From: Elijah Newren <newren@gmail.com>
To: git@vger.kernel.org
Cc: sbeller@google.com, gitster@pobox.com, Elijah Newren <newren@gmail.com>
Subject: [PATCH v2 10/33] directory rename detection: more involved edge/corner testcases
Date: Mon, 20 Nov 2017 14:01:46 -0800 [thread overview]
Message-ID: <20171120220209.15111-11-newren@gmail.com> (raw)
In-Reply-To: <20171120220209.15111-1-newren@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
---
t/t6043-merge-rename-directories.sh | 381 ++++++++++++++++++++++++++++++++++++
1 file changed, 381 insertions(+)
diff --git a/t/t6043-merge-rename-directories.sh b/t/t6043-merge-rename-directories.sh
index 5db2986de8..2c57a02c6d 100755
--- a/t/t6043-merge-rename-directories.sh
+++ b/t/t6043-merge-rename-directories.sh
@@ -1459,4 +1459,385 @@ test_expect_success '6e-check: Add/add from one side' '
# side of history is the one doing the renaming.
###########################################################################
+
+###########################################################################
+# SECTION 7: More involved Edge/Corner cases
+#
+# The ruleset we have generated in the above sections seems to provide
+# well-defined merges. But can we find edge/corner cases that either (a)
+# are harder for users to understand, or (b) have a resolution that is
+# non-intuitive or suboptimal?
+#
+# The testcases in this section dive into cases that I've tried to craft in
+# a way to find some that might be surprising to users or difficult for
+# them to understand (the next section will look at non-intuitive or
+# suboptimal merge results). Some of the testcases are similar to ones
+# from past sections, but have been simplified to try to highlight error
+# messages using a "modified" path (due to the directory rename). Are
+# users okay with these?
+#
+# In my opinion, testcases that are difficult to understand from this
+# section is due to difficulty in the testcase rather than the directory
+# renaming (similar to how t6042 and t6036 have difficult resolutions due
+# to the problem setup itself being complex). And I don't think the
+# error messages are a problem.
+#
+# On the other hand, the testcases in section 8 worry me slightly more...
+###########################################################################
+
+# Testcase 7a, rename-dir vs. rename-dir (NOT split evenly) PLUS add-other-file
+# Commit O: z/{b,c}
+# Commit A: y/{b,c}
+# Commit B: w/b, x/c, z/d
+# Expected: y/d, CONFLICT(rename/rename for both z/b and z/c)
+# NOTE: There's a rename of z/ here, y/ has more renames, so z/d -> y/d.
+
+test_expect_success '7a-setup: rename-dir vs. rename-dir (NOT split evenly) PLUS add-other-file' '
+ test_create_repo 7a &&
+ (
+ cd 7a &&
+
+ 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 mv z y &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ mkdir w &&
+ mkdir x &&
+ git mv z/b w/ &&
+ git mv z/c x/ &&
+ echo d > z/d &&
+ git add z/d &&
+ test_tick &&
+ git commit -m "B"
+ )
+'
+
+test_expect_failure '7a-check: rename-dir vs. rename-dir (NOT split evenly) PLUS add-other-file' '
+ (
+ cd 7a &&
+
+ git checkout A^0 &&
+
+ test_must_fail git merge -s recursive B^0 >out &&
+ test_i18ngrep "CONFLICT (rename/rename).*z/b.*y/b.*w/b" out &&
+ test_i18ngrep "CONFLICT (rename/rename).*z/c.*y/c.*x/c" out &&
+
+ test 7 -eq $(git ls-files -s | wc -l) &&
+ test 6 -eq $(git ls-files -u | wc -l) &&
