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From: "Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Elijah Newren <newren@gmail.com>, Elijah Newren <newren@gmail.com>
Subject: [PATCH 1/3] t6423: test directory renames causing rename-to-self
Date: Sat, 26 Jun 2021 17:05:19 +0000	[thread overview]
Message-ID: <d3572e8bc85e4c7a33094f5da71957c2e59fd7f4.1624727121.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1039.git.git.1624727121.gitgitgadget@gmail.com>

From: Elijah Newren <newren@gmail.com>

Directory rename detection can cause transitive renames, e.g. if the two
different sides of history each do one half of:
    A/file -> B/file
    B/     -> C/
then directory rename detection transitively renames to give us C/file.
Since the default for merge.directoryRenames is conflict, this results
in an error message saying it is unclear whether the file should be
placed at B/file or C/file.

What if C/ is A/, though?  In such a case, the transitive rename would
give us A/file, the original name we started with.  Logically, having
an error message with B/file vs. A/file should be fine, as should
leaving the file where it started.  But the logic in both
merge-recursive and merge-ort did not handle a case of a filename being
renamed to itself correctly; merge-recursive had two bugs, and merge-ort
had one.  Add some testcases covering such a scenario.

Based-on-testcase-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Elijah Newren <newren@gmail.com>
---
 t/t6423-merge-rename-directories.sh | 117 ++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)

diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh
index be84d22419d..2a2ab907338 100755
--- a/t/t6423-merge-rename-directories.sh
+++ b/t/t6423-merge-rename-directories.sh
@@ -5024,6 +5024,123 @@ test_expect_failure '12h: renaming a file within a renamed directory' '
 	)
 '
 
+# Testcase 12i, Directory rename causes rename-to-self
+#   Commit O: source/{subdir/foo, bar, baz_1}
+#   Commit A: source/{foo, bar, baz_1}
+#   Commit B: source/{subdir/{foo, bar}, baz_2}
+#   Expected: source/{foo, bar, baz_2}, with conflicts on
+#                source/bar vs. source/subdir/bar
+
+test_setup_12i () {
+	test_create_repo 12i &&
+	(
+		cd 12i &&
+
+		mkdir -p source/subdir &&
+		echo foo >source/subdir/foo &&
+		echo bar >source/bar &&
+		echo baz >source/baz &&
+		git add source &&
+		git commit -m orig &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		git mv source/subdir/foo source/foo &&
+		git commit -m A &&
+
+		git switch B &&
+		git mv source/bar source/subdir/bar &&
+		echo more baz >>source/baz &&
+		git commit -m B
+	)
+}
+
+test_expect_merge_algorithm failure failure '12i: Directory rename causes rename-to-self' '
+	test_setup_12i &&
+	(
+		cd 12i &&
+
+		git checkout A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=conflict merge -s recursive B^0 &&
+
+		test_path_is_missing source/subdir &&
+		test_path_is_file source/bar &&
+		test_path_is_file source/baz &&
+
+		git ls-files | uniq >tracked &&
+		test_line_count = 3 tracked &&
+
+		git status --porcelain -uno >actual &&
+		cat >expect <<-\EOF &&
+		UU source/bar
+		 M source/baz
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12j, Directory rename to root causes rename-to-self
+#   Commit O: {subdir/foo, bar, baz_1}
+#   Commit A: {foo, bar, baz_1}
+#   Commit B: {subdir/{foo, bar}, baz_2}
+#   Expected: {foo, bar, baz_2}, with conflicts on bar vs. subdir/bar
+
+test_setup_12j () {
+	test_create_repo 12j &&
+	(
+		cd 12j &&
+
+		mkdir -p subdir &&
+		echo foo >subdir/foo &&
+		echo bar >bar &&
+		echo baz >baz &&
+		git add . &&
+		git commit -m orig &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		git mv subdir/foo foo &&
+		git commit -m A &&
+
+		git switch B &&
+		git mv bar subdir/bar &&
+		echo more baz >>baz &&
+		git commit -m B
+	)
+}
+
+test_expect_merge_algorithm failure failure '12j: Directory rename to root causes rename-to-self' '
+	test_setup_12j &&
+	(
+		cd 12j &&
+
+		git checkout A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=conflict merge -s recursive B^0 &&
+
+		test_path_is_missing subdir &&
+		test_path_is_file bar &&
+		test_path_is_file baz &&
+
+		git ls-files | uniq >tracked &&
+		test_line_count = 3 tracked &&
+
+		git status --porcelain -uno >actual &&
+		cat >expect <<-\EOF &&
+		UU bar
+		 M baz
+		EOF
+		test_cmp expect actual
+	)
+'
+
 ###########################################################################
 # SECTION 13: Checking informational and conflict messages
 #
-- 
gitgitgadget


  reply	other threads:[~2021-06-26 17:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-26 17:05 [PATCH 0/3] Fix bugs from interesting renaming pairs: one side renames A/file -> B/file, the other B/ -> A/ Elijah Newren via GitGitGadget
2021-06-26 17:05 ` Elijah Newren via GitGitGadget [this message]
2021-06-29 12:50   ` [PATCH 1/3] t6423: test directory renames causing rename-to-self Derrick Stolee
2021-06-30 16:33     ` Elijah Newren
2021-06-26 17:05 ` [PATCH 2/3] merge-ort: ensure we consult df_conflict and path_conflicts Elijah Newren via GitGitGadget
2021-06-26 17:05 ` [PATCH 3/3] merge-recursive: handle rename-to-self case Elijah Newren via GitGitGadget
2021-06-29  4:02   ` Junio C Hamano
2021-06-29 12:55     ` Derrick Stolee
2021-06-30 17:29 ` [PATCH v2 0/3] Fix bugs from interesting renaming pairs: one side renames A/file -> B/file, the other B/ -> A/ Elijah Newren via GitGitGadget
2021-06-30 17:29   ` [PATCH v2 1/3] t6423: test directory renames causing rename-to-self Elijah Newren via GitGitGadget
2021-06-30 17:29   ` [PATCH v2 2/3] merge-ort: ensure we consult df_conflict and path_conflicts Elijah Newren via GitGitGadget
2021-06-30 17:30   ` [PATCH v2 3/3] merge-recursive: handle rename-to-self case Elijah Newren via GitGitGadget

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