From b9718d0cc98dcdf0012ba0bef8112068c6b2e1e4 Mon Sep 17 00:00:00 2001 From: Elijah Newren Date: Thu, 15 Oct 2020 20:46:27 +0000 Subject: directory-rename-detection.txt: update references to regression tests The regression tests for directory rename detection were renamed from t6043 to t6423 in commit 919df31955 ("Collect merge-related tests to t64xx", 2020-08-10); update this file to match. Also, add a small clarification to nearby text while we're at it. Signed-off-by: Elijah Newren Signed-off-by: Junio C Hamano --- Documentation/technical/directory-rename-detection.txt | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/Documentation/technical/directory-rename-detection.txt b/Documentation/technical/directory-rename-detection.txt index 844629c8c4..ce042cfcae 100644 --- a/Documentation/technical/directory-rename-detection.txt +++ b/Documentation/technical/directory-rename-detection.txt @@ -18,7 +18,8 @@ It is perhaps easiest to start with an example: More interesting possibilities exist, though, such as: * one side of history renames x -> z, and the other renames some file to - x/e, causing the need for the merge to do a transitive rename. + x/e, causing the need for the merge to do a transitive rename so that + the rename ends up at z/e. * one side of history renames x -> z, but also renames all files within x. For example, x/a -> z/alpha, x/b -> z/bravo, etc. @@ -35,7 +36,7 @@ More interesting possibilities exist, though, such as: directory itself contained inner directories that were renamed to yet other locations). - * combinations of the above; see t/t6043-merge-rename-directories.sh for + * combinations of the above; see t/t6423-merge-rename-directories.sh for various interesting cases. Limitations -- applicability of directory renames @@ -62,7 +63,7 @@ directory rename detection applies: Limitations -- detailed rules and testcases ------------------------------------------- -t/t6043-merge-rename-directories.sh contains extensive tests and commentary +t/t6423-merge-rename-directories.sh contains extensive tests and commentary which generate and explore the rules listed above. It also lists a few additional rules: -- cgit v1.2.3 From 902c521a35ccf479a99253918346baa9a1011c22 Mon Sep 17 00:00:00 2001 From: Elijah Newren Date: Thu, 15 Oct 2020 20:46:28 +0000 Subject: t6423: more involved directory rename test Add a new testcase modelled on a real world repository example that served multiple purposes: * it uncovered a bug in the current directory rename detection implementation. * it is a good test of needing to do directory rename detection for a series of commits instead of just one (and uses rebase instead of just merge like all the other tests in this testfile). * it is an excellent stress test for some of the optimizations in my new merge-ort engine I can expand on the final item later when I have submitted more of merge-ort, but the bug is the main immediate concern. It arises as follows: * dir/subdir/ has several files * almost all files in dir/subdir/ are renamed to folder/subdir/ * one of the files in dir/subdir/ is renamed to folder/subdir/newsubdir/ * If the other side of history (that doesn't do the renames) adds a new file to dir/subdir/, where should it be placed after the merge? The most obvious two choices are: (1) leave the new file in dir/subdir/, don't make it follow the rename, and (2) move the new file to folder/subdir/, following the rename of most the files. However, there's a possible third choice here: (3) move the new file to folder/subdir/newsubdir/. The choice reinforce the fact that merge.directoryRenames=conflict is a good default, but when the merge machinery needs to stick it somewhere and notify the user of the possibility that they might want to place it elsewhere. Surprisingly, the current code would always choose (3), while the real world repository was clearly expecting (2) -- move the file along with where the herd of files was going, not