+ test 1 -eq $(git ls-files -o | wc -l) &&
+
+ test $(git rev-parse :0:y/d) = $(git rev-parse B:z/d) &&
+
+ git rev-parse >actual \
+ :1:z/b :2:y/b :3:w/b :1:z/c :2:y/c :3:x/c &&
+ git rev-parse >expect \
+ O:z/b O:z/b O:z/b O:z/c O:z/c O:z/c &&
+ test_cmp expect actual &&
+
+ git hash-object >actual \
+ y/b w/b y/c x/c &&
+ git rev-parse >expect \
+ O:z/b O:z/b O:z/c O:z/c &&
+ test_cmp expect actual
+ )
+'
+
+# Testcase 7b, rename/rename(2to1), but only due to transitive rename
+# (Related to testcase 1d)
+# Commit O: z/{b,c}, x/d_1, w/d_2
+# Commit A: y/{b,c,d_2}, x/d_1
+# Commit B: z/{b,c,d_1}, w/d_2
+# Expected: y/{b,c}, CONFLICT(rename/rename(2to1): x/d_1, w/d_2 -> y_d)
+
+test_expect_success '7b-setup: rename/rename(2to1), but only due to transitive rename' '
+ test_create_repo 7b &&
+ (
+ cd 7b &&
+
+ mkdir z &&
+ mkdir x &&
+ mkdir w &&
+ echo b >z/b &&
+ echo c >z/c &&
+ echo d1 > x/d &&
+ echo d2 > w/d &&
+ git add z x w &&
+ test_tick &&
+ git commit -m "O" &&
+
+ git branch O &&
+ git branch A &&
+ git branch B &&
+
+ git checkout A &&
+ git mv z y &&
+ git mv w/d y/ &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ git mv x/d z/ &&
+ rmdir x &&
+ test_tick &&
+ git commit -m "B"
+ )
+'
+
+test_expect_failure '7b-check: rename/rename(2to1), but only due to transitive rename' '
+ (
+ cd 7b &&
+
+ git checkout A^0 &&
+
+ test_must_fail git merge -s recursive B^0 >out &&
+ test_i18ngrep "CONFLICT (rename/rename)" out &&
+
+ test 4 -eq $(git ls-files -s | wc -l) &&
+ test 2 -eq $(git ls-files -u | wc -l) &&
+ test 3 -eq $(git ls-files -o | wc -l) &&
+
+ git rev-parse >actual \
+ :0:y/b :0:y/c :2:y/d :3:y/d &&
+ git rev-parse >expect \
+ O:z/b O:z/c O:w/d O:x/d &&
+ test_cmp expect actual &&
+
+ test ! -f y/d &&
+ test -f y/d~HEAD &&
+ test -f y/d~B^0 &&
+
+ git hash-object >actual \
+ y/d~HEAD y/d~B^0 &&
+ git rev-parse >expect \
+ O:w/d O:x/d &&
+ test_cmp expect actual
+ )
+'
+
+# Testcase 7c, rename/rename(1to...2or3); transitive rename may add complexity
+# (Related to testcases 3b and 5c)
+# Commit O: z/{b,c}, x/d
+# Commit A: y/{b,c}, w/d
+# Commit B: z/{b,c,d}
+# Expected: y/{b,c}, CONFLICT(x/d -> w/d vs. y/d)
+# NOTE: z/ was renamed to y/ so we do want to report
+# neither CONFLICT(x/d -> w/d vs. z/d)
+# nor CONFLiCT x/d -> w/d vs. y/d vs. z/d)
+
+test_expect_success '7c-setup: rename/rename(1to...2or3); transitive rename may add complexity' '
+ test_create_repo 7c &&
+ (
+ cd 7c &&
+
+ mkdir z &&
+ echo b >z/b &&
+ echo c >z/c &&
+ mkdir x &&
+ 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 &&
+ git mv z y &&
+ git mv x w &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ git mv x/d z/ &&
+ rmdir x &&
+ test_tick &&
+ git commit -m "B"
+ )
+'
+
+test_expect_failure '7c-check: rename/rename(1to...2or3); transitive rename may add complexity' '
+ (
+ cd 7c &&
+
+ git checkout A^0 &&
+
+ test_must_fail git merge -s recursive B^0 >out &&
+ test_i18ngrep "CONFLICT (rename/rename).*x/d.*w/d.*y/d" out &&
+
+ test 5 -eq $(git ls-files -s | wc -l) &&
+ test 3 -eq $(git ls-files -u | wc -l) &&
+ test 1 -eq $(git ls-files -o | wc -l) &&
+
+ git rev-parse >actual \
+ :0:y/b :0:y/c :1:x/d :2:w/d :3:y/d &&
+ git rev-parse >expect \
+ O:z/b O:z/c O:x/d O:x/d O:x/d &&
+ test_cmp expect actual
+ )
+'
+
+# Testcase 7d, transitive rename involved in rename/delete; how is it reported?
