Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
t/t6043-merge-rename-directories.sh | 505 ++++++++++++++++++++++++++++++++++++
1 file changed, 505 insertions(+)
diff --git a/t/t6043-merge-rename-directories.sh b/t/t6043-merge-rename-directories.sh
index bdfd943c88..bb179b16c8 100755
--- a/t/t6043-merge-rename-directories.sh
+++ b/t/t6043-merge-rename-directories.sh
@@ -265,6 +265,7 @@ test_expect_failure '1d-check: Directory renames cause a rename/rename(2to1) con
'
# Testcase 1e, Renamed directory, with all filenames being renamed too
+# (Related to testcases 9f & 9g)
# Commit A: z/{oldb,oldc}
# Commit B: y/{newb,newc}
# Commit C: z/{oldb,oldc,d}
@@ -2054,4 +2055,508 @@ test_expect_failure '8e-check: Both sides rename, one side adds to original dire
test_i18ngrep CONFLICT.*rename/rename.*z/b.*y/b.*w/b out
'
+###########################################################################
+# SECTION 9: Other testcases
+#
+# I came up with the testcases in the first eight sections before coding up
+# the implementation. The testcases in this section were mostly ones I
+# thought of while coding/debugging, and which I was too lazy to insert
+# into the previous sections because I didn't want to re-label with all the
+# testcase references. :-)
+###########################################################################
+
+# Testcase 9a, Inner renamed directory within outer renamed directory
+# (Related to testcase 1f)
+# Commit A: z/{b,c,d/{e,f,g}}
+# Commit B: y/{b,c}, x/w/{e,f,g}
+# Commit C: z/{b,c,d/{e,f,g,h},i}
+# Expected: y/{b,c,i}, x/w/{e,f,g,h}
+# NOTE: The only reason this one is interesting is because when a directory
+# is split into multiple other directories, we determine by the weight
+# of which one had the most paths going to it. A naive implementation
+# of that could take the new file in commit C at z/i to x/w/i or x/i.
+
+test_expect_success '9a-setup: Inner renamed directory within outer renamed directory' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ mkdir -p z/d &&
+ echo b >z/b &&
+ echo c >z/c &&
+ echo e >z/d/e &&
+ echo f >z/d/f &&
+ echo g >z/d/g &&
+ git add z &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git branch A &&
+ git branch B &&
+ git branch C &&
+
+ git checkout B &&
+ mkdir x &&
+ git mv z/d x/w &&
+ git mv z y &&
+ test_tick &&
+ git commit -m "B" &&
+
+ git checkout C &&
+ echo h >z/d/h &&
+ echo i >z/i &&
+ git add z &&
+ test_tick &&
+ git commit -m "C"
+'
+
+test_expect_failure '9a-check: Inner renamed directory within outer renamed directory' '
+ git checkout B^0 &&
+
+ git merge -s recursive C^0 &&
+
+ test 7 -eq $(git ls-files -s | wc -l) &&
+ test 0 -eq $(git ls-files -u | wc -l) &&
+ test 0 -eq $(git ls-files -o | wc -l) &&
+
+ test $(git rev-parse HEAD:y/b) = $(git rev-parse A:z/b) &&
+ test $(git rev-parse HEAD:y/c) = $(git rev-parse A:z/c) &&
+ test $(git rev-parse HEAD:y/i) = $(git rev-parse C:z/i) &&
+
+ test $(git rev-parse HEAD:x/w/e) = $(git rev-parse A:z/d/e) &&
+ test $(git rev-parse HEAD:x/w/f) = $(git rev-parse A:z/d/f) &&
+ test $(git rev-parse HEAD:x/w/g) = $(git rev-parse A:z/d/g) &&
+ test $(git rev-parse HEAD:x/w/h) = $(git rev-parse C:z/d/h)
+'
+
+# Testcase 9b, Transitive rename with content merge
+# (Related to testcase 1c)
+# Commit A: z/{b,c}, x/d_1
+# Commit B: y/{b,c}, x/d_2
+# Commit C: z/{b,c,d_3}
+# Expected: y/{b,c,d_merged}
+
+test_expect_success '9b-setup: Transitive rename with content merge' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ mkdir z &&
+ echo b >z/b &&
