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From: "Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Christian Couder <chriscool@tuxfamily.org>,
	Taylor Blau <me@ttaylorr.com>,
	Johannes Altmanninger <aclopte@gmail.com>,
	Elijah Newren <newren@gmail.com>,
	Elijah Newren <newren@gmail.com>,
	Elijah Newren <newren@gmail.com>
Subject: [PATCH v2 8/8] merge-tree: provide an easy way to access which files have conflicts
Date: Wed, 05 Jan 2022 17:27:35 +0000	[thread overview]
Message-ID: <01364bb020ee2836016ec0e8eafa2261fb7800ab.1641403655.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1114.v2.git.git.1641403655.gitgitgadget@gmail.com>

From: Elijah Newren <newren@gmail.com>

Callers of `git merge-tree --real` might want an easy way to determine
which files conflicted.  While they could potentially use the --messages
option and parse the resulting messages written to that file, those
messages are not meant to be machine readable.  Provide a simpler
mechanism of having the user specify --unmerged-list=$FILENAME, and then
write a NUL-separated list of unmerged filenames to the specified file.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 Documentation/git-merge-tree.txt |  6 ++++--
 builtin/merge-tree.c             | 16 ++++++++++++++++
 merge-ort.c                      | 13 +++++++++++++
 merge-ort.h                      |  3 +++
 t/t4301-merge-tree-real.sh       |  9 +++++++++
 5 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-merge-tree.txt b/Documentation/git-merge-tree.txt
index 4d5857b390b..542cea1a1a8 100644
--- a/Documentation/git-merge-tree.txt
+++ b/Documentation/git-merge-tree.txt
@@ -9,7 +9,7 @@ git-merge-tree - Perform merge without touching index or working tree
 SYNOPSIS
 --------
 [verse]
-'git merge-tree' --real [--messages=<file>] <branch1> <branch2>
+'git merge-tree' --real [--messages=<file>] [--conflicted-list=<file>] <branch1> <branch2>
 'git merge-tree' <base-tree> <branch1> <branch2>
 
 DESCRIPTION
@@ -23,7 +23,9 @@ will be `0`, and if the merge has conflicts, the exit status will be
 `1`.  The output will consist solely of the resulting toplevel tree
 (which may have files including conflict markers).  With `--messages`,
 it will write any informational messages (such as "Auto-merging
-<path>" and conflict notices) to the given file.
+<path>" and conflict notices) to the given file.  With
+`--conflicted-list`, it will write a list of unmerged files, one per
+line, to the given file.
 
 The second form is meant for backward compatibility and will only do a
 trival merge.  It reads three tree-ish, and outputs trivial merge
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index 46b746b6b7c..4ae34da98b1 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -391,6 +391,7 @@ static int trivial_merge(const char *base,
 struct merge_tree_options {
 	int real;
 	char *messages_file;
+	char *conflicted_file;
 };
 
 static int real_merge(struct merge_tree_options *o,
@@ -450,6 +451,19 @@ static int real_merge(struct merge_tree_options *o,
 		merge_display_update_messages(&opt, &result, fp);
 		fclose(fp);
 	}
+	if (o->conflicted_file) {
+		struct string_list conflicted_files = STRING_LIST_INIT_NODUP;
+		FILE *fp = xfopen(o->conflicted_file, "w");
+		int i;
+
+		merge_get_conflicted_files(&result, &conflicted_files);
+		for (i = 0; i < conflicted_files.nr; i++) {
+			fprintf(fp, "%s", conflicted_files.items[i].string);
+			fputc('\0', fp);
+		}
+		fclose(fp);
+		string_list_clear(&conflicted_files, 0);
+	}
 	printf("%s\n", oid_to_hex(&result.tree->object.oid));
 
 	merge_finalize(&opt, &result);
@@ -472,6 +486,8 @@ int cmd_merge_tree(int argc, const char **argv, const char *prefix)
 			 N_("do a real merge instead of a trivial merge")),
 		OPT_STRING(0, "messages", &o.messages_file, N_("file"),
 			   N_("filename to write informational/conflict messages to")),
+		OPT_STRING(0, "conflicted-list", &o.conflicted_file, N_("file"),
+			   N_("filename to write list of unmerged files")),
 		OPT_END()
 	};
 
diff --git a/merge-ort.c b/merge-ort.c
index 86eebf39166..3d6dd1b234c 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -4234,6 +4234,19 @@ void merge_display_update_messages(struct merge_options *opt,
 	trace2_region_leave("merge", "display messages", opt->repo);
 }
 
+void merge_get_conflicted_files(struct merge_result *result,
+				struct string_list *conflicted_files)
+{
+	struct hashmap_iter iter;
+	struct strmap_entry *e;
+	struct merge_options_internal *opti = result->priv;
+
+	strmap_for_each_entry(&opti->conflicted, &iter, e) {
+		string_list_append(conflicted_files, e->key);
+	}
+	string_list_sort(conflicted_files);
+}
+
 void merge_switch_to_result(struct merge_options *opt,
 			    struct tree *head,
 			    struct merge_result *result,
diff --git a/merge-ort.h b/merge-ort.h
index 55819a57da8..165cef6616f 100644
--- a/merge-ort.h
+++ b/merge-ort.h
@@ -79,6 +79,9 @@ void merge_display_update_messages(struct merge_options *opt,
 				   struct merge_result *result,
 				   FILE *stream);
 
