)
'
+#
+# criss-cross with modify/modify on a symlink:
+#
+# B D
+# o---o
+# / \ / \
+# A o X ? F
+# \ / \ /
+# o---o
+# C E
+#
+# Commit A: simple simlink fickle->lagoon
+# Commit B: redirect fickle->disneyland
+# Commit C: redirect fickle->home
+# Commit D: merge B&C, resolving in favor of B
+# Commit E: merge B&C, resolving in favor of C
+#
+# This is an obvious modify/modify conflict for the symlink 'fickle'. Can
+# git detect it?
+
+test_expect_success 'setup symlink modify/modify' '
+ test_create_repo symlink-modify-modify &&
+ (
+ cd symlink-modify-modify &&
+
+ test_ln_s_add lagoon fickle &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ git rm fickle &&
+ test_ln_s_add disneyland fickle &&
+ git commit -m B &&
+
+ git checkout -b C A &&
+ git rm fickle &&
+ test_ln_s_add home fickle &&
+ git add fickle &&
+ git commit -m C &&
+
+ git checkout -q B^0 &&
+ git merge -s ours -m D C^0 &&
+ git tag D &&
+
+ git checkout -q C^0 &&
+ git merge -s ours -m E B^0 &&
+ git tag E
+ )
+'
+
+test_expect_failure 'check symlink modify/modify' '
+ (
+ cd symlink-modify-modify &&
+
+ git checkout D^0 &&
+
+ test_must_fail git merge -s recursive E^0 &&
+
+ git ls-files -s >out &&
+ test_line_count = 3 out &&
+ git ls-files -u >out &&
+ test_line_count = 3 out &&
+ git ls-files -o >out &&
+ test_line_count = 1 out
+ )
+'
+
+#
+# criss-cross with add/add of a symlink:
+#
+# B D
+# o---o
+# / \ / \
+# A o X ? F
+# \ / \ /
+# o---o
+# C E
+#
+# Commit A: No symlink or path exists yet
+# Commit B: set up symlink: fickle->disneyland
+# Commit C: set up symlink: fickle->home
+# Commit D: merge B&C, resolving in favor of B
+# Commit E: merge B&C, resolving in favor of C
+#
+# This is an obvious add/add conflict for the symlink 'fickle'. Can
+# git detect it?
+
+test_expect_success 'setup symlink add/add' '
+ test_create_repo symlink-add-add &&
+ (
+ cd symlink-add-add &&
+
+ touch ignoreme &&
+ git add ignoreme &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ test_ln_s_add disneyland fickle &&
+ git commit -m B &&
+
+ git checkout -b C A &&
+ test_ln_s_add home fickle &&
+ git add fickle &&
+ git commit -m C &&
+
+ git checkout -q B^0 &&
+ git merge -s ours -m D C^0 &&
+ git tag D &&
+
+ git checkout -q C^0 &&
+ git merge -s ours -m E B^0 &&
+ git tag E
+ )
+'
+
+test_expect_failure 'check symlink add/add' '
+ (
+ cd symlink-add-add &&
+
+ git checkout D^0 &&
+
+ test_must_fail git merge -s recursive E^0 &&
+
+ git ls-files -s >out &&
+ test_line_count = 2 out &&
+ git ls-files -u >out &&
+ test_line_count = 2 out &&
+ git ls-files -o >out &&
+ test_line_count = 1 out
+ )
+'
+
+#
+# criss-cross with modify/modify on a submodule:
+#
+# B D
+# o---o
+# / \ / \
+# A o X ? F
+# \ / \ /
+# o---o
+# C E
+#
+# Commit A: simple submodule repo
+# Commit B: update repo
+# Commit C: update repo differently
+# Commit D: merge B&C, resolving in favor of B
+# Commit E: merge B&C, resolving in favor of C
+#
+# This is an obvious modify/modify conflict for the submodule 'repo'. Can
+# git detect it?
+
+test_expect_success 'setup submodule modify/modify' '
+ test_create_repo submodule-modify-modify &&
+ (
+ cd submodule-modify-modify &&
+
+ test_create_repo submod &&
+ (
+ cd submod &&
+ touch file-A &&
+ git add file-A &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ touch file-B &&
+ git add file-B &&
+ git commit -m B &&
+ git tag B &&
+
+ git checkout -b C A &&
+ touch file-C &&
+ git add file-C &&
+ git commit -m C &&
+ git tag C
+ ) &&
+
+ git -C submod reset --hard A &&
+ git add submod &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ git -C submod reset --hard B &&
+ git add submod &&
+ git commit -m B &&
+
+ git checkout -b C A &&
+ git -C submod reset --hard C &&
+ git add submod &&
+ git commit -m C &&
+
+ git checkout -q B^0 &&
+ git merge -s ours -m D C^0 &&
+ git tag D &&
+
+ git checkout -q C^0 &&
+ git merge -s ours -m E B^0 &&
+ git tag E
+ )
+'
+
+test_expect_failure 'check submodule modify/modify' '
+ (
+ cd submodule-modify-modify &&
+
+ git checkout D^0 &&
+
+ test_must_fail git merge -s recursive E^0 &&
+
+ git ls-files -s >out &&
+ test_line_count = 3 out &&
+ git ls-files -u >out &&
+ test_line_count = 3 out &&
+ git ls-files -o >out &&
+ test_line_count = 1 out
+ )
+'
+
+#
+# criss-cross with add/add on a submodule:
+#
+# B D
+# o---o
+# / \ / \
+# A o X ? F
+# \ / \ /
+# o---o
+# C E
+#
+# Commit A: nothing of note
+# Commit B: introduce submodule repo
+# Commit C: introduce submodule repo at different commit
+# Commit D: merge B&C, resolving in favor of B
+# Commit E: merge B&C, resolving in favor of C
+#
+# This is an obvious add/add conflict for the submodule 'repo'. Can
+# git detect it?