+ echo c >z/c &&
+ mkdir x &&
+ test_seq 1 10 >x/d &&
+ git add z x &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git branch A &&
+ git branch B &&
+ git branch C &&
+
+ git checkout B &&
+ git mv z y &&
+ test_seq 1 11 >x/d &&
+ git add x/d &&
+ test_tick &&
+ git commit -m "B" &&
+
+ git checkout C &&
+ test_seq 0 10 >x/d &&
+ git mv x/d z/d &&
+ git add z/d &&
+ test_tick &&
+ git commit -m "C"
+'
+
+test_expect_failure '9b-check: Transitive rename with content merge' '
+ git checkout B^0 &&
+
+ git merge -s recursive C^0 &&
+
+ test 3 -eq $(git ls-files -s | wc -l) &&
+
+ test $(git rev-parse HEAD:y/b) = $(git rev-parse A:z/b) &&
+ test $(git rev-parse HEAD:y/c) = $(git rev-parse A:z/c) &&
+ test_must_fail git rev-parse HEAD:x/d &&
+ test_must_fail git rev-parse HEAD:z/d &&
+ test ! -f z/d &&
+
+ test $(git rev-parse HEAD:y/d) != $(git rev-parse A:x/d) &&
+ test $(git rev-parse HEAD:y/d) != $(git rev-parse B:x/d) &&
+ test $(git rev-parse HEAD:y/d) != $(git rev-parse C:z/d) &&
+ test_seq 0 11 >expected &&
+ git add expected &&
+ test $(git rev-parse HEAD:y/d) = $(git rev-parse :0:expected) &&
+ test_cmp expected y/d
+'
+
+# Testcase 9c, Doubly transitive rename?
+# (Related to testcase 1c, 7e, and 9d)
+# Commit A: z/{b,c}, x/{d,e}, w/f
+# Commit B: y/{b,c}, x/{d,e,f,g}
+# Commit C: z/{b,c,d,e}, w/f
+# Expected: y/{b,c,d,e}, x/{f,g}
+#
+# NOTE: x/f and x/g may be slightly confusing here. The rename from w/f to
+# x/f is clear. Let's look beyond that. Here's the logic:
+# Commit C renamed x/ -> z/
+# Commit B renamed z/ -> y/
+# So, we could possibly further rename x/f to z/f to y/f, a doubly
+# transient rename. However, where does it end? We can chain these
+# indefinitely (see testcase 9d). What if there is a D/F conflict
+# at z/f/ or y/f/? Or just another file conflict at one of those
+# paths? In the case of an N-long chain of transient renamings,
+# where do we "abort" the rename at? Can the user make sense of
+# the resulting conflict and resolve it?
+#
+# To avoid this confusion I use the simple rule that if the other side
+# of history did a directory rename to a path that your side renamed
+# away, then ignore that particular rename from the other side of
+# history for any implicit directory renames.
+
+test_expect_success '9c-setup: Doubly transitive rename?' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ mkdir z &&
+ echo b >z/b &&
+ echo c >z/c &&
+ mkdir x &&
+ echo d >x/d &&
+ echo e >x/e &&
+ mkdir w &&
+ echo f >w/f &&
+ git add z x w &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git branch A &&
+ git branch B &&
+ git branch C &&
+
+ git checkout B &&
+ git mv z y &&
+ git mv w/f x/ &&
+ echo g >x/g &&
+ git add x/g &&
+ test_tick &&
+ git commit -m "B" &&
+
+ git checkout C &&
+ git mv x/d z/d &&
+ git mv x/e z/e &&
+ test_tick &&
+ git commit -m "C"
+'
+
+test_expect_failure '9c-check: Doubly transitive rename?' '
+ git checkout B^0 &&
+
+ git merge -s recursive C^0 >out &&
+ test_i18ngrep "WARNING: Avoiding applying x -> z rename to x/f" out &&
+
+ test 6 -eq $(git ls-files -s | wc -l) &&
+ test 1 -eq $(git ls-files -o | wc -l) &&
+
+ test $(git rev-parse HEAD:y/b) = $(git rev-parse A:z/b) &&
+ test $(git rev-parse HEAD:y/c) = $(git rev-parse A:z/c) &&
+ test $(git rev-parse HEAD:y/d) = $(git rev-parse A:x/d) &&
+ test $(git rev-parse HEAD:y/e) = $(git rev-parse A:x/e) &&
+ test $(git rev-parse HEAD:x/f) = $(git rev-parse A:w/f) &&
+ test $(git rev-parse HEAD:x/g) = $(git rev-parse B:x/g)
+'
+
+# Testcase 9d, N-fold transitive rename?
