Subject: Re: [PATCH 1/2] t1015: demonstrate directory/file conflict recovery failures

From: Eric Sunshine <[email-masked]>
Date: Wed, 11 Jul 2018 05:21:26 -0400

On Tue, Jul 10, 2018 at 10:18:33PM -0700, Elijah Newren wrote:
> Several "recovery" commands outright fail or do not fully recover
> when directory-file conflicts are present.  This includes:
>   * git read-tree --reset HEAD
>   * git am --skip
>   * git am --abort
>   * git merge --abort
>   * git reset --hard
> 
> Add testcases documenting these shortcomings.
> 
> Signed-off-by: Elijah Newren <[email-masked]>
> ---
> diff --git a/t/t1015-read-index-unmerged.sh b/t/t1015-read-index-unmerged.sh
> @@ -0,0 +1,123 @@
> +test_expect_success 'setup modify/delete + directory/file conflict' '
> +	test_create_repo df_plus_modify_delete &&
> +	(
> +		cd df_plus_modify_delete &&
> +
> +		printf "a\nb\nc\nd\ne\nf\ng\nh\n" >letters &&

test_write_lines a b c d e f g h >letters &&

> +		git add letters &&
> +		git commit -m initial &&
> +
> +		git checkout -b modify &&
> +		# Throw in letters.txt for sorting order fun
> +		# ("letters.txt" sorts between "letters" and "letters/file")
> +		echo i >>letters &&
> +		echo "version 2" >letters.txt &&
> +		git add letters letters.txt &&
> +		git commit -m modified &&
> +
> +		git checkout -b delete HEAD^ &&
> +		git rm letters &&
> +		mkdir letters &&
> +		>letters/file &&
> +		echo "version 1" >letters.txt &&
> +		git add letters letters.txt &&
> +		git commit -m deleted
> +	)
> +'
> +
> +test_expect_failure 'read-tree --reset cleans unmerged entries' '
> +	test_when_finished "git -C df_plus_modify_delete clean -f" &&
> +	test_when_finished "git -C df_plus_modify_delete reset --hard" &&
> +	(
> +		cd df_plus_modify_delete &&
> +		...
> +	)
> +'

I wonder how much value these distinct repositories add over not using
them:

--- >8 ---
#!/bin/sh

test_description='Test various callers of read_index_unmerged'
. ./test-lib.sh

test_expect_success 'setup modify/delete + directory/file conflict' '
	test_write_lines a b c d e f g h >letters &&
	git add letters &&
	git commit -m initial &&

	git checkout -b modify &&
	# Throw in letters.txt for sorting order fun
	# ("letters.txt" sorts between "letters" and "letters/file")
	echo i >>letters &&
	echo "version 2" >letters.txt &&
	git add letters letters.txt &&
	git commit -m modified &&

	git checkout -b delete HEAD^ &&
	git rm letters &&
	mkdir letters &&
	>letters/file &&
	echo "version 1" >letters.txt &&
	git add letters letters.txt &&
	git commit -m deleted
'

test_expect_failure 'read-tree --reset cleans unmerged entries' '
	test_when_finished "git clean -f" &&
	test_when_finished "git reset --hard" &&

	git checkout delete^0 &&
	test_must_fail git merge modify &&

	git read-tree --reset HEAD &&
	git ls-files -u >conflicts &&
	test_must_be_empty conflicts
'

test_expect_failure 'One reset --hard cleans unmerged entries' '
	test_when_finished "git clean -f" &&
	test_when_finished "git reset --hard" &&

	git checkout delete^0 &&
	test_must_fail git merge modify &&

	git reset --hard &&
	test_path_is_missing .git/MERGE_HEAD &&
	git ls-files -u >conflicts &&
	test_must_be_empty conflicts
'

test_expect_success 'setup directory/file conflict + simple edit/edit' '
	test_seq 1 10 >numbers &&
	git add numbers &&
	git commit -m initial &&

	git checkout -b d-edit &&
	mkdir foo &&
	echo content >foo/bar &&
	git add foo &&
	echo 11 >>numbers &&
	git add numbers &&
	git commit -m "directory and edit" &&

	git checkout -b f-edit d-edit^1 &&
	echo content >foo &&
	git add foo &&
	echo eleven >>numbers &&
	git add numbers &&
	git commit -m "file and edit"
'

test_expect_failure 'git merge --abort succeeds despite D/F conflict' '
	test_when_finished "git clean -f" &&
	test_when_finished "git reset --hard" &&

	git checkout f-edit^0 &&
	test_must_fail git merge d-edit^0 &&

	git merge --abort &&
	test_path_is_missing .git/MERGE_HEAD &&
	git ls-files -u >conflicts &&
	test_must_be_empty conflicts
'

test_expect_failure 'git am --skip succeeds despite D/F conflict' '
	test_when_finished "git clean -f" &&
	test_when_finished "git reset --hard" &&

	git checkout f-edit^0 &&
	git format-patch -1 d-edit &&
	test_must_fail git am -3 0001*.patch &&

	git am --skip &&
	test_path_is_missing .git/rebase-apply &&
	git ls-files -u >conflicts &&
	test_must_be_empty conflicts
'

test_done
--- >8 ---