#!/bin/sh

test_description="recursive merge corner cases w/ renames but not criss-crosses"
# t6036 has corner cases that involve both criss-cross merges and renames

. ./test-lib.sh

test_expect_success 'setup rename/delete + untracked file' '
        echo "A pretty inscription" >ring &&
        git add ring &&
        test_tick &&
        git commit -m beginning &&

        git branch people &&
        git checkout -b rename-the-ring &&
        git mv ring one-ring-to-rule-them-all &&
        test_tick &&
        git commit -m fullname &&

        git checkout people &&
        git rm ring &&
        echo gollum >owner &&
        git add owner &&
        test_tick &&
        git commit -m track-people-instead-of-objects &&
        echo "Myyy PRECIOUSSS" >ring
'

test_expect_failure "Does git preserve Gollum's precious artifact?" '
        test_must_fail git merge -s recursive rename-the-ring &&

        # Make sure git did not delete an untracked file
        test -f ring
'

# Testcase setup for rename/modify/add-source:
#   Commit A: new file: a
#   Commit B: modify a slightly
#   Commit C: rename a->b, add completely different a
#
# We should be able to merge B & C cleanly

test_expect_success 'setup rename/modify/add-source conflict' '
        git rm -rf . &&
        git clean -fdqx &&
        rm -rf .git &&
        git init &&

        printf "1\n2\n3\n4\n5\n6\n7\n" >a &&
        git add a &&
        git commit -m A &&
        git tag A &&

        git checkout -b B A &&
        echo 8 >>a &&
        git add a &&
        git commit -m B &&

        git checkout -b C A &&
        git mv a b &&
        echo something completely different >a &&
        git add a &&
        git commit -m C
'

test_expect_failure 'rename/modify/add-source conflict resolvable' '
        git checkout B^0 &&

        git merge -s recursive C^0 &&

        test $(git rev-parse B:a) = $(git rev-parse b) &&
        test $(git rev-parse C:a) = $(git rev-parse a)
'

test_expect_success 'setup resolvable conflict missed if rename missed' '
        git rm -rf . &&
        git clean -fdqx &&
        rm -rf .git &&
        git init &&

        printf "1\n2\n3\n4\n5\n" >a &&
        echo foo >b &&
        git add a b &&
        git commit -m A &&
        git tag A &&

        git checkout -b B A &&
        git mv a c &&
        echo "Completely different content" >a &&
        git add a &&
        git commit -m B &&

        git checkout -b C A &&
        echo 6 >>a &&
        git add a &&
        git commit -m C
'

test_expect_failure 'conflict caused if rename not detected' '
        git checkout -q C^0 &&
        git merge -s recursive B^0 &&

        test 3 -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 6 -eq $(wc -l < c) &&
        test $(git rev-parse HEAD:a) = $(git rev-parse B:a) &&
        test $(git rev-parse HEAD:b) = $(git rev-parse A:b)
'

test_expect_success 'setup conflict resolved wrong if rename missed' '
        git reset --hard &&
        git clean -f &&

        git checkout -b D A &&
        echo 7 >>a &&
        git add a &&
        git mv a c &&
        echo "Completely different content" >a &&
        git add a &&
        git commit -m D &&

        git checkout -b E A &&
        git rm a &&
        echo "Completely different content" >>a &&
        git add a &&
        git commit -m E
'

test_expect_failure 'missed conflict if rename not detected' '
        git checkout -q E^0 &&
        test_must_fail git merge -s recursive D^0
'

# Tests for undetected rename/add-source causing a file to erroneously be
# deleted (and for mishandled rename/rename(1to1) causing the same issue).
#
# This test uses a rename/rename(1to1)+add-source conflict (1to1 means the
# same file is renamed on both sides to the same thing; it should trigger
# the 1to2 logic, which it would do if the add-source didn't cause issues
# for git's rename detection):
#   Commit A: new file: a
#   Commit B: rename a->b
#   Commit C: rename a->b, add unrelated a

test_expect_success 'setup undetected rename/add-source causes data loss' '
        git rm -rf . &&
        git clean -fdqx &&
        rm -rf .git &&
        git init &&

        printf "1\n2\n3\n4\n5\n" >a &&
        git add a &&
        git commit -m A &&
        git tag A &&

        git checkout -b B A &&
        git mv a b &&
        git commit -m B &&

        git checkout -b C A &&
        git mv a b &&
        echo foobar >a &&
        git add a &&
        git commit -m C
'

test_expect_failure 'detect rename/add-source and preserve all data' '
        git checkout B^0 &&

        git merge -s recursive C^0 &&

        test 2 -eq $(git ls-files -s | wc -l) &&
        test 2 -eq $(git ls-files -u | wc -l) &&
        test 0 -eq $(git ls-files -o | wc -l) &&

        test -f a &&
        test -f b &&

        test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
        test $(git rev-parse HEAD:a) = $(git rev-parse C:a)
'

test_expect_failure 'detect rename/add-source and preserve all data, merge other way' '
        git checkout C^0 &&

        git merge -s recursive B^0 &&

        test 2 -eq $(git ls-files -s | wc -l) &&
        test 2 -eq $(git ls-files -u | wc -l) &&
        test 0 -eq $(git ls-files -o | wc -l) &&

        test -f a &&
        test -f b &&

        test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
        test $(git rev-parse HEAD:a) = $(git rev-parse C:a)
'

test_done