+# (Related to testcase 9c...and 1c and 7e)
+# Commit A: z/a, y/b, x/c, w/d, v/e, u/f
+# Commit B: y/{a,b}, w/{c,d}, u/{e,f}
+# Commit C: z/{a,t}, x/{b,c}, v/{d,e}, u/f
+# Expected: <see NOTE first>
+#
+# NOTE: z/ -> y/ (in commit B)
+# y/ -> x/ (in commit C)
+# x/ -> w/ (in commit B)
+# w/ -> v/ (in commit C)
+# v/ -> u/ (in commit B)
+# So, if we add a file to z, say z/t, where should it end up? In u?
+# What if there's another file or directory named 't' in one of the
+# intervening directories and/or in u itself? Also, shouldn't the
+# same logic that places 't' in u/ also move ALL other files to u/?
+# What if there are file or directory conflicts in any of them? If
+# we attempted to do N-way (N-fold? N-ary? N-uple?) transitive renames
+# like this, would the user have any hope of understanding any
+# conflicts or how their working tree ended up? I think not, so I'm
+# ruling out N-ary transitive renames for N>1.
+#
+# Therefore our expected result is:
+# z/t, y/a, x/b, w/c, u/d, u/e, u/f
+# The reason that v/d DOES get transitively renamed to u/d is that u/ isn't
+# renamed somewhere. A slightly sub-optimal result, but it uses fairly
+# simple rules that are consistent with what we need for all the other
+# testcases and simplifies things for the user.
+
+test_expect_success '9d-setup: N-way transitive rename?' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ mkdir z y x w v u &&
+ echo a >z/a &&
+ echo b >y/b &&
+ echo c >x/c &&
+ echo d >w/d &&
+ echo e >v/e &&
+ echo f >u/f &&
+ git add z y x w v u &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git branch A &&
+ git branch B &&
+ git branch C &&
+
+ git checkout B &&
+ git mv z/a y/ &&
+ git mv x/c w/ &&
+ git mv v/e u/ &&
+ test_tick &&
+ git commit -m "B" &&
+
+ git checkout C &&
+ echo t >z/t &&
+ git mv y/b x/ &&
+ git mv w/d v/ &&
+ git add z/t &&
+ test_tick &&
+ git commit -m "C"
+'
+
+test_expect_failure '9d-check: N-way transitive rename?' '
+ git checkout B^0 &&
+
+ git merge -s recursive C^0 >out &&
+ test_i18ngrep "WARNING: Avoiding applying z -> y rename to z/t" out &&
+ test_i18ngrep "WARNING: Avoiding applying y -> x rename to y/a" out &&
+ test_i18ngrep "WARNING: Avoiding applying x -> w rename to x/b" out &&
+ test_i18ngrep "WARNING: Avoiding applying w -> v rename to w/c" out &&
+
+ test 7 -eq $(git ls-files -s | wc -l) &&
+ test 1 -eq $(git ls-files -o | wc -l) &&
+
+ test $(git rev-parse HEAD:z/t) = $(git rev-parse C:z/t) &&
+ test $(git rev-parse HEAD:y/a) = $(git rev-parse A:z/a) &&
+ test $(git rev-parse HEAD:x/b) = $(git rev-parse A:y/b) &&
+ test $(git rev-parse HEAD:w/c) = $(git rev-parse A:x/c) &&
+ test $(git rev-parse HEAD:u/d) = $(git rev-parse A:w/d) &&
+ test $(git rev-parse HEAD:u/e) = $(git rev-parse A:v/e) &&
+ test $(git rev-parse HEAD:u/f) = $(git rev-parse B:u/f)
+'
+
+# Testcase 9e, N-to-1 whammo
+# (Related to testcase 9c...and 1c and 7e)
+# Commit A: dir1/{a,b}, dir2/{d,e}, dir3/{g,h}, dirN/{j,k}
+# Commit B: dir1/{a,b,c,yo}, dir2/{d,e,f,yo}, dir3/{g,h,i,yo}, dirN/{j,k,l,yo}