with the special exception. The problem here is that for the majority of the file renames, dir/subdir/ -> folder/subdir/ is actually represented as dir/ -> folder/ This directory rename would have a big weight associated with it since most the files followed that rename. However, we always consult the most immediate directory first, and there is only one rename rule for it: dir/subdir/ -> folder/subdir/newsubdir/ Since this rule is the only one for mapping from dir/subdir/, it automatically wins and that directory rename was followed instead of the desired dir/subdir/ -> folder/subdir/. Unfortunately, the fix is a bit involved so for now just add the testcase documenting the issue. Signed-off-by: Elijah Newren Signed-off-by: Junio C Hamano --- t/t6423-merge-rename-directories.sh | 195 ++++++++++++++++++++++++++++++++++++ 1 file changed, 195 insertions(+) diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh index f7ecbb886d..31aea47522 100755 --- a/t/t6423-merge-rename-directories.sh +++ b/t/t6423-merge-rename-directories.sh @@ -4227,6 +4227,201 @@ test_expect_success '12e: Rename/merge subdir into the root, variant 2' ' ) ' +# Testcase 12f, Rebase of patches with big directory rename +# Commit O: +# dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O} +# dir/subdir/tweaked/{f,g,h,Makefile_SUB_O} +# dir/unchanged/ +# Commit A: +# (Remove f & g, move e into newsubdir, rename dir/->folder/, modify files) +# folder/subdir/{a,b,c,d,Makefile_TOP_A} +# folder/subdir/newsubdir/e_A +# folder/subdir/tweaked/{h,Makefile_SUB_A} +# folder/unchanged/ +# Commit B1: +# (add newfile.{c,py}, modify underscored files) +# dir/{a,b,c,d,e_B1,Makefile_TOP_B1,newfile.c} +# dir/tweaked/{f,g,h,Makefile_SUB_B1,newfile.py} +# dir/unchanged/ +# Commit B2: +# (Modify e further, add newfile.rs) +# dir/{a,b,c,d,e_B2,Makefile_TOP_B1,newfile.c,newfile.rs} +# dir/tweaked/{f,g,h,Makefile_SUB_B1,newfile.py} +# dir/unchanged/ +# Expected: +# B1-picked: +# folder/subdir/{a,b,c,d,Makefile_TOP_Merge1,newfile.c} +# folder/subdir/newsubdir/e_Merge1 +# folder/subdir/tweaked/{h,Makefile_SUB_Merge1,newfile.py} +# folder/unchanged/ +# B2-picked: +# folder/subdir/{a,b,c,d,Makefile_TOP_Merge1,newfile.c,newfile.rs} +# folder/subdir/newsubdir/e_Merge2 +# folder/subdir/tweaked/{h,Makefile_SUB_Merge1,newfile.py} +# folder/unchanged/ +# +# Notes: This testcase happens to exercise lots of the +# optimization-specific codepaths in merge-ort, and also +# demonstrated a failing of the directory rename detection algorithm +# in merge-recursive; newfile.c should not get pushed into +# folder/subdir/newsubdir/, yet merge-recursive put it there because +# the rename of dir/subdir/{a,b,c,d} -> folder/subdir/{a,b,c,d} +# looks like +# dir/ -> folder/, +# whereas the rename of dir/subdir/e -> folder/subdir/newsubdir/e +# looks like +# dir/subdir/ -> folder/subdir/newsubdir/ +# and if we note that newfile.c is found in dir/subdir/, we might +# overlook the dir/ -> folder/ rule that has more weight. + +test_setup_12f () { + test_create_repo 12f && + ( + cd 12f && + + mkdir -p dir/unchanged && + mkdir -p dir/subdir/tweaked && + echo a >dir/subdir/a && + echo b >dir/subdir/b && + echo c >dir/subdir/c && + echo d >dir/subdir/d && + test_seq 1 10 >dir/subdir/e && + test_seq 10 20 >dir/subdir/Makefile && + echo f >dir/subdir/tweaked/f && + echo g >dir/subdir/tweaked/g && + echo h >dir/subdir/tweaked/h && + test_seq 20 30 >dir/subdir/tweaked/Makefile && + for i in `test_seq 1 88`; do + echo content $i >dir/unchanged/file_$i + done && + git add . && + git commit -m "O" && + + git branch O && + git branch A && + git branch B && + + git switch A && + git rm dir/subdir/tweaked/f dir/subdir/tweaked/g && + test_seq 2 10 >dir/subdir/e && + test_seq 11 20 >dir/subdir/Makefile && + test_seq 21 30 >dir/subdir/tweaked/Makefile && + mkdir dir/subdir/newsubdir && + git mv dir/subdir/e dir/subdir/newsubdir/ && + git mv dir folder && + git add . && + git