7:43 [PATCH 00/20] fundamentals of merge-ort implementation Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 01/20] merge-ort: setup basic internal data structures Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 02/20] merge-ort: add some high-level algorithm structure Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 03/20] merge-ort: port merge_start() from merge-recursive Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 04/20] merge-ort: use histogram diff Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 05/20] merge-ort: add an err() function similar to one from merge-recursive Elijah Newren via GitGitGadget
2020-11-29 10:23   ` Ævar Arnfjörð Bjarmason
2020-11-30 16:56     ` Elijah Newren
2020-11-29 10:26   ` Ævar Arnfjörð Bjarmason
2020-11-29  7:43 ` [PATCH 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 07/20] merge-ort: avoid repeating fill_tree_descriptor() on the same tree Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 08/20] merge-ort: compute a few more useful fields for collect_merge_info Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 10/20] merge-ort: avoid recursing into identical trees Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 11/20] merge-ort: add a preliminary simple process_entries() implementation Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 12/20] merge-ort: have process_entries operate in a defined order Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 13/20] merge-ort: step 1 of tree writing -- record basenames, modes, and oids Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 14/20] merge-ort: step 2 of tree writing -- function to create tree object Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 15/20] merge-ort: step 3 of tree writing -- handling subdirectories as we go Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 16/20] merge-ort: basic outline for merge_switch_to_result() Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 17/20] merge-ort: add implementation of checkout() Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 18/20] tree: enable cmp_cache_name_compare() to be used elsewhere Elijah Newren via GitGitGadget
2020-11-29  7:43 ` [PATCH 19/20] merge-ort: add implementation of record_conflicted_index_entries() Elijah Newren via GitGitGadget
2020-11-29 10:20   ` Ævar Arnfjörð Bjarmason
2020-11-29  7:43 ` [PATCH 20/20] merge-ort: free data structures in merge_finalize() Elijah Newren via GitGitGadget
2020-11-29  7:47 ` [PATCH 00/20] fundamentals of merge-ort implementation Elijah Newren
2020-12-04 20:47 ` [PATCH v2 " Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 01/20] merge-ort: setup basic internal data structures Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 02/20] merge-ort: add some high-level algorithm structure Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 03/20] merge-ort: port merge_start() from merge-recursive Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 04/20] merge-ort: use histogram diff Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 05/20] merge-ort: add an err() function similar to one from merge-recursive Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 07/20] merge-ort: avoid repeating fill_tree_descriptor() on the same tree Elijah Newren via GitGitGadget
2020-12-04 20:47   ` Elijah Newren via GitGitGadget [this message]
2020-12-04 20:47   ` [PATCH v2 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 10/20] merge-ort: avoid recursing into identical trees Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 11/20] merge-ort: add a preliminary simple process_entries() implementation Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 12/20] merge-ort: have process_entries operate in a defined order Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 13/20] merge-ort: step 1 of tree writing -- record basenames, modes, and oids Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 14/20] merge-ort: step 2 of tree writing -- function to create tree object Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 15/20] merge-ort: step 3 of tree writing -- handling subdirectories as we go Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 16/20] merge-ort: basic outline for merge_switch_to_result() Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 17/20] merge-ort: add implementation of checkout() Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 18/20] tree: enable cmp_cache_name_compare() to be used elsewhere Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 19/20] merge-ort: add implementation of record_conflicted_index_entries() Elijah Newren via GitGitGadget
2020-12-04 20:48   ` [PATCH v2 20/20] merge-ort: free data structures in merge_finalize() Elijah Newren via GitGitGadget
2020-12-13  8:04   ` [PATCH v3 00/20] fundamentals of merge-ort implementation Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 01/20] merge-ort: setup basic internal data structures Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 02/20] merge-ort: add some high-level algorithm structure Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 03/20] merge-ort: port merge_start() from merge-recursive Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 04/20] merge-ort: use histogram diff Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 05/20] merge-ort: add an err() function similar to one from merge-recursive Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 07/20] merge-ort: avoid repeating fill_tree_descriptor() on the same tree Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 08/20] merge-ort: compute a few more useful fields for collect_merge_info Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 10/20] merge-ort: avoid recursing into identical trees Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 11/20] merge-ort: add a preliminary simple process_entries() implementation Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 12/20] merge-ort: have process_entries operate in a defined order Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 13/20] merge-ort: step 1 of tree writing -- record basenames, modes, and oids Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 14/20] merge-ort: step 2 of tree writing -- function to create tree object Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 15/20] merge-ort: step 3 of tree writing -- handling subdirectories as we go Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 16/20] merge-ort: basic outline for merge_switch_to_result() Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 17/20] merge-ort: add implementation of checkout() Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 18/20] tree: enable cmp_cache_name_compare() to be used elsewhere Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 19/20] merge-ort: add implementation of record_conflicted_index_entries() Elijah Newren via GitGitGadget
2020-12-13  8:04     ` [PATCH v3 20/20] merge-ort: free data structures in merge_finalize() Elijah Newren via GitGitGadget
2020-12-14 14:24     ` [PATCH v3 00/20] fundamentals of merge-ort implementation Felipe Contreras
2020-12-14 16:24       ` Elijah Newren
  -- strict thread matches above, loose matches on Subject: below --
2020-11-02 20:43 [PATCH v2 " Elijah Newren
2020-11-02 20:43 ` [PATCH v2 08/20] merge-ort: compute a few more useful fields for collect_merge_info Elijah Newren
2020-11-06 22:52   ` Jonathan Tan
2020-11-06 23:41     ` Elijah Newren
2020-11-09 22:04       ` Jonathan Tan
2020-11-09 23:05         ` Elijah Newren

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