+# Commit C: combined/{a,b,d,e,g,h,j,k}
+# Expected: combined/{a,b,c,d,e,f,g,h,i,j,k,l}, CONFLICT(Nto1) warnings,
+# dir1/yo, dir2/yo, dir3/yo, dirN/yo
+
+test_expect_success '9e-setup: N-to-1 whammo' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ mkdir dir1 dir2 dir3 dirN &&
+ echo a >dir1/a &&
+ echo b >dir1/b &&
+ echo d >dir2/d &&
+ echo e >dir2/e &&
+ echo g >dir3/g &&
+ echo h >dir3/h &&
+ echo j >dirN/j &&
+ echo k >dirN/k &&
+ git add dir* &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git branch A &&
+ git branch B &&
+ git branch C &&
+
+ git checkout B &&
+ echo c >dir1/c &&
+ echo yo >dir1/yo &&
+ echo f >dir2/f &&
+ echo yo >dir2/yo &&
+ echo i >dir3/i &&
+ echo yo >dir3/yo &&
+ echo l >dirN/l &&
+ echo yo >dirN/yo &&
+ git add dir* &&
+ test_tick &&
+ git commit -m "B" &&
+
+ git checkout C &&
+ git mv dir1 combined &&
+ git mv dir2/* combined/ &&
+ git mv dir3/* combined/ &&
+ git mv dirN/* combined/ &&
+ test_tick &&
+ git commit -m "C"
+'
+
+test_expect_failure '9e-check: N-to-1 whammo' '
+ git checkout B^0 &&
+
+ test_must_fail git merge -s recursive C^0 >out &&
+ test_i18ngrep "CONFLICT (implicit dir rename): Cannot map more than one path to combined/yo" out >error_line &&
+ grep -q dir1/yo error_line &&
+ grep -q dir2/yo error_line &&
+ grep -q dir3/yo error_line &&
+ grep -q dirN/yo error_line &&
+
+ test 16 -eq $(git ls-files -s | wc -l) &&
+ test 0 -eq $(git ls-files -u | wc -l) &&
+ test 2 -eq $(git ls-files -o | wc -l) &&
+
+ test $(git rev-parse :0:combined/a) = $(git rev-parse A:dir1/a) &&
+ test $(git rev-parse :0:combined/b) = $(git rev-parse A:dir1/b) &&
+ test $(git rev-parse :0:combined/c) = $(git rev-parse B:dir1/c) &&
+ test $(git rev-parse :0:combined/d) = $(git rev-parse A:dir2/d) &&
+ test $(git rev-parse :0:combined/e) = $(git rev-parse A:dir2/e) &&
+ test $(git rev-parse :0:combined/f) = $(git rev-parse B:dir2/f) &&
+ test $(git rev-parse :0:combined/g) = $(git rev-parse A:dir3/g) &&
+ test $(git rev-parse :0:combined/h) = $(git rev-parse A:dir3/h) &&
+ test $(git rev-parse :0:combined/i) = $(git rev-parse B:dir3/i) &&
+ test $(git rev-parse :0:combined/j) = $(git rev-parse A:dirN/j) &&
+ test $(git rev-parse :0:combined/k) = $(git rev-parse A:dirN/k) &&
+ test $(git rev-parse :0:combined/l) = $(git rev-parse B:dirN/l) &&
+
+ test $(git rev-parse :0:dir1/yo) = $(git rev-parse B:dir1/yo) &&
+ test $(git rev-parse :0:dir2/yo) = $(git rev-parse B:dir2/yo) &&
+ test $(git rev-parse :0:dir3/yo) = $(git rev-parse B:dir3/yo) &&
+ test $(git rev-parse :0:dirN/yo) = $(git rev-parse B:dirN/yo)
+'
+
+# Testcase 9f, Renamed directory that only contained immediate subdirs
+# (Related to testcases 1e & 9g)
+# Commit A: goal/{a,b}/$more_files
+# Commit B: priority/{a,b}/$more_files
+# Commit C: goal/{a,b}/$more_files, goal/c
+# Expected: priority/{a,b}/$more_files, priority/c
+
+test_expect_success '9f-setup: Renamed directory that only contained immediate subdirs' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ mkdir -p goal/a &&
