Subject: [PATCH v7 10/31] directory rename detection: tests for handling overwriting untracked files

From: Elijah Newren <[email-masked]>
Date: Tue, 30 Jan 2018 15:25:12 -0800

Signed-off-by: Elijah Newren <[email-masked]>
---
 t/t6043-merge-rename-directories.sh | 367 ++++++++++++++++++++++++++++++++++++
 1 file changed, 367 insertions(+)

diff --git a/t/t6043-merge-rename-directories.sh b/t/t6043-merge-rename-directories.sh
index b730256653..aa9af49edc 100755
--- a/t/t6043-merge-rename-directories.sh
+++ b/t/t6043-merge-rename-directories.sh
@@ -2871,4 +2871,371 @@ test_expect_failure '9g-check: Renamed directory that only contained immediate s
 #   side of history for any implicit directory renames.
 ###########################################################################
 
+###########################################################################
+# SECTION 10: Handling untracked files
+#
+# unpack_trees(), upon which the recursive merge algorithm is based, aborts
+# the operation if untracked or dirty files would be deleted or overwritten
+# by the merge.  Unfortunately, unpack_trees() does not understand renames,
+# and if it doesn't abort, then it muddies up the working directory before
+# we even get to the point of detecting renames, so we need some special
+# handling, at least in the case of directory renames.
+###########################################################################
+
+# Testcase 10a, Overwrite untracked: normal rename/delete
+#   Commit O: z/{b,c_1}
+#   Commit A: z/b + untracked z/c + untracked z/d
+#   Commit B: z/{b,d_1}
+#   Expected: Aborted Merge +
+#       ERROR_MSG(untracked working tree files would be overwritten by merge)
+
+test_expect_success '10a-setup: Overwrite untracked with normal rename/delete' '
+	test_create_repo 10a &&
+	(
+		cd 10a &&
+
+		mkdir z &&
+		echo b >z/b &&
+		echo c >z/c &&
+		git add z &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git rm z/c &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv z/c z/d &&
+		test_tick &&
+		git commit -m "B"
+	)
+'
+
+test_expect_success '10a-check: Overwrite untracked with normal rename/delete' '
+	(
+		cd 10a &&
+
+		git checkout A^0 &&
+		echo very >z/c &&
+		echo important >z/d &&
+
+		test_must_fail git merge -s recursive B^0 >out 2>err &&
+		test_i18ngrep "The following untracked working tree files would be overwritten by merge" err &&
+
+		git ls-files -s >out &&
+		test_line_count = 1 out &&
+		git ls-files -o >out &&
+		test_line_count = 4 out &&
+
+		echo very >expect &&
+		test_cmp expect z/c &&
+
+		echo important >expect &&
+		test_cmp expect z/d &&
+
+		git rev-parse HEAD:z/b >actual &&
+		git rev-parse O:z/b >expect &&
+		test_cmp expect actual
+	)
+'
+
+# Testcase 10b, Overwrite untracked: dir rename + delete
+#   Commit O: z/{b,c_1}
+#   Commit A: y/b + untracked y/{c,d,e}
+#   Commit B: z/{b,d_1,e}
+#   Expected: Failed Merge; y/b + untracked y/c + untracked y/d on disk +
+#             z/c_1 -> z/d_1 rename recorded at stage 3 for y/d +
+#       ERROR_MSG(refusing to lose untracked file at 'y/d')
+
+test_expect_success '10b-setup: Overwrite untracked with dir rename + delete' '
+	test_create_repo 10b &&
+	(
+		cd 10b &&
+
+		mkdir z &&
+		echo b >z/b &&
+		echo c >z/c &&
+		git add z &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git rm z/c &&
+		git mv z/ y/ &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv z/c z/d &&
+		echo e >z/e &&
+		git add z/e &&
+		test_tick &&
+		git commit -m "B"
+	)
+'
+
+test_expect_failure '10b-check: Overwrite untracked with dir rename + delete' '
+	(
+		cd 10b &&
+
+		git checkout A^0 &&
+		echo very >y/c &&
+		echo important >y/d &&
+		echo contents >y/e &&
+
+		test_must_fail git merge -s recursive B^0 >out 2>err &&
+		test_i18ngrep "CONFLICT (rename/delete).*Version B\^0 of y/d left in tree at y/d~B\^0" out &&
+		test_i18ngrep "Error: Refusing to lose untracked file at y/e; writing to y/e~B\^0 instead" out &&
+
+		git ls-files -s >out &&
+		test_line_count = 3 out &&
+		git ls-files -u >out &&
+		test_line_count = 2 out &&
+		git ls-files -o >out &&
+		test_line_count = 5 out &&
+
+		git rev-parse >actual \
+			:0:y/b :3:y/d :3:y/e &&
+		git rev-parse >expect \
+			O:z/b  O:z/c  B:z/e &&
+		test_cmp expect actual &&
+
+		echo very >expect &&
+		test_cmp expect y/c &&
+
+		echo important >expect &&
+		test_cmp expect y/d &&
+
+		echo contents >expect &&
+		test_cmp expect y/e
+	)
+'
+
+# Testcase 10c, Overwrite untracked: dir rename/rename(1to2)
+#   Commit O: z/{a,b}, x/{c,d}
+#   Commit A: y/{a,b}, w/c, x/d + different untracked y/c
+#   Commit B: z/{a,b,c}, x/d
+#   Expected: Failed Merge; y/{a,b} + x/d + untracked y/c +