+# (Related somewhat to testcases 5b and 8d)
+# Commit O: z/{b,c}, x/d
+# Commit A: y/{b,c}
+# Commit B: z/{b,c,d}
+# Expected: y/{b,c}, CONFLICT(delete x/d vs rename to y/d)
+# NOTE: z->y so NOT CONFLICT(delete x/d vs rename to z/d)
+
+test_expect_success '7d-setup: transitive rename involved in rename/delete; how is it reported?' '
+ test_create_repo 7d &&
+ (
+ cd 7d &&
+
+ mkdir z &&
+ echo b >z/b &&
+ echo c >z/c &&
+ mkdir x &&
+ 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 &&
+ git mv z y &&
+ git rm -rf x &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ git mv x/d z/ &&
+ rmdir x &&
+ test_tick &&
+ git commit -m "B"
+ )
+'
+
+test_expect_failure '7d-check: transitive rename involved in rename/delete; how is it reported?' '
+ (
+ cd 7d &&
+
+ git checkout A^0 &&
+
+ test_must_fail git merge -s recursive B^0 >out &&
+ test_i18ngrep "CONFLICT (rename/delete).*x/d.*y/d" out &&
+
+ test 3 -eq $(git ls-files -s | wc -l) &&
+ test 1 -eq $(git ls-files -u | wc -l) &&
+ test 1 -eq $(git ls-files -o | wc -l) &&
+
+ git rev-parse >actual \
+ :0:y/b :0:y/c :3:y/d &&
+ git rev-parse >expect \
+ O:z/b O:z/c O:x/d &&
+ test_cmp expect actual
+ )
+'
+
+# Testcase 7e, transitive rename in rename/delete AND dirs in the way
+# (Very similar to 'both rename source and destination involved in D/F conflict' from t6022-merge-rename.sh)
+# (Also related to testcases 9c and 9d)
+# Commit O: z/{b,c}, x/d_1
+# Commit A: y/{b,c,d/g}, x/d/f
+# Commit B: z/{b,c,d_1}
+# Expected: rename/delete(x/d_1->y/d_1 vs. None) + D/F conflict on y/d
+# y/{b,c,d/g}, y/d_1~B^0, x/d/f
+
+# NOTE: The main path of interest here is d_1 and where it ends up, but
+# this is actually a case that has two potential directory renames
+# involved and D/F conflict(s), so it makes sense to walk through
+# each step.
+#
+# Commit A renames z/ -> y/. Thus everything that B adds to z/
+# should be instead moved to y/. This gives us the D/F conflict on
+# y/d because x/d_1 -> z/d_1 -> y/d_1 conflicts with y/d/g.
+#
+# Further, commit B renames x/ -> z/, thus everything A adds to x/
+# should instead be moved to z/...BUT we removed z/ and renamed it
+# to y/, so maybe everything should move not from x/ to z/, but
+# from x/ to z/ to y/. Doing so might make sense from the logic so
+# far, but note that commit A had both an x/ and a y/; it did the
+# renaming of z/ to y/ and created x/d/f and it clearly made these
+# things separate, so it doesn't make much sense to push these
+# together. Doing so is what I'd call a doubly transitive rename;
+# see testcases 9c and 9d for further discussion of this issue and
+# how it's resolved.
+
+test_expect_success '7e-setup: transitive rename in rename/delete AND dirs in the way' '
+ test_create_repo 7e &&
+ (
+ cd 7e &&
+
+ mkdir z &&
+ echo b >z/b &&
+ echo c >z/c &&
+ mkdir x &&
+ echo d1 >x/d &&
+ 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 y &&
+ git rm x/d &&
+ mkdir -p x/d &&
+ mkdir -p y/d &&
+ echo f >x/d/f &&
+ echo g >y/d/g &&
+ git add x/d/f y/d/g &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ git mv x/d z/ &&
+ rmdir x &&
+ test_tick &&
+ git commit -m "B"
+ )
+'
+
+test_expect_failure '7e-check: transitive rename in rename/delete AND dirs in the way' '
+ (
+ cd 7e &&
+
+ git checkout A^0 &&
+
+ test_must_fail git merge -s recursive B^0 >out &&
+ test_i18ngrep "CONFLICT (rename/delete).*x/d.*y/d" out &&
+
+ test 5 -eq $(git ls-files -s | wc -l) &&
+ test 1 -eq $(git ls-files -u | wc -l) &&
+ test 2 -eq $(git ls-files -o | wc -l) &&
+
+ git rev-parse >actual \
+ :0:x/d/f :0:y/d/g :0:y/b :0:y/c :3:y/d &&
+ git rev-parse >expect \
+ A:x/d/f A:y/d/g O:z/b O:z/c O:x/d &&
+ test_cmp expect actual &&
+
+ test $(git hash-object y/d~B^0) = $(git rev-parse O:x/d)
+ )
+'
+
test_done
--
2.15.0.309.g00c152f825