commit -m "A" && + + git switch B && + mkdir dir/subdir/newsubdir/ && + echo c code >dir/subdir/newfile.c && + echo python code >dir/subdir/newsubdir/newfile.py && + test_seq 1 11 >dir/subdir/e && + test_seq 10 21 >dir/subdir/Makefile && + test_seq 20 31 >dir/subdir/tweaked/Makefile && + git add . && + git commit -m "B1" && + + echo rust code >dir/subdir/newfile.rs && + test_seq 1 12 >dir/subdir/e && + git add . && + git commit -m "B2" + ) +} + +test_expect_failure '12f: Trivial directory resolve, caching, all kinds of fun' ' + test_setup_12f && + ( + cd 12f && + + git checkout A^0 && + git branch Bmod B && + + git -c merge.directoryRenames=true rebase A Bmod && + + echo Checking the pick of B1... && + + test_must_fail git rev-parse Bmod~1:dir && + + git ls-tree -r Bmod~1 >out && + test_line_count = 98 out && + + git diff --name-status A Bmod~1 >actual && + q_to_tab >expect <<-\EOF && + MQfolder/subdir/Makefile + AQfolder/subdir/newfile.c + MQfolder/subdir/newsubdir/e + AQfolder/subdir/newsubdir/newfile.py + MQfolder/subdir/tweaked/Makefile + EOF + test_cmp expect actual && + + # Three-way merged files + test_seq 2 11 >e_Merge1 && + test_seq 11 21 >Makefile_TOP && + test_seq 21 31 >Makefile_SUB && + git hash-object >expect \ + e_Merge1 \ + Makefile_TOP \ + Makefile_SUB && + git rev-parse >actual \ + Bmod~1:folder/subdir/newsubdir/e \ + Bmod~1:folder/subdir/Makefile \ + Bmod~1:folder/subdir/tweaked/Makefile && + test_cmp expect actual && + + # New files showed up at the right location with right contents + git rev-parse >expect \ + B~1:dir/subdir/newfile.c \ + B~1:dir/subdir/newsubdir/newfile.py && + git rev-parse >actual \ + Bmod~1:folder/subdir/newfile.c \ + Bmod~1:folder/subdir/newsubdir/newfile.py && + test_cmp expect actual && + + # Removed files + test_path_is_missing folder/subdir/tweaked/f && + test_path_is_missing folder/subdir/tweaked/g && + + # Unchanged files or directories + git rev-parse >actual \ + Bmod~1:folder/subdir/a \ + Bmod~1:folder/subdir/b \ + Bmod~1:folder/subdir/c \ + Bmod~1:folder/subdir/d \ + Bmod~1:folder/unchanged \ + Bmod~1:folder/subdir/tweaked/h && + git rev-parse >expect \ + O:dir/subdir/a \ + O:dir/subdir/b \ + O:dir/subdir/c \ + O:dir/subdir/d \ + O:dir/unchanged \ + O:dir/subdir/tweaked/h && + test_cmp expect actual && + + echo Checking the pick of B2... && + + test_must_fail git rev-parse Bmod:dir && + + git ls-tree -r Bmod >out && + test_line_count = 99 out && + + git diff --name-status Bmod~1 Bmod >actual && + q_to_tab >expect <<-\EOF && + AQfolder/subdir/newfile.rs + MQfolder/subdir/newsubdir/e + EOF + test_cmp expect actual && + + # Three-way merged file + test_seq 2 12 >e_Merge2 && + git hash-object e_Merge2 >expect && + git rev-parse Bmod:folder/subdir/newsubdir/e >actual && + test_cmp expect actual + ) +' + ########################################################################### # SECTION 13: Checking informational and conflict messages # -- cgit v1.2.3 From 8536821d05697a6da991fbecc628058329f39364 Mon Sep 17 00:00:00 2001 From: Elijah Newren Date: Thu, 15 Oct 2020 20:46:29 +0000 Subject: t6423: update directory rename detection tests with new rule While investigating the issues highlighted by the testcase in the previous patch, I also found a shortcoming in the directory rename detection rules. Split testcase 6b into two to explain this issue and update directory-rename-detection.txt to remove one of the previous rules that I know believe to be detrimental. Also, update the wording around testcase 8e; while we are not modifying the results of that testcase, we were previously unsure of the appropriate resolution of that test and the new rule makes the previously chosen resolution for that testcase a bit more solid. Signed-off-by: Elijah Newren Signed-off-by: Junio C Hamano --- .../technical/directory-rename-detection.txt | 5 +- t/t6423-merge-rename-directories.sh | 144 ++++++++++++++++++--- 2 files changed, 124 insertions(+), 25 