new file mode 100755
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+#!/bin/sh
+
+test_description='Test handling of overwriting untracked files'
+
+. ./test-lib.sh
+
+test_setup_reset () {
+ git init reset_$1 &&
+ (
+ cd reset_$1 &&
+ test_commit init &&
+
+ git branch stable &&
+ git branch work &&
+
+ git checkout work &&
+ test_commit foo &&
+
+ git checkout stable
+ )
+}
+
+test_expect_success 'reset --hard will nuke untracked files/dirs' '
+ test_setup_reset hard &&
+ (
+ cd reset_hard &&
+ git ls-tree -r stable &&
+ git log --all --name-status --oneline &&
+ git ls-tree -r work &&
+
+ mkdir foo.t &&
+ echo precious >foo.t/file &&
+ echo foo >expect &&
+
+ git reset --hard work &&
+
+ # check that untracked directory foo.t/ was nuked
+ test_path_is_file foo.t &&
+ test_cmp expect foo.t
+ )
+'
+
+test_expect_success 'reset --merge will preserve untracked files/dirs' '
+ test_setup_reset merge &&
+ (
+ cd reset_merge &&
+
+ mkdir foo.t &&
+ echo precious >foo.t/file &&
+ cp foo.t/file expect &&
+
+ test_must_fail git reset --merge work 2>error &&
+ test_cmp expect foo.t/file &&
+ grep "Updating .foo.t. would lose untracked files" error
+ )
+'
+
+test_expect_success 'reset --keep will preserve untracked files/dirs' '
+ test_setup_reset keep &&
+ (
+ cd reset_keep &&
+
+ mkdir foo.t &&
+ echo precious >foo.t/file &&
+ cp foo.t/file expect &&
+
+ test_must_fail git reset --merge work 2>error &&
+ test_cmp expect foo.t/file &&
+ grep "Updating.*foo.t.*would lose untracked files" error
+ )
+'
+
+test_setup_checkout_m () {
+ git init checkout &&
+ (
+ cd checkout &&
+ test_commit init &&
+
+ test_write_lines file has some >filler &&
+ git add filler &&
+ git commit -m filler &&
+
+ git branch stable &&
+
+ git switch -c work &&
+ echo stuff >notes.txt &&
+ test_write_lines file has some words >filler &&
+ git add notes.txt filler &&
+ git commit -m filler &&
+
+ git checkout stable
+ )
+}
+
+test_expect_failure 'checkout -m does not nuke untracked file' '
+ test_setup_checkout_m &&
+ (
+ cd checkout &&
+
+ # Tweak filler
+ test_write_lines this file has some >filler &&
+ # Make an untracked file, save its contents in "expect"
+ echo precious >notes.txt &&
+ cp notes.txt expect &&
+
+ test_must_fail git checkout -m work &&
+ test_cmp expect notes.txt
+ )
+'
+
+test_setup_sequencing () {
+ git init sequencing_$1 &&
+ (
+ cd sequencing_$1 &&
+ test_commit init &&
+
+ test_write_lines this file has some words >filler &&
+ git add filler &&
+ git commit -m filler &&
+
+ mkdir -p foo/bar &&
+ test_commit foo/bar/baz &&
+
+ git branch simple &&
+ git branch fooey &&
+
+ git checkout fooey &&
+ git rm foo/bar/baz.t &&
+ echo stuff >>filler &&
+ git add -u &&
+ git commit -m "changes" &&
+
+ git checkout simple &&
+ echo items >>filler &&
+ echo newstuff >>newfile &&
+ git add filler newfile &&
+ git commit -m another
+ )
+}
+
+test_expect_failure 'git rebase --abort and untracked files' '
+ test_setup_sequencing rebase_abort_and_untracked &&
+ (
+ cd sequencing_rebase_abort_and_untracked &&
+ git checkout fooey &&
+ test_must_fail git rebase simple &&
+
+ cat init.t &&
+ git rm init.t &&
+ echo precious >init.t &&
+ cp init.t expect &&
+ git status --porcelain &&
+ test_must_fail git rebase --abort &&
+ test_cmp expect init.t
+ )
+'
+
+test_expect_failure 'git rebase fast forwarding and untracked files' '
+ test_setup_sequencing rebase_fast_forward_and_untracked &&
+ (
+ cd sequencing_rebase_fast_forward_and_untracked &&
+ git checkout init &&
+ echo precious >filler &&
+ cp filler expect &&
+ test_must_fail git rebase init simple &&
+ test_cmp expect filler
+ )
+'
+
+test_expect_failure 'git rebase --autostash and untracked files' '
+ test_setup_sequencing rebase_autostash_and_untracked &&
+ (
+ cd sequencing_rebase_autostash_and_untracked &&
+ git checkout simple &&
+ git rm filler &&
+ mkdir filler &&
+ echo precious >filler/file &&
+ cp filler/file expect &&
+ git rebase --autostash init &&
+ test_path_is_file filler/file
+ )
+'
+
+test_expect_failure 'git stash and untracked files' '
+ test_setup_sequencing stash_and_untracked_files &&
+ (
+ cd sequencing_stash_and_untracked_files &&
+ git checkout simple &&
+ git rm filler &&
+ mkdir filler &&
+ echo precious >filler/file &&
+ cp filler/file expect &&
+ git status --porcelain &&
+ git stash push &&
+ git status --porcelain &&
+ test_path_is_file filler/file
+ )
+'
+
+test_expect_failure 'git am --abort and untracked dir vs. unmerged file' '
+ test_setup_sequencing am_abort_and_untracked &&
+ (
+ cd sequencing_am_abort_and_untracked &&
+ git format-patch -1 --stdout fooey >changes.mbox &&
+ test_must_fail git am --3way changes.mbox &&
+
+ # Delete the conflicted file; we will stage and commit it later
+ rm filler &&
+
+ # Put an unrelated untracked directory there
+ mkdir filler &&
+ echo foo >filler/file1 &&
+ echo bar >filler/file2 &&
+
+ test_must_fail git am --abort 2>errors &&
+ test_path_is_dir filler &&
+ grep "Updating .filler. would lose untracked files in it" errors
+ )
+'
+
+test_expect_failure 'git am --skip and untracked dir vs deleted file' '
+ test_setup_sequencing am_skip_and_untracked &&
+ (
+ cd sequencing_am_skip_and_untracked &&
+ git checkout fooey &&
+ git format-patch -1 --stdout simple >changes.mbox &&
+ test_must_fail git am --3way changes.mbox &&
+
+ # Delete newfile
+ rm newfile &&
+
+ # Put an unrelated untracked directory there
+ mkdir newfile &&
+ echo foo >newfile/file1 &&
+ echo bar >newfile/file2 &&
+
+ # Change our mind about resolutions, just skip this patch
+ test_must_fail git am --skip 2>errors &&
+ test_path_is_dir newfile &&
+ grep "Updating .newfile. would lose untracked files in it" errors
+ )
+'
+
+test_done