+#             CONFLICT(rename/rename) x/c -> w/c vs y/c +
+#             y/c~B^0 +
+#             ERROR_MSG(Refusing to lose untracked file at y/c)
+
+test_expect_success '10c-setup: Overwrite untracked with dir rename/rename(1to2)' '
+	test_create_repo 10c &&
+	(
+		cd 10c &&
+
+		mkdir z x &&
+		echo a >z/a &&
+		echo b >z/b &&
+		echo c >x/c &&
+		echo d >x/d &&
+		git add z x &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		mkdir w &&
+		git mv x/c w/c &&
+		git mv z/ y/ &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv x/c z/ &&
+		test_tick &&
+		git commit -m "B"
+	)
+'
+
+test_expect_failure '10c-check: Overwrite untracked with dir rename/rename(1to2)' '
+	(
+		cd 10c &&
+
+		git checkout A^0 &&
+		echo important >y/c &&
+
+		test_must_fail git merge -s recursive B^0 >out 2>err &&
+		test_i18ngrep "CONFLICT (rename/rename)" out &&
+		test_i18ngrep "Refusing to lose untracked file at y/c; adding as y/c~B\^0 instead" out &&
+
+		git ls-files -s >out &&
+		test_line_count = 6 out &&
+		git ls-files -u >out &&
+		test_line_count = 3 out &&
+		git ls-files -o >out &&
+		test_line_count = 3 out &&
+
+		git rev-parse >actual \
+			:0:y/a :0:y/b :0:x/d :1:x/c :2:w/c :3:y/c &&
+		git rev-parse >expect \
+			 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  O:x/c &&
+		test_cmp expect actual &&
+
+		git hash-object y/c~B^0 >actual &&
+		git rev-parse O:x/c >expect &&
+		test_cmp expect actual &&
+
+		echo important >expect &&
+		test_cmp expect y/c
+	)
+'
+
+# Testcase 10d, Delete untracked w/ dir rename/rename(2to1)
+#   Commit O: z/{a,b,c_1},        x/{d,e,f_2}
+#   Commit A: y/{a,b},            x/{d,e,f_2,wham_1} + untracked y/wham
+#   Commit B: z/{a,b,c_1,wham_2}, y/{d,e}
+#   Expected: Failed Merge; y/{a,b,d,e} + untracked y/{wham,wham~B^0,wham~HEAD}+
+#             CONFLICT(rename/rename) z/c_1 vs x/f_2 -> y/wham
+#             ERROR_MSG(Refusing to lose untracked file at y/wham)
+
+test_expect_success '10d-setup: Delete untracked with dir rename/rename(2to1)' '
+	test_create_repo 10d &&
+	(
+		cd 10d &&
+
+		mkdir z x &&
+		echo a >z/a &&
+		echo b >z/b &&
+		echo c >z/c &&
+		echo d >x/d &&
+		echo e >x/e &&
+		echo f >x/f &&
+		git add z x &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git mv z/c x/wham &&
+		git mv z/ y/ &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv x/f z/wham &&
+		git mv x/ y/ &&
+		test_tick &&
+		git commit -m "B"
+	)
+'
+
+test_expect_failure '10d-check: Delete untracked with dir rename/rename(2to1)' '
+	(
+		cd 10d &&
+
+		git checkout A^0 &&
+		echo important >y/wham &&
+
+		test_must_fail git merge -s recursive B^0 >out 2>err &&
+		test_i18ngrep "CONFLICT (rename/rename)" out &&
+		test_i18ngrep "Refusing to lose untracked file at y/wham" out &&
+
+		git ls-files -s >out &&
+		test_line_count = 6 out &&
+		git ls-files -u >out &&
+		test_line_count = 2 out &&
+		git ls-files -o >out &&
+		test_line_count = 4 out &&
+
+		git rev-parse >actual \
+			:0:y/a :0:y/b :0:y/d :0:y/e :2:y/wham :3:y/wham &&
+		git rev-parse >expect \
+			 O:z/a  O:z/b  O:x/d  O:x/e  O:z/c     O:x/f &&
+		test_cmp expect actual &&
+
+		test_must_fail git rev-parse :1:y/wham &&
+
+		echo important >expect &&
+		test_cmp expect y/wham &&
+
+		git hash-object >actual \
+			y/wham~B^0 y/wham~HEAD &&
+		git rev-parse >expect \
+			O:x/f      O:z/c &&
+		test_cmp expect actual
+	)
+'
+
+# Testcase 10e, Does git complain about untracked file that's not in the way?
+#   Commit O: z/{a,b}
+#   Commit A: y/{a,b} + untracked z/c
+#   Commit B: z/{a,b,c}
+#   Expected: y/{a,b,c} + untracked z/c
+
+test_expect_success '10e-setup: Does git complain about untracked file that is not really in the way?' '
+	test_create_repo 10e &&
+	(
+		cd 10e &&
+
+		mkdir z &&
+		echo a >z/a &&
+		echo b >z/b &&
+		git add z &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git mv z/ y/ &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		echo c >z/c &&
+		git add z/c &&
+		test_tick &&
+		git commit -m "B"
+	)
+'
+
+test_expect_failure '10e-check: Does git complain about untracked file that is not really in the way?' '
+	(
+		cd 10e &&
+
+		git checkout A^0 &&
+		mkdir z &&
+		echo random >z/c &&
+
+		git merge -s recursive B^0 >out 2>err &&
+		test_i18ngrep ! "following untracked working tree files would be overwritten by merge" err &&
+
+		git ls-files -s >out &&
+		test_line_count = 3 out &&
+		git ls-files -u >out &&
+		test_line_count = 0 out &&
+		git ls-files -o >out &&
+		test_line_count = 3 out &&
+
+		git rev-parse >actual \
+			:0:y/a :0:y/b :0:y/c &&
+		git rev-parse >expect \
+			 O:z/a  O:z/b  B:z/c &&
+		test_cmp expect actual &&
+
+		echo random >expect &&
+		test_cmp expect z/c
+	)
+'
+
 test_done
-- 
2.16.1.106.gf69932adfe