deletions(-) diff --git a/Documentation/technical/directory-rename-detection.txt b/Documentation/technical/directory-rename-detection.txt index ce042cfcae..5d03539412 100644 --- a/Documentation/technical/directory-rename-detection.txt +++ b/Documentation/technical/directory-rename-detection.txt @@ -70,10 +70,7 @@ additional rules: a) If renames split a directory into two or more others, the directory with the most renames, "wins". - b) Avoid directory-rename-detection for a path, if that path is the - source of a rename on either side of a merge. - - c) Only apply implicit directory renames to directories if the other side + b) Only apply implicit directory renames to directories if the other side of history is the one doing the renaming. Limitations -- support in different commands diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh index 31aea47522..00eac6e9a2 100755 --- a/t/t6423-merge-rename-directories.sh +++ b/t/t6423-merge-rename-directories.sh @@ -1277,20 +1277,114 @@ test_expect_success '6a: Tricky rename/delete' ' ) ' -# Testcase 6b, Same rename done on both sides +# Testcase 6b1, Same rename done on both sides +# (Related to testcase 6b2 and 8e) +# Commit O: z/{b,c,d,e} +# Commit A: y/{b,c,d}, x/e +# Commit B: y/{b,c,d}, z/{e,f} +# Expected: y/{b,c,d,f}, x/e +# Note: Directory rename detection says A renamed z/ -> y/ (3 paths renamed +# to y/ and only 1 renamed to x/), therefore the new file 'z/f' in B +# should be moved to 'y/f'. +# +# This is a bit of an edge case where any behavior might surprise users, +# whether that is treating A as renaming z/ -> y/, treating A as renaming +# z/ -> x/, or treating A as not doing any directory rename. However, I +# think this answer is the least confusing and most consistent with the +# rules elsewhere. +# +# A note about z/ -> x/, since it may not be clear how that could come +# about: If we were to ignore files renamed by both sides +# (i.e. z/{b,c,d}), as directory rename detection did in git-2.18 thru +# at least git-2.28, then we would note there are no renames from z/ to +# y/ and one rename from z/ to x/ and thus come to the conclusion that +# A renamed z/ -> x/. This seems more confusing for end users than a +# rename of z/ to y/, it makes directory rename detection behavior +# harder for them to predict. As such, we modified the rule, changed +# the behavior on testcases 6b2 and 8e, and introduced this 6b1 testcase. + +test_setup_6b1 () { + test_create_repo 6b1 && + ( + cd 6b1 && + + mkdir z && + echo b >z/b && + echo c >z/c && + echo d >z/d && + echo e >z/e && + 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 && + mkdir x && + git mv y/e x/e && + test_tick && + git commit -m "A" && + + git checkout B && + git mv z y && + mkdir z && + git mv y/e z/e && + echo f >z/f && + git add z/f && + test_tick && + git commit -m "B" + ) +} + +test_expect_failure '6b1: Same renames done on both sides, plus another rename' ' + test_setup_6b1 && + ( + cd 6b1 && + + git checkout A^0 && + + git -c merge.directoryRenames=true merge -s recursive B^0 && + + git ls-files -s >out && + test_line_count = 5 out && + git ls-files -u >out && + test_line_count = 0 out && + git ls-files -o >out && + test_line_count = 1 out && + + git rev-parse >actual \ + HEAD:y/b HEAD:y/c HEAD:y/d HEAD:x/e HEAD:y/f && + git rev-parse >expect \ + O:z/b O:z/c O:z/d O:z/e B:z/f && + test_cmp expect actual + ) +' + +# Testcase 6b2, Same rename done on both sides # (Related to testcases 6c and 8e) # Commit O: z/{b,c} # Commit A: y/{b,c} # Commit B: y/{b,c}, z/d -# Expected: y/{b,c}, z/d -# Note: If we did directory rename detection here, we'd move z/d into y/, -# but B did that rename and still decided to put the file into z/, -# so we probably shouldn't apply directory rename detection for it. - -test_setup_6b () { - test_create_repo 6b && +# Expected: y/{b,c,d} +# Alternate: y/{b,c}, z/d +# Note: Directory rename detection says A renamed z/ -> y/, therefore the new +# file 'z/d' in B should be moved to 'y/d'. +# +# We could potentially ignore the renames of z/{b,c} on side A since +# those were renamed on both sides. However, it's a bit of a corner +# case because what if there was also a z/e that side A moved to x/e +# and side B left alone? If we used the "ignore renames done on both +# sides" logic, then we'd compute that A renamed z/ -> x/, and move +# z/d to x/d. That seems more surprising and uglier than allowing +# the z/ -> y/ rename. + +test_setup_6b2 () { + test_create_repo 6b2 && ( - cd 6b && + cd 6b2 && mkdir z && echo b >z/b && @@ -1318,10 +1412,10 @@ test_setup_6b () { ) } -test_expect_success '6b: Same rename done on both sides' ' - test_setup_6b && +test_expect_failure '6b2: Same rename done on both sides' ' + test_setup_6b2 && ( - cd 6b && + cd 6b2 && git checkout A^0 && @@ -1335,7 +1429,7 @@ test_expect_success '6b: Same rename done on both sides' ' test_line_count = 1 out && git rev-parse >actual \ - HEAD:y/b HEAD:y/c HEAD:z/d && + HEAD:y/b HEAD:y/c HEAD:y/d && git rev-parse >expect \ O:z/b O:z/c B:z/d && test_cmp expect actual @@ -1343,7 +1437,7 @@ test_expect_success '6b: Same rename done on both sides' ' ' # Testcase 6c, Rename only done on same side -# (Related to testcases 6b and 8e) +# (Related to testcases 6b1, 6b2, and 8e) # Commit O: z/{b,c} # Commit A: z/{b,c} (no change) # Commit B: y/{b,c}, z/d @@ -2269,14 +2363,22 @@ test_expect_success '8d: rename/delete...or not?' ' # Notes: In commit A, directory z got renamed to y. In commit B, directory z # did NOT get renamed; the directory is still present; instead it is # considered to have just renamed a subset of paths in directory z -# elsewhere. However, this is much like testcase 6b (where commit B -# moves all the original paths out of z/ but opted to keep d -# within z/). This makes it hard to judge where d should end up. +# elsewhere. This is much like testcase 6b2 (where commit B moves all +# the original paths out of z/ but opted to keep d within z/). +# +# It was not clear in the past what should be done with this testcase; +# in fact, I noted that I "just picked one" previously. However, +# following the new logic for testcase 6b2, we should take the rename +# and move z/d to y/d. # -# It's possible that users would get confused about this, but what -# should we do instead? It's not at all clear to me whether z/d or -# y/d or something else is a better resolution here, and other cases -# start getting really tricky, so I just picked one. +# 6b1, 6b2, and this case are definitely somewhat fuzzy in terms of +# whether they are optimal for end users, but (a) the default for +# directory rename detection is to mark these all as conflicts +# anyway, (b) it feels like this is less prone to higher order corner +# case confusion, and (c) the current algorithm requires less global +# knowledge (i.e. less coupling in the algorithm between renames done +# on both sides) which thus means users are better able to predict +# the behavior, and predict it without computing as many details. test_setup_8e () { test_create_repo 8e && -- cgit v1.2.3 From c64432aacda9054459ce550eca95929897c301bd Mon Sep 17 00:00:00 2001 From: Elijah Newren Date: Thu, 15 Oct 2020 20:46:30 +0000 Subject: t6423: more involved rules for renaming directories into each other Testcases 12b and 12c were both slightly weird; they were marked as having a weird resolution, but with the note that even straightforward simple rules can give weird results when the input is bizarre. However, during optimization work for merge-ort, I discovered a significant speedup that is possible if we add one more fairly straightforward rule: we don't bother doing directory rename detection if there are no new files added to the directory on the other side of the history to be affected by the directory rename. This seems like an obvious and straightforward rule, but there was one funny corner case where directory rename detection