+void merge_get_conflicted_files(struct merge_result *result,
+				struct string_list *conflicted_files);
+
 /* Do needed cleanup when not calling merge_switch_to_result() */
 void merge_finalize(struct merge_options *opt,
 		    struct merge_result *result);
diff --git a/t/t4301-merge-tree-real.sh b/t/t4301-merge-tree-real.sh
index 5f3f27f504d..ec7bd8efd06 100755
--- a/t/t4301-merge-tree-real.sh
+++ b/t/t4301-merge-tree-real.sh
@@ -96,4 +96,13 @@ test_expect_success '--messages gives us the conflict notices and such' '
 	test_cmp expect MSG_FILE
 '
 
+test_expect_success '--messages gives us the conflict notices and such' '
+	test_must_fail git merge-tree --real --conflicted-list=UNMERGED side1 side2 &&
+
+	cat UNMERGED | tr "\0" "\n" >actual &&
+	test_write_lines greeting whatever~side1 >expect &&
+
+	test_cmp expect actual
+'
+
 test_done
-- 
gitgitgadget

  parent reply	other threads:[~2022-01-05 17:28 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-31  5:03 [PATCH 0/8] RFC: Server side merges (no ref updating, no commit creating, no touching worktree or index) Elijah Newren via GitGitGadget
2021-12-31  5:03 ` [PATCH 1/8] merge-tree: rename merge_trees() to trivial_merge_trees() Elijah Newren via GitGitGadget
2021-12-31  5:03 ` [PATCH 2/8] merge-tree: move logic for existing merge into new function Elijah Newren via GitGitGadget
2022-01-01 20:11   ` Johannes Altmanninger
2022-01-01 20:17     ` Elijah Newren
2021-12-31  5:03 ` [PATCH 3/8] merge-tree: add option parsing and initial shell for real merge function Elijah Newren via GitGitGadget
2021-12-31  5:04 ` [PATCH 4/8] merge-tree: implement real merges Elijah Newren via GitGitGadget
2022-01-01 20:08   ` Johannes Altmanninger
2022-01-01 21:11     ` Elijah Newren
2022-01-03 12:23   ` Fabian Stelzer
2022-01-03 16:37     ` Elijah Newren
2021-12-31  5:04 ` [PATCH 5/8] merge-ort: split out a separate display_update_messages() function Elijah Newren via GitGitGadget
2022-01-03 12:15   ` Fabian Stelzer
2022-01-03 12:25     ` Fabian Stelzer
2021-12-31  5:04 ` [PATCH 6/8] merge-ort: allow update messages to be written to different file stream Elijah Newren via GitGitGadget
2022-01-01 20:08   ` Johannes Altmanninger
2022-01-01 20:19     ` Elijah Newren
2021-12-31  5:04 ` [PATCH 7/8] merge-tree: support saving merge messages to a separate file Elijah Newren via GitGitGadget
2022-01-03 12:31   ` Fabian Stelzer
2022-01-03 16:51     ` Elijah Newren
2022-01-03 17:22       ` Fabian Stelzer
2022-01-03 19:46         ` Elijah Newren
2022-01-04 13:05           ` Fabian Stelzer
2022-01-03 12:35   ` Fabian Stelzer
2022-01-03 16:55     ` Elijah Newren
2021-12-31  5:04 ` [PATCH 8/8] merge-tree: provide an easy way to access which files have conflicts Elijah Newren via GitGitGadget
2022-01-05 17:27 ` [PATCH v2 0/8] RFC: Server side merges (no ref updating, no commit creating, no touching worktree or index) Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 1/8] merge-tree: rename merge_trees() to trivial_merge_trees() Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 2/8] merge-tree: move logic for existing merge into new function Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 3/8] merge-tree: add option parsing and initial shell for real merge function Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 4/8] merge-tree: implement real merges Elijah Newren via GitGitGadget
2022-01-07 15:30     ` Johannes Schindelin
2022-01-07 17:26       ` Elijah Newren
2022-01-07 18:22         ` Johannes Schindelin
2022-01-07 19:15           ` Elijah Newren
2022-01-07 20:56         ` Junio C Hamano
2022-01-11 13:39           ` Johannes Schindelin
2022-01-07 18:12     ` Christian Couder
2022-01-07 19:09       ` Elijah Newren
2022-01-05 17:27   ` [PATCH v2 5/8] merge-ort: split out a separate display_update_messages() function Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 6/8] merge-ort: allow update messages to be written to different file stream Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 7/8] merge-tree: support saving merge messages to a separate file Elijah Newren via GitGitGadget
2022-01-07 18:07     ` Johannes Schindelin
2022-01-08  1:02       ` Elijah Newren
2022-01-05 17:27   ` Elijah Newren via GitGitGadget [this message]
2022-01-05 19:09     ` [PATCH v2 8/8] merge-tree: provide an easy way to access which files have conflicts Ramsay Jones
2022-01-05 19:17       ` Elijah Newren
2022-01-07 19:36     ` Johannes Schindelin
2022-01-07 22:12       ` Elijah Newren
2022-02-22 13:03         ` Johannes Schindelin
2022-01-08  1:28       ` Elijah Newren
2022-02-22 13:05         ` Johannes Schindelin
2022-01-05 20:18   ` [PATCH v2 0/8] RFC: Server side merges (no ref updating, no commit creating, no touching worktree or index) Junio C Hamano
2022-01-05 22:35     ` Elijah Newren
2022-01-07 18:46   ` Christian Couder
2022-01-07 19:59     ` Elijah Newren
2022-01-07 21:26       ` René Scharfe

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