+ mkdir -p goal/b &&
+ echo foo >goal/a/foo &&
+ echo bar >goal/b/bar &&
+ echo baz >goal/b/baz &&
+ git add goal &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git branch A &&
+ git branch B &&
+ git branch C &&
+
+ git checkout B &&
+ git mv goal/ priority &&
+ test_tick &&
+ git commit -m "B" &&
+
+ git checkout C &&
+ echo c >goal/c &&
+ git add goal/c &&
+ test_tick &&
+ git commit -m "C"
+'
+
+test_expect_failure '9f-check: Renamed directory that only contained immediate subdirs' '
+ git checkout B^0 &&
+
+ git merge -s recursive C^0 &&
+
+ test 4 -eq $(git ls-files -s | wc -l) &&
+
+ test $(git rev-parse HEAD:priority/a/foo) = $(git rev-parse A:goal/a/foo) &&
+ test $(git rev-parse HEAD:priority/b/bar) = $(git rev-parse A:goal/b/bar) &&
+ test $(git rev-parse HEAD:priority/b/baz) = $(git rev-parse A:goal/b/baz) &&
+ test $(git rev-parse HEAD:priority/c) = $(git rev-parse C:goal/c) &&
+ test_must_fail git rev-parse HEAD:goal/c
+'
+
+# Testcase 9g, Renamed directory that only contained immediate subdirs, immediate subdirs renamed
+# (Related to testcases 1e & 9f)
+# Commit A: goal/{a,b}/$more_files
+# Commit B: priority/{alpha,bravo}/$more_files
+# Commit C: goal/{a,b}/$more_files, goal/c
+# Expected: priority/{alpha,bravo}/$more_files, priority/c
+
+test_expect_success '9g-setup: Renamed directory that only contained immediate subdirs, immediate subdirs renamed' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ mkdir -p goal/a &&
+ mkdir -p goal/b &&
+ echo foo >goal/a/foo &&
+ echo bar >goal/b/bar &&
+ echo baz >goal/b/baz &&
+ git add goal &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git branch A &&
+ git branch B &&
+ git branch C &&
+
+ git checkout B &&
+ mkdir priority &&
+ git mv goal/a/ priority/alpha &&
+ git mv goal/b/ priority/beta &&
+ rmdir goal/ &&
+ test_tick &&
+ git commit -m "B" &&
+
+ git checkout C &&
+ echo c >goal/c &&
+ git add goal/c &&
+ test_tick &&
+ git commit -m "C"
+'
+
+test_expect_failure '9g-check: Renamed directory that only contained immediate subdirs, immediate subdirs renamed' '
+ git checkout B^0 &&
+
+ git merge -s recursive C^0 &&
+
+ test 4 -eq $(git ls-files -s | wc -l) &&
+
+ test $(git rev-parse HEAD:priority/alpha/foo) = $(git rev-parse A:goal/a/foo) &&
+ test $(git rev-parse HEAD:priority/beta/bar) = $(git rev-parse A:goal/b/bar) &&
+ test $(git rev-parse HEAD:priority/beta/baz) = $(git rev-parse A:goal/b/baz) &&
+ test $(git rev-parse HEAD:priority/c) = $(git rev-parse C:goal/c) &&
+ test_must_fail git rev-parse HEAD:goal/c
+'
+
+###########################################################################
+# Rules suggested by section 9:
+#
+# If the other side of history did a directory rename to a path that your
+# side renamed away, then ignore that particular rename from the other
+# side of history for any implicit directory renames.
+###########################################################################
+
test_done
--
2.15.0.5.g9567be9905