could affect only existing files: the funny corner case where two directories are renamed into each other on opposite sides of history. In other words, it only results in a different output for testcases 12b and 12c. Since we already thought testcases 12b and 12c were weird anyway, and because the optimization often has a significant effect on common cases (but is entirely prevented if we can't change how 12b and 12c function), let's add the additional rule and tweak how 12b and 12c work. Split both testcases into two (one where we add no new files, and one where the side that doesn't rename a given directory will add files to it), and mark them with the new expectation. Signed-off-by: Elijah Newren Signed-off-by: Junio C Hamano --- .../technical/directory-rename-detection.txt | 3 + t/t6423-merge-rename-directories.sh | 253 ++++++++++++++++++--- 2 files changed, 230 insertions(+), 26 deletions(-) diff --git a/Documentation/technical/directory-rename-detection.txt b/Documentation/technical/directory-rename-detection.txt index 5d03539412..49b83ef3cc 100644 --- a/Documentation/technical/directory-rename-detection.txt +++ b/Documentation/technical/directory-rename-detection.txt @@ -73,6 +73,9 @@ additional rules: b) Only apply implicit directory renames to directories if the other side of history is the one doing the renaming. + c) Do not perform directory rename detection for directories which had no + new paths added to them. + Limitations -- support in different commands -------------------------------------------- diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh index 00eac6e9a2..06b46af765 100755 --- a/t/t6423-merge-rename-directories.sh +++ b/t/t6423-merge-rename-directories.sh @@ -4049,31 +4049,124 @@ test_expect_success '12a: Moving one directory hierarchy into another' ' ) ' -# Testcase 12b, Moving two directory hierarchies into each other +# Testcase 12b1, Moving two directory hierarchies into each other # (Related to testcases 1c and 12c) # Commit O: node1/{leaf1, leaf2}, node2/{leaf3, leaf4} # Commit A: node1/{leaf1, leaf2, node2/{leaf3, leaf4}} # Commit B: node2/{leaf3, leaf4, node1/{leaf1, leaf2}} -# Expected: node1/node2/node1/{leaf1, leaf2}, +# Expected: node1/node2/{leaf3, leaf4} +# node2/node1/{leaf1, leaf2} +# NOTE: If there were new files added to the old node1/ or node2/ directories, +# then we would need to detect renames for those directories and would +# find that: +# commit A renames node2/ -> node1/node2/ +# commit B renames node1/ -> node2/node1/ +# Applying those directory renames to the initial result (making all +# four paths experience a transitive renaming), yields +# node1/node2/node1/{leaf1, leaf2} # node2/node1/node2/{leaf3, leaf4} +# as the result. It may be really weird to have two directories +# rename each other, but simple rules give weird results when given +# weird inputs. HOWEVER, the "If" at the beginning of those NOTE was +# false; there were no new files added and thus there is no directory +# rename detection to perform. As such, we just have simple renames +# and the expected answer is: +# node1/node2/{leaf3, leaf4} +# node2/node1/{leaf1, leaf2} + +test_setup_12b1 () { + test_create_repo 12b1 && + ( + cd 12b1 && + + mkdir -p node1 node2 && + echo leaf1 >node1/leaf1 && + echo leaf2 >node1/leaf2 && + echo leaf3 >node2/leaf3 && + echo leaf4 >node2/leaf4 && + git add node1 node2 && + test_tick && + git commit -m "O" && + + git branch O && + git branch A && + git branch B && + + git checkout A && + git mv node2/ node1/ && + test_tick && + git commit -m "A" && + + git checkout B && + git mv node1/ node2/ && + test_tick && + git commit -m "B" + ) +} + +test_expect_failure '12b1: Moving two directory hierarchies into each other' ' + test_setup_12b1 && + ( + cd 12b1 && + + git checkout A^0 && + + git -c merge.directoryRenames=true merge -s recursive B^0 && + + git ls-files -s >out && + test_line_count = 4 out && + + git rev-parse >actual \ + HEAD:node2/node1/leaf1 \ + HEAD:node2/node1/leaf2 \ + HEAD:node1/node2/leaf3 \ + HEAD:node1/node2/leaf4 && + git rev-parse >expect \ + O:node1/leaf1 \ + O:node1/leaf2 \ + O:node2/leaf3 \ + O:node2/leaf4 && + test_cmp expect actual + ) +' + +# Testcase 12b2, Moving two directory hierarchies into each other +# (Related to testcases 1c and 12c) +# Commit O: node1/{leaf1, leaf2}, node2/{leaf3, leaf4} +# Commit A: node1/{leaf1, leaf2, leaf5, node2/{leaf3, leaf4}} +# Commit B: node2/{leaf3, leaf4, leaf6, node1/{leaf1, leaf2}} +# Expected: node1/node2/{node1/{leaf1, leaf2}, leaf6} +# node2/node1/{node2/{leaf3, leaf4}, leaf5} # NOTE: Without directory renames, we would expect -# node2/node1/{leaf1, leaf2}, -# node1/node2/{leaf3, leaf4} +# A: node2/leaf3 -> node1/node2/leaf3 +# A: node2/leaf1 -> node1/node2/leaf4 +# A: Adds node1/leaf5 +# B: node1/leaf1 -> node2/node1/leaf1 +# B: node1/leaf2 -> node2/node1/leaf2 +# B: Adds node2/leaf6 # with directory rename detection, we note that # commit A renames node2/ -> node1/node2/ # commit B renames node1/ -> node2/node1/ -# therefore, applying those directory renames to the initial result -# (making all four paths experience a transitive renaming), yields -# the expected result. +# therefore, applying A's directory rename to the paths added in B gives: +# B: node1/leaf1 -> node1/node2/node1/leaf1 +# B: node1/leaf2 -> node1/node2/node1/leaf2 +# B: Adds node1/node2/leaf6 +# and applying B's directory rename to the paths added in A gives: +# A: node2/leaf3 -> node2/node1/node2/leaf3 +# A: node2/leaf1 -> node2/node1/node2/leaf4 +# A: Adds node2/node1/leaf5 +# resulting in the expected +# node1/node2/{node1/{leaf1, leaf2}, leaf6} +# node2/node1/{node2/{leaf3, leaf4}, leaf5} # # You may ask, is it weird to have two directories rename each other? # To which, I can do no more than shrug my shoulders and say that # even simple rules give weird results when given weird inputs. -test_setup_12b () { - test_create_repo 12b && +test_setup_12b2 () { + test_create_repo 12b2 && ( - cd 12b && + cd 12b2 && mkdir -p node1 node2 && echo leaf1 >node1/leaf1 && @@ -4090,43 +4183,51 @@ test_setup_12b () { git checkout A && git mv node2/ node1/ && + echo leaf5 >node1/leaf5 && + git add node1/leaf5 && test_tick && git commit -m "A" && git checkout B && git mv node1/ node2/ && + echo leaf6 >node2/leaf6 && + git add node2/leaf6 && test_tick && git commit -m "B" ) } -test_expect_success '12b: Moving two directory hierarchies into each other' ' - test_setup_12b && +test_expect_success '12b2: Moving two directory hierarchies into each other' ' + test_setup_12b2 && ( - cd 12b && + cd 12b2 && git checkout A^0 && git -c merge.directoryRenames=true merge -s recursive B^0 && git ls-files -s >out && - test_line_count = 4 out && + test_line_count = 6 out && git rev-parse >actual \ HEAD:node1/node2/node1/leaf1 \ HEAD:node1/node2/node1/leaf2 \ HEAD:node2/node1/node2/leaf3 \ - HEAD:node2/node1/node2/leaf4 && + HEAD:node2/node1/node2/leaf4 \ + HEAD:node2/node1/leaf5 \ + HEAD:node1/node2/leaf6 && git rev-parse >expect \ O:node1/leaf1 \ O:node1/leaf2 \ O:node2/leaf3 \ - O:node2/leaf4 && + O:node2/leaf4 \ + A:node1/leaf5 \ + B:node2/leaf6 && test_cmp expect actual ) ' -# Testcase 12c, Moving two directory hierarchies into each other w/ content merge +# Testcase 12c1, Moving two directory hierarchies into each other w/ content merge # (Related to testcase 12b) # Commit O: node1/{ leaf1_1, leaf2_1}, node2/{leaf3_1, leaf4_1} # Commit A: node1/{ leaf1_2, leaf2_2, node2/{leaf3_2, leaf4_2}} @@ -4134,13 +4235,13 @@ test_expect_success '12b: Moving two directory hierarchies into each other' ' # Expected: Content merge conflicts for each of: # node1/node2/node1/{leaf1, leaf2}, # node2/node1/node2/{leaf3, leaf4} -# NOTE: This is *exactly* like 12c, except that every path is modified on +# NOTE: This is *exactly* like 12b1, except that every path is modified on # each side of the merge. -test_setup_12c () { - test_create_repo 12c && +test_setup_12c1 () { + test_create_repo 12c1 && ( - cd 12c && + cd 12c1 && mkdir -p node1 node2 && printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf1\n" >node1/leaf1 && @@ -4171,10 +4272,10 @@ test_setup_12c () { ) } -test_expect_success '12c: Moving one directory hierarchy into another w/ content merge' ' - test_setup_12c && +test_expect_failure '12c1: Moving one directory hierarchy into another w/ content merge' ' + test_setup_12c1 && ( - cd 12c && + cd 12c1 && git checkout A^0 && @@ -4183,6 +4284,102 @@ test_expect_success '12c: Moving one directory hierarchy into another w/ content git ls-files -u >out && test_line_count = 12 out && + git rev-parse >actual \ + :1:node2/node1/leaf1 \ + :1:node2/node1/leaf2 \ + :1:node1/node2/leaf3 \ + :1:node1/node2/leaf4 \ + :2:node2/node1/leaf1 \ + :2:node2/node1/leaf2 \ + :2:node1/node2/leaf3 \ + :2:node1/node2/leaf4 \ + :3:node2/node1/leaf1 \ + :3:node2/node1/leaf2 \ + :3:node1/node2/leaf3 \ + :3:node1/node2/leaf4 && + git rev-parse >expect \ + O:node1/leaf1 \ + O:node1/leaf2 \ + O:node2/leaf3 \ + O:node2/leaf4 \ + A:node1/leaf1 \ + A:node1/leaf2 \ + A:node1/node2/leaf3 \ + A:node1/node2/leaf4 \ + B:node2/node1/leaf1 \ + B:node2/node1/leaf2 \ + B:node2/leaf3 \ + B:node2/leaf4 && + test_cmp expect actual + ) +' + +# Testcase 12c2, Moving two directory hierarchies into each other w/ content merge +# (Related to testcase 12b) +# Commit O: node1/{ leaf1_1, leaf2_1}, node2/{leaf3_1, leaf4_1} +# Commit A: node1/{ leaf1_2, leaf2_2, node2/{leaf3_2, leaf4_2}, leaf5} +# Commit B: node2/{node1/{leaf1_3, leaf2_3}, leaf3_3, leaf4_3, leaf6} +# Expected: Content merge conflicts for each of: +# node1/node2/node1/{leaf1, leaf2} +# node2/node1/node2/{leaf3, leaf4} +# plus +# node2/node1/leaf5 +# node1/node2/leaf6 +# NOTE: This is *exactly* like 12b2, except that every path from O is modified +# on each side of the merge. + +test_setup_12c2 () { + test_create_repo 12c2 && + ( + cd 12c2 && + + mkdir -p node1 node2 && + printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf1\n" >node1/leaf1 && + printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf2\n" >node1/leaf2 && + printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf3\n" >node2/leaf3 && + printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf4\n" >node2/leaf4 && + git add node1 node2 && + test_tick && + git commit -m "O" && + + git branch O && + git branch A && + git branch B && + + git checkout A && + git mv node2/ node1/ && + for i in `git ls-files`; do echo side A >>$i; done && + git add -u && + echo leaf5 >node1/leaf5 && + git add node1/leaf5 && + test_tick && + git commit -m "A" && + + git checkout B && + git mv node1/ node2/ && + for i in `git ls-files`; do echo side B >>$i; done && + git add -u && + echo leaf6 >node2/leaf6 && + git add node2/leaf6 && + test_tick && + git commit -m "B" + ) +} + +test_expect_success '12c2: Moving one directory hierarchy into another w/ content merge' ' + test_setup_12c2 && + ( + cd 12c2 && + + git checkout A^0 && + + test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 && + + git ls-files -s >out && + test_line_count = 14 out && + git ls-files -u >out && + test_line_count = 12 out && + git rev-parse >actual \ :1:node1/node2/node1/leaf1 \ :1:node1/node2/node1/leaf2 \ @@ -4195,7 +4392,9 @@ test_expect_success '12c: Moving one directory hierarchy into another w/ content :3:node1/node2/node1/leaf1 \ :3:node1/node2/node1/leaf2 \ :3:node2/node1/node2/leaf3 \ - :3:node2/node1/node2/leaf4 && + :3:node2/node1/node2/leaf4 \ + :0:node2/node1/leaf5 \ + :0:node1/node2/leaf6 && git rev-parse >expect \ O:node1/leaf1 \ O:node1/leaf2 \ @@ -4208,7 +4407,9 @@ test_expect_success '12c: Moving one directory hierarchy into another w/ content B:node2/node1/leaf1 \ B:node2/node1/leaf2 \ B:node2/leaf3 \ - B:node2/leaf4 && + B:node2/leaf4 \ + A:node1/leaf5 \ + B:node2/leaf6 && test_cmp expect actual ) ' -- cgit v1.2.3