next prev parent reply other threads:[~2017-11-20 22:03 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-20 22:01 [PATCH v2 00/33] Add directory rename detection to git Elijah Newren
2017-11-20 22:01 ` [PATCH v2 01/33] Tighten and correct a few testcases for merging and cherry-picking Elijah Newren
2017-11-20 22:01 ` [PATCH v2 02/33] merge-recursive: fix logic ordering issue Elijah Newren
2017-11-20 22:01 ` [PATCH v2 03/33] merge-recursive: add explanation for src_entry and dst_entry Elijah Newren
2017-11-20 22:01 ` [PATCH v2 04/33] directory rename detection: basic testcases Elijah Newren
2017-11-20 22:01 ` [PATCH v2 05/33] directory rename detection: directory splitting testcases Elijah Newren
2017-11-20 22:01 ` [PATCH v2 06/33] directory rename detection: testcases to avoid taking detection too far Elijah Newren
2017-11-20 22:01 ` [PATCH v2 07/33] directory rename detection: partially renamed directory testcase/discussion Elijah Newren
2017-11-20 22:01 ` [PATCH v2 08/33] directory rename detection: files/directories in the way of some renames Elijah Newren
2017-11-20 22:01 ` [PATCH v2 09/33] directory rename detection: testcases checking which side did the rename Elijah Newren
2017-11-20 22:01 ` Elijah Newren [this message]
2017-11-20 22:01 ` [PATCH v2 11/33] directory rename detection: testcases exploring possibly suboptimal merges Elijah Newren
2017-11-20 22:01 ` [PATCH v2 12/33] directory rename detection: miscellaneous testcases to complete coverage Elijah Newren
2017-11-20 22:01 ` [PATCH v2 13/33] directory rename detection: tests for handling overwriting untracked files Elijah Newren
2017-11-20 22:01 ` [PATCH v2 14/33] directory rename detection: tests for handling overwriting dirty files Elijah Newren
2017-11-20 22:01 ` [PATCH v2 15/33] merge-recursive: move the get_renames() function Elijah Newren
2017-11-20 22:01 ` [PATCH v2 16/33] merge-recursive: introduce new functions to handle rename logic Elijah Newren
2017-11-20 22:01 ` [PATCH v2 17/33] merge-recursive: fix leaks of allocated renames and diff_filepairs Elijah Newren
2017-11-20 22:01 ` [PATCH v2 18/33] merge-recursive: make !o->detect_rename codepath more obvious Elijah Newren
2017-11-20 22:01 ` [PATCH v2 19/33] merge-recursive: split out code for determining diff_filepairs Elijah Newren
2017-11-20 22:01 ` [PATCH v2 20/33] merge-recursive: add a new hashmap for storing directory renames Elijah Newren
2017-11-20 22:01 ` [PATCH v2 21/33] merge-recursive: add get_directory_renames() Elijah Newren
2017-11-20 22:01 ` [PATCH v2 22/33] merge-recursive: check for directory level conflicts Elijah Newren
2017-11-20 22:01 ` [PATCH v2 23/33] merge-recursive: add a new hashmap for storing file collisions Elijah Newren
2017-11-20 22:02 ` [PATCH v2 24/33] merge-recursive: add computation of collisions due to dir rename & merging Elijah Newren
2017-11-20 22:02 ` [PATCH v2 25/33] merge-recursive: check for file level conflicts then get new name Elijah Newren
2017-11-20 22:02 ` [PATCH v2 26/33] merge-recursive: when comparing files, don't include trees Elijah Newren
2017-11-20 22:02 ` [PATCH v2 27/33] merge-recursive: apply necessary modifications for directory renames Elijah Newren
2017-11-20 22:02 ` [PATCH v2 28/33] merge-recursive: avoid clobbering untracked files with " Elijah Newren
2017-11-20 22:02 ` [PATCH v2 29/33] merge-recursive: fix overwriting dirty files involved in renames Elijah Newren
2017-11-20 22:02 ` [PATCH v2 30/33] merge-recursive: fix remaining directory rename + dirty overwrite cases Elijah Newren
2017-11-20 22:02 ` [PATCH v2 31/33] directory rename detection: new testcases showcasing a pair of bugs Elijah Newren
2017-11-20 22:02 ` [PATCH v2 32/33] merge-recursive: avoid spurious rename/rename conflict from dir renames Elijah Newren
2017-11-20 22:02 ` [PATCH v2 33/33] merge-recursive: ensure we write updates for directory-renamed file Elijah Newren
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