+
+test_expect_success 'setup submodule add/add' '
+ test_create_repo submodule-add-add &&
+ (
+ cd submodule-add-add &&
+
+ test_create_repo submod &&
+ (
+ cd submod &&
+ touch file-A &&
+ git add file-A &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ touch file-B &&
+ git add file-B &&
+ git commit -m B &&
+ git tag B &&
+
+ git checkout -b C A &&
+ touch file-C &&
+ git add file-C &&
+ git commit -m C &&
+ git tag C
+ ) &&
+
+ touch irrelevant-file &&
+ git add irrelevant-file &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ git -C submod reset --hard B &&
+ git add submod &&
+ git commit -m B &&
+
+ git checkout -b C A &&
+ git -C submod reset --hard C &&
+ git add submod &&
+ git commit -m C &&
+
+ git checkout -q B^0 &&
+ git merge -s ours -m D C^0 &&
+ git tag D &&
+
+ git checkout -q C^0 &&
+ git merge -s ours -m E B^0 &&
+ git tag E
+ )
+'
+
+test_expect_failure 'check submodule add/add' '
+ (
+ cd submodule-add-add &&
+
+ git checkout D^0 &&
+
+ test_must_fail git merge -s recursive E^0 &&
+
+ 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 = 1 out
+ )
+'
+
+#
+# criss-cross with conflicting entry types:
+#
+# B D
+# o---o
+# / \ / \
+# A o X ? F
+# \ / \ /
+# o---o
+# C E
+#
+# Commit A: nothing of note
+# Commit B: introduce submodule 'path'
+# Commit C: introduce symlink 'path'
+# Commit D: merge B&C, resolving in favor of B
+# Commit E: merge B&C, resolving in favor of C
+#
+# This is an obvious add/add conflict for 'path'. Can git detect it?
+
+test_expect_success 'setup conflicting entry types (submodule vs symlink)' '
+ test_create_repo submodule-symlink-add-add &&
+ (
+ cd submodule-symlink-add-add &&
+
+ test_create_repo path &&
+ (
+ cd path &&
+ touch file-B &&
+ git add file-B &&
+ git commit -m B &&
+ git tag B
+ ) &&
+
+ touch irrelevant-file &&
+ git add irrelevant-file &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ git -C path reset --hard B &&
+ git add path &&
+ git commit -m B &&
+
+ git checkout -b C A &&
+ rm -rf path/ &&
+ test_ln_s_add irrelevant-file path &&
+ git commit -m C &&
+
+ git checkout -q B^0 &&
+ git merge -s ours -m D C^0 &&
+ git tag D &&
+
+ git checkout -q C^0 &&
+ git merge -s ours -m E B^0 &&
+ git tag E
+ )
+'
+
+test_expect_failure 'check conflicting entry types (submodule vs symlink)' '
+ (
+ cd submodule-symlink-add-add &&
+
+ git checkout D^0 &&
+
+ test_must_fail git merge -s recursive E^0 &&
+
+ 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 = 1 out
+ )
+'
+
+#
+# criss-cross with regular files that have conflicting modes:
+#
+# B D
+# o---o
+# / \ / \
+# A o X ? F
+# \ / \ /
+# o---o
+# C E
+#
+# Commit A: nothing of note
+# Commit B: introduce file source_me.bash, not executable
+# Commit C: introduce file source_me.bash, executable
+# Commit D: merge B&C, resolving in favor of B
+# Commit E: merge B&C, resolving in favor of C
+#
+# This is an obvious add/add mode conflict. Can git detect it?
+
+test_expect_success 'setup conflicting modes for regular file' '
+ test_create_repo regular-file-mode-conflict &&
+ (
+ cd regular-file-mode-conflict &&
+
+ touch irrelevant-file &&
+ git add irrelevant-file &&
+ git commit -m A &&
+ git tag A &&
+
+ git checkout -b B A &&
+ echo "command_to_run" >source_me.bash &&
+ git add source_me.bash &&
+ git commit -m B &&
+
+ git checkout -b C A &&
+ echo "command_to_run" >source_me.bash &&
+ git add source_me.bash &&
+ test_chmod +x source_me.bash &&
+ git commit -m C &&
+
+ git checkout -q B^0 &&
+ git merge -s ours -m D C^0 &&
+ git tag D &&
+
+ git checkout -q C^0 &&
+ git merge -s ours -m E B^0 &&
+ git tag E
+ )
+'
+
+test_expect_failure 'check conflicting modes for regular file' '
+ (
+ cd regular-file-mode-conflict &&
+
+ git checkout D^0 &&
+
+ test_must_fail git merge -s recursive E^0 &&
+
+ 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 = 1 out
+ )
+'
+
test_done